/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.sling.launchpad.base.impl;
import java.io.IOException;
import java.io.InputStream;
import java.net.JarURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.regex.Pattern;
import org.apache.sling.launchpad.api.LaunchpadContentProvider;
/**
* The <code>ClassLoaderResourceProvider</code> TODO
*/
public class ClassLoaderResourceProvider implements LaunchpadContentProvider {
private final ClassLoader classLoader;
public ClassLoaderResourceProvider(ClassLoader classLoader) {
this.classLoader = (classLoader != null)
? classLoader
: this.getClass().getClassLoader();
}
public Iterator<String> getChildren(String path) {
List<String> children;
// Guard against extra trailing slashes
if(path.endsWith("/") && path.length() > 1) {
path = path.substring(0, path.length()-1);
}
URL url = this.classLoader.getResource(path);
if (url != null) {
Pattern pathPattern = Pattern.compile("^" + path + "/[^/]+/?$");
children = new ArrayList<String>();
try {
URLConnection conn = url.openConnection();
if (conn instanceof JarURLConnection) {
JarFile jar = ((JarURLConnection) conn).getJarFile();
Enumeration<JarEntry> entries = jar.entries();
while (entries.hasMoreElements()) {
String entry = entries.nextElement().getName();
if (pathPattern.matcher(entry).matches()) {
children.add(entry);
}
}
}
} catch (IOException ioe) {
// ignore for now
}
} else {
children = Collections.emptyList();
}
return children.iterator();
}
public URL getResource(String path) {
// ensure path
if (path == null || path.length() == 0) {
return null;
}
// remove leading slash
if (path.charAt(0) == '/') {
path = path.substring(1);
}
return (this.classLoader != null) ? this.classLoader.getResource(path) : null;
}
public InputStream getResourceAsStream(String path) {
URL res = this.getResource(path);
if (res != null) {
try {
return res.openStream();
} catch (IOException ioe) {
// ignore this one
}
}
// no resource
return null;
}
}