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1: /* Signature.java -- utility class to compute class and method signatures 2: Copyright (C) 2005 Free Software Foundation 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: terms of your choice, provided that you also meet, for each linked 32: independent module, the terms and conditions of the license of that 33: module. An independent module is a module which is not derived from 34: or based on this library. If you modify this library, you may extend 35: this exception to your version of the library, but you are not 36: obligated to do so. If you do not wish to do so, delete this 37: exception statement from your version. */ 38: 39: 40: package gnu.classpath.jdwp.util; 41: 42: import java.lang.reflect.Field; 43: import java.lang.reflect.Method; 44: 45: /** 46: * A class to compute class and method signatures. 47: * 48: * @author Tom Tromey (tromey@redhat.com) 49: * @author Keith Seitz (keiths@redhat.com) 50: */ 51: public class Signature 52: { 53: /** 54: * Computes the class signature, i.e., java.lang.String.class 55: * returns "Ljava/lang/String;". 56: * 57: * @param theClass the class for which to compute the signature 58: * @return the class's type signature 59: */ 60: public static String computeClassSignature (Class theClass) 61: { 62: StringBuffer sb = new StringBuffer (); 63: _addToSignature (sb, theClass); 64: return sb.toString (); 65: } 66: 67: /** 68: * Computes the field signature which is just the class signature of the 69: * field's type, ie a Field of type java.lang.String this will return 70: * "Ljava/lang/String;". 71: * 72: * @param field the field for which to compute the signature 73: * @return the field's type signature 74: */ 75: public static String computeFieldSignature (Field field) 76: { 77: return computeClassSignature (field.getType()); 78: } 79: 80: /** 81: * Computes the method signature, i.e., java.lang.String.split (String, int) 82: * returns "(Ljava/lang/String;I)[Ljava/lang/String;" 83: * 84: * @param method the method for which to compute the signature 85: * @return the method's type signature 86: */ 87: public static String computeMethodSignature (Method method) 88: { 89: return _computeSignature (method.getReturnType (), 90: method.getParameterTypes ()); 91: } 92: 93: private static String _computeSignature (Class returnType, 94: Class[] paramTypes) 95: { 96: StringBuffer sb = new StringBuffer ("("); 97: if (paramTypes != null) 98: { 99: for (int i = 0; i < paramTypes.length; ++i) 100: _addToSignature (sb, paramTypes[i]); 101: } 102: sb.append (")"); 103: _addToSignature (sb, returnType); 104: return sb.toString(); 105: } 106: 107: private static void _addToSignature (StringBuffer sb, Class k) 108: { 109: // For some reason there's no easy way to get the signature of a 110: // class. 111: if (k.isPrimitive ()) 112: { 113: if (k == void.class) 114: sb.append('V'); 115: else if (k == boolean.class) 116: sb.append('Z'); 117: else if (k == byte.class) 118: sb.append('B'); 119: else if (k == char.class) 120: sb.append('C'); 121: else if (k == short.class) 122: sb.append('S'); 123: else if (k == int.class) 124: sb.append('I'); 125: else if (k == float.class) 126: sb.append('F'); 127: else if (k == double.class) 128: sb.append('D'); 129: else if (k == long.class) 130: sb.append('J'); 131: return; 132: } 133: 134: String name = k.getName (); 135: int len = name.length (); 136: sb.ensureCapacity (len); 137: if (! k.isArray ()) 138: sb.append('L'); 139: for (int i = 0; i < len; ++i) 140: { 141: char c = name.charAt (i); 142: if (c == '.') 143: c = '/'; 144: sb.append (c); 145: } 146: if (! k.isArray ()) 147: sb.append(';'); 148: } 149: }