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jeremybenn |
/* Signature.java -- utility class to compute class and method signatures
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Copyright (C) 2005 Free Software Foundation
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.classpath.jdwp.util;
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import gnu.java.lang.CPStringBuilder;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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/**
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* A class to compute class and method signatures.
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*
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* @author Tom Tromey (tromey@redhat.com)
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* @author Keith Seitz (keiths@redhat.com)
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*/
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public class Signature
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{
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/**
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* Computes the class signature, i.e., java.lang.String.class
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* returns "Ljava/lang/String;".
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*
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* @param theClass the class for which to compute the signature
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* @return the class's type signature
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*/
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public static String computeClassSignature (Class theClass)
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{
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CPStringBuilder sb = new CPStringBuilder ();
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_addToSignature (sb, theClass);
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return sb.toString ();
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}
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/**
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* Computes the field signature which is just the class signature of the
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* field's type, ie a Field of type java.lang.String this will return
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* "Ljava/lang/String;".
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*
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* @param field the field for which to compute the signature
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* @return the field's type signature
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*/
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public static String computeFieldSignature (Field field)
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{
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return computeClassSignature (field.getType());
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}
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/**
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* Computes the method signature, i.e., java.lang.String.split (String, int)
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* returns "(Ljava/lang/String;I)[Ljava/lang/String;"
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*
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* @param method the method for which to compute the signature
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* @return the method's type signature
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*/
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public static String computeMethodSignature (Method method)
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{
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return _computeSignature (method.getReturnType (),
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method.getParameterTypes ());
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}
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private static String _computeSignature (Class returnType,
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Class[] paramTypes)
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{
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CPStringBuilder sb = new CPStringBuilder ("(");
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if (paramTypes != null)
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{
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for (int i = 0; i < paramTypes.length; ++i)
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_addToSignature (sb, paramTypes[i]);
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}
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sb.append (")");
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_addToSignature (sb, returnType);
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return sb.toString();
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}
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private static void _addToSignature (CPStringBuilder sb, Class k)
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{
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// For some reason there's no easy way to get the signature of a
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// class.
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if (k.isPrimitive ())
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{
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if (k == void.class)
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sb.append('V');
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else if (k == boolean.class)
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sb.append('Z');
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else if (k == byte.class)
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sb.append('B');
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else if (k == char.class)
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sb.append('C');
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else if (k == short.class)
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sb.append('S');
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else if (k == int.class)
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sb.append('I');
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else if (k == float.class)
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sb.append('F');
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else if (k == double.class)
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sb.append('D');
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else if (k == long.class)
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sb.append('J');
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return;
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}
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String name = k.getName ();
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int len = name.length ();
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sb.ensureCapacity (len);
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if (! k.isArray ())
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sb.append('L');
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for (int i = 0; i < len; ++i)
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{
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char c = name.charAt (i);
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if (c == '.')
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c = '/';
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sb.append (c);
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}
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if (! k.isArray ())
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sb.append(';');
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}
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}
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