Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright 2011 ZXing authors
 *
 * 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.
 */

import java.io.IOException;

import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;

import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;

public class Main {
    private static final Collection<String> REDIRECTOR_DOMAINS = new HashSet<String>(
            Arrays.asList("amzn.to", "bit.ly", "bitly.com", "fb.me", "goo.gl", "is.gd", "j.mp", "lnkd.in", "ow.ly",
                    "R.BEETAGG.COM", "r.beetagg.com", "SCN.BY", "su.pr", "t.co", "tinyurl.com", "tr.im"));

    public static URI unredirect(URI uri) throws IOException {
        if (!REDIRECTOR_DOMAINS.contains(uri.getHost())) {
            return uri;
        }
        URL url = uri.toURL();

        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setInstanceFollowRedirects(false);
        connection.setDoInput(false);
        connection.setRequestMethod("HEAD");
        connection.setRequestProperty("User-Agent", "ZXing (Android)");
        try {
            connection.connect();
            switch (connection.getResponseCode()) {
            case HttpURLConnection.HTTP_MULT_CHOICE:
            case HttpURLConnection.HTTP_MOVED_PERM:
            case HttpURLConnection.HTTP_MOVED_TEMP:
            case HttpURLConnection.HTTP_SEE_OTHER:
            case 307: // No constant for 307 Temporary Redirect ?
                String location = connection.getHeaderField("Location");
                if (location != null) {
                    try {
                        return new URI(location);
                    } catch (URISyntaxException e) {
                        // nevermind
                    }
                }
            }
            return uri;
        } finally {
            connection.disconnect();
        }
    }
}