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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, 2009 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
 *******************************************************************************/
package org.eclipse.core.resources;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.QualifiedName;

/**
 * A synchronizer which maintains a list of registered partners and, on behalf of
 * each partner, it keeps resource level synchronization information
 * (a byte array). Sync info is saved only when the workspace is saved.
 *
 * @see IWorkspace#getSynchronizer()
 * @noimplement This interface is not intended to be implemented by clients.
 * @noextend This interface is not intended to be extended by clients.
 */
public interface ISynchronizer {
	/**
	 * Visits the given resource and its descendents with the specified visitor
	 * if sync information for the given sync partner is found on the resource. If
	 * sync information for the given sync partner is not found on the resource,
	 * still visit the children of the resource if the depth specifies to do so.
	 *
	 * @param partner the sync partner name
	 * @param start the parent resource to start the visitation
	 * @param visitor the visitor to use when visiting the resources
	 * @param depth the depth to which members of this resource should be
	 *		visited.  One of IResource.DEPTH_ZERO, IResource.DEPTH_ONE,
	 *		or IResource.DEPTH_INFINITE.
	 * @exception CoreException if this operation fails. Reasons include:
	 *    
	 *    The resource does not exist.
	 *    IResourceStatus.PARTNER_NOT_REGISTERED
	 The sync partner is not registered.
	 *    
	 */
	void accept(QualifiedName partner, IResource start, IResourceVisitor visitor, int depth) throws CoreException;

	/**
	 * Adds the named synchronization partner to this synchronizer's
	 * registry of partners. Once a partner's name has been registered, sync
	 * information can be set and retrieve on resources relative to the name.
	 * Adding a sync partner multiple times has no effect.
	 *
	 * @param partner the partner name to register
	 * @see #remove(QualifiedName)
	 */
	void add(QualifiedName partner);

	/**
	 * Discards the named partner's synchronization information
	 * associated with the specified resource and its descendents to the
	 * specified depth.
	 *
	 * @param partner the sync partner name
	 * @param resource the resource
	 * @param depth the depth to which members of this resource should be
	 *		visited.  One of IResource.DEPTH_ZERO, IResource.DEPTH_ONE,
	 *		or IResource.DEPTH_INFINITE.
	 * @exception CoreException if this operation fails. Reasons include:
	 *    
	 *    The resource does not exist.
	 *    IResourceStatus.PARTNER_NOT_REGISTERED
	 The sync partner is not registered.
	 *    
	 */
	void flushSyncInfo(QualifiedName partner, IResource resource, int depth) throws CoreException;

	/**
	 * Returns a list of synchronization partner names currently registered
	 * with this synchronizer. Returns an empty array if there are no
	 * registered sync partners.
	 *
	 * @return a list of sync partner names
	 */
	QualifiedName[] getPartners();

	/**
	 * Returns the named sync partner's synchronization information for the given resource.
	 * Returns null if no information is found.
	 *
	 * @param partner the sync partner name
	 * @param resource the resource
	 * @return the synchronization information, or null if none
	 * @exception CoreException if this operation fails. Reasons include:
	 *    
	 *    IResourceStatus.PARTNER_NOT_REGISTERED
	 The sync partner is not registered.
	 *    
	 */
	byte[] getSyncInfo(QualifiedName partner, IResource resource) throws CoreException;

	/**
	 * Removes the named synchronization partner from this synchronizer's
	 * registry.  Does nothing if the partner is not registered.
	 * This discards all sync information for the defunct partner.
	 * After a partner has been unregistered, sync information for it can no
	 * longer be stored on resources.
	 *
	 * @param partner the partner name to remove from the registry
	 * @see #add(QualifiedName)
	 */
	void remove(QualifiedName partner);

	/**
	 * Sets the named sync partner's synchronization information for the given resource.
	 * If the given info is non-null and the resource neither exists
	 * nor is a phantom, this method creates a phantom resource to hang on to the info.
	 * If the given info is null, any sync info for the resource stored by the
	 * given sync partner is discarded; in some cases, this may result in the deletion
	 * of a phantom resource if there is no more sync info to maintain for that resource.
	 * 
	 * Sync information is not stored on the workspace root. Attempts to set information
	 * on the root will be ignored.
	 * 
	 *
	 * @param partner the sync partner name
	 * @param resource the resource
	 * @param info the synchronization information, or null
	 * @exception CoreException if this operation fails. Reasons include:
	 *    
	 *    IResourceStatus.PARTNER_NOT_REGISTERED
	 The sync partner is not registered.
	 *    
	 */
	void setSyncInfo(QualifiedName partner, IResource resource, byte[] info) throws CoreException;
}