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/*******************************************************************************
* Copyright (c) 2000, 2007 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.text.edits;
/**
* A visitor for text edits.
*
* For each different concrete text edit type T there is a method:
*
* public boolean visit(T node) - Visits the given edit to
* perform some arbitrary operation. If true is returned, the given edit's
* child edits will be visited next; however, if false is returned, the
* given edit's child edits will not be visited. The default implementation provided by
* this class calls a generic method visitNode(TextEdit node).
* Subclasses may reimplement these method as needed.
*
*
* In addition, there are methods for visiting text edits in the
* abstract, regardless of node type:
*
* public void preVisit(TextEdit edit) - Visits
* the given edit to perform some arbitrary operation.
* This method is invoked prior to the appropriate type-specific
* visit method.
* The default implementation of this method does nothing.
* Subclasses may reimplement this method as needed.public void postVisit(TextEdit edit) - Visits
* the given edit to perform some arbitrary operation.
* This method is invoked after the appropriate type-specific
* endVisit method.
* The default implementation of this method does nothing.
* Subclasses may reimplement this method as needed.
*
*
* For edits with children, the child nodes are visited in increasing order.
*
*
* @see TextEdit#accept(TextEditVisitor)
* @since 3.0
*/
public class TextEditVisitor {
/**
* Visits the given text edit prior to the type-specific visit.
* (before visit).
*
* The default implementation does nothing. Subclasses may reimplement.
*
*
* @param edit the node to visit
*/
public void preVisit(TextEdit edit) {
// default implementation: do nothing
}
/**
* Visits the given text edit following the type-specific visit
* (after endVisit).
*
* The default implementation does nothing. Subclasses may reimplement.
*
*
* @param edit the node to visit
*/
public void postVisit(TextEdit edit) {
// default implementation: do nothing
}
/**
* Visits the given text edit. This method is called by default from
* type-specific visits. It is not called by an edit's accept method.
* The default implementation returns true.
*
* @param edit the node to visit
* @return If true is returned, the given node's child
* nodes will be visited next; however, if false is
* returned, the given node's child nodes will not be visited.
*/
public boolean visitNode(TextEdit edit) {
return true;
}
/**
* Visits a CopySourceEdit instance.
*
* @param edit the node to visit
* @return If true is returned, the given node's child
* nodes will be visited next; however, if false is
* returned, the given node's child nodes will not be visited.
*/
public boolean visit(CopySourceEdit edit) {
return visitNode(edit);
}
/**
* Visits a CopyTargetEdit instance.
*
* @param edit the node to visit
* @return If true is returned, the given node's child
* nodes will be visited next; however, if false is
* returned, the given node's child nodes will not be visited.
*/
public boolean visit(CopyTargetEdit edit) {
return visitNode(edit);
}
/**
* Visits a MoveSourceEdit instance.
*
* @param edit the node to visit
* @return If true is returned, the given node's child
* nodes will be visited next; however, if false is
* returned, the given node's child nodes will not be visited.
*/
public boolean visit(MoveSourceEdit edit) {
return visitNode(edit);
}
/**
* Visits a MoveTargetEdit instance.
*
* @param edit the node to visit
* @return If true is returned, the given node's child
* nodes will be visited next; however, if false is
* returned, the given node's child nodes will not be visited.
*/
public boolean visit(MoveTargetEdit edit) {
return visitNode(edit);
}
/**
* Visits a RangeMarker instance.
*
* @param edit the node to visit
* @return If true is returned, the given node's child
* nodes will be visited next; however, if false is
* returned, the given node's child nodes will not be visited.
*/
public boolean visit(RangeMarker edit) {
return visitNode(edit);
}
/**
* Visits a CopyingRangeMarker instance.
*
* @param edit the node to visit
* @return If true is returned, the given node's child
* nodes will be visited next; however, if false is
* returned, the given node's child nodes will not be visited.
*/
public boolean visit(CopyingRangeMarker edit) {
return visitNode(edit);
}
/**
* Visits a DeleteEdit instance.
*
* @param edit the node to visit
* @return If true is returned, the given node's child
* nodes will be visited next; however, if false is
* returned, the given node's child nodes will not be visited.
*/
public boolean visit(DeleteEdit edit) {
return visitNode(edit);
}
/**
* Visits a InsertEdit instance.
*
* @param edit the node to visit
* @return If true is returned, the given node's child
* nodes will be visited next; however, if false is
* returned, the given node's child nodes will not be visited.
*/
public boolean visit(InsertEdit edit) {
return visitNode(edit);
}
/**
* Visits a ReplaceEdit instance.
*
* @param edit the node to visit
* @return If true is returned, the given node's child
* nodes will be visited next; however, if false is
* returned, the given node's child nodes will not be visited.
*/
public boolean visit(ReplaceEdit edit) {
return visitNode(edit);
}
/**
* Visits a UndoEdit instance.
*
* @param edit the node to visit
* @return If true is returned, the given node's child
* nodes will be visited next; however, if false is
* returned, the given node's child nodes will not be visited.
*/
public boolean visit(UndoEdit edit) {
return visitNode(edit);
}
/**
* Visits a MultiTextEdit instance.
*
* @param edit the node to visit
* @return If true is returned, the given node's child
* nodes will be visited next; however, if false is
* returned, the given node's child nodes will not be visited.
*/
public boolean visit(MultiTextEdit edit) {
return visitNode(edit);
}
}