IndexBinaryFolder.java

/*******************************************************************************
 * Copyright (c) 2000, 2009 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.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;
	}

	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.
	 */
	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() {
					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.getIndexFile().lastModified();
				this.folder.accept(
						new IResourceProxyVisitor() {
							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 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;
		} catch (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;
	}

	public int hashCode() {
		return this.folder.hashCode();
	}

	protected Integer updatedIndexState() {
		return IndexManager.REBUILDING_STATE;
	}

	public String toString() {
		return "indexing binary folder " + this.folder.getFullPath(); //$NON-NLS-1$
	}
}