| /* |
| * Copyright 2000-2013 JetBrains s.r.o. |
| * |
| * 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. |
| */ |
| package com.intellij.openapi.diff; |
| |
| import com.intellij.openapi.application.ApplicationManager; |
| import com.intellij.openapi.command.CommandProcessor; |
| import com.intellij.openapi.diagnostic.Logger; |
| import com.intellij.openapi.editor.Document; |
| import com.intellij.openapi.editor.event.DocumentAdapter; |
| import com.intellij.openapi.editor.event.DocumentEvent; |
| import com.intellij.openapi.project.Project; |
| import org.jetbrains.annotations.NotNull; |
| |
| import java.beans.PropertyChangeEvent; |
| import java.beans.PropertyChangeListener; |
| |
| abstract class DocumentsSynchronizer { |
| private static final Logger LOG = Logger.getInstance("#com.intellij.openapi.diff.DocumentsSynchonizer"); |
| private Document myOriginal = null; |
| private Document myCopy = null; |
| private final Project myProject; |
| |
| private volatile boolean myDuringModification = false; |
| private int myAssignedCount = 0; |
| |
| private final DocumentAdapter myOriginalListener = new DocumentAdapter() { |
| @Override |
| public void documentChanged(DocumentEvent e) { |
| if (myDuringModification) return; |
| onOriginalChanged(e, getCopy()); |
| } |
| }; |
| |
| private final DocumentAdapter myCopyListener = new DocumentAdapter() { |
| @Override |
| public void documentChanged(DocumentEvent e) { |
| if (myDuringModification) return; |
| onCopyChanged(e, getOriginal()); |
| } |
| }; |
| private final PropertyChangeListener myROListener = new PropertyChangeListener() { |
| @Override |
| public void propertyChange(PropertyChangeEvent evt) { |
| if (Document.PROP_WRITABLE.equals(evt.getPropertyName())) getCopy().setReadOnly(!getOriginal().isWritable()); |
| } |
| }; |
| |
| protected DocumentsSynchronizer(Project project) { |
| myProject = project; |
| } |
| |
| protected abstract void onCopyChanged(@NotNull DocumentEvent event, @NotNull Document original); |
| |
| protected abstract void onOriginalChanged(@NotNull DocumentEvent event, @NotNull Document copy); |
| |
| protected abstract void beforeListenersAttached(@NotNull Document original, @NotNull Document copy); |
| |
| protected abstract Document createOriginal(); |
| |
| @NotNull |
| protected abstract Document createCopy(); |
| |
| protected void replaceString(@NotNull final Document document, final int startOffset, final int endOffset, @NotNull final String newText) { |
| LOG.assertTrue(!myDuringModification); |
| try { |
| myDuringModification = true; |
| CommandProcessor.getInstance().executeCommand(myProject, new Runnable() { |
| @Override |
| public void run() { |
| LOG.assertTrue(endOffset <= document.getTextLength()); |
| ApplicationManager.getApplication().runWriteAction(new Runnable() { |
| @Override |
| public void run() { |
| document.replaceString(startOffset, endOffset, newText); |
| } |
| }); |
| } |
| }, DiffBundle.message("save.merge.result.command.name"), document); |
| } |
| finally { |
| myDuringModification = false; |
| } |
| } |
| |
| public void listenDocuments(boolean startListen) { |
| int prevAssignedCount = myAssignedCount; |
| if (startListen) { |
| myAssignedCount++; |
| } |
| else { |
| myAssignedCount--; |
| } |
| LOG.assertTrue(myAssignedCount >= 0); |
| if (prevAssignedCount == 0 && myAssignedCount > 0) startListen(); |
| if (myAssignedCount == 0 && prevAssignedCount > 0) stopListen(); |
| } |
| |
| private void startListen() { |
| final Document original = getOriginal(); |
| final Document copy = getCopy(); |
| if (original == null) return; |
| |
| beforeListenersAttached(original, copy); |
| original.addDocumentListener(myOriginalListener); |
| copy.addDocumentListener(myCopyListener); |
| original.addPropertyChangeListener(myROListener); |
| } |
| |
| |
| private void stopListen() { |
| if (myOriginal != null) { |
| myOriginal.removeDocumentListener(myOriginalListener); |
| myOriginal.removePropertyChangeListener(myROListener); |
| } |
| |
| if (myCopy != null) { |
| myCopy.removeDocumentListener(myCopyListener); |
| } |
| |
| myOriginal = null; |
| myCopy = null; |
| } |
| |
| public Document getOriginal() { |
| if (myOriginal == null) myOriginal = createOriginal(); |
| return myOriginal; |
| } |
| |
| @NotNull |
| public Document getCopy() { |
| if (myCopy == null) myCopy = createCopy(); |
| return myCopy; |
| } |
| } |