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/*******************************************************************************
* Copyright (c) 2009, 2019 Mountainminds GmbH & Co. KG and Contributors
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Marc R. Hoffmann - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.test;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
/**
* Loads given classes from a byte arrays.
*/
public class TargetLoader extends ClassLoader {
private final Map<String, byte[]> classes;
public TargetLoader() {
super(TargetLoader.class.getClassLoader());
this.classes = new HashMap<String, byte[]>();
}
public Class<?> add(final String name, final byte[] bytes) {
this.classes.put(name, bytes);
return load(name);
}
public Class<?> add(final Class<?> name, final byte[] bytes) {
return add(name.getName(), bytes);
}
private Class<?> load(final String sourcename) {
try {
return loadClass(sourcename);
} catch (ClassNotFoundException e) {
// must not happen
throw new RuntimeException(e);
}
}
public static InputStream getClassData(Class<?> clazz) {
return getClassData(clazz.getClassLoader(), clazz.getName());
}
public static InputStream getClassData(ClassLoader loader, String name) {
final String resource = name.replace('.', '/') + ".class";
return loader.getResourceAsStream(resource);
}
public static byte[] getClassDataAsBytes(ClassLoader loader, String name)
throws IOException {
return readBytes(getClassData(loader, name));
}
public static byte[] getClassDataAsBytes(Class<?> clazz) throws IOException {
return readBytes(getClassData(clazz));
}
private static byte[] readBytes(InputStream in) throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buffer = new byte[0x100];
int len;
while ((len = in.read(buffer)) != -1) {
out.write(buffer, 0, len);
}
in.close();
return out.toByteArray();
}
@Override
protected synchronized Class<?> loadClass(String name, boolean resolve)
throws ClassNotFoundException {
final byte[] bytes = classes.get(name);
if (bytes != null) {
Class<?> c = defineClass(name, bytes, 0, bytes.length);
if (resolve) {
resolveClass(c);
}
return c;
}
return super.loadClass(name, resolve);
}
}
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