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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.
/*******************************************************************************
* Copyright (c) 2006, 2008 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.text.undo;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.operations.IUndoContext;
/**
* Interface for a document undo manager. Tracks changes in a document and
* builds a history of text commands that describe the undoable changes to the
* document.
*
* Clients must explicitly connect to the undo manager to express their interest
* in the undo history. Clients should disconnect from the undo manager when
* they are no longer interested in tracking the undo history. If there are no
* clients connected to the undo manager, it will not track the document's
* changes and will dispose of any history that was previously kept.
*
* Clients may also listen to the undo manager for notifications before and
* after undo or redo events are performed. Clients must connect to the undo
* manager in addition to registering listeners.
*
* Clients may implement this interface.
*
*
* @see DocumentUndoManagerRegistry
* @see IDocumentUndoListener
* @see org.eclipse.jface.text.IDocument
* @since 3.2
*/
public interface IDocumentUndoManager {
/**
* Adds the specified listener to the list of document undo listeners that
* are notified before and after changes are undone or redone in the
* document. This method has no effect if the instance being added is
* already in the list.
*
* Notifications will not be received if there are no clients connected to
* the receiver. Registering a document undo listener does not implicitly
* connect the listener to the receiver.
*
* Document undo listeners must be prepared to receive notifications from a
* background thread. Any UI access occurring inside the implementation must
* be properly synchronized using the techniques specified by the client's
* widget library.
*
* @param listener the document undo listener to be added as a listener
*/
void addDocumentUndoListener(IDocumentUndoListener listener);
/**
* Removes the specified listener from the list of document undo listeners.
*
* Removing a listener which is not registered has no effect
*
*
* @param listener the document undo listener to be removed
*/
void removeDocumentUndoListener(IDocumentUndoListener listener);
/**
* Returns the undo context registered for this document
*
* @return the undo context registered for this document
*/
IUndoContext getUndoContext();
/**
* Closes the currently open text edit and open a new one.
*/
void commit();
/**
* Connects to the undo manager. Used to signify that a client is monitoring
* the history kept by the undo manager. This message has no effect if the
* client is already connected.
*
* @param client the object connecting to the undo manager
*/
void connect(Object client);
/**
* Disconnects from the undo manager. Used to signify that a client is no
* longer monitoring the history kept by the undo manager. If all clients
* have disconnected from the undo manager, the undo history will be
* deleted.
*
* @param client the object disconnecting from the undo manager
*/
void disconnect(Object client);
/**
* Signals the undo manager that all subsequent changes until
* endCompoundChange is called are to be undone in one piece.
*/
void beginCompoundChange();
/**
* Signals the undo manager that the sequence of changes which started with
* beginCompoundChange has been finished. All subsequent
* changes are considered to be individually undo-able.
*/
void endCompoundChange();
/**
* Sets the limit of the undo history to the specified value. The provided
* limit will supersede any previously set limit.
*
* @param undoLimit the length of this undo manager's history
*/
void setMaximalUndoLevel(int undoLimit);
/**
* Resets the history of the undo manager. After that call,
* there aren't any undo-able or redo-able text changes.
*/
void reset();
/**
* Returns whether at least one text change can be rolled back.
*
* @return true if at least one text change can be rolled back
*/
boolean undoable();
/**
* Returns whether at least one text change can be repeated. A text change
* can be repeated only if it was executed and rolled back.
*
* @return true if at least on text change can be repeated
*/
boolean redoable();
/**
* Rolls back the most recently executed text change.
*
* @throws ExecutionException if an exception occurred during undo
*/
void undo() throws ExecutionException;
/**
* Repeats the most recently rolled back text change.
*
* @throws ExecutionException if an exception occurred during redo
*/
void redo() throws ExecutionException;
/**
* Transfers the undo history from the specified document undo manager to
* this undo manager. This message should only be used when it is known
* that the content of the document of the original undo manager when the
* last undo operation was recorded is the same as this undo manager's
* current document content, since the undo history is based on document
* indexes. It is the responsibility of the caller
* to ensure that this call is used correctly.
*
* @param manager the document undo manger whose history is to be transferred to the receiver
*/
public void transferUndoHistory(IDocumentUndoManager manager);
}