/**
* Copyright 2010 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.client.wavepanel.view.impl;
import org.waveprotocol.wave.client.wavepanel.view.IntrinsicParticipantsView;
import org.waveprotocol.wave.client.wavepanel.view.ParticipantView;
import org.waveprotocol.wave.client.wavepanel.view.ParticipantsView;
import org.waveprotocol.wave.model.conversation.Conversation;
import org.waveprotocol.wave.model.wave.ParticipantId;
/**
* Implements a participants-collection view by delegating primitive state
* matters to a view object, and structural state matters to a helper. The
* intent is that the helper is a flyweight handler.
*
* @param <I> intrinsic participants implementation
*/
public final class ParticipantsViewImpl<I extends IntrinsicParticipantsView> // \u2620
extends AbstractStructuredView<ParticipantsViewImpl.Helper<? super I>, I> // \u2620
implements ParticipantsView {
/**
* Handles structural queries on participants views.
*
* @param <I> intrinsic participants implementation
*/
public interface Helper<I> {
ParticipantView append(I impl, Conversation conv, ParticipantId participant);
void remove(I impl);
}
public ParticipantsViewImpl(Helper<? super I> helper, I impl) {
super(helper, impl);
}
@Override
public Type getType() {
return Type.PARTICIPANTS;
}
@Override
public ParticipantView appendParticipant(Conversation conv, ParticipantId participant) {
return helper.append(impl, conv, participant);
}
@Override
public void remove() {
helper.remove(impl);
}
@Override
public String getId() {
return impl.getId();
}
}