Copyright (c) 2000, 2011 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, 2011 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 java.net.URI;

import org.eclipse.core.filesystem.EFS;
import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceProxy;
import org.eclipse.core.resources.IResourceProxyVisitor;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jdt.internal.compiler.util.SimpleLookupTable;
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;

public class IndexBinaryFolder extends IndexRequest {
	IContainer folder;

	public IndexBinaryFolder(IContainer folder, IndexManager manager) {
		super(folder.getFullPath(), manager);
		this.folder = folder;
	}
	@Override
	public boolean equals(Object o) {
		if (o instanceof IndexBinaryFolder)
			return this.folder.equals(((IndexBinaryFolder) o).folder);
		return false;
	}
	
Ensure consistency of a folder index. Need to walk all nested resources,
and discover resources which have either been changed, added or deleted
since the index was produced.
/**
	 * Ensure consistency of a folder index. Need to walk all nested resources,
	 * and discover resources which have either been changed, added or deleted
	 * since the index was produced.
	 */
	@Override
	public boolean execute(IProgressMonitor progressMonitor) {

		if (this.isCancelled || progressMonitor != null && progressMonitor.isCanceled()) return true;
		if (!this.folder.isAccessible()) return true; // nothing to do

		Index index = this.manager.getIndexForUpdate(this.containerPath, true, /*reuse index file*/ true /*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[] paths = index.queryDocumentNames(""); // all file names //$NON-NLS-1$
			int max = paths == null ? 0 : paths.length;
			final SimpleLookupTable indexedFileNames = new SimpleLookupTable(max==0 ? 33 : max+11);
			final String OK = "OK"; //$NON-NLS-1$
			final String DELETED = "DELETED"; //$NON-NLS-1$
			if (paths == null) {
				this.folder.accept(new IResourceProxyVisitor() {
					@Override
					public boolean visit(IResourceProxy proxy) {
						if (IndexBinaryFolder.this.isCancelled) return false;
						if (proxy.getType() == IResource.FILE) {
							if (org.eclipse.jdt.internal.compiler.util.Util.isClassFileName(proxy.getName())) {
								IFile file = (IFile) proxy.requestResource();
								String containerRelativePath = Util.relativePath(file.getFullPath(), IndexBinaryFolder.this.containerPath.segmentCount());
								indexedFileNames.put(containerRelativePath, file);
							}
							return false;
						}
						return true;
					}
				}, IResource.NONE);
			} else {
				for (int i = 0; i < max; i++) {
					indexedFileNames.put(paths[i], DELETED);
				}
				final long indexLastModified = index.getIndexLastModified();
				this.folder.accept(
					new IResourceProxyVisitor() {
						@Override
						public boolean visit(IResourceProxy proxy) throws CoreException {
							if (IndexBinaryFolder.this.isCancelled) return false;
							if (proxy.getType() == IResource.FILE) {
								if (org.eclipse.jdt.internal.compiler.util.Util.isClassFileName(proxy.getName())) {
									IFile file = (IFile) proxy.requestResource();
									URI location = file.getLocationURI();
									if (location != null) {
										String containerRelativePath = Util.relativePath(file.getFullPath(), IndexBinaryFolder.this.containerPath.segmentCount());
										indexedFileNames.put(containerRelativePath,
											indexedFileNames.get(containerRelativePath) == null
													|| indexLastModified <
													EFS.getStore(location).fetchInfo().getLastModified()
												? (Object) file
												: (Object) OK);
									}
								}
								return false;
							}
							return true;
						}
					},
					IResource.NONE
				);
			}

			Object[] names = indexedFileNames.keyTable;
			Object[] values = indexedFileNames.valueTable;
			for (int i = 0, length = names.length; i < length; i++) {
				String name = (String) names[i];
				if (name != null) {
					if (this.isCancelled) return false;

					Object value = values[i];
					if (value != OK) {
						if (value == DELETED)
							this.manager.remove(name, this.containerPath);
						else {
							this.manager.addBinary((IFile) value, this.containerPath);
						}
					}
				}
			}

			// request to save index when all class files have been indexed... also sets state to SAVED_STATE
			this.manager.request(new SaveIndex(this.containerPath, this.manager));
		} catch (CoreException | IOException e) {
			if (JobManager.VERBOSE) {
				Util.verbose("-> failed to index " + this.folder + " because of the following exception:", System.err); //$NON-NLS-1$ //$NON-NLS-2$
				e.printStackTrace();
			}
			this.manager.removeIndex(this.containerPath);
			return false;
		} finally {
			monitor.exitRead(); // free read lock
		}
		return true;
	}
	@Override
	public int hashCode() {
		return this.folder.hashCode();
	}
	@Override
	protected Integer updatedIndexState() {
		return IndexManager.REBUILDING_STATE;
	}
	@Override
	public String toString() {
		return "indexing binary folder " + this.folder.getFullPath(); //$NON-NLS-1$
	}
}