/**
* 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.supplement;
import org.waveprotocol.wave.model.util.Pair;
/**
* Holds the state that records a user action of collapsing or expanding a
* thread. Specifically, a pair of the state into which the thread was put, and
* the wavelet version at which it was put into that state.
*
*/
public final class PrimitiveThreadState extends Pair<ThreadState, Integer> implements
Comparable<PrimitiveThreadState> {
private PrimitiveThreadState(ThreadState state, Integer version) {
super(state, version);
}
public static PrimitiveThreadState of(ThreadState state, Integer version) {
return new PrimitiveThreadState(state, version);
}
public static PrimitiveThreadState expanded(int version) {
return new PrimitiveThreadState(ThreadState.EXPANDED, version);
}
public static PrimitiveThreadState collapsed(int version) {
return new PrimitiveThreadState(ThreadState.COLLAPSED, version);
}
public ThreadState getState() {
return getFirst();
}
public Integer getVersion() {
return getSecond();
}
@Override
public int compareTo(PrimitiveThreadState o) {
Integer thisVersion = getVersion();
Integer otherVersion = o.getVersion();
if (thisVersion == null && otherVersion == null) {
return 0;
} else if (thisVersion == null) {
// Other is better than this one.
return 1;
} else if (otherVersion == null) {
// Other is worse than this one.
return -1;
} else {
return thisVersion.compareTo(otherVersion);
}
}
}