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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) - ongoing development
 *******************************************************************************/
package org.eclipse.core.internal.filesystem.local.nio;

import java.io.IOException;
import java.nio.file.*;
import java.nio.file.attribute.*;
import java.util.HashSet;
import java.util.Set;
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;

/**
 * NativeHandler for POSIX using only Java 7 API's. It can be used for any
 * file system supporting POSIX family of standards.
 */
public class PosixHandler extends NativeHandler {
	private static final int ATTRIBUTES = EFS.ATTRIBUTE_SYMLINK | EFS.ATTRIBUTE_LINK_TARGET // symbolic link support
			| EFS.ATTRIBUTE_READ_ONLY | EFS.ATTRIBUTE_EXECUTABLE // mapped to owner read and owner execute via FileInfo implementation
			| EFS.ATTRIBUTE_OWNER_READ | EFS.ATTRIBUTE_OWNER_WRITE | EFS.ATTRIBUTE_OWNER_EXECUTE // owner
			| EFS.ATTRIBUTE_GROUP_READ | EFS.ATTRIBUTE_GROUP_WRITE | EFS.ATTRIBUTE_GROUP_EXECUTE // group
			| EFS.ATTRIBUTE_OTHER_READ | EFS.ATTRIBUTE_OTHER_WRITE | EFS.ATTRIBUTE_OTHER_EXECUTE; // other

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

		// 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.
		Path fileNamePath = path.getFileName();
		info.setName(fileNamePath == null ? "" : fileNamePath.toString()); //$NON-NLS-1$

		try {
			PosixFileAttributes attrs = Files.readAttributes(path, PosixFileAttributes.class, LinkOption.NOFOLLOW_LINKS);

			if (attrs.isSymbolicLink()) {
				info.setAttribute(EFS.ATTRIBUTE_SYMLINK, true);
				info.setStringAttribute(EFS.ATTRIBUTE_LINK_TARGET, Files.readSymbolicLink(path).toString());
				attrs = Files.readAttributes(path, PosixFileAttributes.class);
			}

			info.setExists(true);
			info.setLastModified(attrs.lastModifiedTime().toMillis());
			info.setLength(attrs.size());
			info.setDirectory(attrs.isDirectory());

			Set perms = attrs.permissions();
			info.setAttribute(EFS.ATTRIBUTE_OWNER_READ, perms.contains(PosixFilePermission.OWNER_READ));
			info.setAttribute(EFS.ATTRIBUTE_OWNER_WRITE, perms.contains(PosixFilePermission.OWNER_WRITE));
			info.setAttribute(EFS.ATTRIBUTE_OWNER_EXECUTE, perms.contains(PosixFilePermission.OWNER_EXECUTE));
			info.setAttribute(EFS.ATTRIBUTE_GROUP_READ, perms.contains(PosixFilePermission.GROUP_READ));
			info.setAttribute(EFS.ATTRIBUTE_GROUP_WRITE, perms.contains(PosixFilePermission.GROUP_WRITE));
			info.setAttribute(EFS.ATTRIBUTE_GROUP_EXECUTE, perms.contains(PosixFilePermission.GROUP_EXECUTE));
			info.setAttribute(EFS.ATTRIBUTE_OTHER_READ, perms.contains(PosixFilePermission.OTHERS_READ));
			info.setAttribute(EFS.ATTRIBUTE_OTHER_WRITE, perms.contains(PosixFilePermission.OTHERS_WRITE));
			info.setAttribute(EFS.ATTRIBUTE_OTHER_EXECUTE, perms.contains(PosixFilePermission.OTHERS_EXECUTE));
		} catch (NoSuchFileException e) {
			// A non-existing file is not considered an error.
		} 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) {
		Path path = Paths.get(fileName);
		Set perms = new HashSet<>();

		if (info.getAttribute(EFS.ATTRIBUTE_OWNER_READ))
			perms.add(PosixFilePermission.OWNER_READ);
		if (info.getAttribute(EFS.ATTRIBUTE_OWNER_WRITE))
			perms.add(PosixFilePermission.OWNER_WRITE);
		if (info.getAttribute(EFS.ATTRIBUTE_OWNER_EXECUTE))
			perms.add(PosixFilePermission.OWNER_EXECUTE);
		if (info.getAttribute(EFS.ATTRIBUTE_GROUP_READ))
			perms.add(PosixFilePermission.GROUP_READ);
		if (info.getAttribute(EFS.ATTRIBUTE_GROUP_WRITE))
			perms.add(PosixFilePermission.GROUP_WRITE);
		if (info.getAttribute(EFS.ATTRIBUTE_GROUP_EXECUTE))
			perms.add(PosixFilePermission.GROUP_EXECUTE);
		if (info.getAttribute(EFS.ATTRIBUTE_OTHER_READ))
			perms.add(PosixFilePermission.OTHERS_READ);
		if (info.getAttribute(EFS.ATTRIBUTE_OTHER_WRITE))
			perms.add(PosixFilePermission.OTHERS_WRITE);
		if (info.getAttribute(EFS.ATTRIBUTE_OTHER_EXECUTE))
			perms.add(PosixFilePermission.OTHERS_EXECUTE);

		PosixFileAttributeView view = Files.getFileAttributeView(path, PosixFileAttributeView.class);
		try {
			view.setPermissions(perms);
		} catch (IOException e) {
			return false;
		}
		return true;
	}
}