package org.apache.commons.jelly.tags.ant;
   
   /*
    * Copyright 1999-2001,2004 The Apache Software Foundation.
    * 
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    * 
   *      http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  import java.io.File;
  import java.util.Hashtable;
  
  import org.apache.tools.ant.BuildException;
  import org.apache.tools.ant.Project;
  import org.apache.tools.ant.ProjectHelper;
  
  /*** A subclass of an ant <code>Project</code> which allows
   *  installation of delegators for particular functions.
   *
   *  <p>
   *  Current delegation points include:
   *
   *  <ul>
   *    <li>Properties</li>
   *  </ul>
   *
   *  @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
   */
  public class GrantProject extends Project {
  
      // ------------------------------------------------------------
      //     Instance members
      // ------------------------------------------------------------
  
      /*** Properties delegate. */
      private PropsHandler propsHandler;
  
      // ------------------------------------------------------------
      //     Constructors
      // ------------------------------------------------------------
  
      /*** Construct a new, empty <code>GrantProject</code>.
       *
       *  <p>
       *  Immediately after initialization, a <code>GrantProject</code>
       *  delegates <b>all</b> calls to the normal ant <code>Project</code>
       *  super class.   Only after installing delegators will custom
       *  behavious be acheived.
       *  </p>
       */
      public GrantProject() {
          this.propsHandler = null;
      }
  
      // ------------------------------------------------------------
      //     Instance methods
      // ------------------------------------------------------------
  
      /*** Install a <code>PropsHandler</code> delegate.
       *
       *  @param propsHandler The <code>PropsHandler</code> to install,
       *         or <code>null</code> to remove any currently installed
       *         <code>PropsHandler</code>.
       */
      public void setPropsHandler(PropsHandler propsHandler) {
          this.propsHandler = propsHandler;
      }
  
      /*** Retrieve the currently installed <code>PropsHandler</code>.
       *
       *  @return The currently installed <code>PropsHandler</code>,
       *          or <code>null</code> if no <code>PropsHandler</code>
       *          had yet to be installed.
       */
      public PropsHandler getPropsHandler() {
          return this.propsHandler;
      }
  
      // ------------------------------------------------------------
      //     org.apache.tools.ant.Project implementation
      // ------------------------------------------------------------
  
      // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
      //         properties delegators:
      //
      //         If a PropsHandler is not installed, delegate
      //         up the hierarchy to the ant.Project parent
      //         class.  Otherwise, delegate outwards using
      //         the PropsHandler.
      // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
 
     public String replaceProperties(String value) throws BuildException {
         return ProjectHelper.replaceProperties(this, value, getProperties());
     }
 
     public synchronized void setProperty(String key, String value) {
         if (this.propsHandler == null) {
             super.setProperty(key, value);
         }
         else {
             this.propsHandler.setProperty(key, value);
         }
     }
 
     public synchronized void setUserProperty(String key, String value) {
         if (this.propsHandler == null) {
             super.setUserProperty(key, value);
         }
         else {
             this.propsHandler.setUserProperty(key, value);
         }
     }
 
     public synchronized void setNewProperty(String key, String value) {
         if (this.propsHandler == null) {
             super.setNewProperty(key, value);
         }
         else {
             this.propsHandler.setNewProperty(key, value);
         }
     }
 
     public void setInheritedProperty(String key, String value) {
         if (this.propsHandler == null) {
             super.setInheritedProperty(key, value);
         }
         else {
             this.propsHandler.setInheritedProperty(key, value);
         }
     }
 
     public String getProperty(String key) {
         if (this.propsHandler == null) {
             return super.getProperty(key);
         }
 
         return this.propsHandler.getProperty(key);
     }
 
     public String getUserProperty(String key) {
         if (this.propsHandler == null) {
             return super.getUserProperty(key);
         }
 
         return this.propsHandler.getUserProperty(key);
     }
 
     public Hashtable getUserProperties() {
         if (this.propsHandler == null) {
             return super.getUserProperties();
         }
 
         return this.propsHandler.getUserProperties();
     }
 
     public Hashtable getProperties() {
         if (this.propsHandler == null) {
             return super.getProperties();
         }
 
         return this.propsHandler.getProperties();
     }
 
     public void copyUserProperties(Project other) {
         if (this.propsHandler == null) {
             super.copyUserProperties(other);
         }
         else {
             this.propsHandler.copyUserProperties(other);
         }
     }
 
     public void copyInheritedProperties(Project other) {
         if (this.propsHandler == null) {
             super.copyInheritedProperties(other);
         }
         else {
             this.propsHandler.copyInheritedProperties(other);
         }
     }
 
     public void setSystemProperties() {
         if (this.propsHandler == null) {
             super.setSystemProperties();
         }
         else {
             this.propsHandler.setSystemProperties();
         }
     }
 
     public void setJavaVersionProperty() throws BuildException {
         // Always call the super, as they do some sanity checks
         super.setJavaVersionProperty();
 
         if (this.propsHandler != null) {
             this.propsHandler.setJavaVersionProperty();
         }
     }
 
     public void setBaseDir(File baseDir) throws BuildException {
         super.setBaseDir(baseDir);
 
         if (this.propsHandler != null) {
             this.propsHandler.setPropertyIfUndefinedByUser(
                 "basedir",
                 baseDir.getPath());
         }
     }
 }