/*
* Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package com.sun.tools.visualvm.modules.customtype.icons;
import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.imageio.ImageIO;
/**
*
* @author Jaroslav Bachorik
*/
class IconResolver {
final private static Pattern favicoLinkPattern = Pattern.compile("\\<link(.+?)/?\\>", Pattern.MULTILINE | Pattern.DOTALL);
final private static Pattern favicoHrefPattern = Pattern.compile("href=[\\\"'](.+?)[\\\"']", Pattern.MULTILINE | Pattern.DOTALL);
final private static String[] extensions = new String[]{"png", "gif", "jpg", "jpeg"};
BufferedImage resolveIcon(URL url) {
BufferedImage resolvedImage = null;
for (String extension : extensions) {
String favIcon = "favicon." + extension;
try {
URL favicoUrl = new URL(url.toString() + "/" + favIcon);
resolvedImage = ImageIO.read(favicoUrl);
if (resolvedImage != null && resolvedImage.getWidth() > -1) {
break;
}
} catch (IOException ex) {
// ignore
}
}
if (resolvedImage == null) {
resolvedImage = resolveFromLink(url);
}
return resolvedImage != null ? (resolvedImage.getWidth() > -1 ? resolvedImage : null) : null;
}
private synchronized BufferedImage resolveFromLink(URL url) {
try {
String index = readIndex(url.openStream());
Matcher linkMatcher = favicoLinkPattern.matcher(index);
String favicoPath = null;
while (linkMatcher.find()) {
String content = linkMatcher.group(1);
if (content.contains("shortcut") || content.contains("icon")) {
Matcher hrefMatcher = favicoHrefPattern.matcher(content);
if (hrefMatcher.find()) {
favicoPath = hrefMatcher.group(1);
if (isSupported(favicoPath)) {
break;
} else {
favicoPath = null;
}
}
}
}
if (favicoPath != null) {
URL favicoUrl = null;
if (favicoPath.startsWith("/")) { // absolute path
favicoUrl = new URL(url.getProtocol(), url.getHost(), favicoPath);
} else {
favicoUrl = new URL(url.getProtocol(), url.getHost(), url.getFile() + "/" + favicoPath);
}
Logger.getLogger(IconResolver.class.getName()).fine("Resolving image: " + favicoUrl.toString());
return ImageIO.read(favicoUrl);
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
private String readIndex(InputStream is) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
do {
line = br.readLine();
if (line != null) {
sb.append(line).append('\n');
}
} while (line != null);
} finally {
try {
is.close();
} catch (IOException e) {
}
}
return sb.toString();
}
private boolean isSupported(String imagePath) {
int jsIndex = imagePath.indexOf(";");
if (jsIndex > -1) {
imagePath = imagePath.substring(0, jsIndex);
}
for (String ext : extensions) {
if (imagePath.endsWith(ext)) {
return true;
}
}
return false;
}
}