src.jdk.jdeps.share.classes.com.sun.tools.classfile.Descriptor Maven / Gradle / Ivy
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/*
* Copyright (c) 2007, 2013, 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.io.IOException;
/**
* See JVMS, section 4.4.
*
* 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.
*/
public class Descriptor {
public static class InvalidDescriptor extends DescriptorException {
private static final long serialVersionUID = 1L;
InvalidDescriptor(String desc) {
this.desc = desc;
this.index = -1;
}
InvalidDescriptor(String desc, int index) {
this.desc = desc;
this.index = index;
}
@Override
public String getMessage() {
// i18n
if (index == -1)
return "invalid descriptor \"" + desc + "\"";
else
return "descriptor is invalid at offset " + index + " in \"" + desc + "\"";
}
public final String desc;
public final int index;
}
public Descriptor(ClassReader cr) throws IOException {
this(cr.readUnsignedShort());
}
public Descriptor(int index) {
this.index = index;
}
public String getValue(ConstantPool constant_pool) throws ConstantPoolException {
return constant_pool.getUTF8Value(index);
}
public int getParameterCount(ConstantPool constant_pool)
throws ConstantPoolException, InvalidDescriptor {
String desc = getValue(constant_pool);
int end = desc.indexOf(")");
if (end == -1)
throw new InvalidDescriptor(desc);
parse(desc, 0, end + 1);
return count;
}
public String getParameterTypes(ConstantPool constant_pool)
throws ConstantPoolException, InvalidDescriptor {
String desc = getValue(constant_pool);
int end = desc.indexOf(")");
if (end == -1)
throw new InvalidDescriptor(desc);
return parse(desc, 0, end + 1);
}
public String getReturnType(ConstantPool constant_pool)
throws ConstantPoolException, InvalidDescriptor {
String desc = getValue(constant_pool);
int end = desc.indexOf(")");
if (end == -1)
throw new InvalidDescriptor(desc);
return parse(desc, end + 1, desc.length());
}
public String getFieldType(ConstantPool constant_pool)
throws ConstantPoolException, InvalidDescriptor {
String desc = getValue(constant_pool);
return parse(desc, 0, desc.length());
}
private String parse(String desc, int start, int end)
throws InvalidDescriptor {
int p = start;
StringBuilder sb = new StringBuilder();
int dims = 0;
count = 0;
while (p < end) {
String type;
char ch;
switch (ch = desc.charAt(p++)) {
case '(':
sb.append('(');
continue;
case ')':
sb.append(')');
continue;
case '[':
dims++;
continue;
case 'B':
type = "byte";
break;
case 'C':
type = "char";
break;
case 'D':
type = "double";
break;
case 'F':
type = "float";
break;
case 'I':
type = "int";
break;
case 'J':
type = "long";
break;
case 'L':
int sep = desc.indexOf(';', p);
if (sep == -1)
throw new InvalidDescriptor(desc, p - 1);
type = desc.substring(p, sep).replace('/', '.');
p = sep + 1;
break;
case 'S':
type = "short";
break;
case 'Z':
type = "boolean";
break;
case 'V':
type = "void";
break;
default:
throw new InvalidDescriptor(desc, p - 1);
}
if (sb.length() > 1 && sb.charAt(0) == '(')
sb.append(", ");
sb.append(type);
for ( ; dims > 0; dims-- )
sb.append("[]");
count++;
}
return sb.toString();
}
public final int index;
private int count;
}