/*
* Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.tools.classfile;
import java.util.Map;
import com.sun.tools.classfile.ConstantPool.CONSTANT_Class_info;
import com.sun.tools.classfile.ConstantPool.CONSTANT_Double_info;
import com.sun.tools.classfile.ConstantPool.CONSTANT_Fieldref_info;
import com.sun.tools.classfile.ConstantPool.CONSTANT_Float_info;
import com.sun.tools.classfile.ConstantPool.CONSTANT_Integer_info;
import com.sun.tools.classfile.ConstantPool.CONSTANT_InterfaceMethodref_info;
import com.sun.tools.classfile.ConstantPool.CONSTANT_InvokeDynamic_info;
import com.sun.tools.classfile.ConstantPool.CONSTANT_Long_info;
import com.sun.tools.classfile.ConstantPool.CONSTANT_MethodHandle_info;
import com.sun.tools.classfile.ConstantPool.CONSTANT_MethodType_info;
import com.sun.tools.classfile.ConstantPool.CONSTANT_Methodref_info;
import com.sun.tools.classfile.ConstantPool.CONSTANT_NameAndType_info;
import com.sun.tools.classfile.ConstantPool.CONSTANT_String_info;
import com.sun.tools.classfile.ConstantPool.CONSTANT_Utf8_info;
import com.sun.tools.classfile.ConstantPool.CPInfo;
/**
* Rewrites a class file using a map of translations.
*
* <p><b>This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.</b>
*/
public class ClassTranslator
implements ConstantPool.Visitor<ConstantPool.CPInfo,Map<Object,Object>> {
/**
* Create a new ClassFile from {@code cf}, such that for all entries
* {@code k -\> v} in {@code translations},
* each occurrence of {@code k} in {@code cf} will be replaced by {@code v}.
* in
* @param cf the class file to be processed
* @param translations the set of translations to be applied
* @return a copy of {@code} with the values in {@code translations} substituted
*/
public ClassFile translate(ClassFile cf, Map<Object,Object> translations) {
ClassFile cf2 = (ClassFile) translations.get(cf);
if (cf2 == null) {
ConstantPool constant_pool2 = translate(cf.constant_pool, translations);
Field[] fields2 = translate(cf.fields, cf.constant_pool, translations);
Method[] methods2 = translateMethods(cf.methods, cf.constant_pool, translations);
Attributes attributes2 = translateAttributes(cf.attributes, cf.constant_pool,
translations);
if (constant_pool2 == cf.constant_pool &&
fields2 == cf.fields &&
methods2 == cf.methods &&
attributes2 == cf.attributes)
cf2 = cf;
else
cf2 = new ClassFile(
cf.magic,
cf.minor_version,
cf.major_version,
constant_pool2,
cf.access_flags,
cf.this_class,
cf.super_class,
cf.interfaces,
fields2,
methods2,
attributes2);
translations.put(cf, cf2);
}
return cf2;
}
ConstantPool translate(ConstantPool cp, Map<Object,Object> translations) {
ConstantPool cp2 = (ConstantPool) translations.get(cp);
if (cp2 == null) {
ConstantPool.CPInfo[] pool2 = new ConstantPool.CPInfo[cp.size()];
boolean eq = true;
for (int i = 0; i < cp.size(); ) {
ConstantPool.CPInfo cpInfo;
try {
cpInfo = cp.get(i);
} catch (ConstantPool.InvalidIndex e) {
throw new IllegalStateException(e);
}
ConstantPool.CPInfo cpInfo2 = translate(cpInfo, translations);
eq &= (cpInfo == cpInfo2);
pool2[i] = cpInfo2;
if (cpInfo.getTag() != cpInfo2.getTag())
throw new IllegalStateException();
i += cpInfo.size();
}
if (eq)
cp2 = cp;
else
cp2 = new ConstantPool(pool2);
translations.put(cp, cp2);
}
return cp2;
}
ConstantPool.CPInfo translate(ConstantPool.CPInfo cpInfo, Map<Object,Object> translations) {
ConstantPool.CPInfo cpInfo2 = (ConstantPool.CPInfo) translations.get(cpInfo);
if (cpInfo2 == null) {
cpInfo2 = cpInfo.accept(this, translations);
translations.put(cpInfo, cpInfo2);
}
return cpInfo2;
}
Field[] translate(Field[] fields, ConstantPool constant_pool, Map<Object,Object> translations) {
Field[] fields2 = (Field[]) translations.get(fields);
if (fields2 == null) {
fields2 = new Field[fields.length];
for (int i = 0; i < fields.length; i++)
fields2[i] = translate(fields[i], constant_pool, translations);
if (equal(fields, fields2))
fields2 = fields;
translations.put(fields, fields2);
}
return fields2;
}
Field translate(Field field, ConstantPool constant_pool, Map<Object,Object> translations) {
Field field2 = (Field) translations.get(field);
if (field2 == null) {
Attributes attributes2 = translateAttributes(field.attributes, constant_pool,
translations);
if (attributes2 == field.attributes)
field2 = field;
else
field2 = new Field(
field.access_flags,
field.name_index,
field.descriptor,
attributes2);
translations.put(field, field2);
}
return field2;
}
Method[] translateMethods(Method[] methods, ConstantPool constant_pool, Map<Object,Object> translations) {
Method[] methods2 = (Method[]) translations.get(methods);
if (methods2 == null) {
methods2 = new Method[methods.length];
for (int i = 0; i < methods.length; i++)
methods2[i] = translate(methods[i], constant_pool, translations);
if (equal(methods, methods2))
methods2 = methods;
translations.put(methods, methods2);
}
return methods2;
}
Method translate(Method method, ConstantPool constant_pool, Map<Object,Object> translations) {
Method method2 = (Method) translations.get(method);
if (method2 == null) {
Attributes attributes2 = translateAttributes(method.attributes, constant_pool,
translations);
if (attributes2 == method.attributes)
method2 = method;
else
method2 = new Method(
method.access_flags,
method.name_index,
method.descriptor,
attributes2);
translations.put(method, method2);
}
return method2;
}
Attributes translateAttributes(Attributes attributes,
ConstantPool constant_pool, Map<Object,Object> translations) {
Attributes attributes2 = (Attributes) translations.get(attributes);
if (attributes2 == null) {
Attribute[] attrArray2 = new Attribute[attributes.size()];
ConstantPool constant_pool2 = translate(constant_pool, translations);
boolean attrsEqual = true;
for (int i = 0; i < attributes.size(); i++) {
Attribute attr = attributes.get(i);
Attribute attr2 = translate(attr, translations);
if (attr2 != attr)
attrsEqual = false;
attrArray2[i] = attr2;
}
if ((constant_pool2 == constant_pool) && attrsEqual)
attributes2 = attributes;
else
attributes2 = new Attributes(constant_pool2, attrArray2);
translations.put(attributes, attributes2);
}
return attributes2;
}
Attribute translate(Attribute attribute, Map<Object,Object> translations) {
Attribute attribute2 = (Attribute) translations.get(attribute);
if (attribute2 == null) {
attribute2 = attribute; // don't support translation within attributes yet
// (what about Code attribute)
translations.put(attribute, attribute2);
}
return attribute2;
}
private static <T> boolean equal(T[] a1, T[] a2) {
if (a1 == null || a2 == null)
return (a1 == a2);
if (a1.length != a2.length)
return false;
for (int i = 0; i < a1.length; i++) {
if (a1[i] != a2[i])
return false;
}
return true;
}
public CPInfo visitClass(CONSTANT_Class_info info, Map<Object, Object> translations) {
CONSTANT_Class_info info2 = (CONSTANT_Class_info) translations.get(info);
if (info2 == null) {
ConstantPool cp2 = translate(info.cp, translations);
if (cp2 == info.cp)
info2 = info;
else
info2 = new CONSTANT_Class_info(cp2, info.name_index);
translations.put(info, info2);
}
return info;
}
public CPInfo visitDouble(CONSTANT_Double_info info, Map<Object, Object> translations) {
CONSTANT_Double_info info2 = (CONSTANT_Double_info) translations.get(info);
if (info2 == null) {
info2 = info;
translations.put(info, info2);
}
return info;
}
public CPInfo visitFieldref(CONSTANT_Fieldref_info info, Map<Object, Object> translations) {
CONSTANT_Fieldref_info info2 = (CONSTANT_Fieldref_info) translations.get(info);
if (info2 == null) {
ConstantPool cp2 = translate(info.cp, translations);
if (cp2 == info.cp)
info2 = info;
else
info2 = new CONSTANT_Fieldref_info(cp2, info.class_index, info.name_and_type_index);
translations.put(info, info2);
}
return info;
}
public CPInfo visitFloat(CONSTANT_Float_info info, Map<Object, Object> translations) {
CONSTANT_Float_info info2 = (CONSTANT_Float_info) translations.get(info);
if (info2 == null) {
info2 = info;
translations.put(info, info2);
}
return info;
}
public CPInfo visitInteger(CONSTANT_Integer_info info, Map<Object, Object> translations) {
CONSTANT_Integer_info info2 = (CONSTANT_Integer_info) translations.get(info);
if (info2 == null) {
info2 = info;
translations.put(info, info2);
}
return info;
}
public CPInfo visitInterfaceMethodref(CONSTANT_InterfaceMethodref_info info, Map<Object, Object> translations) {
CONSTANT_InterfaceMethodref_info info2 = (CONSTANT_InterfaceMethodref_info) translations.get(info);
if (info2 == null) {
ConstantPool cp2 = translate(info.cp, translations);
if (cp2 == info.cp)
info2 = info;
else
info2 = new CONSTANT_InterfaceMethodref_info(cp2, info.class_index, info.name_and_type_index);
translations.put(info, info2);
}
return info;
}
public CPInfo visitInvokeDynamic(CONSTANT_InvokeDynamic_info info, Map<Object, Object> translations) {
CONSTANT_InvokeDynamic_info info2 = (CONSTANT_InvokeDynamic_info) translations.get(info);
if (info2 == null) {
ConstantPool cp2 = translate(info.cp, translations);
if (cp2 == info.cp) {
info2 = info;
} else {
info2 = new CONSTANT_InvokeDynamic_info(cp2, info.bootstrap_method_attr_index, info.name_and_type_index);
}
translations.put(info, info2);
}
return info;
}
public CPInfo visitLong(CONSTANT_Long_info info, Map<Object, Object> translations) {
CONSTANT_Long_info info2 = (CONSTANT_Long_info) translations.get(info);
if (info2 == null) {
info2 = info;
translations.put(info, info2);
}
return info;
}
public CPInfo visitNameAndType(CONSTANT_NameAndType_info info, Map<Object, Object> translations) {
CONSTANT_NameAndType_info info2 = (CONSTANT_NameAndType_info) translations.get(info);
if (info2 == null) {
ConstantPool cp2 = translate(info.cp, translations);
if (cp2 == info.cp)
info2 = info;
else
info2 = new CONSTANT_NameAndType_info(cp2, info.name_index, info.type_index);
translations.put(info, info2);
}
return info;
}
public CPInfo visitMethodref(CONSTANT_Methodref_info info, Map<Object, Object> translations) {
CONSTANT_Methodref_info info2 = (CONSTANT_Methodref_info) translations.get(info);
if (info2 == null) {
ConstantPool cp2 = translate(info.cp, translations);
if (cp2 == info.cp)
info2 = info;
else
info2 = new CONSTANT_Methodref_info(cp2, info.class_index, info.name_and_type_index);
translations.put(info, info2);
}
return info;
}
public CPInfo visitMethodHandle(CONSTANT_MethodHandle_info info, Map<Object, Object> translations) {
CONSTANT_MethodHandle_info info2 = (CONSTANT_MethodHandle_info) translations.get(info);
if (info2 == null) {
ConstantPool cp2 = translate(info.cp, translations);
if (cp2 == info.cp) {
info2 = info;
} else {
info2 = new CONSTANT_MethodHandle_info(cp2, info.reference_kind, info.reference_index);
}
translations.put(info, info2);
}
return info;
}
public CPInfo visitMethodType(CONSTANT_MethodType_info info, Map<Object, Object> translations) {
CONSTANT_MethodType_info info2 = (CONSTANT_MethodType_info) translations.get(info);
if (info2 == null) {
ConstantPool cp2 = translate(info.cp, translations);
if (cp2 == info.cp) {
info2 = info;
} else {
info2 = new CONSTANT_MethodType_info(cp2, info.descriptor_index);
}
translations.put(info, info2);
}
return info;
}
public CPInfo visitString(CONSTANT_String_info info, Map<Object, Object> translations) {
CONSTANT_String_info info2 = (CONSTANT_String_info) translations.get(info);
if (info2 == null) {
ConstantPool cp2 = translate(info.cp, translations);
if (cp2 == info.cp)
info2 = info;
else
info2 = new CONSTANT_String_info(cp2, info.string_index);
translations.put(info, info2);
}
return info;
}
public CPInfo visitUtf8(CONSTANT_Utf8_info info, Map<Object, Object> translations) {
CONSTANT_Utf8_info info2 = (CONSTANT_Utf8_info) translations.get(info);
if (info2 == null) {
info2 = info;
translations.put(info, info2);
}
return info;
}
}