Mercurial > jdk8-mips64-public > langtools / file revision

 /*

  * Copyright (c) 2002, 2011, 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 com.sun.tools.javah;

 import java.util.*;

 import javax.lang.model.element.Name;

 import javax.lang.model.element.TypeElement;

 import javax.lang.model.type.ArrayType;

 import javax.lang.model.type.DeclaredType;

 import javax.lang.model.type.NoType;

 import javax.lang.model.type.PrimitiveType;

 import javax.lang.model.type.TypeKind;

 import javax.lang.model.type.TypeMirror;

 import javax.lang.model.type.TypeVariable;

 import javax.lang.model.type.TypeVisitor;

 import javax.lang.model.util.Elements;

 import javax.lang.model.util.SimpleTypeVisitor8;

 /**

  * Returns internal type signature.

  *

  * <p><b>This is NOT part of any supported API.

  * If you write code that depends on this, you do so at your own

  * risk.  This code and its internal interfaces are subject to change

  * or deletion without notice.</b></p>

  *

  * @author Sucheta Dambalkar

  */

 public class TypeSignature {

     static class SignatureException extends Exception {

         private static final long serialVersionUID = 1L;

         SignatureException(String reason) {

             super(reason);

         }

     }

     Elements elems;

     /* 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(Elements elems){

         this.elems = elems;

     }

     /*

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

      */

     public String getTypeSignature(String javasignature) throws SignatureException {

         return getParamJVMSignature(javasignature);

     }

     /*

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

      */

     public String getTypeSignature(String javasignature, TypeMirror returnType)

             throws SignatureException {

         String signature = null; //Java type signature.

         String typeSignature = null; //Internal type signature.

         List<String> params = new ArrayList<String>(); //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.

         int dimensions = 0; //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 = params.remove(i).trim();

             paramJVMSig  = getParamJVMSignature(paramsig);

             if (paramJVMSig != null) {

                 typeSignature += paramJVMSig;

             }

         }

         typeSignature += ")";

         // Get internal return type signature.

         returnJVMType = "";

         if (returnType != null) {

             dimensions = dimensions(returnType);

         }

         //Gets array dimension of return type.

         while (dimensions-- > 0) {

             returnJVMType += "[";

         }

         if (returnType != null) {

             returnSig = qualifiedTypeName(returnType);

             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) throws SignatureException {

         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) throws SignatureException {

         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("")){

                     TypeElement classNameDoc = elems.getTypeElement(componentType);

                     if(classNameDoc == null){

                         throw new SignatureException(componentType);

                     }else {

                         String classname = classNameDoc.getQualifiedName().toString();

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

                         JVMSig += "L";

                         JVMSig += newclassname;

                         JVMSig += ";";

                     }

                 }

             }

         }

         return JVMSig;

     }

     int dimensions(TypeMirror t) {

         if (t.getKind() != TypeKind.ARRAY)

             return 0;

         return 1 + dimensions(((ArrayType) t).getComponentType());

     }

     String qualifiedTypeName(TypeMirror type) {

         TypeVisitor<Name, Void> v = new SimpleTypeVisitor8<Name, Void>() {

             @Override

             public Name visitArray(ArrayType t, Void p) {

                 return t.getComponentType().accept(this, p);

             }

             @Override

             public Name visitDeclared(DeclaredType t, Void p) {

                 return ((TypeElement) t.asElement()).getQualifiedName();

             }

             @Override

             public Name visitPrimitive(PrimitiveType t, Void p) {

                 return elems.getName(t.toString());

             }

             @Override

             public Name visitNoType(NoType t, Void p) {

                 if (t.getKind() == TypeKind.VOID)

                     return elems.getName("void");

                 return defaultAction(t, p);

             }

             @Override

             public Name visitTypeVariable(TypeVariable t, Void p) {

                 return t.getUpperBound().accept(this, p);

             }

         };

         return v.visit(type).toString();

     }

 }