/*******************************************************************************
 * Copyright (c) 2000, 2004 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.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) {
        if (!(target instanceof IProject)) {
            return false;
        }
        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);
    }
}