Package br.com.caelum.vraptor.asm.commons

Source Code of br.com.caelum.vraptor.asm.commons.Remapper

/***
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000-2007 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 br.com.caelum.vraptor.asm.commons;

import br.com.caelum.vraptor.asm.Type;
import br.com.caelum.vraptor.asm.signature.SignatureReader;
import br.com.caelum.vraptor.asm.signature.SignatureVisitor;
import br.com.caelum.vraptor.asm.signature.SignatureWriter;

/**
* 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(final 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(final 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());
            if (s != null) {
                return Type.getObjectType(s);
            }
        }
        return t;
    }

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

    public String[] mapTypes(final 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(final String desc) {
        if ("()V".equals(desc)) {
            return desc;
        }

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

    public Object mapValue(final Object value) {
        return value instanceof Type ? mapType((Type) value) : value;
    }

    /**
     *
     * @param typeSignature
     *            true if signature is a FieldTypeSignature, such as the
     *            signature parameter of the ClassVisitor.visitField or
     *            MethodVisitor.visitLocalVariable methods
     */
    public String mapSignature(final String signature, final 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(final SignatureVisitor v) {
        return new RemappingSignatureAdapter(v, this);
    }

    /**
     * Map method name to the new name. Subclasses can override.
     */
    public String mapMethodName(final String owner, final String name, final String desc) {
        return name;
    }

    /**
     * Map field name to the new name. Subclasses can override.
     */
    public String mapFieldName(final String owner, final String name, final String desc) {
        return name;
    }

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

}
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