search/org/eclipse/jdt/internal/core/search/indexing/RemoveFolderFromIndex.java

/*******************************************************************************
 * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v0.5 
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v05.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 ******************************************************************************/
package org.eclipse.jdt.internal.core.search.indexing;

import java.io.IOException;

import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jdt.internal.core.index.IIndex;
import org.eclipse.jdt.internal.core.index.IQueryResult;
import org.eclipse.jdt.internal.core.search.processing.JobManager;

class RemoveFolderFromIndex extends IndexRequest {
	String folderPath;

	public RemoveFolderFromIndex(String folderPath, IPath indexPath, IndexManager manager) {
		super(indexPath, manager);
		this.folderPath = folderPath;
	}
	public boolean execute(IProgressMonitor progressMonitor) {

		if (progressMonitor != null && progressMonitor.isCanceled()) return true;

		try {
			/* ensure no concurrent write access to index */
			IIndex index = manager.getIndex(this.indexPath, true, /*reuse index file*/ false /*create if none*/);
			if (index == null) return true;
			ReadWriteMonitor monitor = manager.getMonitorFor(index);
			if (monitor == null) return true; // index got deleted since acquired

			try {
				monitor.enterRead(); // ask permission to read
				IQueryResult[] results = index.queryInDocumentNames(this.folderPath);
				// all file names belonging to the folder or its subfolders
				for (int i = 0, max = results == null ? 0 : results.length; i < max; i++)
					manager.remove(results[i].getPath(), this.indexPath); // write lock will be acquired by the remove operation
			} finally {
				monitor.exitRead(); // free read lock
			}
		} catch (IOException e) {
			if (JobManager.VERBOSE) {
				JobManager.verbose("-> failed to remove " + this.folderPath + " from index because of the following exception:"); //$NON-NLS-1$ //$NON-NLS-2$
				e.printStackTrace();
			}
			return false;
		}
		return true;
	}
	public String toString() {
		return "removing " + this.folderPath + " from index " + this.indexPath; //$NON-NLS-1$ //$NON-NLS-2$
	}
}