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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) 2000, 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
 *     James Blackburn (Broadcom Corp.) - ongoing development
 *     Lars Vogel  - Bug 473427
 *     Mickael Istria (Red Hat Inc.) - Bug 488937
 *******************************************************************************/
package org.eclipse.core.internal.resources;

import java.io.DataInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.core.internal.utils.Messages;
import org.eclipse.core.resources.IResourceStatus;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;

//
/**
 * Snapshot the markers for the specified resource to the given output stream.
 */
public class MarkerSnapshotReader_1 extends MarkerSnapshotReader {

	// type constants
	public static final byte INDEX = 1;
	public static final byte QNAME = 2;

	// marker attribute types
	public static final byte ATTRIBUTE_NULL = 0;
	public static final byte ATTRIBUTE_BOOLEAN = 1;
	public static final byte ATTRIBUTE_INTEGER = 2;
	public static final byte ATTRIBUTE_STRING = 3;

	public MarkerSnapshotReader_1(Workspace workspace) {
		super(workspace);
	}

	/**
	 *  {@code
	 * SNAP_FILE -> [VERSION_ID RESOURCE]*
	 * VERSION_ID -> int (used for backwards compatibiliy)
	 * RESOURCE -> RESOURCE_PATH MARKER_SIZE MARKER+
	 * RESOURCE_PATH -> String
	 * MARKER_SIZE -> int
	 * MARKER -> MARKER_ID TYPE ATTRIBUTES_SIZE ATTRIBUTE*
	 * MARKER_ID -> long
	 * TYPE -> INDEX | QNAME
	 * INDEX -> byte int
	 * QNAME -> byte String
	 * ATTRIBUTES_SIZE -> short
	 * ATTRIBUTE -> ATTRIBUTE_KEY ATTRIBUTE_VALUE
	 * ATTRIBUTE_KEY -> String
	 * ATTRIBUTE_VALUE -> BOOLEAN_VALUE | INTEGER_VALUE | STRING_VALUE | NULL_VALUE
	 * BOOLEAN_VALUE -> byte boolean
	 * INTEGER_VALUE -> byte int
	 * STRING_VALUE -> byte String
	 * NULL_VALUE -> byte
	 * }
	 */
	@Override
	public void read(DataInputStream input) throws IOException, CoreException {
		IPath path = IPath.fromOSString(input.readUTF());
		int markersSize = input.readInt();
		MarkerSet markers = new MarkerSet(markersSize);
		ArrayList readTypes = new ArrayList<>();
		for (int i = 0; i < markersSize; i++)
			markers.add(readMarkerInfo(input, readTypes));
		// we've read all the markers from the file for this snap. if the resource
		// doesn't exist in the workspace then consider this a delete and return
		ResourceInfo info = workspace.getResourceInfo(path, false, false);
		if (info == null)
			return;
		info.setMarkers(markers);
		info.clear(ICoreConstants.M_MARKERS_SNAP_DIRTY);
	}

	private Map readAttributes(DataInputStream input) throws IOException {
		short attributesSize = input.readShort();
		if (attributesSize == 0)
			return null;
		Map result = new HashMap<>(attributesSize);
		for (int j = 0; j < attributesSize; j++) {
			String key = input.readUTF();
			byte type = input.readByte();
			Object value = null;
			switch (type) {
				case ATTRIBUTE_INTEGER :
					value = Integer.valueOf(input.readInt());
					break;
				case ATTRIBUTE_BOOLEAN :
					value = Boolean.valueOf(input.readBoolean());
					break;
				case ATTRIBUTE_STRING :
					value = input.readUTF();
					break;
				case ATTRIBUTE_NULL :
					// do nothing
					break;
			}
			if (value != null) {
				result.put(key, value);
			}
		}
		return result.isEmpty() ? null : result;
	}

	private MarkerInfo readMarkerInfo(DataInputStream input, List readTypes) throws IOException, CoreException {
		long id = input.readLong();
		byte constant = input.readByte();
		String type = null;
		switch (constant) {
			case QNAME :
				type = input.readUTF();
				readTypes.add(type);
				break;
			case INDEX :
				type = readTypes.get(input.readInt());
				break;
			default :
				//if we get here the marker file is corrupt
				String msg = Messages.resources_readMarkers;
				throw new ResourceException(IResourceStatus.FAILED_READ_METADATA, null, msg, null);
		}
		Map map = readAttributes(input);
		long creationTime = 0;
		MarkerInfo info = new MarkerInfo(map, false, creationTime, type, id);
		return info;
	}
}