/**
* 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.operation.core;
import org.waveprotocol.wave.model.operation.OperationException;
import org.waveprotocol.wave.model.wave.ParticipantId;
import org.waveprotocol.wave.model.wave.data.core.CoreWaveletData;
/**
* Operation class for the add-participant operation.
*/
public final class CoreAddParticipant extends CoreWaveletOperation {
/** Participant to add. */
private final ParticipantId participant;
/**
* Creates an add-participant operation.
*
* @param participant participant to add
*/
public CoreAddParticipant(ParticipantId participant) {
if (participant == null) {
throw new NullPointerException("Null participant ID");
}
this.participant = participant;
}
/**
* Gets the participant to add.
*
* @return the participant to add.
*/
public ParticipantId getParticipantId() {
return participant;
}
/**
* Adds a participant from the given wavelet.
*/
@Override
public void doApply(CoreWaveletData target) throws OperationException {
if (!target.addParticipant(participant)) {
throw new OperationException("Attempt to add a duplicate participant.");
}
}
@Override
public CoreWaveletOperation getInverse() {
return new CoreRemoveParticipant(participant);
}
@Override
public String toString() {
return "AddParticipant(" + participant + ")";
}
@Override
public int hashCode() {
return participant.hashCode();
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof CoreAddParticipant)) {
return false;
}
CoreAddParticipant other = (CoreAddParticipant) obj;
return participant.equals(other.participant);
}
}