ASM: a very small and fast Java bytecode manipulation framework
Copyright (c) 2000-2011 INRIA, France Telecom
All rights reserved.
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modification, are permitted provided that the following conditions
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   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.
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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/***
 * 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.objectweb.asm.commons;

import org.objectweb.asm.Handle;
import org.objectweb.asm.Type;
import org.objectweb.asm.signature.SignatureReader;
import org.objectweb.asm.signature.SignatureVisitor;
import org.objectweb.asm.signature.SignatureWriter;

A class responsible for remapping types and names. Subclasses can override
the following methods:

map(String) - map type
mapFieldName(String, String, String) - map field name
mapMethodName(String, String, String) - map method name

Author:
Eugene Kuleshov/**
 * A class responsible for remapping types and names. Subclasses can override
 * the following methods:
 * 
 * <ul>
 * <li>{@link #map(String)} - map type</li>
 * <li>{@link #mapFieldName(String, String, String)} - map field name</li>
 * <li>{@link #mapMethodName(String, String, String)} - map method name</li>
 * </ul>
 * 
 * @author Eugene Kuleshov
 */
public abstract class Remapper {

    public String mapDesc(String desc) {
        Type t = Type.getType(desc);
        switch (t.getSort()) {
        case Type.ARRAY:
            String s = mapDesc(t.getElementType().getDescriptor());
            for (int i = 0; i < t.getDimensions(); ++i) {
                s = '[' + s;
            }
            return s;
        case Type.OBJECT:
            String newType = map(t.getInternalName());
            if (newType != null) {
                return 'L' + newType + ';';
            }
        }
        return desc;
    }

    private Type mapType(Type t) {
        switch (t.getSort()) {
        case Type.ARRAY:
            String s = mapDesc(t.getElementType().getDescriptor());
            for (int i = 0; i < t.getDimensions(); ++i) {
                s = '[' + s;
            }
            return Type.getType(s);
        case Type.OBJECT:
            s = map(t.getInternalName());
            return s != null ? Type.getObjectType(s) : t;
        case Type.METHOD:
            return Type.getMethodType(mapMethodDesc(t.getDescriptor()));
        }
        return t;
    }

    public String mapType(String type) {
        if (type == null) {
            return null;
        }
        return mapType(Type.getObjectType(type)).getInternalName();
    }

    public String[] mapTypes(String[] types) {
        String[] newTypes = null;
        boolean needMapping = false;
        for (int i = 0; i < types.length; i++) {
            String type = types[i];
            String newType = map(type);
            if (newType != null && newTypes == null) {
                newTypes = new String[types.length];
                if (i > 0) {
                    System.arraycopy(types, 0, newTypes, 0, i);
                }
                needMapping = true;
            }
            if (needMapping) {
                newTypes[i] = newType == null ? type : newType;
            }
        }
        return needMapping ? newTypes : types;
    }

    public String mapMethodDesc(String desc) {
        if ("()V".equals(desc)) {
            return desc;
        }

        Type[] args = Type.getArgumentTypes(desc);
        StringBuffer s = new StringBuffer("(");
        for (int i = 0; i < args.length; i++) {
            s.append(mapDesc(args[i].getDescriptor()));
        }
        Type returnType = Type.getReturnType(desc);
        if (returnType == Type.VOID_TYPE) {
            s.append(")V");
            return s.toString();
        }
        s.append(')').append(mapDesc(returnType.getDescriptor()));
        return s.toString();
    }

    public Object mapValue(Object value) {
        if (value instanceof Type) {
            return mapType((Type) value);
        }
        if (value instanceof Handle) {
            Handle h = (Handle) value;
            return new Handle(h.getTag(), mapType(h.getOwner()), mapMethodName(
                    h.getOwner(), h.getName(), h.getDesc()),
                    mapMethodDesc(h.getDesc()));
        }
        return value;
    }

    
Params:
typeSignature – 
           true if signature is a FieldTypeSignature, such as the
           signature parameter of the ClassVisitor.visitField or
           MethodVisitor.visitLocalVariable methods/**
     * 
     * @param typeSignature
     *            true if signature is a FieldTypeSignature, such as the
     *            signature parameter of the ClassVisitor.visitField or
     *            MethodVisitor.visitLocalVariable methods
     */
    public String mapSignature(String signature, boolean typeSignature) {
        if (signature == null) {
            return null;
        }
        SignatureReader r = new SignatureReader(signature);
        SignatureWriter w = new SignatureWriter();
        SignatureVisitor a = createRemappingSignatureAdapter(w);
        if (typeSignature) {
            r.acceptType(a);
        } else {
            r.accept(a);
        }
        return w.toString();
    }

    protected SignatureVisitor createRemappingSignatureAdapter(
            SignatureVisitor v) {
        return new RemappingSignatureAdapter(v, this);
    }

    
Map method name to the new name. Subclasses can override.
Params:
owner – 
           owner of the method.
name – 
           name of the method.
desc – 
           descriptor of the method.
Returns:
new name of the method/**
     * Map method name to the new name. Subclasses can override.
     * 
     * @param owner
     *            owner of the method.
     * @param name
     *            name of the method.
     * @param desc
     *            descriptor of the method.
     * @return new name of the method
     */
    public String mapMethodName(String owner, String name, String desc) {
        return name;
    }

    
Map invokedynamic method name to the new name. Subclasses can override.
Params:
name – 
           name of the invokedynamic.
desc – 
           descriptor of the invokedynamic.
Returns:
new invokdynamic name./**
     * Map invokedynamic method name to the new name. Subclasses can override.
     * 
     * @param name
     *            name of the invokedynamic.
     * @param desc
     *            descriptor of the invokedynamic.
     * @return new invokdynamic name.
     */
    public String mapInvokeDynamicMethodName(String name, String desc) {
        return name;
    }

    
Map field name to the new name. Subclasses can override.
Params:
owner – 
           owner of the field.
name – 
           name of the field
desc – 
           descriptor of the field
Returns:
new name of the field./**
     * Map field name to the new name. Subclasses can override.
     * 
     * @param owner
     *            owner of the field.
     * @param name
     *            name of the field
     * @param desc
     *            descriptor of the field
     * @return new name of the field.
     */
    public String mapFieldName(String owner, String name, String desc) {
        return name;
    }

    
Map type name to the new name. Subclasses can override.
/**
     * Map type name to the new name. Subclasses can override.
     */
    public String map(String typeName) {
        return typeName;
    }
}