/*
 * %W% %E%
 *
 * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */


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.
    Vector params = new Vector(); //List of parameters.
    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;
    }
}