org.messic.android.util.RestJSONClient.java Source code

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Here is the source code for org.messic.android.util.RestJSONClient.java

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/*
 * Copyright (C) 2013
 *
 *  This file is part of Messic.
 * 
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.messic.android.util;

import java.util.Arrays;

import org.messic.android.R.string;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;

import android.os.AsyncTask;

public class RestJSONClient {

    public interface RestListener<T> {
        void response(T response);

        void fail(Exception e);
    }

    /**
     * Rest POST petition to the server at the url param, sending all the post parameters defiend at formData. This post
     * return an object (json marshalling) of class defined at clazz parameter. You should register a
     * {@link RestListener} in order to obtain the returned object, this is because the petition is done in an async
     * process.
     * 
     * @param url {@link string} URL to attack
     * @param formData {@link MultiValueMap}<?,?/> map of parameters to send
     * @param clazz Class<T/> class that you will marshall to a json object
     * @param rl {@link RestListener} listener to push the object returned
     */
    public static <T> void post(final String url, MultiValueMap<?, ?> formData, final Class<T> clazz,
            final RestListener<T> rl) {
        final RestTemplate restTemplate = new RestTemplate();
        restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());

        HttpHeaders requestHeaders = new HttpHeaders();
        requestHeaders.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
        // Sending multipart/form-data
        requestHeaders.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
        // Populate the MultiValueMap being serialized and headers in an HttpEntity object to use for the request
        final HttpEntity<MultiValueMap<?, ?>> requestEntity = new HttpEntity<MultiValueMap<?, ?>>(formData,
                requestHeaders);

        AsyncTask<Void, Void, Void> at = new AsyncTask<Void, Void, Void>() {
            @Override
            protected Void doInBackground(Void... params) {
                try {
                    ResponseEntity<T> response = restTemplate.exchange(url, HttpMethod.POST, requestEntity, clazz);
                    rl.response(response.getBody());
                } catch (Exception e) {
                    rl.fail(e);
                }
                return null;
            }

        };

        at.execute();
    }

    /**
     * Rest GET petition to the server at the url param, sending all the post parameters defiend at formData. This post
     * return an object (json marshalling) of class defined at clazz parameter. You should register a
     * {@link RestListener} in order to obtain the returned object, this is because the petition is done in an async
     * process.
     * 
     * @param url {@link string} URL to attack
     * @param clazz Class<T/> class that you will marshall to a json object
     * @param rl {@link RestListener} listener to push the object returned
     */
    public static <T> void get(final String url, final Class<T> clazz, final RestListener<T> rl) {
        final RestTemplate restTemplate = new RestTemplate();
        restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());

        HttpHeaders requestHeaders = new HttpHeaders();
        requestHeaders.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
        // Populate the MultiValueMap being serialized and headers in an HttpEntity object to use for the request
        final HttpEntity<MultiValueMap<?, ?>> requestEntity = new HttpEntity<MultiValueMap<?, ?>>(
                new LinkedMultiValueMap<String, Object>(), requestHeaders);

        AsyncTask<Void, Void, Void> at = new AsyncTask<Void, Void, Void>() {
            @Override
            protected Void doInBackground(Void... params) {
                try {
                    ResponseEntity<T> response = restTemplate.exchange(url, HttpMethod.GET, requestEntity, clazz);
                    rl.response(response.getBody());
                } catch (Exception e) {
                    rl.fail(e);
                }
                return null;
            }

        };

        at.execute();
    }
}