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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, 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
 *     James Blackburn (Broadcom Corp.) - ongoing development
 *******************************************************************************/
package org.eclipse.core.internal.resources;

import java.io.DataOutputStream;
import java.io.IOException;
import java.util.*;
import org.eclipse.core.internal.watson.IPathRequestor;
import org.eclipse.core.runtime.QualifiedName;

public class SyncInfoWriter {
	protected Synchronizer synchronizer;
	protected Workspace workspace;

	// version number
	public static final int SYNCINFO_SAVE_VERSION = 3;
	public static final int SYNCINFO_SNAP_VERSION = 3;

	// for sync info
	public static final byte INDEX = 1;
	public static final byte QNAME = 2;

	public SyncInfoWriter(Workspace workspace, Synchronizer synchronizer) {
		super();
		this.workspace = workspace;
		this.synchronizer = synchronizer;
	}

	public void savePartners(DataOutputStream output) throws IOException {
		Set registry = synchronizer.getRegistry();
		output.writeInt(registry.size());
		for (QualifiedName qname : registry) {
			output.writeUTF(qname.getQualifier());
			output.writeUTF(qname.getLocalName());
		}
	}

	/**
	 *  {@code
	 * SAVE_FILE -> VERSION_ID RESOURCE+
	 * VERSION_ID -> int
	 * RESOURCE -> RESOURCE_PATH SIZE SYNCINFO*
	 * RESOURCE_PATH -> String
	 * SIZE -> int
	 * SYNCINFO -> TYPE BYTES
	 * TYPE -> INDEX | QNAME
	 * INDEX -> byte int
	 * QNAME -> byte String
	 * BYTES -> byte[]
	 * }
	 */
	public void saveSyncInfo(ResourceInfo info, IPathRequestor requestor, DataOutputStream output, List writtenPartners) throws IOException {
		Map table = info.getSyncInfo(false);
		if (table == null)
			return;
		// if this is the first sync info that we have written, then
		// write the version id for the file.
		if (output.size() == 0)
			output.writeInt(SYNCINFO_SAVE_VERSION);
		output.writeUTF(requestor.requestPath().toString());
		output.writeInt(table.size());
		for (Map.Entry entry : table.entrySet()) {
			QualifiedName name = entry.getKey();
			// if we have already written the partner name once, then write an integer
			// constant to represent it instead to remove duplication
			int index = writtenPartners.indexOf(name);
			if (index == -1) {
				// FIXME: what to do about null qualifier?
				output.writeByte(QNAME);
				output.writeUTF(name.getQualifier());
				output.writeUTF(name.getLocalName());
				writtenPartners.add(name);
			} else {
				output.writeByte(INDEX);
				output.writeInt(index);
			}
			byte[] bytes = (byte[]) entry.getValue();
			output.writeInt(bytes.length);
			output.write(bytes);
		}
	}

	/**
	 *  {@code
	 * SNAP_FILE -> [VERSION_ID RESOURCE]*
	 * VERSION_ID -> int
	 * RESOURCE -> RESOURCE_PATH SIZE SYNCINFO*
	 * RESOURCE_PATH -> String
	 * SIZE -> int
	 * SYNCINFO -> QNAME BYTES
	 * QNAME -> String String
	 * BYTES -> byte[]
	 * }
	 */
	public void snapSyncInfo(ResourceInfo info, IPathRequestor requestor, DataOutputStream output) throws IOException {
		if (!info.isSet(ICoreConstants.M_SYNCINFO_SNAP_DIRTY))
			return;
		Map table = info.getSyncInfo(false);
		if (table == null)
			return;
		// write the version id for the snapshot.
		output.writeInt(SYNCINFO_SNAP_VERSION);
		output.writeUTF(requestor.requestPath().toString());
		output.writeInt(table.size());
		for (Map.Entry entry : table.entrySet()) {
			QualifiedName name = entry.getKey();
			output.writeUTF(name.getQualifier());
			output.writeUTF(name.getLocalName());
			byte[] bytes = (byte[]) entry.getValue();
			output.writeInt(bytes.length);
			output.write(bytes);
		}
		info.clear(ICoreConstants.M_SYNCINFO_SNAP_DIRTY);
	}
}