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From cos...@apache.org
Subject cvs commit: jakarta-ant/src/main/org/apache/tools/ant/util LazyHashtable.java
Date Fri, 06 Dec 2002 23:02:30 GMT
costin      2002/12/06 15:02:30

  Added:       src/main/org/apache/tools/ant/util LazyHashtable.java
  Log:
  Added a hashtable that allows delayed initialization.
  
  In most build files you don't use _all_ tasks and types -
  and it takes few second to process all exceptions due to class not
  found ( for optional tasks ). This class will allow tasks to
  be created when needed, and will also improve the behavior
  when the main class loader is changed.
  
  Revision  Changes    Path
  1.1                  jakarta-ant/src/main/org/apache/tools/ant/util/LazyHashtable.java
  
  Index: LazyHashtable.java
  ===================================================================
  /*
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2000-2002 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.util;
  
  import java.util.Hashtable;
  import java.util.Enumeration;
  
  /** Hashtable implementation that allows delayed construction
   * of expensive objects
   *
   * All operations that need access to the full list of objects
   * will call initAll() first. Get and put are cheap.
   */
  public class LazyHashtable extends Hashtable {
      protected boolean initAllDone=false;
  
      public LazyHashtable() {
          super();
      }
  
      /** Used to be part of init. It must be done once - but
       * we delay it until we do need _all_ tasks. Otherwise we
       * just get the tasks that we need, and avoid costly init.
       */
      protected void initAll( ) {
          if( initAllDone ) return;
          initAllDone=true;
      }
  
  
      public Enumeration elements() {
          initAll();
          return super.elements();
      }
  
      public boolean isEmpty() {
          initAll();
          return super.isEmpty();
      }
  
      public int size() {
          initAll();
          return super.size();
      }
  
      public boolean contains( Object value ) {
          initAll();
          return super.contains(value );
      }
  
      public boolean containsValue( Object value ) {
          initAll();
          return super.containsValue( value );
      }
  
      public Enumeration keys() {
          initAll();
          return super.keys();
      }
  
      // XXX Unfortunately JDK1.2 adds entrySet(), keySet(), values() -
      // implementing this requires a small hack, we can add it later.
  }
  
  
  

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