273 lines
8.3 KiB
Java
273 lines
8.3 KiB
Java
/*
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* Copyright (c) 2007, 2008, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.tools.classfile;
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import java.util.ArrayList;
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import java.util.List;
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import com.sun.tools.classfile.Type.*;
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/**
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* See JVMS 4.4.4.
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*
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* <p><b>This is NOT part of any supported API.
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* If you write code that depends on this, you do so at your own risk.
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* This code and its internal interfaces are subject to change or
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* deletion without notice.</b>
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*/
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public class Signature extends Descriptor {
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public Signature(int index) {
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super(index);
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}
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public Type getType(ConstantPool constant_pool) throws ConstantPoolException {
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if (type == null)
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type = parse(getValue(constant_pool));
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return type;
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}
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@Override
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public int getParameterCount(ConstantPool constant_pool) throws ConstantPoolException {
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MethodType m = (MethodType) getType(constant_pool);
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return m.paramTypes.size();
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}
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@Override
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public String getParameterTypes(ConstantPool constant_pool) throws ConstantPoolException {
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MethodType m = (MethodType) getType(constant_pool);
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StringBuilder sb = new StringBuilder();
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sb.append("(");
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String sep = "";
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for (Type paramType: m.paramTypes) {
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sb.append(sep);
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sb.append(paramType);
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sep = ", ";
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}
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sb.append(")");
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return sb.toString();
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}
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@Override
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public String getReturnType(ConstantPool constant_pool) throws ConstantPoolException {
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MethodType m = (MethodType) getType(constant_pool);
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return m.returnType.toString();
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}
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@Override
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public String getFieldType(ConstantPool constant_pool) throws ConstantPoolException {
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return getType(constant_pool).toString();
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}
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private Type parse(String sig) {
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this.sig = sig;
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sigp = 0;
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List<TypeParamType> typeParamTypes = null;
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if (sig.charAt(sigp) == '<')
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typeParamTypes = parseTypeParamTypes();
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if (sig.charAt(sigp) == '(') {
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List<Type> paramTypes = parseTypeSignatures(')');
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Type returnType = parseTypeSignature();
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List<Type> throwsTypes = null;
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while (sigp < sig.length() && sig.charAt(sigp) == '^') {
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sigp++;
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if (throwsTypes == null)
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throwsTypes = new ArrayList<Type>();
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throwsTypes.add(parseTypeSignature());
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}
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return new MethodType(typeParamTypes, paramTypes, returnType, throwsTypes);
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} else {
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Type t = parseTypeSignature();
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if (typeParamTypes == null && sigp == sig.length())
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return t;
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Type superclass = t;
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List<Type> superinterfaces = null;
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while (sigp < sig.length()) {
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if (superinterfaces == null)
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superinterfaces = new ArrayList<Type>();
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superinterfaces.add(parseTypeSignature());
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}
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return new ClassSigType(typeParamTypes, superclass, superinterfaces);
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}
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}
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private Type parseTypeSignature() {
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switch (sig.charAt(sigp)) {
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case 'B':
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sigp++;
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return new SimpleType("byte");
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case 'C':
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sigp++;
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return new SimpleType("char");
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case 'D':
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sigp++;
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return new SimpleType("double");
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case 'F':
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sigp++;
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return new SimpleType("float");
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case 'I':
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sigp++;
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return new SimpleType("int");
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case 'J':
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sigp++;
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return new SimpleType("long");
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case 'L':
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return parseClassTypeSignature();
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case 'S':
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sigp++;
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return new SimpleType("short");
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case 'T':
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return parseTypeVariableSignature();
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case 'V':
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sigp++;
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return new SimpleType("void");
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case 'Z':
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sigp++;
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return new SimpleType("boolean");
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case '[':
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sigp++;
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return new ArrayType(parseTypeSignature());
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case '*':
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sigp++;
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return new WildcardType();
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case '+':
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sigp++;
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return new WildcardType(WildcardType.Kind.EXTENDS, parseTypeSignature());
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case '-':
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sigp++;
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return new WildcardType(WildcardType.Kind.SUPER, parseTypeSignature());
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default:
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throw new IllegalStateException(debugInfo());
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}
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}
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private List<Type> parseTypeSignatures(char term) {
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sigp++;
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List<Type> types = new ArrayList<Type>();
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while (sig.charAt(sigp) != term)
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types.add(parseTypeSignature());
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sigp++;
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return types;
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}
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private Type parseClassTypeSignature() {
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assert sig.charAt(sigp) == 'L';
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sigp++;
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return parseClassTypeSignatureRest();
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}
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private Type parseClassTypeSignatureRest() {
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StringBuilder sb = new StringBuilder();
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List<Type> argTypes = null;
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ClassType t = null;
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char sigch ;
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do {
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switch (sigch = sig.charAt(sigp)) {
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case '<':
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argTypes = parseTypeSignatures('>');
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break;
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case '.':
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case ';':
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sigp++;
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t = new ClassType(t, sb.toString(), argTypes);
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sb.setLength(0);
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argTypes = null;
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break;
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default:
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sigp++;
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sb.append(sigch);
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break;
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}
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} while (sigch != ';');
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return t;
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}
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private List<TypeParamType> parseTypeParamTypes() {
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assert sig.charAt(sigp) == '<';
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sigp++;
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List<TypeParamType> types = new ArrayList<TypeParamType>();
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while (sig.charAt(sigp) != '>')
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types.add(parseTypeParamType());
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sigp++;
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return types;
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}
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private TypeParamType parseTypeParamType() {
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int sep = sig.indexOf(":", sigp);
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String name = sig.substring(sigp, sep);
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Type classBound = null;
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List<Type> interfaceBounds = null;
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sigp = sep + 1;
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if (sig.charAt(sigp) != ':')
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classBound = parseTypeSignature();
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while (sig.charAt(sigp) == ':') {
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sigp++;
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if (interfaceBounds == null)
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interfaceBounds = new ArrayList<Type>();
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interfaceBounds.add(parseTypeSignature());
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}
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return new TypeParamType(name, classBound, interfaceBounds);
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}
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private Type parseTypeVariableSignature() {
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sigp++;
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int sep = sig.indexOf(';', sigp);
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Type t = new SimpleType(sig.substring(sigp, sep));
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sigp = sep + 1;
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return t;
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}
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private String debugInfo() {
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return sig.substring(0, sigp) + "!" + sig.charAt(sigp) + "!" + sig.substring(sigp+1);
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}
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private String sig;
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private int sigp;
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private Type type;
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}
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