/*
* Copyright 2012 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.
*/
package com.google.zxing.client.android.result.supplement;
import android.widget.TextView;
import com.google.zxing.client.android.HttpHelper;
import com.google.zxing.client.android.history.HistoryManager;
import com.google.zxing.client.result.URIParsedResult;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Retrieves the title of a web page as supplemental info.
*
* @author Sean Owen
*/
final class TitleRetriever extends SupplementalInfoRetriever {
private static final Pattern TITLE_PATTERN = Pattern.compile("<title>([^<]+)");
private static final int MAX_TITLE_LEN = 100;
private final String httpUrl;
TitleRetriever(TextView textView, URIParsedResult result, HistoryManager historyManager) {
super(textView, historyManager);
this.httpUrl = result.getURI();
}
@Override
void retrieveSupplementalInfo() {
CharSequence contents;
try {
contents = HttpHelper.downloadViaHttp(httpUrl, HttpHelper.ContentType.HTML, 4096);
} catch (IOException ioe) {
// ignore this
return;
}
if (contents != null && contents.length() > 0) {
Matcher m = TITLE_PATTERN.matcher(contents);
if (m.find()) {
String title = m.group(1);
if (title != null && title.length() > 0) {
if (title.length() > MAX_TITLE_LEN) {
title = title.substring(0, MAX_TITLE_LEN) + "...";
}
append(httpUrl, null, new String[] {title}, httpUrl);
}
}
}
}
}