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From scolebou...@apache.org
Subject cvs commit: jakarta-commons/collections/src/java/org/apache/commons/collections/decorators UnmodifiableSet.java SynchronizedSet.java UnmodifiableSortedSet.java AbstractSetDecorator.java SynchronizedSortedSet.java TypedSortedSet.java PredicatedSortedSet.java TypedSet.java PredicatedSet.java AbstractSortedSetDecorator.java
Date Wed, 07 May 2003 11:19:46 GMT
scolebourne    2003/05/07 04:19:46

  Added:       collections/src/java/org/apache/commons/collections/decorators
                        UnmodifiableSet.java SynchronizedSet.java
                        UnmodifiableSortedSet.java
                        AbstractSetDecorator.java
                        SynchronizedSortedSet.java TypedSortedSet.java
                        PredicatedSortedSet.java TypedSet.java
                        PredicatedSet.java AbstractSortedSetDecorator.java
  Log:
  Add Set and SortedSet collection decorators
  
  Revision  Changes    Path
  1.1                  jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/UnmodifiableSet.java
  
  Index: UnmodifiableSet.java
  ===================================================================
  /*
   * $Header: /home/cvs/jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/UnmodifiableSet.java,v 1.1 2003/05/07 11:19:46 scolebourne Exp $
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2003 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "The Jakarta Project", "Commons", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  package org.apache.commons.collections.decorators;
  
  import java.util.Set;
  
  /**
   * <code>UnmodifiableSet</code> decorates another <code>Set</code> to
   * ensure it can't be altered.
   *
   * @since Commons Collections 3.0
   * @version $Revision: 1.1 $ $Date: 2003/05/07 11:19:46 $
   * 
   * @author Stephen Colebourne
   */
  public class UnmodifiableSet extends UnmodifiableCollection implements Set {
  
      /**
       * Factory method to create an unmodifiable set.
       * 
       * @param set  the set to decorate, must not be null
       * @throws IllegalArgumentException if set is null
       */
      public static Set decorate(Set set) {
          return new UnmodifiableSet(set);
      }
  
      /**
       * Constructor that wraps (not copies).
       * 
       * @param set  the set to decorate, must not be null
       * @throws IllegalArgumentException if set is null
       */
      protected UnmodifiableSet(Set set) {
          super(set);
      }
  
      /**
       * Gets the set being decorated.
       * 
       * @return the decorated set
       */
      protected Set getSet() {
          return (Set) getCollection();
      }
  
  }
  
  
  
  1.1                  jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/SynchronizedSet.java
  
  Index: SynchronizedSet.java
  ===================================================================
  /*
   * $Header: /home/cvs/jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/SynchronizedSet.java,v 1.1 2003/05/07 11:19:46 scolebourne Exp $
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2003 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "The Jakarta Project", "Commons", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  package org.apache.commons.collections.decorators;
  
  import java.util.Set;
  
  /**
   * <code>SynchronizedSet</code> decorates another <code>Set</code>.
   * <p>
   * Methods are synchronized, then forwarded to the decorated set.
   *
   * @since Commons Collections 3.0
   * @version $Revision: 1.1 $ $Date: 2003/05/07 11:19:46 $
   * 
   * @author Stephen Colebourne
   */
  public class SynchronizedSet extends SynchronizedCollection implements Set {
  
      /**
       * Factory method to create a synchronized set.
       * 
       * @param set  the set to decorate, must not be null
       * @throws IllegalArgumentException if set is null
       */
      public static Set decorate(Set set) {
          return new SynchronizedSet(set);
      }
      
      /**
       * Constructor that wraps (not copies).
       * 
       * @param set  the set to decorate, must not be null
       * @throws IllegalArgumentException if set is null
       */
      protected SynchronizedSet(Set set) {
          super(set);
      }
  
      /**
       * Constructor that wraps (not copies).
       * 
       * @param set  the set to decorate, must not be null
       * @param lock  the lock object to use, must not be null
       * @throws IllegalArgumentException if set is null
       */
      protected SynchronizedSet(Set set, Object lock) {
          super(set, lock);
      }
  
      /**
       * Gets the decorated set.
       * 
       * @return the decorated set
       */
      protected Set getSet() {
          return (Set) collection;
      }
  
  }
  
  
  
  1.1                  jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/UnmodifiableSortedSet.java
  
  Index: UnmodifiableSortedSet.java
  ===================================================================
  /*
   * $Header: /home/cvs/jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/UnmodifiableSortedSet.java,v 1.1 2003/05/07 11:19:46 scolebourne Exp $
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2003 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "The Jakarta Project", "Commons", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  package org.apache.commons.collections.decorators;
  
  import java.util.Comparator;
  import java.util.SortedSet;
  
  /**
   * <code>UnmodifiableSortedSet</code> decorates another <code>SortedSet</code>
   * to ensure it can't be altered.
   *
   * @since Commons Collections 3.0
   * @version $Revision: 1.1 $ $Date: 2003/05/07 11:19:46 $
   * 
   * @author Stephen Colebourne
   */
  public class UnmodifiableSortedSet extends UnmodifiableSet implements SortedSet {
  
      /**
       * Factory method to create an unmodifiable set.
       * 
       * @param set  the set to decorate, must not be null
       * @throws IllegalArgumentException if set is null
       */
      public static SortedSet decorate(SortedSet set) {
          return new UnmodifiableSortedSet(set);
      }
  
      /**
       * Constructor that wraps (not copies).
       * 
       * @param set  the set to decorate, must not be null
       * @throws IllegalArgumentException if set is null
       */
      protected UnmodifiableSortedSet(SortedSet set) {
          super(set);
      }
  
      /**
       * Gets the set being decorated.
       * 
       * @return the decorated set
       */
      protected SortedSet getSortedSet() {
          return (SortedSet) getCollection();
      }
  
      //-----------------------------------------------------------------------
      public SortedSet subSet(Object fromElement, Object toElement) {
          SortedSet sub = getSortedSet().subSet(fromElement, toElement);
          return new UnmodifiableSortedSet(sub);
      }
  
      public SortedSet headSet(Object toElement) {
          SortedSet sub = getSortedSet().headSet(toElement);
          return new UnmodifiableSortedSet(sub);
      }
  
      public SortedSet tailSet(Object fromElement) {
          SortedSet sub = getSortedSet().tailSet(fromElement);
          return new UnmodifiableSortedSet(sub);
      }
  
      public Object first() {
          return getSortedSet().first();
      }
  
      public Object last() {
          return getSortedSet().last();
      }
  
      public Comparator comparator() {
          return getSortedSet().comparator();
      }
  
  }
  
  
  
  1.1                  jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/AbstractSetDecorator.java
  
  Index: AbstractSetDecorator.java
  ===================================================================
  /*
   * $Header: /home/cvs/jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/AbstractSetDecorator.java,v 1.1 2003/05/07 11:19:46 scolebourne Exp $
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2003 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "The Jakarta Project", "Commons", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  package org.apache.commons.collections.decorators;
  
  import java.util.Set;
  
  /**
   * <code>AbstractSetDecorator</code> decorates another <code>Set</code>.
   * <p>
   * Methods are forwarded directly to the decorated set.
   *
   * @since Commons Collections 3.0
   * @version $Revision: 1.1 $ $Date: 2003/05/07 11:19:46 $
   * 
   * @author Stephen Colebourne
   */
  public abstract class AbstractSetDecorator extends AbstractCollectionDecorator implements Set {
  
      /**
       * Constructor that wraps (not copies).
       * 
       * @param set  the set to decorate, must not be null
       * @throws IllegalArgumentException if set is null
       */
      protected AbstractSetDecorator(Set set) {
          super(set);
      }
  
      /**
       * Gets the set being decorated.
       * 
       * @return the decorated set
       */
      protected Set getSet() {
          return (Set) getCollection();
      }
  
  }
  
  
  
  1.1                  jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/SynchronizedSortedSet.java
  
  Index: SynchronizedSortedSet.java
  ===================================================================
  /*
   * $Header: /home/cvs/jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/SynchronizedSortedSet.java,v 1.1 2003/05/07 11:19:46 scolebourne Exp $
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2003 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "The Jakarta Project", "Commons", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  package org.apache.commons.collections.decorators;
  
  import java.util.Comparator;
  import java.util.SortedSet;
  
  /**
   * <code>SynchronizedSortedSet</code> decorates another <code>SortedSet</code>.
   * <p>
   * Methods are synchronized, then forwarded to the decorated set.
   *
   * @since Commons Collections 3.0
   * @version $Revision: 1.1 $ $Date: 2003/05/07 11:19:46 $
   * 
   * @author Stephen Colebourne
   */
  public class SynchronizedSortedSet extends SynchronizedCollection implements SortedSet {
  
      /**
       * Factory method to create a synchronized set.
       * 
       * @param set  the set to decorate, must not be null
       * @throws IllegalArgumentException if set is null
       */
      public static SortedSet decorate(SortedSet set) {
          return new SynchronizedSortedSet(set);
      }
      
      /**
       * Constructor that wraps (not copies).
       * 
       * @param set  the set to decorate, must not be null
       * @throws IllegalArgumentException if set is null
       */
      protected SynchronizedSortedSet(SortedSet set) {
          super(set);
      }
  
      /**
       * Constructor that wraps (not copies).
       * 
       * @param set  the set to decorate, must not be null
       * @param lock  the lock object to use, must not be null
       * @throws IllegalArgumentException if set is null
       */
      protected SynchronizedSortedSet(SortedSet set, Object lock) {
          super(set, lock);
      }
  
      /**
       * Gets the decorated set.
       * 
       * @return the decorated set
       */
      protected SortedSet getSortedSet() {
          return (SortedSet) collection;
      }
  
      //-----------------------------------------------------------------------
      public SortedSet subSet(Object fromElement, Object toElement) {
          synchronized (lock) {
              SortedSet set = getSortedSet().subSet(fromElement, toElement);
              // the lock is passed into the constructor here to ensure that the
              // subset is synchronized on the same lock as the parent
              return new SynchronizedSortedSet(set, lock);
          }
      }
  
      public SortedSet headSet(Object toElement) {
          synchronized (lock) {
              SortedSet set = getSortedSet().headSet(toElement);
              // the lock is passed into the constructor here to ensure that the
              // headset is synchronized on the same lock as the parent
              return new SynchronizedSortedSet(set, lock);
          }
      }
  
      public SortedSet tailSet(Object fromElement) {
          synchronized (lock) {
              SortedSet set = getSortedSet().tailSet(fromElement);
              // the lock is passed into the constructor here to ensure that the
              // tailset is synchronized on the same lock as the parent
              return new SynchronizedSortedSet(set, lock);
          }
      }
  
      public Object first() {
          synchronized (lock) {
              return getSortedSet().first();
          }
      }
  
      public Object last() {
          synchronized (lock) {
              return getSortedSet().last();
          }
      }
  
      public Comparator comparator() {
          synchronized (lock) {
              return getSortedSet().comparator();
          }
      }
  
  }
  
  
  
  1.1                  jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/TypedSortedSet.java
  
  Index: TypedSortedSet.java
  ===================================================================
  /*
   * $Header: /home/cvs/jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/TypedSortedSet.java,v 1.1 2003/05/07 11:19:46 scolebourne Exp $
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2003 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "The Jakarta Project", "Commons", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  package org.apache.commons.collections.decorators;
  
  import java.util.SortedSet;
  
  /**
   * <code>TypedSortedSet</code> decorates another <code>Set</code>
   * to validate that elements added are of a specific type.
   * <p>
   * The validation of additions is performed via an instanceof test against 
   * a specified <code>Class</code>. If an object cannot be addded to the
   * collection, an IllegalArgumentException is thrown.
   *
   * @since Commons Collections 3.0
   * @version $Revision: 1.1 $ $Date: 2003/05/07 11:19:46 $
   * 
   * @author Stephen Colebourne
   * @author Matthew Hawthorne
   */
  public class TypedSortedSet extends PredicatedSortedSet {
  
      /**
       * Factory method to create a typed sorted set.
       * <p>
       * If there are any elements already in the set being decorated, they
       * are validated.
       * 
       * @param set  the set to decorate, must not be null
       * @param type  the type to allow into the collection, must not be null
       * @throws IllegalArgumentException if set or type is null
       * @throws IllegalArgumentException if the set contains invalid elements
       */
      public static SortedSet decorate(SortedSet set, Class type) {
          return new TypedSortedSet(set, type);
      }
      
      /**
       * Constructor that wraps (not copies).
       * <p>
       * If there are any elements already in the collection being decorated, they
       * are validated.
       * 
       * @param set  the set to decorate, must not be null
       * @param type  the type to allow into the collection, must not be null
       * @throws IllegalArgumentException if set or type is null
       * @throws IllegalArgumentException if the set contains invalid elements
       */
      protected TypedSortedSet(SortedSet set, Class type) {
          super(set, TypedCollection.getPredicate(type));
      }
  
  }
  
  
  
  1.1                  jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/PredicatedSortedSet.java
  
  Index: PredicatedSortedSet.java
  ===================================================================
  /*
   * $Header: /home/cvs/jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/PredicatedSortedSet.java,v 1.1 2003/05/07 11:19:46 scolebourne Exp $
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2003 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "The Jakarta Project", "Commons", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  package org.apache.commons.collections.decorators;
  
  import java.util.Comparator;
  import java.util.SortedSet;
  
  import org.apache.commons.collections.Predicate;
  
  /**
   * <code>PredicatedSortedSet</code> decorates another <code>SortedSet</code>
   * to validate additions match a specified predicate.
   * <p>
   * If an object cannot be addded to the set, an IllegalArgumentException
   * is thrown.
   *
   * @since Commons Collections 3.0
   * @version $Revision: 1.1 $ $Date: 2003/05/07 11:19:46 $
   * 
   * @author Stephen Colebourne
   * @author Paul Jack
   */
  public class PredicatedSortedSet extends PredicatedSet implements SortedSet {
  
      /**
       * Factory method to create a predicated (validating) sorted set.
       * <p>
       * If there are any elements already in the set being decorated, they
       * are validated.
       * 
       * @param set  the set to decorate, must not be null
       * @param predicate  the predicate to use for validation, must not be null
       * @throws IllegalArgumentException if set or predicate is null
       * @throws IllegalArgumentException if the set contains invalid elements
       */
      public static SortedSet decorate(SortedSet set, Predicate predicate) {
          return new PredicatedSortedSet(set, predicate);
      }
  
      /**
       * Constructor that wraps (not copies).
       * <p>
       * If there are any elements already in the set being decorated, they
       * are validated.
       * 
       * @param set  the set to decorate, must not be null
       * @param predicate  the predicate to use for validation, must not be null
       * @throws IllegalArgumentException if set or predicate is null
       * @throws IllegalArgumentException if the set contains invalid elements
       */
      protected PredicatedSortedSet(SortedSet set, Predicate predicate) {
          super(set, predicate);
      }
  
      /**
       * Gets the sorted set being decorated.
       * 
       * @return the decorated sorted set
       */
      private SortedSet getSortedSet() {
          return (SortedSet) getCollection();
      }
  
      //-----------------------------------------------------------------------
      public SortedSet subSet(Object fromElement, Object toElement) {
          SortedSet sub = getSortedSet().subSet(fromElement, toElement);
          return new PredicatedSortedSet(sub, predicate);
      }
  
      public SortedSet headSet(Object toElement) {
          SortedSet sub = getSortedSet().headSet(toElement);
          return new PredicatedSortedSet(sub, predicate);
      }
  
      public SortedSet tailSet(Object fromElement) {
          SortedSet sub = getSortedSet().tailSet(fromElement);
          return new PredicatedSortedSet(sub, predicate);
      }
  
      public Object first() {
          return getSortedSet().first();
      }
  
      public Object last() {
          return getSortedSet().last();
      }
  
      public Comparator comparator() {
          return getSortedSet().comparator();
      }
  
  }
  
  
  
  1.1                  jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/TypedSet.java
  
  Index: TypedSet.java
  ===================================================================
  /*
   * $Header: /home/cvs/jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/TypedSet.java,v 1.1 2003/05/07 11:19:46 scolebourne Exp $
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2003 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "The Jakarta Project", "Commons", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  package org.apache.commons.collections.decorators;
  
  import java.util.Set;
  
  /**
   * <code>TypedSet</code> decorates another <code>Set</code>
   * to validate that elements added are of a specific type.
   * <p>
   * The validation of additions is performed via an instanceof test against 
   * a specified <code>Class</code>. If an object cannot be addded to the
   * collection, an IllegalArgumentException is thrown.
   *
   * @since Commons Collections 3.0
   * @version $Revision: 1.1 $ $Date: 2003/05/07 11:19:46 $
   * 
   * @author Stephen Colebourne
   * @author Matthew Hawthorne
   */
  public class TypedSet extends PredicatedSet {
  
      /**
       * Factory method to create a typed set.
       * <p>
       * If there are any elements already in the set being decorated, they
       * are validated.
       * 
       * @param set  the set to decorate, must not be null
       * @param type  the type to allow into the collection, must not be null
       * @throws IllegalArgumentException if set or type is null
       * @throws IllegalArgumentException if the set contains invalid elements
       */
      public static Set decorate(Set set, Class type) {
          return new TypedSet(set, type);
      }
      
      /**
       * Constructor that wraps (not copies).
       * <p>
       * If there are any elements already in the collection being decorated, they
       * are validated.
       * 
       * @param set  the set to decorate, must not be null
       * @param type  the type to allow into the collection, must not be null
       * @throws IllegalArgumentException if set or type is null
       * @throws IllegalArgumentException if the set contains invalid elements
       */
      protected TypedSet(Set set, Class type) {
          super(set, TypedCollection.getPredicate(type));
      }
  
  }
  
  
  
  1.1                  jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/PredicatedSet.java
  
  Index: PredicatedSet.java
  ===================================================================
  /*
   * $Header: /home/cvs/jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/PredicatedSet.java,v 1.1 2003/05/07 11:19:46 scolebourne Exp $
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2003 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "The Jakarta Project", "Commons", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  package org.apache.commons.collections.decorators;
  
  import java.util.Set;
  
  import org.apache.commons.collections.Predicate;
  
  /**
   * <code>PredicatedSet</code> decorates another <code>Set</code>
   * to validate additions match a specified predicate.
   * <p>
   * If an object cannot be addded to the set, an IllegalArgumentException
   * is thrown.
   *
   * @since Commons Collections 3.0
   * @version $Revision: 1.1 $ $Date: 2003/05/07 11:19:46 $
   * 
   * @author Stephen Colebourne
   * @author Paul Jack
   */
  public class PredicatedSet extends PredicatedCollection implements Set {
  
      /**
       * Factory method to create a predicated (validating) set.
       * <p>
       * If there are any elements already in the set being decorated, they
       * are validated.
       * 
       * @param set  the set to decorate, must not be null
       * @param predicate  the predicate to use for validation, must not be null
       * @throws IllegalArgumentException if set or predicate is null
       * @throws IllegalArgumentException if the set contains invalid elements
       */
      public static Set decorate(Set set, Predicate predicate) {
          return new PredicatedSet(set, predicate);
      }
  
      /**
       * Constructor that wraps (not copies).
       * <p>
       * If there are any elements already in the set being decorated, they
       * are validated.
       * 
       * @param set  the set to decorate, must not be null
       * @param predicate  the predicate to use for validation, must not be null
       * @throws IllegalArgumentException if set or predicate is null
       * @throws IllegalArgumentException if the set contains invalid elements
       */
      protected PredicatedSet(Set set, Predicate predicate) {
          super(set, predicate);
      }
  
      /**
       * Gets the set being decorated.
       * 
       * @return the decorated set
       */
      protected Set getSet() {
          return (Set) getCollection();
      }
  
  }
  
  
  
  1.1                  jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/AbstractSortedSetDecorator.java
  
  Index: AbstractSortedSetDecorator.java
  ===================================================================
  /*
   * $Header: /home/cvs/jakarta-commons/collections/src/java/org/apache/commons/collections/decorators/AbstractSortedSetDecorator.java,v 1.1 2003/05/07 11:19:46 scolebourne Exp $
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2003 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "The Jakarta Project", "Commons", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  package org.apache.commons.collections.decorators;
  
  import java.util.Comparator;
  import java.util.Set;
  import java.util.SortedSet;
  
  /**
   * <code>AbstractSortedSetDecorator</code> decorates another <code>SortedSet</code>.
   * <p>
   * Methods are forwarded directly to the decorated set.
   *
   * @since Commons Collections 3.0
   * @version $Revision: 1.1 $ $Date: 2003/05/07 11:19:46 $
   * 
   * @author Stephen Colebourne
   */
  public abstract class AbstractSortedSetDecorator extends AbstractSetDecorator implements SortedSet {
  
      /**
       * Constructor that wraps (not copies).
       * 
       * @param set  the set to decorate, must not be null
       * @throws IllegalArgumentException if set is null
       */
      protected AbstractSortedSetDecorator(Set set) {
          super(set);
      }
  
      /**
       * Gets the sorted set being decorated.
       * 
       * @return the decorated set
       */
      protected SortedSet getSortedSet() {
          return (SortedSet) getCollection();
      }
      
      //-----------------------------------------------------------------------
      public SortedSet subSet(Object fromElement, Object toElement) {
          return getSortedSet().subSet(fromElement, toElement);
      }
  
      public SortedSet headSet(Object toElement) {
          return getSortedSet().headSet(toElement);
      }
  
      public SortedSet tailSet(Object fromElement) {
          return getSortedSet().tailSet(fromElement);
      }
  
      public Object first() {
          return getSortedSet().first();
      }
  
      public Object last() {
          return getSortedSet().last();
      }
  
      public Comparator comparator() {
          return getSortedSet().comparator();
      }
  
  }
  
  
  

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