/*
* Copyright (c) 2007, 2008, 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.classfile;
import java.util.ArrayList;
import java.util.List;
import com.sun.tools.classfile.Type.*;
/**
* See JVMS 4.4.4.
*
* <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>
*/
public class Signature extends Descriptor {
public Signature(int index) {
super(index);
}
public Type getType(ConstantPool constant_pool) throws ConstantPoolException {
if (type == null)
type = parse(getValue(constant_pool));
return type;
}
@Override
public int getParameterCount(ConstantPool constant_pool) throws ConstantPoolException {
MethodType m = (MethodType) getType(constant_pool);
return m.paramTypes.size();
}
@Override
public String getParameterTypes(ConstantPool constant_pool) throws ConstantPoolException {
MethodType m = (MethodType) getType(constant_pool);
StringBuilder sb = new StringBuilder();
sb.append("(");
String sep = "";
for (Type paramType: m.paramTypes) {
sb.append(sep);
sb.append(paramType);
sep = ", ";
}
sb.append(")");
return sb.toString();
}
@Override
public String getReturnType(ConstantPool constant_pool) throws ConstantPoolException {
MethodType m = (MethodType) getType(constant_pool);
return m.returnType.toString();
}
@Override
public String getFieldType(ConstantPool constant_pool) throws ConstantPoolException {
return getType(constant_pool).toString();
}
private Type parse(String sig) {
this.sig = sig;
sigp = 0;
List<TypeParamType> typeParamTypes = null;
if (sig.charAt(sigp) == '<')
typeParamTypes = parseTypeParamTypes();
if (sig.charAt(sigp) == '(') {
List<Type> paramTypes = parseTypeSignatures(')');
Type returnType = parseTypeSignature();
List<Type> throwsTypes = null;
while (sigp < sig.length() && sig.charAt(sigp) == '^') {
sigp++;
if (throwsTypes == null)
throwsTypes = new ArrayList<>();
throwsTypes.add(parseTypeSignature());
}
return new MethodType(typeParamTypes, paramTypes, returnType, throwsTypes);
} else {
Type t = parseTypeSignature();
if (typeParamTypes == null && sigp == sig.length())
return t;
Type superclass = t;
List<Type> superinterfaces = null;
while (sigp < sig.length()) {
if (superinterfaces == null)
superinterfaces = new ArrayList<>();
superinterfaces.add(parseTypeSignature());
}
return new ClassSigType(typeParamTypes, superclass, superinterfaces);
}
}
private Type parseTypeSignature() {
switch (sig.charAt(sigp)) {
case 'B':
sigp++;
return new SimpleType("byte");
case 'C':
sigp++;
return new SimpleType("char");
case 'D':
sigp++;
return new SimpleType("double");
case 'F':
sigp++;
return new SimpleType("float");
case 'I':
sigp++;
return new SimpleType("int");
case 'J':
sigp++;
return new SimpleType("long");
case 'L':
return parseClassTypeSignature();
case 'S':
sigp++;
return new SimpleType("short");
case 'T':
return parseTypeVariableSignature();
case 'V':
sigp++;
return new SimpleType("void");
case 'Z':
sigp++;
return new SimpleType("boolean");
case '[':
sigp++;
return new ArrayType(parseTypeSignature());
case '*':
sigp++;
return new WildcardType();
case '+':
sigp++;
return new WildcardType(WildcardType.Kind.EXTENDS, parseTypeSignature());
case '-':
sigp++;
return new WildcardType(WildcardType.Kind.SUPER, parseTypeSignature());
default:
throw new IllegalStateException(debugInfo());
}
}
private List<Type> parseTypeSignatures(char term) {
sigp++;
List<Type> types = new ArrayList<>();
while (sig.charAt(sigp) != term)
types.add(parseTypeSignature());
sigp++;
return types;
}
private Type parseClassTypeSignature() {
assert sig.charAt(sigp) == 'L';
sigp++;
return parseClassTypeSignatureRest();
}
private Type parseClassTypeSignatureRest() {
StringBuilder sb = new StringBuilder();
List<Type> argTypes = null;
ClassType t = null;
char sigch ;
do {
switch (sigch = sig.charAt(sigp)) {
case '<':
argTypes = parseTypeSignatures('>');
break;
case '.':
case ';':
sigp++;
t = new ClassType(t, sb.toString(), argTypes);
sb.setLength(0);
argTypes = null;
break;
default:
sigp++;
sb.append(sigch);
break;
}
} while (sigch != ';');
return t;
}
private List<TypeParamType> parseTypeParamTypes() {
assert sig.charAt(sigp) == '<';
sigp++;
List<TypeParamType> types = new ArrayList<>();
while (sig.charAt(sigp) != '>')
types.add(parseTypeParamType());
sigp++;
return types;
}
private TypeParamType parseTypeParamType() {
int sep = sig.indexOf(":", sigp);
String name = sig.substring(sigp, sep);
Type classBound = null;
List<Type> interfaceBounds = null;
sigp = sep + 1;
if (sig.charAt(sigp) != ':')
classBound = parseTypeSignature();
while (sig.charAt(sigp) == ':') {
sigp++;
if (interfaceBounds == null)
interfaceBounds = new ArrayList<>();
interfaceBounds.add(parseTypeSignature());
}
return new TypeParamType(name, classBound, interfaceBounds);
}
private Type parseTypeVariableSignature() {
sigp++;
int sep = sig.indexOf(';', sigp);
Type t = new SimpleType(sig.substring(sigp, sep));
sigp = sep + 1;
return t;
}
private String debugInfo() {
return sig.substring(0, sigp) + "!" + sig.charAt(sigp) + "!" + sig.substring(sigp+1);
}
private String sig;
private int sigp;
private Type type;
}