au.org.ala.fielddata.mobile.service.WebServiceClient.java Source code

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Here is the source code for au.org.ala.fielddata.mobile.service.WebServiceClient.java

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/*******************************************************************************
 * Copyright (C) 2010 Atlas of Living Australia
 * All Rights Reserved.
 *  
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (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.mozilla.org/MPL/
 *  
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 ******************************************************************************/
package au.org.ala.fielddata.mobile.service;

import java.io.Closeable;
import java.net.HttpURLConnection;

import org.springframework.http.converter.FormHttpMessageConverter;
import org.springframework.http.converter.json.GsonHttpMessageConverter;
import org.springframework.web.client.RestTemplate;

import android.content.Context;
import android.util.Log;
import au.org.ala.fielddata.mobile.pref.Preferences;
import au.org.ala.fielddata.mobile.service.dto.Mapper;

import com.google.gson.Gson;

public class WebServiceClient {
    protected Preferences preferences;
    protected Context ctx;

    public WebServiceClient(Context ctx) {
        this.ctx = ctx;
        preferences = new Preferences(ctx);
        // This shouldn't be necessary however I am seeing frequent failures
        // due to recycled closed connections (possibly something I am doing
        // wrong).  This is working around that.
        System.setProperty("http.keepAlive", "false");
    }

    public String getServerUrl() {
        return preferences.getFieldDataServerUrl();
    }

    /**
     * The FieldData web services tend to accept regular HTTP parameters, some of which are JSON encoded.
     * 
     */
    protected RestTemplate getRestTemplate() {

        RestTemplate restTemplate = new RestTemplate();
        FormHttpMessageConverter formConverter = new FormHttpMessageConverter();
        GsonHttpMessageConverter gsonConverter = new GsonHttpMessageConverter(getGson());
        formConverter.addPartConverter(gsonConverter);
        restTemplate.getMessageConverters().add(formConverter);
        restTemplate.getMessageConverters().add(gsonConverter);

        return restTemplate;
    }

    protected Gson getGson() {
        return Mapper.getGson(ctx, true);
    }

    protected void close(Closeable stream) {
        if (stream != null) {
            try {
                stream.close();
            } catch (Exception e) {
                Log.e("WebServiceClient", "Error closing stream: ", e);
            }
        }
    }

    protected void close(HttpURLConnection connection) {
        if (connection != null) {
            try {
                connection.disconnect();
            } catch (Exception e) {
                Log.e("WebServiceClient", "Error closing connection: ", e);
            }
        }
    }
}