net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/core/DestroyWorkingCopyOperation.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpdt.internal.core;
  12
  13 import java.util.Map;
  14
  15 import net.sourceforge.phpdt.core.IJavaElement;
  16 import net.sourceforge.phpdt.core.JavaModelException;
  17
  18
  19 /**
  20  * Destroys a working copy (remove it from its cache if it is shared)
  21  * and signal its removal through a delta.
  22  */
  23 public class DestroyWorkingCopyOperation extends JavaModelOperation {
  24
  25         public DestroyWorkingCopyOperation(IJavaElement workingCopy) {
  26                 super(new IJavaElement[] {workingCopy});
  27         }
  28         /**
  29          * @exception JavaModelException if setting the source
  30          *      of the original compilation unit fails
  31          */
  32         protected void executeOperation() throws JavaModelException {
  33                 WorkingCopy workingCopy = getWorkingCopy();
  34                 workingCopy.close();
  35
  36                 // if original element is not on classpath flush it from the cache
  37                 IJavaElement originalElement = workingCopy.getOriginalElement();
  38                 if (!workingCopy.getParent().exists()) {
  39                         ((CompilationUnit)originalElement).close();
  40                 }
  41
  42                 // remove working copy from the cache if it is shared
  43                 JavaModelManager manager = JavaModelManager.getJavaModelManager();
  44
  45                 // In order to be shared, working copies have to denote the same compilation unit
  46                 // AND use the same buffer factory.
  47                 // Assuming there is a little set of buffer factories, then use a 2 level Map cache.
  48                 Map sharedWorkingCopies = manager.sharedWorkingCopies;
  49
  50                 Map perFactoryWorkingCopies = (Map) sharedWorkingCopies.get(workingCopy.bufferFactory);
  51                 if (perFactoryWorkingCopies != null){
  52                         if (perFactoryWorkingCopies.remove(originalElement) != null
  53                                         && CompilationUnit.SHARED_WC_VERBOSE) {
  54                                 System.out.println("Destroying shared working copy " + workingCopy.toStringWithAncestors());//$NON-NLS-1$
  55                         }
  56                 }
  57
  58                 // report removed java delta
  59                 JavaElementDelta delta = new JavaElementDelta(this.getJavaModel());
  60                 delta.removed(workingCopy);
  61                 addDelta(delta);
  62                 removeReconcileDelta(workingCopy);
  63         }
  64         /**
  65          * Returns the working copy this operation is working on.
  66          */
  67         protected WorkingCopy getWorkingCopy() {
  68                 return (WorkingCopy)getElementToProcess();
  69         }
  70         /**
  71          * @see JavaModelOperation#isReadOnly
  72          */
  73         public boolean isReadOnly() {
  74                 return true;
  75         }
  76 }