jjg@46: /*
xdono@229:  * Copyright 2007-2009 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: 
jjg@46: package com.sun.tools.classfile;
jjg@46: 
jjg@46: import java.io.IOException;
jjg@46: 
jjg@46: /**
jjg@46:  * See JVMS3, section 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 Descriptor {
jjg@46:     public class InvalidDescriptor extends DescriptorException {
jjg@198:         private static final long serialVersionUID = 1L;
jjg@46:         InvalidDescriptor(String desc) {
jjg@46:             this.desc = desc;
jjg@46:             this.index = -1;
jjg@46:         }
jjg@46: 
jjg@46:         InvalidDescriptor(String desc, int index) {
jjg@46:             this.desc = desc;
jjg@46:             this.index = index;
jjg@46:         }
jjg@46: 
jjg@46:         @Override
jjg@46:         public String getMessage() {
jjg@46:             // i18n
jjg@46:             if (index == -1)
jjg@46:                 return "invalid descriptor \"" + desc + "\"";
jjg@46:             else
jjg@46:                 return "descriptor is invalid at offset " + index + " in \"" + desc + "\"";
jjg@46:         }
jjg@46: 
jjg@46:         public final String desc;
jjg@46:         public final int index;
jjg@46: 
jjg@46:     }
jjg@46: 
jjg@46:     public Descriptor(ClassReader cr) throws IOException {
jjg@46:         this(cr.readUnsignedShort());
jjg@46:     }
jjg@46: 
jjg@46:     public Descriptor(int index) {
jjg@46:         this.index = index;
jjg@46: 
jjg@46:     }
jjg@46: 
jjg@46:     public String getValue(ConstantPool constant_pool) throws ConstantPoolException {
jjg@46:         return constant_pool.getUTF8Value(index);
jjg@46:     }
jjg@46: 
jjg@46:     public int getParameterCount(ConstantPool constant_pool)
jjg@46:             throws ConstantPoolException, InvalidDescriptor {
jjg@46:         String desc = getValue(constant_pool);
jjg@46:         int end = desc.indexOf(")");
jjg@46:         if (end == -1)
jjg@46:             throw new InvalidDescriptor(desc);
jjg@46:         parse(desc, 0, end + 1);
jjg@46:         return count;
jjg@46: 
jjg@46:     }
jjg@46: 
jjg@46:     public String getParameterTypes(ConstantPool constant_pool)
jjg@46:             throws ConstantPoolException, InvalidDescriptor {
jjg@46:         String desc = getValue(constant_pool);
jjg@46:         int end = desc.indexOf(")");
jjg@46:         if (end == -1)
jjg@46:             throw new InvalidDescriptor(desc);
jjg@46:         return parse(desc, 0, end + 1);
jjg@46:     }
jjg@46: 
jjg@46:     public String getReturnType(ConstantPool constant_pool)
jjg@46:             throws ConstantPoolException, InvalidDescriptor {
jjg@46:         String desc = getValue(constant_pool);
jjg@46:         int end = desc.indexOf(")");
jjg@46:         if (end == -1)
jjg@46:             throw new InvalidDescriptor(desc);
jjg@46:         return parse(desc, end + 1, desc.length());
jjg@46:     }
jjg@46: 
jjg@46:     public String getFieldType(ConstantPool constant_pool)
jjg@46:             throws ConstantPoolException, InvalidDescriptor {
jjg@46:         String desc = getValue(constant_pool);
jjg@46:         return parse(desc, 0, desc.length());
jjg@46:     }
jjg@46: 
jjg@46:     private String parse(String desc, int start, int end)
jjg@46:             throws InvalidDescriptor {
jjg@46:         int p = start;
jjg@46:         StringBuffer sb = new StringBuffer();
jjg@46:         int dims = 0;
jjg@46:         count = 0;
jjg@46: 
jjg@46:         while (p < end) {
jjg@46:             String type;
jjg@46:             char ch;
jjg@46:             switch (ch = desc.charAt(p++)) {
jjg@46:                 case '(':
jjg@46:                     sb.append('(');
jjg@46:                     continue;
jjg@46: 
jjg@46:                 case ')':
jjg@46:                     sb.append(')');
jjg@46:                     continue;
jjg@46: 
jjg@46:                 case '[':
jjg@46:                     dims++;
jjg@46:                     continue;
jjg@46: 
jjg@46:                 case 'B':
jjg@46:                     type = "byte";
jjg@46:                     break;
jjg@46: 
jjg@46:                 case 'C':
jjg@46:                     type = "char";
jjg@46:                     break;
jjg@46: 
jjg@46:                 case 'D':
jjg@46:                     type = "double";
jjg@46:                     break;
jjg@46: 
jjg@46:                 case 'F':
jjg@46:                     type = "float";
jjg@46:                     break;
jjg@46: 
jjg@46:                 case 'I':
jjg@46:                     type = "int";
jjg@46:                     break;
jjg@46: 
jjg@46:                 case 'J':
jjg@46:                     type = "long";
jjg@46:                     break;
jjg@46: 
jjg@46:                 case 'L':
jjg@46:                     int sep = desc.indexOf(';', p);
jjg@46:                     if (sep == -1)
jjg@46:                         throw new InvalidDescriptor(desc, p - 1);
jjg@46:                     type = desc.substring(p, sep).replace('/', '.');
jjg@46:                     p = sep + 1;
jjg@46:                     break;
jjg@46: 
jjg@46:                 case 'S':
jjg@46:                     type = "short";
jjg@46:                     break;
jjg@46: 
jjg@46:                 case 'Z':
jjg@46:                     type = "boolean";
jjg@46:                     break;
jjg@46: 
jjg@46:                 case 'V':
jjg@46:                     type = "void";
jjg@46:                     break;
jjg@46: 
jjg@46:                 default:
jjg@46:                     throw new InvalidDescriptor(desc, p - 1);
jjg@46:             }
jjg@46: 
jjg@46:             if (sb.length() > 1 && sb.charAt(0) == '(')
jjg@46:                 sb.append(", ");
jjg@46:             sb.append(type);
jjg@46:             for ( ; dims > 0; dims-- )
jjg@46:                 sb.append("[]");
jjg@46: 
jjg@46:             count++;
jjg@46:         }
jjg@46: 
jjg@46:         return sb.toString();
jjg@46:     }
jjg@46: 
jjg@46:     public final int index;
jjg@46:     private int count;
jjg@46: }