case-study/jdt-before/core refactoring/org/eclipse/jdt/internal/corext/refactoring/changes/DynamicValidationStateChange.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2011 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Eclipse Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/epl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package org.eclipse.jdt.internal.corext.refactoring.changes;
  12
  13 import org.eclipse.core.runtime.CoreException;
  14 import org.eclipse.core.runtime.IProgressMonitor;
  15 import org.eclipse.core.runtime.ISafeRunnable;
  16 import org.eclipse.core.runtime.SafeRunner;
  17 import org.eclipse.core.runtime.jobs.ISchedulingRule;
  18
  19 import org.eclipse.core.resources.IWorkspaceRunnable;
  20 import org.eclipse.core.resources.ResourcesPlugin;
  21
  22 import org.eclipse.ltk.core.refactoring.Change;
  23 import org.eclipse.ltk.core.refactoring.CompositeChange;
  24 import org.eclipse.ltk.core.refactoring.RefactoringStatus;
  25
  26 import org.eclipse.jdt.core.JavaCore;
  27
  28 import org.eclipse.jdt.internal.corext.refactoring.RefactoringCoreMessages;
  29
  30 import org.eclipse.jdt.internal.ui.JavaPlugin;
  31
  32 //import org.eclipse.jdt.internal.corext.refactoring.RefactoringCoreMessages;
  33
  34 public class DynamicValidationStateChange extends CompositeChange implements WorkspaceTracker.Listener {
  35
  36         private boolean fListenerRegistered= false;
  37         private RefactoringStatus fValidationState= null;
  38         private long fTimeStamp;
  39         private ISchedulingRule fSchedulingRule;
  40
  41         // 30 minutes
  42         private static final long LIFE_TIME= 30 * 60 * 1000;
  43
  44         public DynamicValidationStateChange(Change change) {
  45                 super(change.getName());
  46                 add(change);
  47                 markAsSynthetic();
  48                 fSchedulingRule= ResourcesPlugin.getWorkspace().getRoot();
  49         }
  50
  51         public DynamicValidationStateChange(String name) {
  52                 super(name);
  53                 markAsSynthetic();
  54                 fSchedulingRule= ResourcesPlugin.getWorkspace().getRoot();
  55         }
  56
  57         public DynamicValidationStateChange(String name, Change[] changes) {
  58                 super(name, changes);
  59                 markAsSynthetic();
  60                 fSchedulingRule= ResourcesPlugin.getWorkspace().getRoot();
  61         }
  62
  63         /**
  64          * {@inheritDoc}
  65          */
  66         @Override
  67         public void initializeValidationData(IProgressMonitor pm) {
  68                 super.initializeValidationData(pm);
  69                 WorkspaceTracker.INSTANCE.addListener(this);
  70                 fListenerRegistered= true;
  71                 fTimeStamp= System.currentTimeMillis();
  72         }
  73
  74         @Override
  75         public void dispose() {
  76                 if (fListenerRegistered) {
  77                         WorkspaceTracker.INSTANCE.removeListener(this);
  78                         fListenerRegistered= false;
  79                 }
  80                 super.dispose();
  81         }
  82
  83         /**
  84          * {@inheritDoc}
  85          */
  86         @Override
  87         public RefactoringStatus isValid(IProgressMonitor pm) throws CoreException {
  88                 if (fValidationState == null) {
  89                         return super.isValid(pm);
  90                 }
  91                 return fValidationState;
  92         }
  93
  94         /**
  95          * {@inheritDoc}
  96          */
  97         @Override
  98         public Change perform(IProgressMonitor pm) throws CoreException {
  99                 final Change[] result= new Change[1];
 100                 IWorkspaceRunnable runnable= new IWorkspaceRunnable() {
 101                         public void run(IProgressMonitor monitor) throws CoreException {
 102                                 result[0]= DynamicValidationStateChange.super.perform(monitor);
 103                         }
 104                 };
 105                 JavaCore.run(runnable, fSchedulingRule, pm);
 106                 return result[0];
 107         }
 108
 109         /**
 110          * {@inheritDoc}
 111          */
 112         @Override
 113         protected Change createUndoChange(Change[] childUndos) {
 114                 DynamicValidationStateChange result= new DynamicValidationStateChange(getName());
 115                 for (int i= 0; i < childUndos.length; i++) {
 116                         result.add(childUndos[i]);
 117                 }
 118                 return result;
 119         }
 120
 121         public void workspaceChanged() {
 122                 long currentTime= System.currentTimeMillis();
 123                 if (currentTime - fTimeStamp < LIFE_TIME)
 124                         return;
 125                 fValidationState= RefactoringStatus.createFatalErrorStatus(RefactoringCoreMessages.DynamicValidationStateChange_workspace_changed);
 126                 // remove listener from workspace tracker
 127                 WorkspaceTracker.INSTANCE.removeListener(this);
 128                 fListenerRegistered= false;
 129                 // clear up the children to not hang onto too much memory
 130                 Change[] children= clear();
 131                 for (int i= 0; i < children.length; i++) {
 132                         final Change change= children[i];
 133                         SafeRunner.run(new ISafeRunnable() {
 134                                 public void run() throws Exception {
 135                                         change.dispose();
 136                                 }
 137                                 public void handleException(Throwable exception) {
 138                                         JavaPlugin.log(exception);
 139                                 }
 140                         });
 141                 }
 142         }
 143
 144         public void setSchedulingRule(ISchedulingRule schedulingRule) {
 145                 fSchedulingRule= schedulingRule;
 146         }
 147
 148         public ISchedulingRule getSchedulingRule() {
 149                 return fSchedulingRule;
 150         }
 151 }