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/*
* This file is part of the Javassist toolkit.
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* either http://www.mozilla.org/MPL/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is Javassist.
*
* The Initial Developer of the Original Code is Shigeru Chiba. Portions
* created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
* All Rights Reserved.
*
* Contributor(s):
*
* The development of this software is supported in part by the PRESTO
* program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
*/
package javassist.runtime;
/**
* A support class for implementing <code>$sig</code> and
* <code>$type</code>.
* This support class is required at runtime
* only if <code>$sig</code> or <code>$type</code> is used.
*/
public class Desc {
/**
* Specifies how a <code>java.lang.Class</code> object is loaded.
*
* <p>If true, it is loaded by:
* <ul><pre>Thread.currentThread().getContextClassLoader().loadClass()</pre></ul>
* <p>If false, it is loaded by <code>Class.forName()</code>.
* The default value is false.
*/
public static boolean useContextClassLoader = false;
private static Class getClassObject(String name)
throws ClassNotFoundException
{
if (useContextClassLoader)
return Thread.currentThread().getContextClassLoader()
.loadClass(name);
else
return Class.forName(name);
}
/**
* Interprets the given class name.
* It is used for implementing <code>$class</code>.
*/
public static Class getClazz(String name) {
try {
return getClassObject(name);
}
catch (ClassNotFoundException e) {
throw new RuntimeException("$class: internal error");
}
}
/**
* Interprets the given type descriptor representing a method
* signature. It is used for implementing <code>$sig</code>.
*/
public static Class[] getParams(String desc) {
if (desc.charAt(0) != '(')
throw new RuntimeException("$sig: internal error");
return getType(desc, desc.length(), 1, 0);
}
/**
* Interprets the given type descriptor.
* It is used for implementing <code>$type</code>.
*/
public static Class getType(String desc) {
Class[] result = getType(desc, desc.length(), 0, 0);
if (result == null || result.length != 1)
throw new RuntimeException("$type: internal error");
return result[0];
}
private static Class[] getType(String desc, int descLen,
int start, int num) {
Class clazz;
if (start >= descLen)
return new Class[num];
char c = desc.charAt(start);
switch (c) {
case 'Z' :
clazz = Boolean.TYPE;
break;
case 'C' :
clazz = Character.TYPE;
break;
case 'B' :
clazz = Byte.TYPE;
break;
case 'S' :
clazz = Short.TYPE;
break;
case 'I' :
clazz = Integer.TYPE;
break;
case 'J' :
clazz = Long.TYPE;
break;
case 'F' :
clazz = Float.TYPE;
break;
case 'D' :
clazz = Double.TYPE;
break;
case 'V' :
clazz = Void.TYPE;
break;
case 'L' :
case '[' :
return getClassType(desc, descLen, start, num);
default :
return new Class[num];
}
Class[] result = getType(desc, descLen, start + 1, num + 1);
result[num] = clazz;
return result;
}
private static Class[] getClassType(String desc, int descLen,
int start, int num) {
int end = start;
while (desc.charAt(end) == '[')
++end;
if (desc.charAt(end) == 'L') {
end = desc.indexOf(';', end);
if (end < 0)
throw new IndexOutOfBoundsException("bad descriptor");
}
String cname;
if (desc.charAt(start) == 'L')
cname = desc.substring(start + 1, end);
else
cname = desc.substring(start, end + 1);
Class[] result = getType(desc, descLen, end + 1, num + 1);
try {
result[num] = getClassObject(cname.replace('/', '.'));
}
catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
return result;
}
}
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