ActionMethodDecorator.java

/* ====================================================================
 * 
 * The ObjectStyle Group Software License, Version 1.0 
 *
 * Copyright (c) 2006 The ObjectStyle Group 
 * and individual authors of the software.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:  
 *       "This product includes software developed by the 
 *        ObjectStyle Group (http://objectstyle.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "ObjectStyle Group" and "Cayenne" 
 *    must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written 
 *    permission, please contact andrus@objectstyle.org.
 *
 * 5. Products derived from this software may not be called "ObjectStyle"
 *    nor may "ObjectStyle" appear in their names without prior written
 *    permission of the ObjectStyle Group.
 *
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the ObjectStyle Group.  For more
 * information on the ObjectStyle Group, please see
 * <http://objectstyle.org/>.
 *
 */
package org.objectstyle.wolips.jdt.decorator;

import org.eclipse.jdt.core.Flags;
import org.eclipse.jdt.core.IMethod;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.IDecoration;
import org.eclipse.jface.viewers.ILabelDecorator;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.ILightweightLabelDecorator;
import org.eclipse.swt.graphics.Image;

public class ActionMethodDecorator implements ILabelDecorator, ILightweightLabelDecorator {

	public ActionMethodDecorator() {
		super();
	}

	public String decorateText(String text, Object element) {
		return text;
	}

	private boolean isAction(Object element) {
		if (!(element instanceof IMethod)) {
			return false;
		}
		try {
			IMethod method = (IMethod) element;
			if (!method.getJavaProject().isOnClasspath(method)) {
				return false;
			}
			if (method.isConstructor()) {
				return false;
			}
			if (method.isMainMethod()) {
				return false;
			}
			int flags = method.getFlags();
			if (Flags.isPrivate(flags) || Flags.isStatic(flags)) {
				return false;
			}
			if (method.getNumberOfParameters() > 0) {
				return false;
			}
			String returnType = method.getReturnType();
			if (returnType == null || returnType.length() == 0) {
				return false;
			}
			if (returnType.equals("QWOComponent;")) {
				return true;
			}
			if (returnType.equals("QWOActionResults;")) {
				return true;
			}
		} catch (JavaModelException e) {
			// shit happens
		}
		return false;
	}

	public Image decorateImage(Image image, Object element) {
		return image;
	}

	public void decorate(Object element, IDecoration decoration) {
		if (this.isAction(element)) {
			decoration.addOverlay(ImageDescriptor.createFromFile(ActionMethodDecorator.class, "action_overlay.gif"));
		}
	}

	public boolean isLabelProperty(Object element, String property) {
		return true;
	}

	public void removeListener(ILabelProviderListener listener) {
		return;
	}

	public void addListener(ILabelProviderListener listener) {
		return;
	}

	public void dispose() {
		return;
	}
}