001    /**
002     * Copyright (C) 2009-2011 the original author or authors.
003     * See the notice.md file distributed with this work for additional
004     * information regarding copyright ownership.
005     *
006     * Licensed under the Apache License, Version 2.0 (the "License");
007     * you may not use this file except in compliance with the License.
008     * You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    
019    package org.fusesource.restygwt.client;
020    
021    import com.google.gwt.core.client.GWT;
022    import com.google.gwt.core.client.JavaScriptObject;
023    import com.google.gwt.json.client.JSONObject;
024    import com.google.gwt.user.client.rpc.AsyncCallback;
025    
026    /**
027     *
028     * @author <a href="http://blog.mkristian.tk>Kristian</a>
029     */
030    public abstract class AbstractAsyncCallback<T> implements AsyncCallback<JavaScriptObject> {
031    
032        protected final JsonpMethod method;
033    
034        protected MethodCallback<T> callback;
035    
036        public AbstractAsyncCallback(JsonpMethod method, MethodCallback<T> callback) {
037            this.method = method;
038            this.callback = callback;
039        }
040    
041        @Override
042        final public void onFailure(Throwable exception) {
043            callback.onFailure(this.method, exception);
044        }
045    
046        @Override
047        final public void onSuccess(JavaScriptObject result) {
048            try {
049                GWT.log("Received http response for jsonp request", null);
050                JSONObject json = new JSONObject(result); 
051                GWT.log(json.toString(), null);
052                callback.onSuccess(this.method, parseResult(json));
053            } catch (Throwable e) {
054                GWT.log("Could not parse response: " + e, e);
055                callback.onFailure(this.method, e);
056                return;
057            }
058        }
059    
060        abstract protected T parseResult(JSONObject result) throws Exception;
061    }