/*
* Copyright 2015 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
*
* 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.drools.verifier.jarloader;
import org.drools.core.rule.MapBackedClassLoader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Collection;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;
public class VerifierMapBackedClassLoader extends MapBackedClassLoader {
public VerifierMapBackedClassLoader(Collection<JarInputStream> jarInputStreams) throws IOException {
super(createClassLoader(null));
initialize(jarInputStreams);
}
private static ClassLoader createClassLoader(ClassLoader classLoader) {
if (classLoader == null) {
classLoader = Thread.currentThread().getContextClassLoader();
if (classLoader == null) {
classLoader = VerifierMapBackedClassLoader.class.getClassLoader();
}
}
return classLoader;
}
private void initialize(Collection<JarInputStream> jarInputStreams) throws IOException {
for (JarInputStream jarInputStream : jarInputStreams) {
readJarEntriesToClassLoader(jarInputStream);
}
}
private void readJarEntriesToClassLoader(JarInputStream jarInputStream) throws IOException {
byte[] buf = new byte[1024];
int len;
JarEntry entry;
while ((entry = jarInputStream.getNextJarEntry()) != null) {
if (isValidClassEntry(entry)) {
ByteArrayOutputStream out = new ByteArrayOutputStream();
while ((len = jarInputStream.read(buf)) >= 0) {
out.write(buf,
0,
len);
}
addResource(entry.getName(),
out.toByteArray());
out.close();
}
}
}
private boolean isValidClassEntry(JarEntry entry) {
return !entry.isDirectory() && entry.getName().endsWith(".class");
}
}