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/*******************************************************************************
* Copyright (c) 2000, 2007 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.jface.text;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.eclipse.core.runtime.Assert;
/**
* Event describing the change of document partitionings.
*
* @see org.eclipse.jface.text.IDocumentExtension3
* @since 3.0
*/
public class DocumentPartitioningChangedEvent {
/** The document whose partitionings changed */
private final IDocument fDocument;
/** The map of partitionings to changed regions. */
private final Map<String, Region> fMap= new HashMap<>();
/**
* Creates a new document partitioning changed event for the given document.
* Initially this event is empty, i.e. does not describe any change.
*
* @param document the changed document
*/
public DocumentPartitioningChangedEvent(IDocument document) {
fDocument= document;
}
/**
* Returns the changed document.
*
* @return the changed document
*/
public IDocument getDocument() {
return fDocument;
}
/**
* Returns the changed region of the given partitioning or <code>null</code>
* if the given partitioning did not change.
*
* @param partitioning the partitioning
* @return the changed region of the given partitioning or <code>null</code>
*/
public IRegion getChangedRegion(String partitioning) {
return fMap.get(partitioning);
}
/**
* Returns the set of changed partitionings.
*
* @return the set of changed partitionings
*/
public String[] getChangedPartitionings() {
String[] partitionings= new String[fMap.size()];
fMap.keySet().toArray(partitionings);
return partitionings;
}
/**
* Sets the specified range as changed region for the given partitioning.
*
* @param partitioning the partitioning
* @param offset the region offset
* @param length the region length
*/
public void setPartitionChange(String partitioning, int offset, int length) {
Assert.isNotNull(partitioning);
fMap.put(partitioning, new Region(offset, length));
}
/**
* Returns <code>true</code> if the set of changed partitionings is empty,
* <code>false</code> otherwise.
*
* @return <code>true</code> if the set of changed partitionings is empty
*/
public boolean isEmpty() {
return fMap.isEmpty();
}
/**
* Returns the coverage of this event. This is the minimal region that
* contains all changed regions of all changed partitionings.
*
* @return the coverage of this event
*/
public IRegion getCoverage() {
if (fMap.isEmpty())
return new Region(0, 0);
int offset= -1;
int endOffset= -1;
Iterator<Region> e= fMap.values().iterator();
while (e.hasNext()) {
IRegion r= e.next();
if (offset < 0 || r.getOffset() < offset)
offset= r.getOffset();
int end= r.getOffset() + r.getLength();
if (end > endOffset)
endOffset= end;
}
return new Region(offset, endOffset - offset);
}
}
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