org.nightcode.gwt.selectio.client.requestfactory.ItemRequestJson.java Source code

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Here is the source code for org.nightcode.gwt.selectio.client.requestfactory.ItemRequestJson.java

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/*
 * Copyright (C) 2012 The NightCode Open Source Project
 *
 * 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.nightcode.gwt.selectio.client.requestfactory;

import org.nightcode.gwt.selectio.client.jso.ItemPageJso;
import org.nightcode.gwt.selectio.shared.ItemPageProxy;

import com.google.gwt.json.client.JSONNumber;
import com.google.gwt.json.client.JSONObject;
import com.google.gwt.json.client.JSONString;
import com.google.web.bindery.requestfactory.shared.Receiver;
import com.google.web.bindery.requestfactory.shared.RequestTransport;
import com.google.web.bindery.requestfactory.shared.ServerFailure;

/**
 * Json implementation of ItemRequest.
 */
public class ItemRequestJson implements SelectorRequestFactory.ItemRequest {

    private final SelectorRequestFactory selectorRequestFactory;

    public ItemRequestJson(SelectorRequestFactory selectorRequestFactory) {
        this.selectorRequestFactory = selectorRequestFactory;
    }

    @Override
    public Request<ItemPageProxy> getItems(final String query, final int start, final int length) {
        final JSONObject requestObject = new JSONObject();

        if (query != null) {
            requestObject.put("query", new JSONString(query));
        }
        requestObject.put("start", new JSONNumber(start));
        requestObject.put("length", new JSONNumber(length));

        return new Request<ItemPageProxy>() {
            @Override
            public void fire(final Receiver<? super ItemPageProxy> receiver) {
                selectorRequestFactory.getRequestTransport().send(requestObject.toString(),
                        new RequestTransport.TransportReceiver() {
                            @Override
                            public void onTransportSuccess(String payload) {
                                ItemPageProxy itemPage = ItemPageJso.itemPageFromJson(payload);
                                itemPage.setQuery(query);
                                itemPage.setStart(start);
                                itemPage.setLength(length);
                                receiver.onSuccess(itemPage);
                            }

                            @Override
                            public void onTransportFailure(ServerFailure failure) {
                                receiver.onFailure(failure);
                            }
                        });
            }
        };
    }
}