com.moarub.util.UrlDeshortener.java Source code

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Here is the source code for com.moarub.util.UrlDeshortener.java

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/*******************************************************************************
 * Copyright (c) 2012 Moarub Oy.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Moarub Oy - initial API and implementation
 ******************************************************************************/
package com.moarub.util;

import java.io.IOException;

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpHead;
import org.apache.http.client.params.HttpClientParams;

import android.net.http.AndroidHttpClient;
import android.os.AsyncTask;
import android.util.Log;

public class UrlDeshortener extends AsyncTask<String, Void, DeshorteningResult> {
    private UrlDeshortenerListener fListener;
    private String fUrlTo;
    private int fRedirects;
    private boolean fAsync;

    public UrlDeshortener(UrlDeshortenerListener listener, int count) {
        fListener = listener;
        fRedirects = count;
    }

    @Override
    protected DeshorteningResult doInBackground(String... urls) {
        return doShortening(urls);
    }

    private DeshorteningResult doShortening(String... urls) {
        fAsync = true;
        Log.d("Deshortening", "URL " + urls[0] + "(" + fRedirects + ")");
        fUrlTo = urls[0];
        AndroidHttpClient httpClient = AndroidHttpClient.newInstance("Android ShareMore");

        HttpHead headReq = new HttpHead(fUrlTo);

        try {
            HttpResponse resp = httpClient.execute(headReq);
            String resValue = resp.getLastHeader("Location") != null ? resp.getLastHeader("Location").getValue()
                    : null;
            int statusCode = resp.getStatusLine().getStatusCode();
            return new DeshorteningResult(resValue, statusCode);
        } catch (IOException e) {
            Log.d("Deshortening", e.getMessage());
            return null;
        } finally {
            httpClient.close();
        }
    }

    @Override
    protected void onPostExecute(DeshorteningResult result) {
        handleResponse(result);
    }

    private void handleResponse(DeshorteningResult result) {
        if (result != null && result.getResValue() != null && fRedirects < 20) {

            fListener.onURLDeshortened(result.getResValue(), result.getStatusCode(), fUrlTo);
            Log.d("Deshortening", result.getResValue() + " (" + result.getStatusCode() + ")");

            if (result.getStatusCode() >= 300 && result.getStatusCode() < 400) {
                UrlDeshortener followOn = new UrlDeshortener(fListener, fRedirects + 1);
                followOn.execute(result.getResValue());
            }
            return;
        } else if (result != null) {
            if (fUrlTo != null && fAsync) {
                extractTitle(fUrlTo);
            }
            return;
        }
        fListener.onURLDeshortened(null, 700, fUrlTo);
    }

    private void extractTitle(String url) {
        PageTitleGetter pgt = new PageTitleGetter(fListener);
        String[] params = { url, url };
        pgt.execute(params);
    }

}