user/src/com/google/gwt/requestfactory/client/impl/AbstractJsonObjectRequest.java

/*
 * 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 com.google.gwt.requestfactory.client.impl;

import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.requestfactory.shared.EntityProxy;
import com.google.gwt.requestfactory.shared.ProxyRequest;
import com.google.gwt.requestfactory.shared.SyncResult;

import java.util.Set;

/**
 * <p> <span style="color:red">Experimental API: This class is still under rapid
 * development, and is very likely to be deleted. Use it at your own risk.
 * </span> </p> Abstract implementation of {@link com.google.gwt.requestfactory.shared.RequestObject
 * RequestFactory.RequestObject} for requests that return single instances of
 * {@link EntityProxy}.
 *
 * @param <T> the type of entities returned
 * @param <R> this request type
 */
public abstract class //
    AbstractJsonObjectRequest<T extends EntityProxy, R extends AbstractJsonObjectRequest<T, R>> //
    extends AbstractRequest<T, R> implements ProxyRequest<T> {

  protected final ProxySchema<?> schema;

  public AbstractJsonObjectRequest(ProxySchema<? extends T> schema,
      RequestFactoryJsonImpl requestService) {
    super(requestService);
    this.schema = schema;
  }

  @Override
  public void handleResult(Object result, Set<SyncResult> syncResults) {
    JavaScriptObject rawJso = (JavaScriptObject) result;
    ProxyJsoImpl jso = ProxyJsoImpl.create(rawJso, schema, requestFactory);
    
    ProxyJsoImpl oldJso = requestFactory.getValueStore().putInValueStore(jso);
    if (oldJso != null) {
      jso = oldJso;
    }

    /*
     * schema really should be ProxySchema<? extends T>, and then this cast
     * wouldn't be necessary. But that tickles a bug in javac:
     * http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6437894
     */
    @SuppressWarnings("unchecked")
    T proxy = (T) schema.create(jso);
    receiver.onSuccess(proxy, syncResults);
  }
}