bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/MarkersViewPropertyTester.java

/*******************************************************************************
 * Copyright (c) 2007 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.ui.internal.views.markers;

import org.eclipse.core.expressions.PropertyTester;

/**
 * ContentGeneratorPropertyTester is the property tester for what content
 * generator is being shown.
 * 
 * @since 3.4
 * 
 */
public class MarkersViewPropertyTester extends PropertyTester {

	private static final String ATTRIBUTE_CONTENT_GENERATOR = "contentGenerator"; //$NON-NLS-1$


	private static final String ATTRIBUTE_HAS_FILTERS = "hasFilters"; //$NON-NLS-1$

	private static final String ATTRIBUTE_HAS_GROUPS = "hasGroups"; //$NON-NLS-1$

	private static final String ANY_CONTENT_GENERATOR = "any"; //$NON-NLS-1$

	/**
	 * Create a new instance of the receiver.
	 */
	public MarkersViewPropertyTester() {
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.expressions.IPropertyTester#test(java.lang.Object,
	 *      java.lang.String, java.lang.Object[], java.lang.Object)
	 */
	public boolean test(Object receiver, String property, Object[] args,
			Object expectedValue) {

		if (!(receiver instanceof ExtendedMarkersView))
			return false;

		ExtendedMarkersView view = (ExtendedMarkersView) receiver;

		if (property.equals(ATTRIBUTE_CONTENT_GENERATOR))
			return testContentGenerator(view, args);
		if (property.equals(ATTRIBUTE_HAS_FILTERS))
			return view.getAllFilters().size() > 0;
		if (property.equals(ATTRIBUTE_HAS_GROUPS))
			return view.getBuilder().getGenerator().getMarkerGroups().size() > 0;

		return false;
	}

	/**
	 * Test if the content generator in the args match the receiver.
	 * 
	 * @param view
	 * @param args
	 * @return boolean
	 */
	private boolean testContentGenerator(ExtendedMarkersView view, Object[] args) {

		String currentGenerator = view.getBuilder().getGenerator().getId();
		for (int i = 0; i < args.length; i++) {
			if (args[i].equals(currentGenerator))
				return true;

			// The value 'any' works for any content generator
			if (args[i].equals(ANY_CONTENT_GENERATOR))
				return true;
		}
		return false;
	}
}