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

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2004 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 net.sourceforge.phpdt.core.IJavaElement;
  14 import net.sourceforge.phpdt.core.IJavaElementDelta;
  15 import net.sourceforge.phpdt.core.JavaModelException;
  16
  17 /**
  18  * Discards a working copy (decrement its use count and remove its working copy
  19  * info if the use count is 0) and signal its removal through a delta.
  20  */
  21 public class DiscardWorkingCopyOperation extends JavaModelOperation {
  22
  23         public DiscardWorkingCopyOperation(IJavaElement workingCopy) {
  24                 super(new IJavaElement[] { workingCopy });
  25         }
  26
  27         protected void executeOperation() throws JavaModelException {
  28                 CompilationUnit workingCopy = getWorkingCopy();
  29
  30                 int useCount = JavaModelManager.getJavaModelManager()
  31                                 .discardPerWorkingCopyInfo(workingCopy);
  32                 if (useCount == 0) {
  33                         if (!workingCopy.isPrimary()) {
  34                                 // report removed java delta for a non-primary working copy
  35                                 JavaElementDelta delta = new JavaElementDelta(this
  36                                                 .getJavaModel());
  37                                 delta.removed(workingCopy);
  38                                 addDelta(delta);
  39                                 removeReconcileDelta(workingCopy);
  40                         } else {
  41                                 if (workingCopy.getResource().isAccessible()) {
  42                                         // report a F_PRIMARY_WORKING_COPY change delta for a
  43                                         // primary working copy
  44                                         JavaElementDelta delta = new JavaElementDelta(this
  45                                                         .getJavaModel());
  46                                         delta.changed(workingCopy,
  47                                                         IJavaElementDelta.F_PRIMARY_WORKING_COPY);
  48                                         addDelta(delta);
  49                                 } else {
  50                                         // report a REMOVED delta
  51                                         JavaElementDelta delta = new JavaElementDelta(this
  52                                                         .getJavaModel());
  53                                         delta.removed(workingCopy,
  54                                                         IJavaElementDelta.F_PRIMARY_WORKING_COPY);
  55                                         addDelta(delta);
  56                                 }
  57                         }
  58                 }
  59         }
  60
  61         /**
  62          * Returns the working copy this operation is working on.
  63          */
  64         protected CompilationUnit getWorkingCopy() {
  65                 return (CompilationUnit) getElementToProcess();
  66         }
  67
  68         /**
  69          * @see JavaModelOperation#isReadOnly
  70          */
  71         public boolean isReadOnly() {
  72                 return true;
  73         }
  74 }