/*******************************************************************************
 * Copyright (c) 2010 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.jst.jsp.ui.internal.contentassist;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.jface.text.IDocument;
import org.eclipse.wst.sse.core.StructuredModelManager;
import org.eclipse.wst.sse.core.internal.provisional.IStructuredModel;
import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocumentRegion;
import org.eclipse.wst.xml.ui.internal.contentassist.ContentAssistRequest;

/**
 * <p>Helpful utility methods for JSP content assist</p>
 */
public class JSPContentAssistHelper {
	/**
	 * Returns project request is in
	 * 
	 * @param request
	 * @return {@link IResource} representing the project the given request was made in
	 */
	public static IResource getResource(ContentAssistRequest request) {
		IResource resource = null;
		String baselocation = null;

		if (request != null) {
			IStructuredDocumentRegion region = request.getDocumentRegion();
			if (region != null) {
				IDocument document = region.getParentDocument();
				IStructuredModel model = null;
				try {
					model = StructuredModelManager.getModelManager().getExistingModelForRead(document);
					if (model != null) {
						baselocation = model.getBaseLocation();
					}
				} finally {
					if (model != null)
						model.releaseFromRead();
				}
			}
		}

		if (baselocation != null) {
			// copied from JSPTranslationAdapter#getJavaProject
			IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
			IPath filePath = new Path(baselocation);
			IFile file = null;

			if (filePath.segmentCount() > 1) {
				file = root.getFile(filePath);
			}
			if (file != null) {
				resource = file.getProject();
			}
		}
		return resource;
	}
}