com.teleca.jamendo.api.util.Caller.java Source code

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Here is the source code for com.teleca.jamendo.api.util.Caller.java

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/*
 * Copyright (C) 2009 Teleca Poland Sp. z o.o. <android@teleca.com>
 *
 * 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.teleca.jamendo.api.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.SocketException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.UnknownHostException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.util.Log;

import com.teleca.jamendo.JamendoApplication;
import com.teleca.jamendo.api.WSError;

/**
 * @author Lukasz Wisniewski
 */
public class Caller {

    /**
     * Cache for most recent request
     */
    private static RequestCache requestCache = null;

    /**
     * Performs HTTP GET using Apache HTTP Client v 4
     * 
     * @param url
     * @return
     * @throws WSError 
     */
    public static String doGet(String url) throws WSError {

        String data = null;
        if (requestCache != null) {
            data = requestCache.get(url);
            if (data != null) {
                Log.d(JamendoApplication.TAG, "Caller.doGet [cached] " + url);
                return data;
            }
        }

        URI encodedUri = null;
        HttpGet httpGet = null;

        try {
            encodedUri = new URI(url);
            httpGet = new HttpGet(encodedUri);
        } catch (URISyntaxException e1) {
            // at least try to remove spaces
            String encodedUrl = url.replace(' ', '+');
            httpGet = new HttpGet(encodedUrl);
            e1.printStackTrace();
        }

        // initialize HTTP GET request objects
        HttpClient httpClient = new DefaultHttpClient();
        HttpResponse httpResponse;

        try {
            // execute request
            try {
                httpResponse = httpClient.execute(httpGet);
            } catch (UnknownHostException e) {
                throw new WSError("Unable to access " + e.getLocalizedMessage());
            } catch (SocketException e) {
                throw new WSError(e.getLocalizedMessage());
            }

            // request data
            HttpEntity httpEntity = httpResponse.getEntity();

            if (httpEntity != null) {
                InputStream inputStream = httpEntity.getContent();
                data = convertStreamToString(inputStream);
                // cache the result
                if (requestCache != null) {
                    requestCache.put(url, data);
                }
            }

        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        Log.d(JamendoApplication.TAG, "Caller.doGet " + url);
        return data;
    }

    private static String convertStreamToString(InputStream is) {

        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();

        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        return sb.toString();
    }

    public static void setRequestCache(RequestCache requestCache) {
        Caller.requestCache = requestCache;
    }

    public static String createStringFromIds(int[] ids) {
        if (ids == null)
            return "";

        String query = "";

        for (int id : ids) {
            query = query + id + "+";
        }

        return query;
    }

}