midletpropertytester.java

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/**
 * Copyright (c) 2003-2005 Craig Setera
 * All Rights Reserved.
 * Licensed under the Eclipse Public License - v 1.0
 * For more information see http://www.eclipse.org/legal/epl-v10.html
 */
package eclipseme.ui.internal;

import org.eclipse.core.expressions.PropertyTester;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.jdt.core.IClassFile;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.JavaModelException;

import eclipseme.core.internal.EclipseMECorePlugin;
import eclipseme.core.internal.utils.Utils;

/**
 * A property tester implementation for querying properties of a Midlet
 * class resource.
 * <p />
 * Copyright (c) 2003-2005 Craig Setera<br>
 * All Rights Reserved.<br>
 * Licensed under the Eclipse Public License - v 1.0<p/>
 * <br>
 * $Revision: 1.2 $
 * <br>
 * $Date: 2005/07/07 02:36:26 $
 * <br>
 * @author Craig Setera
 */
public class MidletPropertyTester extends PropertyTester {
	
	private static final String PROPERTY_IS_MIDLET = "isMidlet";
	
	/**
	 * @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) 
	{
		boolean returnValue = false;
		
		if (PROPERTY_IS_MIDLET.equals(property)) {
			try {
				if (receiver instanceof IResource) {
					returnValue = isMidlet((IResource) receiver);
				} else if (receiver instanceof IJavaElement) {
					returnValue = isMidlet((IJavaElement) receiver);
				}
			} catch (JavaModelException e) {
				EclipseMECorePlugin.log(IStatus.WARNING, e);
			}
		}

		return returnValue;
	}

	/**
	 * Return a boolean indicating whether the specified resource
	 * is a midlet class.
	 * 
	 * @param resource
	 * @return
	 * @throws JavaModelException
	 */
	private boolean isMidlet(IResource resource) 
		throws JavaModelException 
	{
		return isMidlet(JavaCore.create(resource));
	}

	/**
	 * Return a boolean indicating whether the specified resource
	 * is a midlet class.
	 * 
	 * @param javaElement
	 * @return
	 * @throws JavaModelException
	 */
	private boolean isMidlet(IJavaElement javaElement) 
		throws JavaModelException 
	{
		boolean isMidlet = false;
		IType type = null;
		
		if (javaElement != null) {
			switch (javaElement.getElementType()) {
				case IJavaElement.CLASS_FILE:
					type = ((IClassFile) javaElement).getType();
					break;
				
				case IJavaElement.COMPILATION_UNIT:
					type = ((ICompilationUnit) javaElement).findPrimaryType();
					break;
				
				case IJavaElement.TYPE:
					type = (IType) javaElement;
					break;
			}
			
			isMidlet = Utils.isMidlet(type, new NullProgressMonitor());
		}
		
		return isMidlet;
	}

}