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/*******************************************************************************
* Copyright (c) 2006, 2020 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.team.internal.ui.mapping;
import org.eclipse.compare.ITypedElement;
import org.eclipse.compare.structuremergeviewer.ICompareInput;
import org.eclipse.compare.structuremergeviewer.ICompareInputChangeListener;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.ISafeRunnable;
import org.eclipse.core.runtime.ListenerList;
import org.eclipse.core.runtime.SafeRunner;
import org.eclipse.swt.graphics.Image;
/**
* An abstract compare input whose purpose is to support change notification
* through a {@link CompareInputChangeNotifier}.
*/
public abstract class AbstractCompareInput implements ICompareInput {
private ITypedElement ancestor;
private ITypedElement left;
private ITypedElement right;
private int kind;
private final ListenerList<ICompareInputChangeListener> listeners = new ListenerList<>(ListenerList.IDENTITY);
public AbstractCompareInput(int kind,
ITypedElement ancestor,
ITypedElement left,
ITypedElement right) {
this.kind = kind;
this.ancestor = ancestor;
this.left = left;
this.right = right;
}
@Override
public void addCompareInputChangeListener(
ICompareInputChangeListener listener) {
if (!containsListener(listener)) {
listeners.add(listener);
getChangeNotifier().connect(this);
}
}
@Override
public void removeCompareInputChangeListener(
ICompareInputChangeListener listener) {
if (containsListener(listener)) {
listeners.remove(listener);
getChangeNotifier().disconnect(this);
}
}
/**
* Fire a compare input change event.
* This method must be called from the UI thread.
*/
protected void fireChange() {
if (!listeners.isEmpty()) {
Object[] allListeners = listeners.getListeners();
for (Object l : allListeners) {
final ICompareInputChangeListener listener = (ICompareInputChangeListener) l;
SafeRunner.run(new ISafeRunnable() {
@Override
public void run() throws Exception {
listener.compareInputChanged(AbstractCompareInput.this);
}
@Override
public void handleException(Throwable exception) {
// Logged by the safe runner
}
});
}
}
}
private boolean containsListener(ICompareInputChangeListener listener) {
if (listeners.isEmpty())
return false;
Object[] allListeners = listeners.getListeners();
for (Object object : allListeners) {
if (object == listener)
return true;
}
return false;
}
@Override
public void copy(boolean leftToRight) {
Assert.isTrue(false, "Copy is not support by this type of compare input"); //$NON-NLS-1$
}
@Override
public ITypedElement getAncestor() {
return ancestor;
}
@Override
public Image getImage() {
return getMainElement().getImage();
}
/**
* Return the main non-null element that identifies
* this input. By default, the left is returned if non-null.
* If the left is null, the right is returned. If both the
* left and right 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 ancestor;
}
@Override
public int getKind() {
return kind;
}
/**
* Set the kind of this compare input
* @param kind the new kind
*/
public void setKind(int kind) {
this.kind = kind;
}
@Override
public ITypedElement getLeft() {
return left;
}
@Override
public String getName() {
return getMainElement().getName();
}
@Override
public ITypedElement getRight() {
return right;
}
/**
* Return the change notifier that will call {@link #fireChange()}
* when the state of the compare input changes.
* @return the change notifier
*/
protected abstract CompareInputChangeNotifier getChangeNotifier();
/**
* Set the ancestor of this compare input.
* @param ancestor the ancestor
*/
public void setAncestor(ITypedElement ancestor) {
this.ancestor = ancestor;
}
/**
* Set the left element of this compare input.
* @param left the left element
*/
public void setLeft(ITypedElement left) {
this.left = left;
}
/**
* Set the right element of this compare input.
* @param right the right element
*/
public void setRight(ITypedElement right) {
this.right = right;
}
/**
* Update the compare input and fire change notification.
*/
public abstract void update();
/**
* Return whether this compare input needs to be updated.
* @return whether this compare input needs to be updated
*/
public abstract boolean needsUpdate();
}
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