/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.model.document;
import org.waveprotocol.wave.model.util.ReadableStringMap;
/**
* An object that represents an interval of an AnnotationSet.
*
* An interval is a maximal range of an AnnotationSet in which all items have
* the same annotations. Intervals are always nonempty.
*
* @author ohler@google.com (Christian Ohler)
*
* @param <V> the type of values in the AnnotationSet
*/
public interface AnnotationInterval<V> {
/** The index of the first item of this interval. */
int start();
/** The index beyond the last item of this interval. */
int end();
/** The length of this interval. */
int length();
/**
* The annotations in this interval.
*/
ReadableStringMap<V> annotations();
/**
* The annotations in this interval whose values differ from the previous
* interval.
*
* If this interval is the first interval returned during an iteration,
* the return value of this method is defined as follows: If the iteration
* started at index 0, it will contain the same entries as the return value of
* annotations(). If the iteration started at an index greater than 0, it
* will contain the differences from the annotations at the index prior to
* the start of the iteration.
*
* This may throw an UnsupportedOperationException if this AnnotationInterval
* was not returned by a left-to-right iteration.
*/
ReadableStringMap<V> diffFromLeft();
}