Copyright (c) 2000, 2010 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
/*******************************************************************************
 * Copyright (c) 2000, 2010 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.core.search.indexing;

import java.io.IOException;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.Path;
import org.eclipse.jdt.internal.core.index.Index;
import org.eclipse.jdt.internal.core.search.processing.JobManager;
import org.eclipse.jdt.internal.core.util.Util;

class RemoveFolderFromIndex extends IndexRequest {
	IPath folderPath;
	char[][] inclusionPatterns;
	char[][] exclusionPatterns;

	public RemoveFolderFromIndex(IPath folderPath, char[][] inclusionPatterns, char[][] exclusionPatterns, IProject project, IndexManager manager) {
		super(project.getFullPath(), manager);
		this.folderPath = folderPath;
		this.inclusionPatterns = inclusionPatterns;
		this.exclusionPatterns = exclusionPatterns;
	}
	@Override
	public boolean execute(IProgressMonitor progressMonitor) {

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

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

		try {
			monitor.enterRead(); // ask permission to read
			String containerRelativePath = Util.relativePath(this.folderPath, this.containerPath.segmentCount());
			String[] paths = index.queryDocumentNames(containerRelativePath);
			// all file names belonging to the folder or its subfolders and that are not excluded (see http://bugs.eclipse.org/bugs/show_bug.cgi?id=32607)
			if (paths != null) {
				if (this.exclusionPatterns == null && this.inclusionPatterns == null) {
					for (int i = 0, max = paths.length; i < max; i++) {
						this.manager.remove(paths[i], this.containerPath); // write lock will be acquired by the remove operation
					}
				} else {
					for (int i = 0, max = paths.length; i < max; i++) {
						String documentPath =  this.containerPath.toString() + '/' + paths[i];
						if (!Util.isExcluded(new Path(documentPath), this.inclusionPatterns, this.exclusionPatterns, false))
							this.manager.remove(paths[i], this.containerPath); // write lock will be acquired by the remove operation
					}
				}
			}
		} catch (IOException e) {
			if (JobManager.VERBOSE) {
				Util.verbose("-> failed to remove " + this.folderPath + " from index because of the following exception:", System.err); //$NON-NLS-1$ //$NON-NLS-2$
				e.printStackTrace();
			}
			return false;
		} finally {
			monitor.exitRead(); // free read lock
		}
		return true;
	}
	@Override
	public String toString() {
		return "removing " + this.folderPath + " from index " + this.containerPath; //$NON-NLS-1$ //$NON-NLS-2$
	}
}