/*

 * Copyright (c) 2002, 2003, 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 org.apidesign.javap;

import java.util.*;

import java.io.*;

/**

 * Returns java type signature.

 *

 * @author  Sucheta Dambalkar

 */

public class TypeSignature {

    String parameters = null;

    String returntype = null;

    String fieldtype = null;

    int argumentlength = 0;

    public TypeSignature(String JVMSignature){

        if(JVMSignature != null){

            if(JVMSignature.indexOf("(") == -1){

                //This is a field type.

                this.fieldtype = getFieldTypeSignature(JVMSignature);

            }else {

                String parameterdes = null;

                if((JVMSignature.indexOf(")")-1) > (JVMSignature.indexOf("("))){

                    //Get parameter signature.

                    parameterdes =

                        JVMSignature.substring(JVMSignature.indexOf("(")+1,

                                               JVMSignature.indexOf(")"));

                    this.parameters = getParametersHelper(parameterdes);

                }else this.parameters = "()";

                //Get return type signature.

                String returndes = JVMSignature.substring(JVMSignature.lastIndexOf(")")+1);

                this.returntype = getReturnTypeHelper(returndes);

            }

        }

    }

    /**

     * Returns java type signature of a field.

     */

    public String getFieldTypeSignature(String fielddes){

        if(fielddes.startsWith("L")){

            return(getObjectType(fielddes));

        }else if(fielddes.startsWith("[")){

            return(getArrayType(fielddes));

        }else

            return(getBaseType(fielddes));

    }

    /**

     * Returns java type signature of a parameter.

     */

    public String getParametersHelper(String parameterdes){

        Vector parameters = new Vector();

        int startindex = -1;

        int endindex = -1;

        String param = "";

        while(parameterdes != null){

            if(parameterdes.startsWith("L")){

                //parameter is a object.

                startindex = parameterdes.indexOf("L");

                endindex = parameterdes.indexOf(";");

                if(startindex < parameterdes.length()) {

                    if(endindex == parameterdes.length()-1) {

                        //last parameter

                        param = parameterdes.substring(startindex);

                        parameterdes = null;

                    }else if(endindex+1 < parameterdes.length()){

                        //rest parameters

                        param = parameterdes.substring(startindex, endindex+1);

                        parameterdes = parameterdes.substring(endindex+1);

                    }

                    parameters.add(getObjectType(param));

                }

            }else if(parameterdes.startsWith("[")){

                //parameter is an array.

                String componentType = "";

                int enddim = -1;

                int st = 0;

                while(true){

                    if(st < parameterdes.length()){

                        if(parameterdes.charAt(st) == '['){

                            enddim = st;

                            st++;

                        }

                        else break;

                    }

                    else break;

                }

                if(enddim+1 < parameterdes.length()){

                    /* Array dimension.*/

                    param = parameterdes.substring(0,enddim+1);

                }

                int stotherparam = param.lastIndexOf("[")+1;

                if(stotherparam < parameterdes.length()){

                    componentType =  parameterdes.substring(stotherparam);

                }

                if(componentType.startsWith("L")){

                    //parameter is array of objects.

                    startindex = parameterdes.indexOf("L");

                    endindex = parameterdes.indexOf(";");

                    if(endindex ==  parameterdes.length()-1){

                        //last parameter

                        param += parameterdes.substring(startindex);

                        parameterdes = null;

                    }else if(endindex+1 <  parameterdes.length()){

                        //rest parameters

                        param += parameterdes.substring(startindex, endindex+1);

                        parameterdes = parameterdes.substring(endindex+1);

                    }

                }else{

                    //parameter is array of base type.

                    if(componentType.length() == 1){

                        //last parameter.

                        param += componentType;

                        parameterdes = null;

                    }

                    else if (componentType.length() > 1) {

                        //rest parameters.

                        param += componentType.substring(0,1);

                        parameterdes = componentType.substring(1);

                    }

                }

                parameters.add(getArrayType(param));

            }else {

                //parameter is of base type.

                if(parameterdes.length() == 1){

                    //last parameter

                    param = parameterdes;

                    parameterdes = null;

                }

                else if (parameterdes.length() > 1) {

                    //rest parameters.

                    param = parameterdes.substring(0,1);

                    parameterdes = parameterdes.substring(1);

                }

                parameters.add(getBaseType(param));

            }

        }

        /* number of arguments of a method.*/

        argumentlength =  parameters.size();

        /* java type signature.*/

        String parametersignature = "(";

        int i;

        for(i = 0; i < parameters.size(); i++){

            parametersignature += (String)parameters.elementAt(i);

            if(i != parameters.size()-1){

                parametersignature += ", ";

            }

        }

        parametersignature += ")";

        return parametersignature;

    }

    /**

     * Returns java type signature for a return type.

     */

    public String getReturnTypeHelper(String returndes){

        return getFieldTypeSignature(returndes);

    }

    /**

     * Returns java type signature for a base type.

     */

    public String getBaseType(String baseType){

        if(baseType != null){

            if(baseType.equals("B")) return "byte";

            else if(baseType.equals("C")) return "char";

            else if(baseType.equals("D")) return "double";

            else if(baseType.equals("F")) return "float";

            else if(baseType.equals("I")) return "int";

            else if(baseType.equals("J")) return "long";

            else if(baseType.equals("S")) return "short";

            else if(baseType.equals("Z")) return "boolean";

            else if(baseType.equals("V")) return "void";

        }

        return null;

    }

    /**

     * Returns java type signature for a object type.

     */

    public String getObjectType(String JVMobjectType) {

        String objectType = "";

        int startindex = JVMobjectType.indexOf("L")+1;

        int endindex =  JVMobjectType.indexOf(";");

        if((startindex != -1) && (endindex != -1)){

            if((startindex < JVMobjectType.length()) && (endindex < JVMobjectType.length())){

                objectType = JVMobjectType.substring(startindex, endindex);

            }

            objectType = objectType.replace('/','.');

            return objectType;

        }

        return null;

    }

    /**

     * Returns java type signature for array type.

     */

    public String getArrayType(String arrayType) {

        if(arrayType != null){

            String dimention = "";

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

                dimention += "[]";

                int startindex = arrayType.indexOf("[")+1;

                if(startindex <= arrayType.length()){

                arrayType = arrayType.substring(startindex);

                }

            }

            String componentType = "";

            if(arrayType.startsWith("L")){

                componentType = getObjectType(arrayType);

            }else {

                componentType = getBaseType(arrayType);

            }

            return componentType+dimention;

        }

        return null;

    }

    /**

     * Returns java type signature for parameters.

     */

     public String getParameters(){

        return parameters;

    }

    /**

     * Returns java type signature for return type.

     */

    public String getReturnType(){

        return returntype;

    }

    /**

     * Returns java type signature for field type.

     */

    public String getFieldType(){

        return fieldtype;

    }

    /**

     * Return number of arguments of a method.

     */

    public int getArgumentlength(){

        return argumentlength;

    }

}