/**
* 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.box.server.rpc.render.view.impl;
/**
* Implements a structural view by delegating primitive state matters to an
* intrinsic view object, and structural state matters to a helper. The intent
* is that the helper is a flyweight handler.
*
* @param <I> intrinsic view implementation
* @param <H> flyweight handler
*/
public abstract class AbstractStructuredView<H, I> {
protected final H helper;
protected final I impl;
public AbstractStructuredView(H helper, I impl) {
this.helper = helper;
this.impl = impl;
}
/** Reveals the intrinsic view object. */
public final I getIntrinsic() {
return impl;
}
//
// Equality.
//
@Override
public final boolean equals(Object obj) {
if (this == obj) {
return true;
} else if (!(obj instanceof AbstractStructuredView<?, ?>)) {
return false;
} else {
return impl.equals(((AbstractStructuredView<?, ?>) obj).impl);
}
}
@Override
public final int hashCode() {
return 37 + 11 * impl.hashCode();
}
}