/*
* Janino - An embedded Java[TM] compiler
*
* Copyright (c) 2001-2010, Arno Unkrig
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
* following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the
* following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package org.codehaus.janino;
import java.io.*;
import java.util.*;
import org.codehaus.janino.tools.Disassembler;
/**
* This {@link ClassLoader} allows for the loading of a set of Java™ classes
* provided in class file format.
*/
public class ByteArrayClassLoader extends ClassLoader {
private static final boolean DEBUG = false;
/**
* The given {@link Map} of classes must not be modified afterwards.
*
* @param classes String className => byte[] data
*/
public ByteArrayClassLoader(Map classes) {
this.classes = classes;
}
/**
* @see #ByteArrayClassLoader(Map)
*/
public ByteArrayClassLoader(Map classes, ClassLoader parent) {
super(parent);
this.classes = classes;
}
/**
* Implements {@link ClassLoader#findClass(String)}.
* <p>
* Notice that, although nowhere documented, no more than one thread at a time calls this
* method, because {@link ClassLoader#loadClass(java.lang.String)} is
* <code>synchronized</code>.
*/
protected Class findClass(String name) throws ClassNotFoundException {
byte[] data = (byte[]) this.classes.get(name);
if (data == null) throw new ClassNotFoundException(name);
if (DEBUG) {
System.out.println("*** Disassembly of class \"" + name + "\":");
try {
new Disassembler().disasm(new ByteArrayInputStream(data));
System.out.flush();
} catch (IOException ex) {
throw new JaninoRuntimeException("SNO: IOException despite ByteArrayInputStream");
}
}
// Notice: Not inheriting the protection domain will cause problems with Java Web Start /
// JNLP. See
// http://jira.codehaus.org/browse/JANINO-104
// http://www.nabble.com/-Help-jel--java.security.AccessControlException-to13073723.html
return super.defineClass(
name, // name
data, 0, data.length, // b, off, len
this.getClass().getProtectionDomain() // protectionDomain
);
}
/**
* An object is regarded equal to <code>this</code> iff
* <ul>
* <li>It is also an instance of {@link ByteArrayClassLoader}
* <li>Both have the same parent {@link ClassLoader}
* <li>Exactly the same classes (name, bytecode) were added to both
* </ul>
* Roughly speaking, equal {@link ByteArrayClassLoader}s will return functionally identical
* {@link Class}es on {@link ClassLoader#loadClass(java.lang.String)}.
*/
public boolean equals(Object o) {
if (!(o instanceof ByteArrayClassLoader)) return false;
if (this == o) return true;
ByteArrayClassLoader that = (ByteArrayClassLoader) o;
{
final ClassLoader parentOfThis = this.getParent();
final ClassLoader parentOfThat = that.getParent();
if (parentOfThis == null ? parentOfThat != null : !parentOfThis.equals(parentOfThat)) return false;
}
if (this.classes.size() != that.classes.size()) return false;
for (Iterator it = this.classes.entrySet().iterator(); it.hasNext();) {
Map.Entry me = (Map.Entry) it.next();
byte[] ba = (byte[]) that.classes.get(me.getKey());
if (ba == null) return false; // Key missing in "that".
if (!Arrays.equals((byte[]) me.getValue(), ba)) return false; // Byte arrays differ.
}
return true;
}
public int hashCode() {
int hc = this.getParent().hashCode();
for (Iterator it = this.classes.entrySet().iterator(); it.hasNext();) {
Map.Entry me = (Map.Entry) it.next();
hc ^= me.getKey().hashCode();
byte[] ba = (byte[]) me.getValue();
for (int i = 0; i < ba.length; ++i) {
hc = (31 * hc) ^ ba[i];
}
}
return hc;
}
private final Map classes; // String className => byte[] data
}