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From sbaill...@apache.org
Subject cvs commit: jakarta-ant/proposal/sandbox/junit/src/main/org/apache/tools/ant/taskdefs/optional/junit CompoundEnumeration.java
Date Sun, 27 Jan 2002 14:07:18 GMT
sbailliez    02/01/27 06:07:18

  Added:       proposal/sandbox/junit/src/main/org/apache/tools/ant/taskdefs/optional/junit
                        CompoundEnumeration.java
  Log:
  Extract the classes from Enumerations.
  
  Revision  Changes    Path
  1.1                  jakarta-ant/proposal/sandbox/junit/src/main/org/apache/tools/ant/taskdefs/optional/junit/CompoundEnumeration.java
  
  Index: CompoundEnumeration.java
  ===================================================================
  /*
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2002 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 acknowlegement:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowlegement may appear in the software itself,
   *    if and wherever such third-party acknowlegements normally appear.
   *
   * 4. The names "The Jakarta Project", "Ant", 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 Group.
   *
   * 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.tools.ant.taskdefs.optional.junit;
  
  import java.util.Enumeration;
  import java.util.NoSuchElementException;
  
  /**
   * Convenient enumeration over an array of enumeration. For example:
   * <pre>
   * Enumeration e1 = v1.elements();
   * while (e1.hasMoreElements()){
   *    // do something
   * }
   * Enumeration e2 = v2.elements();
   * while (e2.hasMoreElements()){
   *    // do the same thing
   * }
   * </pre>
   * can be written as:
   * <pre>
   * Enumeration[] enums = { v1.elements(), v2.elements() };
   * Enumeration e = Enumerations.fromCompound(enums);
   * while (e.hasMoreElements()){
   *    // do something
   * }
   * </pre>
   * Note that the enumeration will skip null elements in the array. The following is
   * thus possible:
   * <pre>
   * Enumeration[] enums = { v1.elements(), null, v2.elements() }; // a null enumeration in
the array
   * Enumeration e = Enumerations.fromCompound(enums);
   * while (e.hasMoreElements()){
   *    // do something
   * }
   * </pre>
   * @author <a href="mailto:sbailliez@imediation.com">Stephane Bailliez</a>
   */
   class CompoundEnumeration implements Enumeration {
  
          /** enumeration array */
          private Enumeration[] enumArray;
  
          /** index in the enums array */
          private int index = 0;
  
      public CompoundEnumeration(Enumeration[] enumarray) {
                  this.enumArray = enumarray;
      }
  
          /**
           * Tests if this enumeration contains more elements.
           *
           * @return  <code>true</code> if and only if this enumeration object
           *           contains at least one more element to provide;
           *          <code>false</code> otherwise.
           */
      public boolean hasMoreElements() {
                  while (index < enumArray.length) {
                          if (enumArray[index] != null && enumArray[index].hasMoreElements())
{
                                  return true;
                          }
                          index++;
                  }
                  return false;
      }
  
          /**
           * Returns the next element of this enumeration if this enumeration
           * object has at least one more element to provide.
           *
           * @return     the next element of this enumeration.
           * @throws  NoSuchElementException  if no more elements exist.
           */
      public Object nextElement() throws NoSuchElementException {
                  if ( hasMoreElements() ) {
                          return enumArray[index].nextElement();
                  }
                  throw new NoSuchElementException();
      }
  }
  
  
  

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