/*******************************************************************************
* Copyright (c) 2001, 2005 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
* Jens Lukowski/Innoopract - initial renaming/restructuring
*
*******************************************************************************/
package org.eclipse.wst.sse.core.internal.text;
import org.eclipse.jface.text.BadPositionCategoryException;
import org.eclipse.jface.text.DefaultPositionUpdater;
/**
* Follows the behavior of DefaultPositionUpdater except in addition to
* deleting/overwriting text which completely contains the position deletes
* the position, deleting text that equals the text in position also deletes
* the position.
*
* @see org.eclipse.jface.text.DefaultPositionUpdater
*/
public class DeleteEqualPositionUpdater extends DefaultPositionUpdater {
/**
* @param category
*/
public DeleteEqualPositionUpdater(String category) {
super(category);
}
/**
* Determines whether the currently investigated position has been deleted
* by the replace operation specified in the current event. If so, it
* deletes the position and removes it from the document's position
* category.
*
* NOTE: position is deleted if current event completely overwrites
* position OR if current event deletes the area surrounding/including the
* position
*
* @return <code>true</code> if position has been deleted
*/
protected boolean notDeleted() {
// position is deleted if current event completely overwrites position
// OR if
// current event deletes the area surrounding/including the position
if ((fOffset < fPosition.offset && (fPosition.offset + fPosition.length < fOffset + fLength)) || (fOffset <= fPosition.offset && (fPosition.offset + fPosition.length <= fOffset + fLength) && fReplaceLength == 0)) {
fPosition.delete();
try {
fDocument.removePosition(getCategory(), fPosition);
} catch (BadPositionCategoryException x) {
}
return false;
}
return true;
}
}