/**
* Copyright 2008 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.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())
+ ")";
}
}