/**
* Copyright 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.waveprotocol.wave.client.editor.content;
import org.waveprotocol.wave.model.document.util.FocusedPointRange;
import org.waveprotocol.wave.model.document.util.Point;
import org.waveprotocol.wave.model.util.Preconditions;
/**
* Convenience type alias
*
* @author danilatos@google.com (Daniel Danilatos)
*/
public class FocusedContentRange extends FocusedPointRange<ContentNode>{
private ContentRange orderedRange;
private boolean isOrdered;
/**
* @param anchor
* @param focus
*/
public FocusedContentRange(Point<ContentNode> anchor, Point<ContentNode> focus) {
super(anchor, focus);
}
/**
* @param collapsedAt
*/
public FocusedContentRange(Point<ContentNode> collapsedAt) {
super(collapsedAt);
}
/**
* Returns this range as an ordered range.
*
* Ordered means that the focus comes after the anchor (or they are the same)
*
* @param isOrdered redundant variable - it is a function of the range's
* focus and anchor. However, the check is expensive, and so instead we
* rely on the caller to know if the range is ordered or not, and ensure
* the correctness of the isOrdered parameter.
* @return an ordered range
*/
public ContentRange asOrderedRange(boolean isOrdered) {
if (orderedRange == null) {
orderedRange = isOrdered
? new ContentRange(getAnchor(), getFocus())
: new ContentRange(getFocus(), getAnchor());
this.isOrdered = isOrdered;
} else {
Preconditions.checkState(isOrdered == this.isOrdered,
"Different isOrdered input from last time");
}
return orderedRange;
}
}