com.gmail.at.faint545.tasks.HistoryActionTask.java Source code

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Here is the source code for com.gmail.at.faint545.tasks.HistoryActionTask.java

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/* 
 * Copyright 2011 Alex Fu
 * 
 * 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.gmail.at.faint545.tasks;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

import android.os.AsyncTask;
import android.support.v4.app.Fragment;

import com.gmail.at.faint545.SabnzbdConstants;
import com.gmail.at.faint545.fragments.HistoryFragment;

public class HistoryActionTask extends AsyncTask<String, Void, String> {
    private String url;
    private String api;
    private int request;
    private Fragment fragment;

    public static final int DELETE = HistoryFragment.DELETE;
    public static final int RETRY = DELETE >> 1;

    public interface HistoryActionTaskListener {
        public void onHistoryDeleteFinished(String result);

        public void onHistoryRetryFinished(String result);
    }

    public HistoryActionTask(Fragment fragment, String url, String api, int request) {
        this.fragment = fragment;
        this.url = url;
        this.request = request;
        this.api = api;
    }

    @Override
    protected String doInBackground(String... params) {
        HttpClient httpClient = new DefaultHttpClient();
        HttpPost httpRequest = new HttpPost(url);
        ArrayList<NameValuePair> arguments = new ArrayList<NameValuePair>();
        arguments.add(new BasicNameValuePair(SabnzbdConstants.APIKEY, api));
        arguments.add(new BasicNameValuePair(SabnzbdConstants.OUTPUT, SabnzbdConstants.OUTPUT_JSON));

        switch (request) {
        case DELETE:
            prepareForDelete(arguments, params);
            break;
        case RETRY:
            prepareForRetry(arguments, params);
            break;
        }

        try {
            httpRequest.setEntity(new UrlEncodedFormEntity(arguments));
            HttpResponse result = httpClient.execute(httpRequest);
            InputStream inStream = result.getEntity().getContent();
            BufferedReader br = new BufferedReader(new InputStreamReader(inStream), 8);
            StringBuilder jsonStringBuilder = new StringBuilder();
            String line;
            while ((line = br.readLine()) != null) {
                if (line.length() > 0)
                    jsonStringBuilder.append(line);
            }
            br.close();
            inStream.close();
            return jsonStringBuilder.toString();
        } catch (ClientProtocolException e) {
            return ClientProtocolException.class.getName();
        } catch (IOException e) {
            return IOException.class.getName();
        }
    }

    @Override
    protected void onPostExecute(String result) {
        HistoryActionTaskListener listener = (HistoryActionTaskListener) fragment;
        switch (request) {
        case DELETE:
            listener.onHistoryDeleteFinished(result);
            break;
        case RETRY:
            listener.onHistoryRetryFinished(result);
            break;
        }
        cleanup();
        super.onPostExecute(result);
    }

    private void cleanup() {
        fragment = null;
        url = null;
        api = null;
    }

    private void prepareForDelete(ArrayList<NameValuePair> arguments, String... params) {
        String value = (params[0] == null) ? SabnzbdConstants.ALL : params[0];

        arguments.add(new BasicNameValuePair(SabnzbdConstants.MODE, SabnzbdConstants.MODE_HISTORY));
        arguments.add(new BasicNameValuePair(SabnzbdConstants.NAME, SabnzbdConstants.DELETE));
        arguments.add(new BasicNameValuePair(SabnzbdConstants.VALUE, value));
    }

    private void prepareForRetry(ArrayList<NameValuePair> arguments, String... params) {
        arguments.add(new BasicNameValuePair(SabnzbdConstants.MODE, SabnzbdConstants.MODE_RETRY));
        arguments.add(new BasicNameValuePair(SabnzbdConstants.VALUE, params[0]));
    }
}