/**
* 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.util;
import org.waveprotocol.wave.model.util.Preconditions;
/**
* An immutable range of two locations integers
*/
public final class Range {
private final int start;
private final int end;
/**
* Construct a range
*
* @param start
* @param end
*/
public Range(int start, int end) {
if (start < 0 || start > end) {
Preconditions.illegalArgument("Bad range: (" + start + ", " + end + ")");
}
this.start = start;
this.end = end;
}
/**
* Construct a collapsed range
*
* @param collapsedAt
*/
public Range(int collapsedAt) {
this(collapsedAt, collapsedAt);
}
/**
* @return start point
*/
public int getStart() {
return start;
}
/**
* @return end point
*/
public int getEnd() {
return end;
}
/**
* @return true if the range is collapsed
*/
public boolean isCollapsed() {
return start == end;
}
/**
* {@inheritDoc}
*/
@Override
public int hashCode() {
return start + 37 * end;
}
/**
* {@inheritDoc}
*/
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (!(obj instanceof Range)) return false;
final Range other = (Range) obj;
if (end != other.end) return false;
if (start != other.start) return false;
return true;
}
/**
* {@inheritDoc}
*/
@Override
public String toString() {
return "Range(" + getStart()
+ (isCollapsed() ? "" : "-" + getEnd())
+ ")";
}
}