/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.internal.ide.model;

import java.util.HashMap;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.graphics.Point;
import org.eclipse.ui.IProjectActionFilter;
import org.eclipse.ui.ide.IDE;
import org.eclipse.ui.internal.ide.IDEInternalWorkbenchImages;
import org.eclipse.ui.internal.ide.IDEWorkbenchPlugin;
import org.eclipse.ui.internal.ide.misc.OverlayIcon;

/**
 * An IWorkbenchAdapter that represents IProject.
 */
public class WorkbenchProject extends WorkbenchResource
	implements IProjectActionFilter
{
	HashMap imageCache = new HashMap(11);
/**
 *	Answer the appropriate base image to use for the passed resource, optionally
 *	considering the passed open status as well iff appropriate for the type of
 *	passed resource
 */
protected ImageDescriptor getBaseImage(IResource resource) {
	IProject project = (IProject) resource;
	boolean isOpen = project.isOpen();
	String baseKey = isOpen ? IDE.SharedImages.IMG_OBJ_PROJECT : IDE.SharedImages.IMG_OBJ_PROJECT_CLOSED;
	if (isOpen) {
		try {
			String[] natureIds = project.getDescription().getNatureIds();
			for (int i = 0; i < natureIds.length; ++i) {
				// Have to use a cache because OverlayIcon does not define its own equality criteria,
				// so WorkbenchLabelProvider would always create a new image otherwise.
				String imageKey = natureIds[i];
				ImageDescriptor overlayImage = (ImageDescriptor) imageCache.get(imageKey);
				if (overlayImage != null) {
					return overlayImage;
				}
				ImageDescriptor natureImage = IDEWorkbenchPlugin.getDefault().getProjectImageRegistry().getNatureImage(natureIds[i]);
				if (natureImage != null) {
					ImageDescriptor baseImage = IDEInternalWorkbenchImages.getImageDescriptor(baseKey);
					overlayImage = new OverlayIcon(baseImage, new ImageDescriptor[][] {{ natureImage }}, new Point(16, 16));
					imageCache.put(imageKey, overlayImage);
					return overlayImage;
				}
			}
		}
		catch (CoreException e) {
		}
	}
	return IDEInternalWorkbenchImages.getImageDescriptor(baseKey);
}
/**
 * Returns the children of this container.
 */
public Object[] getChildren(Object o) {
	IProject project = (IProject) o;
	if (project.isOpen()) {
		try {
			return project.members();
		} catch (CoreException e) {
			//don't get the children if there are problems with the project
		}
	}
	return NO_CHILDREN;
}
/**
 * Returns whether the specific attribute matches the state of the target
 * object.
 *
 * @param target the target object
 * @param name the attribute name
 * @param value the attriute value
 * @return <code>true</code> if the attribute matches; <code>false</code> otherwise
 */
public boolean testAttribute(Object target, String name, String value) {
	IProject proj = (IProject) target;
	if (name.equals(NATURE)) {
		try {
			return proj.isAccessible() && proj.hasNature(value);
		} catch (CoreException e) {
			return false;		
		}
	} else if (name.equals(OPEN)) {
		value = value.toLowerCase();
		return (proj.isOpen() == value.equals("true"));//$NON-NLS-1$
	}
	return super.testAttribute(target, name, value);
}
}