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/*******************************************************************************
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* Copyright (c) 2006, 2010 IBM Corporation and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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******************************************************************************/
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package org.eclipse.ui.internal.navigator.sorters;
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import org.eclipse.core.expressions.EvaluationResult;
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import org.eclipse.core.expressions.Expression;
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import org.eclipse.core.expressions.IEvaluationContext;
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import org.eclipse.core.runtime.IConfigurationElement;
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import org.eclipse.core.runtime.SafeRunner;
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import org.eclipse.jface.viewers.ViewerSorter;
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import org.eclipse.ui.internal.navigator.CustomAndExpression;
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import org.eclipse.ui.internal.navigator.NavigatorPlugin;
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import org.eclipse.ui.internal.navigator.NavigatorSafeRunnable;
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import org.eclipse.ui.internal.navigator.extensions.INavigatorContentExtPtConstants;
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/**
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*
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* Describes a <b>commonSorter</b> element under a
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* <b>org.eclipse.ui.navigator.navigatorContent</b> extension.
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*
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* @since 3.2
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*/
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public class CommonSorterDescriptor implements INavigatorContentExtPtConstants {
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private IConfigurationElement element;
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private Expression parentExpression;
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private String id;
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protected CommonSorterDescriptor(IConfigurationElement anElement) {
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element = anElement;
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init();
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}
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private void init() {
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id = element.getAttribute(ATT_ID);
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if (id == null) {
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id = ""; //$NON-NLS-1$
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}
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IConfigurationElement[] children = element
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.getChildren(TAG_PARENT_EXPRESSION);
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if (children.length == 1) {
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parentExpression = new CustomAndExpression(children[0]);
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}
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}
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/**
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*
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* @return An identifier used to determine whether the sorter is visible.
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* May not be unique.
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*/
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public String getId() {
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return id;
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}
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/**
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*
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* @param aParent
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* An element from the viewer
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* @return True if and only if this CommonSorter can sort the children of
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* the given parent.
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*/
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public boolean isEnabledForParent(Object aParent) {
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if(aParent == null) {
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return false;
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}
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if (parentExpression != null) {
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IEvaluationContext context = NavigatorPlugin.getEvalContext(aParent);
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return NavigatorPlugin.safeEvaluate(parentExpression, context) == EvaluationResult.TRUE;
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}
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return true;
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}
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/**
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*
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* @return An instance of the ViewerSorter defined by the extension. Callers
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* of this method are responsible for managing the instantiated
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* filter.
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*/
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public ViewerSorter createSorter() {
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final ViewerSorter[] sorter = new ViewerSorter[1];
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SafeRunner.run(new NavigatorSafeRunnable(element) {
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public void run() throws Exception {
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sorter[0] = (ViewerSorter) element.createExecutableExtension(ATT_CLASS);
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}
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});
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if (sorter[0] != null)
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return sorter[0];
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return SkeletonViewerSorter.INSTANCE;
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}
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/*
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* (non-Javadoc)
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*
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* @see java.lang.Object#toString()
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*/
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public String toString() {
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return "CommonSorterDescriptor[" + getId() + "]"; //$NON-NLS-1$//$NON-NLS-2$
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}
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}
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