jjg@46: /*
jjg@46:  * Copyright 2007 Sun Microsystems, Inc.  All Rights Reserved.
jjg@46:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jjg@46:  *
jjg@46:  * This code is free software; you can redistribute it and/or modify it
jjg@46:  * under the terms of the GNU General Public License version 2 only, as
jjg@46:  * published by the Free Software Foundation.  Sun designates this
jjg@46:  * particular file as subject to the "Classpath" exception as provided
jjg@46:  * by Sun in the LICENSE file that accompanied this code.
jjg@46:  *
jjg@46:  * This code is distributed in the hope that it will be useful, but WITHOUT
jjg@46:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jjg@46:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
jjg@46:  * version 2 for more details (a copy is included in the LICENSE file that
jjg@46:  * accompanied this code).
jjg@46:  *
jjg@46:  * You should have received a copy of the GNU General Public License version
jjg@46:  * 2 along with this work; if not, write to the Free Software Foundation,
jjg@46:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jjg@46:  *
jjg@46:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
jjg@46:  * CA 95054 USA or visit www.sun.com if you need additional information or
jjg@46:  * have any questions.
jjg@46:  */
jjg@46: 
jjg@46: package com.sun.tools.classfile;
jjg@46: 
jjg@46: import java.util.ArrayList;
jjg@46: import java.util.List;
jjg@46: 
jjg@46: /**
jjg@46:  * See JVMS3 4.4.4.
jjg@46:  *
jjg@46:  *  <p><b>This is NOT part of any API supported by Sun Microsystems.  If
jjg@46:  *  you write code that depends on this, you do so at your own risk.
jjg@46:  *  This code and its internal interfaces are subject to change or
jjg@46:  *  deletion without notice.</b>
jjg@46:  */
jjg@46: public class Signature extends Descriptor {
jjg@46: 
jjg@46:     public Signature(int index) {
jjg@46:         super(index);
jjg@46:     }
jjg@46: 
jjg@46:     public Type getType(ConstantPool constant_pool) throws ConstantPoolException {
jjg@46:         if (type == null)
jjg@46:             type = parse(getValue(constant_pool));
jjg@46:         return type;
jjg@46:     }
jjg@46: 
jjg@46:     @Override
jjg@46:     public int getParameterCount(ConstantPool constant_pool) throws ConstantPoolException {
jjg@46:         Type.MethodType m = (Type.MethodType) getType(constant_pool);
jjg@46:         return m.argTypes.size();
jjg@46:     }
jjg@46: 
jjg@46:     @Override
jjg@46:     public String getParameterTypes(ConstantPool constant_pool) throws ConstantPoolException {
jjg@46:         Type.MethodType m = (Type.MethodType) getType(constant_pool);
jjg@46:         StringBuilder sb = new StringBuilder();
jjg@46:         sb.append("(");
jjg@46:         String sep = "";
jjg@46:         for (Type argType: m.argTypes) {
jjg@46:             sb.append(sep);
jjg@46:             sb.append(argType);
jjg@46:             sep = ", ";
jjg@46:         }
jjg@46:         sb.append(")");
jjg@46:         return sb.toString();
jjg@46:     }
jjg@46: 
jjg@46:     @Override
jjg@46:     public String getReturnType(ConstantPool constant_pool) throws ConstantPoolException {
jjg@46:         Type.MethodType m = (Type.MethodType) getType(constant_pool);
jjg@46:         return m.returnType.toString();
jjg@46:     }
jjg@46: 
jjg@46:     @Override
jjg@46:     public String getFieldType(ConstantPool constant_pool) throws ConstantPoolException {
jjg@46:         return getType(constant_pool).toString();
jjg@46:     }
jjg@46: 
jjg@46:     private Type parse(String sig) {
jjg@46:         this.sig = sig;
jjg@46:         sigp = 0;
jjg@46: 
jjg@46:         List<Type> typeArgTypes = null;
jjg@46:         if (sig.charAt(sigp) == '<')
jjg@46:             typeArgTypes = parseTypeArgTypes();
jjg@46: 
jjg@46:         if (sig.charAt(sigp) == '(') {
jjg@46:             List<Type> argTypes = parseTypeSignatures(')');
jjg@46:             Type returnType = parseTypeSignature();
jjg@46:             List<Type> throwsTypes = null;
jjg@46:             while (sigp < sig.length() && sig.charAt(sigp) == '^') {
jjg@46:                 sigp++;
jjg@46:                 if (throwsTypes == null)
jjg@46:                     throwsTypes = new ArrayList<Type>();
jjg@46:                 throwsTypes.add(parseTypeSignature());
jjg@46:             }
jjg@46:             return new Type.MethodType(typeArgTypes, argTypes, returnType, throwsTypes);
jjg@46:         } else {
jjg@46:             Type t = parseTypeSignature();
jjg@46:             if (typeArgTypes == null && sigp == sig.length())
jjg@46:                 return t;
jjg@46:             Type superclass = t;
jjg@46:             List<Type> superinterfaces = new ArrayList<Type>();
jjg@46:             while (sigp < sig.length())
jjg@46:                 superinterfaces.add(parseTypeSignature());
jjg@46:             return new Type.ClassSigType(typeArgTypes, superclass, superinterfaces);
jjg@46: 
jjg@46:         }
jjg@46:     }
jjg@46: 
jjg@46:     private Type parseTypeSignature() {
jjg@46:         switch (sig.charAt(sigp)) {
jjg@46:             case 'B':
jjg@46:                 sigp++;
jjg@46:                 return new Type.SimpleType("byte");
jjg@46: 
jjg@46:             case 'C':
jjg@46:                 sigp++;
jjg@46:                 return new Type.SimpleType("char");
jjg@46: 
jjg@46:             case 'D':
jjg@46:                 sigp++;
jjg@46:                 return new Type.SimpleType("double");
jjg@46: 
jjg@46:             case 'F':
jjg@46:                 sigp++;
jjg@46:                 return new Type.SimpleType("float");
jjg@46: 
jjg@46:             case 'I':
jjg@46:                 sigp++;
jjg@46:                 return new Type.SimpleType("int");
jjg@46: 
jjg@46:             case 'J':
jjg@46:                 sigp++;
jjg@46:                 return new Type.SimpleType("long");
jjg@46: 
jjg@46:             case 'L':
jjg@46:                 return parseClassTypeSignature();
jjg@46: 
jjg@46:             case 'S':
jjg@46:                 sigp++;
jjg@46:                 return new Type.SimpleType("short");
jjg@46: 
jjg@46:             case 'T':
jjg@46:                 return parseTypeVariableSignature();
jjg@46: 
jjg@46:             case 'V':
jjg@46:                 sigp++;
jjg@46:                 return new Type.SimpleType("void");
jjg@46: 
jjg@46:             case 'Z':
jjg@46:                 sigp++;
jjg@46:                 return new Type.SimpleType("boolean");
jjg@46: 
jjg@46:             case '[':
jjg@46:                 sigp++;
jjg@46:                 return new Type.ArrayType(parseTypeSignature());
jjg@46: 
jjg@46:             case '*':
jjg@46:                 sigp++;
jjg@46:                 return new Type.WildcardType();
jjg@46: 
jjg@46:             case '+':
jjg@46:                 sigp++;
jjg@46:                 return new Type.WildcardType("extends", parseTypeSignature());
jjg@46: 
jjg@46:             case '-':
jjg@46:                 sigp++;
jjg@46:                 return new Type.WildcardType("super", parseTypeSignature());
jjg@46: 
jjg@46:             default:
jjg@46:                 throw new IllegalStateException(debugInfo());
jjg@46:         }
jjg@46:     }
jjg@46: 
jjg@46:     private List<Type> parseTypeSignatures(char term) {
jjg@46:         sigp++;
jjg@46:         List<Type> types = new ArrayList<Type>();
jjg@46:         while (sig.charAt(sigp) != term)
jjg@46:             types.add(parseTypeSignature());
jjg@46:         sigp++;
jjg@46:         return types;
jjg@46:     }
jjg@46: 
jjg@46:     private Type parseClassTypeSignature() {
jjg@46:         assert sig.charAt(sigp) == 'L';
jjg@46:         sigp++;
jjg@46:         return parseClassTypeSignatureRest();
jjg@46:     }
jjg@46: 
jjg@46:     private Type parseClassTypeSignatureRest() {
jjg@46:         StringBuilder sb = new StringBuilder();
jjg@46:         Type t = null;
jjg@46:         char sigch;
jjg@46:         while (true) {
jjg@46:             switch  (sigch = sig.charAt(sigp)) {
jjg@46:                 case '/':
jjg@46:                     sigp++;
jjg@46:                     sb.append(".");
jjg@46:                     break;
jjg@46: 
jjg@46:                 case '.':
jjg@46:                     sigp++;
jjg@46:                     if (t == null)
jjg@46:                         t = new Type.SimpleType(sb.toString());
jjg@46:                     return new Type.InnerClassType(t, parseClassTypeSignatureRest());
jjg@46: 
jjg@46:                 case ';':
jjg@46:                     sigp++;
jjg@46:                     if (t == null)
jjg@46:                         t = new Type.SimpleType(sb.toString());
jjg@46:                     return t;
jjg@46: 
jjg@46:                 case '<':
jjg@46:                     List<Type> argTypes = parseTypeSignatures('>');
jjg@46:                     t = new Type.ClassType(sb.toString(), argTypes);
jjg@46:                     break;
jjg@46: 
jjg@46:                 default:
jjg@46:                     sigp++;
jjg@46:                     sb.append(sigch);
jjg@46:                     break;
jjg@46:             }
jjg@46:         }
jjg@46:     }
jjg@46: 
jjg@46:     private List<Type> parseTypeArgTypes() {
jjg@46:         assert sig.charAt(sigp) == '<';
jjg@46:         sigp++;
jjg@46:         List<Type> types = null;
jjg@46:         types = new ArrayList<Type>();
jjg@46:         while (sig.charAt(sigp) != '>')
jjg@46:             types.add(parseTypeArgType());
jjg@46:         sigp++;
jjg@46:         return types;
jjg@46:     }
jjg@46: 
jjg@46:     private Type parseTypeArgType() {
jjg@46:         int sep = sig.indexOf(":", sigp);
jjg@46:         String name = sig.substring(sigp, sep);
jjg@46:         Type classBound = null;
jjg@46:         List<Type> interfaceBounds = null;
jjg@46:         sigp = sep + 1;
jjg@46:         if (sig.charAt(sigp) != ':')
jjg@46:             classBound = parseTypeSignature();
jjg@46:         while (sig.charAt(sigp) == ':') {
jjg@46:             sigp++;
jjg@46:             if (interfaceBounds == null)
jjg@46:                 interfaceBounds = new ArrayList<Type>();
jjg@46:             interfaceBounds.add(parseTypeSignature());
jjg@46:         }
jjg@46:         return new Type.TypeArgType(name, classBound, interfaceBounds);
jjg@46:     }
jjg@46: 
jjg@46:     private Type parseTypeVariableSignature() {
jjg@46:         sigp++;
jjg@46:         int sep = sig.indexOf(';', sigp);
jjg@46:         Type t = new Type.SimpleType(sig.substring(sigp, sep));
jjg@46:         sigp = sep + 1;
jjg@46:         return t;
jjg@46:     }
jjg@46: 
jjg@46:     private String debugInfo() {
jjg@46:         return sig.substring(0, sigp) + "!" + sig.charAt(sigp) + "!" + sig.substring(sigp+1);
jjg@46:     }
jjg@46: 
jjg@46:     private String sig;
jjg@46:     private int sigp;
jjg@46: 
jjg@46:     private Type type;
jjg@46: }