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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/*******************************************************************************
 * Copyright (c) 2013, 2016 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
 *     Chris McGee (IBM) - Bug 380325 - Release filesystem fragment providing Java 7 NIO2 support
 *     Sergey Prigogin (Google) - Bug 458006 - Fix tests that fail on Mac when filesystem.java7 is used
 *******************************************************************************/
package org.eclipse.core.internal.filesystem.local.nio;

import java.io.File;
import java.io.IOException;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;
import org.eclipse.core.filesystem.EFS;
import org.eclipse.core.filesystem.IFileInfo;
import org.eclipse.core.filesystem.provider.FileInfo;
import org.eclipse.core.internal.filesystem.local.NativeHandler;

/**
 * Default implementation of NativeHandler using only Java 7 API's. It can be
 * used in cases where neither a DOS/Windows nor POSIX file system could be
 * detected.
 */
public class DefaultHandler extends NativeHandler {
	private static final int ATTRIBUTES = EFS.ATTRIBUTE_SYMLINK | EFS.ATTRIBUTE_LINK_TARGET // symbolic link support
			| EFS.ATTRIBUTE_READ_ONLY | EFS.ATTRIBUTE_EXECUTABLE; // based on Java API

	@Override
	public FileInfo fetchFileInfo(String fileName) {
		Path path = Paths.get(fileName);
		FileInfo info = new FileInfo();
		boolean exists = Files.exists(path);
		info.setExists(exists);

		try {
			BasicFileAttributes readAttributes = Files.readAttributes(path, BasicFileAttributes.class);

			// Even if it doesn't exist then check for symbolic link information.
			if (readAttributes.isSymbolicLink()) {
				info.setAttribute(EFS.ATTRIBUTE_SYMLINK, true);
				try {
					info.setStringAttribute(EFS.ATTRIBUTE_LINK_TARGET, Files.readSymbolicLink(path).toString());
				} catch (IOException e) {
					// Leave the target alone.
					info.setError(IFileInfo.IO_ERROR);
				}
			}

			// Fill in the name of the file.
			// If the file system is case insensitive, we don't know the real name of the file.
			// Since obtaining the real name in such situation is pretty expensive, we use the name
			// passed as a parameter, which may differ by case from the real name of the file
			// if the file system is case insensitive.
			info.setName(path.toFile().getName());

			// Since we will be using a mixture of pre Java 7 API's which do not support the
			// retrieval of information for the symbolic link itself instead of the target
			// we will only support the following details if the symbolic link target exists.
			if (!exists)
				return info;

			info.setLastModified(readAttributes.lastModifiedTime().toMillis());
			info.setLength(readAttributes.size());
			info.setDirectory(readAttributes.isDirectory());

			info.setAttribute(EFS.ATTRIBUTE_READ_ONLY, !Files.isWritable(path) && Files.isReadable(path));
			info.setAttribute(EFS.ATTRIBUTE_EXECUTABLE, Files.isExecutable(path));
		} catch (IOException e) {
			// Leave alone and continue.
			info.setError(IFileInfo.IO_ERROR);
		}
		return info;
	}

	@Override
	public int getSupportedAttributes() {
		return ATTRIBUTES;
	}

	@Override
	public boolean putFileInfo(String fileName, IFileInfo info, int options) {
		// In all cases we will set the information on the symbolic link target
		// and not the symbolic link itself. This is consistent with the approach
		// taken above in fetchInfo.
		File file = new File(fileName);
		if (info.getAttribute(EFS.ATTRIBUTE_READ_ONLY)) {
			if (!file.setReadOnly())
				return false;
		} else {
			if (!file.setWritable(true))
				return false;
		}
		// If setExecutable succeeds, then the whole method succeeds.
		return file.setExecutable(info.getAttribute(EFS.ATTRIBUTE_EXECUTABLE));
	}
}