com.acme.gwt.server.TvViewerJsonBootstrap.java Source code

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Here is the source code for com.acme.gwt.server.TvViewerJsonBootstrap.java

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/**
 *  Copyright 2011 Colin Alworth
 * 
 *  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.acme.gwt.server;

import java.io.UnsupportedEncodingException;
import java.util.ArrayList;

import com.acme.gwt.data.TvViewer;
import com.acme.gwt.shared.TvViewerProxy;
import com.google.gwt.autobean.shared.AutoBean;
import com.google.gwt.autobean.shared.AutoBeanCodex;
import com.google.gwt.autobean.shared.AutoBeanUtils;
import com.google.gwt.autobean.shared.Splittable;
import com.google.gwt.requestfactory.server.ServiceLayer;
import com.google.gwt.requestfactory.server.SimpleRequestProcessor;
import com.google.gwt.requestfactory.shared.DefaultProxyStore;
import com.google.gwt.requestfactory.shared.impl.MessageFactoryHolder;
import com.google.gwt.requestfactory.shared.messages.IdMessage;
import com.google.gwt.requestfactory.shared.messages.IdMessage.Strength;
import com.google.gwt.requestfactory.shared.messages.InvocationMessage;
import com.google.gwt.requestfactory.shared.messages.MessageFactory;
import com.google.gwt.requestfactory.shared.messages.OperationMessage;
import com.google.gwt.requestfactory.shared.messages.RequestMessage;
import com.google.gwt.requestfactory.shared.messages.ResponseMessage;
import com.google.gwt.user.server.Base64Utils;
import com.google.inject.Inject;
import com.google.inject.Provider;

/**
 * @author colin
 *
 */
public class TvViewerJsonBootstrap {
    @Inject
    InjectableServiceLayerDecorator isld;
    @Inject
    Provider<TvViewer> viewerProvider;

    public String getViewerAsJson() {
        SimpleRequestProcessor p = new SimpleRequestProcessor(ServiceLayer.create(isld));
        TvViewer user = viewerProvider.get();
        if (user == null) {
            return "";
        }

        MessageFactory factory = MessageFactoryHolder.FACTORY;
        AutoBean<IdMessage> id = factory.id();
        try {
            id.as().setServerId(Base64Utils.toBase64(user.getId().toString().getBytes("UTF-8")));
        } catch (UnsupportedEncodingException e) {
            return "";
        }
        id.as().setStrength(Strength.PERSISTED);
        id.as().setTypeToken(TvViewerProxy.class.getName());

        AutoBean<RequestMessage> msg = factory.request();
        msg.as().setInvocations(new ArrayList<InvocationMessage>());
        InvocationMessage invocation = factory.invocation().as();
        invocation.setOperation("com.google.gwt.requestfactory.shared.impl.FindRequest::find");
        invocation.setParameters(new ArrayList<Splittable>());
        invocation.getParameters().add(AutoBeanCodex.encode(id));
        msg.as().getInvocations().add(invocation);

        String value = p.process(AutoBeanCodex.encode(msg).getPayload());

        ResponseMessage response = AutoBeanCodex.decode(factory, ResponseMessage.class, value).as();
        OperationMessage opMsg = response.getOperations().get(0);
        DefaultProxyStore store = new DefaultProxyStore();
        store.put(TvViewerProxy.STORE_KEY, AutoBeanCodex.encode(AutoBeanUtils.getAutoBean(opMsg)));

        return store.encode();
    }
}