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EasyMock provides an easy way to create Mock Objects for interfaces and classes generating them on the fly
/***
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000-2011 INRIA, France Telecom
* 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. Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.easymock.asm.optimizer;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.TreeSet;
import org.easymock.asm.ClassReader;
import org.easymock.asm.ClassWriter;
import org.easymock.asm.Handle;
import org.easymock.asm.Type;
import org.easymock.asm.commons.Remapper;
import org.easymock.asm.commons.SimpleRemapper;
/**
* A class file shrinker utility.
*
* @author Eric Bruneton
* @author Eugene Kuleshov
*/
public class Shrinker {
static final HashMap MAPPING = new HashMap();
public static void main(final String[] args) throws IOException {
Properties properties = new Properties();
int n = args.length - 1;
for (int i = 0; i < n - 1; ++i) {
properties.load(new FileInputStream(args[i]));
}
for (Map.Entry entry : properties.entrySet()) {
MAPPING.put((String) entry.getKey(), (String) entry.getValue());
}
final Set unused = new HashSet(MAPPING.keySet());
File f = new File(args[n - 1]);
File d = new File(args[n]);
optimize(f, d, new SimpleRemapper(MAPPING) {
@Override
public String map(String key) {
String s = super.map(key);
if (s != null) {
unused.remove(key);
}
return s;
}
});
Iterator i = unused.iterator();
while (i.hasNext()) {
String s = i.next();
if (!s.endsWith("/remove")) {
System.out.println("INFO: unused mapping " + s);
}
}
}
static void optimize(final File f, final File d, final Remapper remapper)
throws IOException {
if (f.isDirectory()) {
File[] files = f.listFiles();
for (int i = 0; i < files.length; ++i) {
optimize(files[i], d, remapper);
}
} else if (f.getName().endsWith(".class")) {
ConstantPool cp = new ConstantPool();
ClassReader cr = new ClassReader(new FileInputStream(f));
ClassWriter cw = new ClassWriter(0);
ClassConstantsCollector ccc = new ClassConstantsCollector(cw, cp);
ClassOptimizer co = new ClassOptimizer(ccc, remapper);
cr.accept(co, ClassReader.SKIP_DEBUG);
Set constants = new TreeSet(
new ConstantComparator());
constants.addAll(cp.values());
cr = new ClassReader(cw.toByteArray());
cw = new ClassWriter(0);
Iterator i = constants.iterator();
while (i.hasNext()) {
Constant c = i.next();
c.write(cw);
}
cr.accept(cw, ClassReader.SKIP_DEBUG);
if (MAPPING.get(cr.getClassName() + "/remove") != null) {
return;
}
String n = remapper.mapType(cr.getClassName());
File g = new File(d, n + ".class");
if (!g.exists() || g.lastModified() < f.lastModified()) {
if (!g.getParentFile().exists() && !g.getParentFile().mkdirs()) {
throw new IOException("Cannot create directory "
+ g.getParentFile());
}
OutputStream os = new FileOutputStream(g);
try {
os.write(cw.toByteArray());
} finally {
os.close();
}
}
}
}
static class ConstantComparator implements Comparator {
public int compare(final Constant c1, final Constant c2) {
int d = getSort(c1) - getSort(c2);
if (d == 0) {
switch (c1.type) {
case 'I':
return new Integer(c1.intVal).compareTo(new Integer(
c2.intVal));
case 'J':
return new Long(c1.longVal).compareTo(new Long(c2.longVal));
case 'F':
return new Float(c1.floatVal).compareTo(new Float(
c2.floatVal));
case 'D':
return new Double(c1.doubleVal).compareTo(new Double(
c2.doubleVal));
case 's':
case 'S':
case 'C':
case 't':
return c1.strVal1.compareTo(c2.strVal1);
case 'T':
d = c1.strVal1.compareTo(c2.strVal1);
if (d == 0) {
d = c1.strVal2.compareTo(c2.strVal2);
}
break;
case 'y':
d = c1.strVal1.compareTo(c2.strVal1);
if (d == 0) {
d = c1.strVal2.compareTo(c2.strVal2);
if (d == 0) {
Handle bsm1 = (Handle) c1.objVal3;
Handle bsm2 = (Handle) c2.objVal3;
d = compareHandle(bsm1, bsm2);
if (d == 0) {
d = compareObjects(c1.objVals, c2.objVals);
}
}
}
break;
default:
d = c1.strVal1.compareTo(c2.strVal1);
if (d == 0) {
d = c1.strVal2.compareTo(c2.strVal2);
if (d == 0) {
d = ((String) c1.objVal3)
.compareTo((String) c2.objVal3);
}
}
}
}
return d;
}
private static int compareHandle(Handle h1, Handle h2) {
int d = h1.getTag() - h2.getTag();
if (d == 0) {
d = h1.getOwner().compareTo(h2.getOwner());
if (d == 0) {
d = h1.getName().compareTo(h2.getName());
if (d == 0) {
d = h1.getDesc().compareTo(h2.getDesc());
}
}
}
return d;
}
private static int compareType(Type mtype1, Type mtype2) {
return mtype1.getDescriptor().compareTo(mtype2.getDescriptor());
}
private static int compareObjects(Object[] objVals1, Object[] objVals2) {
int length = objVals1.length;
int d = length - objVals2.length;
if (d == 0) {
for (int i = 0; i < length; i++) {
Object objVal1 = objVals1[i];
Object objVal2 = objVals2[i];
d = objVal1.getClass().getName()
.compareTo(objVal2.getClass().getName());
if (d == 0) {
if (objVal1 instanceof Type) {
d = compareType((Type) objVal1, (Type) objVal2);
} else if (objVal1 instanceof Handle) {
d = compareHandle((Handle) objVal1,
(Handle) objVal2);
} else {
d = ((Comparable) objVal1).compareTo(objVal2);
}
}
if (d != 0) {
return d;
}
}
}
return 0;
}
private static int getSort(final Constant c) {
switch (c.type) {
case 'I':
return 0;
case 'J':
return 1;
case 'F':
return 2;
case 'D':
return 3;
case 's':
return 4;
case 'S':
return 5;
case 'C':
return 6;
case 'T':
return 7;
case 'G':
return 8;
case 'M':
return 9;
case 'N':
return 10;
case 'y':
return 11;
case 't':
return 12;
default:
return 100 + c.type - 'h';
}
}
}
}