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/*******************************************************************************
* Copyright (c) 2000, 2011 IBM Corporation 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.compare;
import org.eclipse.core.runtime.Adapters;
/**
* Supports cross-pane navigation through the differences of a compare container.
* <p>
* Clients may subclass this class.
* </p>
* @see INavigatable
* @since 3.3
*/
public abstract class CompareNavigator implements ICompareNavigator {
@Override
public boolean selectChange(boolean next) {
// find most down stream CompareViewerPane
INavigatable[] navigators= getNavigatables();
Object downStreamInput = null;
for (int i = navigators.length - 1; i >=0; i--) {
INavigatable navigatable = navigators[i];
if (navigatable.getInput() == downStreamInput) {
// Skip to up stream pane if it has the same input
continue;
}
if (navigatable.selectChange(next ? INavigatable.NEXT_CHANGE : INavigatable.PREVIOUS_CHANGE)) {
// at end of this navigator
downStreamInput = navigatable.getInput();
continue;
}
// not at end
if (i + 1 < navigators.length && navigators[i + 1] != null
&& navigators[i + 1].getInput() != downStreamInput) {
// The navigation has invoked a change in a downstream pane.
// Set the selected change depending on the direction we are navigating
navigators[i+1].selectChange(next ? INavigatable.FIRST_CHANGE : INavigatable.LAST_CHANGE);
}
return false;
}
return true;
}
protected abstract INavigatable[] getNavigatables();
/**
* Returns the {@link INavigatable} for the given object if the object
* adapts to {@link INavigatable}.
*
* @param object the object
* @return the {@link INavigatable} for the given object or {@code null}
*/
protected final INavigatable getNavigator(Object object) {
if (object == null)
return null;
return Adapters.adapt(object, INavigatable.class);
}
/**
* Returns whether a call to {@link ICompareNavigator#selectChange(boolean)}
* with the same parameter would succeed.
*
* @param next if <code>true</code> the next change is selected, otherwise
* the previous change
* @return whether a call to {@link ICompareNavigator#selectChange(boolean)}
* with the same parameter would succeed.
* @since 3.3
*/
public boolean hasChange(boolean next) {
INavigatable[] navigators= getNavigatables();
Object downStreamInput = null;
for (int i = navigators.length; --i >= 0;) {
INavigatable navigatable = navigators[i];
if (navigatable.getInput() == downStreamInput) {
// Skip to up stream pane if it has the same input
continue;
}
if (navigatable.hasChange(next ? INavigatable.NEXT_CHANGE : INavigatable.PREVIOUS_CHANGE)) {
return true;
}
// at end of this navigator
downStreamInput = navigatable.getInput();
}
return false;
}
}
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