/*

 * Copyright 2002-2003 Sun Microsystems, Inc.  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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package com.sun.tools.javah;

import com.sun.javadoc.*;

import java.io.*;

import java.util.*;

/**

 * Returns internal type signature.

 *

 * @author Sucheta Dambalkar

 */

public class TypeSignature{

    RootDoc root  = null;

    /* Signature Characters */

    private static final String SIG_VOID                   = "V";

    private static final String SIG_BOOLEAN                = "Z";

    private static final String SIG_BYTE                   = "B";

    private static final String SIG_CHAR                   = "C";

    private static final String SIG_SHORT                  = "S";

    private static final String SIG_INT                    = "I";

    private static final String SIG_LONG                   = "J";

    private static final String SIG_FLOAT                  = "F";

    private static final String SIG_DOUBLE                 = "D";

    private static final String SIG_ARRAY                  = "[";

    private static final String SIG_CLASS                  = "L";

    public TypeSignature(RootDoc root){

        this.root = root;

    }

    /*

     * Returns the type signature of a field according to JVM specs

     */

    public String getTypeSignature(String javasignature){

        return getParamJVMSignature(javasignature);

    }

    /*

     * Returns the type signature of a method according to JVM specs

     */

    public String getTypeSignature(String javasignature, Type returnType){

        String signature = null; //Java type signature.

        String typeSignature = null; //Internal type signature.

        String paramsig = null; //Java parameter signature.

        String paramJVMSig = null; //Internal parameter signature.

        String returnSig = null; //Java return type signature.

        String returnJVMType = null; //Internal return type signature.

        String dimension = null; //Array dimension.

        int startIndex = -1;

        int endIndex = -1;

        StringTokenizer st = null;

        int i = 0;

        // Gets the actual java signature without parentheses.

        if(javasignature != null){

            startIndex = javasignature.indexOf("(");

            endIndex = javasignature.indexOf(")");

        }

        if(((startIndex != -1) && (endIndex != -1))

           &&(startIndex+1 < javasignature.length())

           &&(endIndex < javasignature.length())) {

            signature = javasignature.substring(startIndex+1, endIndex);

        }

        // Separates parameters.

        if(signature != null){

            if(signature.indexOf(",") != -1){

                st = new StringTokenizer(signature, ",");

                if(st != null){

                    while (st.hasMoreTokens()) {

                        params.add(st.nextToken());

                    }

                }

            }else {

                params.add(signature);

            }

        }

        /* JVM type signature. */

        typeSignature = "(";

        // Gets indivisual internal parameter signature.

        while(params.isEmpty() != true){

            paramsig =((String)params.remove(i)).trim();

            paramJVMSig  = getParamJVMSignature(paramsig);

            if(paramJVMSig != null){

                typeSignature += paramJVMSig;

            }

        }

        typeSignature += ")";

        // Get internal return type signature.

        returnJVMType = "";

        if(returnType != null){

            dimension = returnType.dimension();

        }

        if(dimension != null){

            //Gets array dimension of return type.

            while(dimension.indexOf("[]") != -1){

                returnJVMType += "[";

                int stindex = dimension.indexOf("]") + 1;

                if(stindex <= dimension.length()){

                    dimension = dimension.substring(stindex);

                }else dimension = "";

            }

        }

        if(returnType != null){

            returnSig = returnType.qualifiedTypeName();

            returnJVMType += getComponentType(returnSig);

        }else {

            System.out.println("Invalid return type.");

        }

        typeSignature += returnJVMType;

        return typeSignature;

    }

    /*

     * Returns internal signature of a parameter.

     */

    private String getParamJVMSignature(String paramsig){

        String paramJVMSig = "";

        String componentType ="";

        if(paramsig != null){

            if(paramsig.indexOf("[]") != -1) {

                // Gets array dimension.

                int endindex = paramsig.indexOf("[]");

                componentType = paramsig.substring(0, endindex);

                String dimensionString =  paramsig.substring(endindex);

                if(dimensionString != null){

                    while(dimensionString.indexOf("[]") != -1){

                        paramJVMSig += "[";

                        int beginindex = dimensionString.indexOf("]") + 1;

                        if(beginindex < dimensionString.length()){

                            dimensionString = dimensionString.substring(beginindex);

                        }else

                            dimensionString = "";

                    }

                }

            } else componentType = paramsig;

            paramJVMSig += getComponentType(componentType);

        }

        return paramJVMSig;

    }

    /*

     * Returns internal signature of a component.

     */

    private String getComponentType(String componentType){

        String JVMSig = "";

        if(componentType != null){

            if(componentType.equals("void")) JVMSig += SIG_VOID ;

            else if(componentType.equals("boolean"))  JVMSig += SIG_BOOLEAN ;

            else if(componentType.equals("byte")) JVMSig += SIG_BYTE ;

            else if(componentType.equals("char"))  JVMSig += SIG_CHAR ;

            else if(componentType.equals("short"))  JVMSig += SIG_SHORT ;

            else if(componentType.equals("int"))  JVMSig += SIG_INT ;

            else if(componentType.equals("long"))  JVMSig += SIG_LONG ;

            else if(componentType.equals("float")) JVMSig += SIG_FLOAT ;

            else if(componentType.equals("double"))  JVMSig += SIG_DOUBLE ;

            else {

                if(!componentType.equals("")){

                    ClassDoc classNameDoc = root.classNamed(componentType);

                    if(classNameDoc == null){

                        System.out.println("Invalid class type");

                    }else {

                        String classname = classNameDoc.qualifiedName();

                        String newclassname = classname.replace('.', '/');

                        JVMSig += "L";

                        JVMSig += newclassname;

                        JVMSig += ";";

                    }

                }

            }

        }

        return JVMSig;

    }

}