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/*******************************************************************************
* Copyright (c) 2011 Wind River Systems, Inc. and others. All rights reserved.
* This program and the accompanying materials are made available under the terms
* of the Eclipse Public License v1.0 which accompanies this distribution, and is
* available at http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Wind River Systems - initial API and implementation
* William Chen (Wind River)- [345552] Edit the remote files with a proper editor
*******************************************************************************/
package org.eclipse.tcf.te.tcf.filesystem.ui.internal.compare;
import org.eclipse.compare.ITypedElement;
import org.eclipse.compare.structuremergeviewer.Differencer;
import org.eclipse.compare.structuremergeviewer.ICompareInput;
import org.eclipse.compare.structuremergeviewer.ICompareInputChangeListener;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.ListenerList;
import org.eclipse.core.runtime.SafeRunner;
import org.eclipse.jface.util.SafeRunnable;
import org.eclipse.swt.graphics.Image;
import org.eclipse.tcf.te.tcf.filesystem.ui.nls.Messages;
/**
* An abstract compare input whose purpose is to support change notification
* through a {@link CompareInputChangeNotifier}.
*/
public class MergeInput implements ICompareInput {
// The left element.
private ITypedElement left;
// The right element.
private ITypedElement right;
// The compare input change listener list.
private final ListenerList listeners = new ListenerList(ListenerList.IDENTITY);
/**
* Create a <code>MergeInput</code>.
* @param left the left element.
* @param right the right element.
*/
public MergeInput(ITypedElement left, ITypedElement right) {
this.left = left;
this.right = right;
}
/* (non-Javadoc)
* @see org.eclipse.compare.structuremergeviewer.ICompareInput#addCompareInputChangeListener(org.eclipse.compare.structuremergeviewer.ICompareInputChangeListener)
*/
@Override
public void addCompareInputChangeListener(ICompareInputChangeListener listener) {
listeners.add(listener);
}
/* (non-Javadoc)
* @see org.eclipse.compare.structuremergeviewer.ICompareInput#removeCompareInputChangeListener(org.eclipse.compare.structuremergeviewer.ICompareInputChangeListener)
*/
@Override
public void removeCompareInputChangeListener(ICompareInputChangeListener listener) {
listeners.remove(listener);
}
/**
* Fire a compare input change event. This method must be called from the UI
* thread.
*/
void fireInputChanged() {
if (!listeners.isEmpty()) {
Object[] _listeners = listeners.getListeners();
for (int i = 0; i < _listeners.length; i++) {
final ICompareInputChangeListener listener = (ICompareInputChangeListener) _listeners[i];
SafeRunner.run(new SafeRunnable() {
@Override
public void handleException(Throwable e) {
// Ignore exception
}
@Override
public void run() throws Exception {
listener.compareInputChanged(MergeInput.this);
}
});
}
}
}
/* (non-Javadoc)
* @see org.eclipse.compare.structuremergeviewer.ICompareInput#copy(boolean)
*/
@Override
public void copy(boolean leftToRight) {
Assert.isTrue(false, Messages.MergeInput_CopyNotSupported);
}
/* (non-Javadoc)
* @see org.eclipse.compare.structuremergeviewer.ICompareInput#getAncestor()
*/
@Override
public ITypedElement getAncestor() {
return null;
}
/* (non-Javadoc)
* @see org.eclipse.compare.structuremergeviewer.ICompareInput#getImage()
*/
@Override
public Image getImage() {
ITypedElement element = getMainElement();
return element == null ? null : element.getImage();
}
/**
* Return the main non-null element that identifies this input. By default,
* the fLeft is returned if non-null. If the fLeft is null, the fRight is
* returned. If both the fLeft and fRight are null the ancestor is returned.
*
* @return the main non-null element that identifies this input
*/
private ITypedElement getMainElement() {
if (left != null)
return left;
if (right != null)
return right;
return null;
}
/* (non-Javadoc)
* @see org.eclipse.compare.structuremergeviewer.ICompareInput#getKind()
*/
@Override
public int getKind() {
return Differencer.CHANGE;
}
/* (non-Javadoc)
* @see org.eclipse.compare.structuremergeviewer.ICompareInput#getLeft()
*/
@Override
public ITypedElement getLeft() {
return left;
}
/* (non-Javadoc)
* @see org.eclipse.compare.structuremergeviewer.ICompareInput#getName()
*/
@Override
public String getName() {
ITypedElement element = getMainElement();
return element == null ? null : element.getName();
}
/* (non-Javadoc)
* @see org.eclipse.compare.structuremergeviewer.ICompareInput#getRight()
*/
@Override
public ITypedElement getRight() {
return right;
}
}
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