ca.upei.ic.timetable.client.Remote.java Source code

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Here is the source code for ca.upei.ic.timetable.client.Remote.java

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/*
 *  Copyright 2008 University of Prince Edward Island
 *
 *  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 ca.upei.ic.timetable.client;

import java.util.Map;

import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.RequestBuilder;
import com.google.gwt.http.client.RequestCallback;
import com.google.gwt.http.client.RequestException;

/**
 * Access remote services.
 *  
 * @author felix
 */
public class Remote {
    private String url_;

    private Request currentRequest_;

    public Remote(String url) {
        url_ = url;
    }

    /**
     * Calls a remote method using HTTP GET
     * 
     * @param method
     * @param params
     * @param callback
     */
    public Request get(String method, Map<String, String> params, RequestCallback callback) {
        // build the query
        StringBuffer q = new StringBuffer();
        q.append("?method=" + method);

        if (null != params) {
            for (String key : params.keySet()) {
                q.append("&" + key + "=" + params.get(key));
            }
        }

        // build the request builder
        RequestBuilder req = new RequestBuilder(RequestBuilder.GET, url_ + q);

        req.setRequestData("");
        req.setCallback(callback);
        Request request = null;
        try {
            request = req.send();
        } catch (RequestException re) {
            callback.onError(request, re);
        }
        return request;
    }

    /**
     * Calls a remote method using HTTP POST
     * 
     * @param method
     * @param contentType
     * @param data
     * @param callback
     */
    public Request post(String method, String contentType, String data, RequestCallback callback) {
        StringBuffer q = new StringBuffer();
        q.append("?method=" + method);

        RequestBuilder req = new RequestBuilder(RequestBuilder.POST, url_ + q);

        req.setHeader("Content-type", contentType);
        req.setRequestData(data);
        req.setCallback(callback);
        Request request = null;
        try {
            request = req.send();
        } catch (RequestException re) {
            callback.onError(request, re);
        }
        return request;
    }
}