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1: /* ClassHelper.java -- Utility methods to augment java.lang.Class 2: Copyright (C) 1998, 2002 Free Software Foundation, Inc. 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: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: 39: package gnu.java.lang; 40: 41: import java.lang.reflect.Field; 42: import java.lang.reflect.Method; 43: import java.util.Arrays; 44: import java.util.HashMap; 45: import java.util.HashSet; 46: import java.util.Iterator; 47: import java.util.Map; 48: import java.util.Set; 49: 50: /** 51: * ClassHelper has various methods that ought to have been in Class. 52: * 53: * @author John Keiser 54: * @author Eric Blake (ebb9@email.byu.edu) 55: */ 56: public class ClassHelper 57: { 58: /** 59: * Strip the package part from the class name. 60: * 61: * @param clazz the class to get the truncated name from 62: * @return the truncated class name 63: */ 64: public static String getTruncatedClassName(Class clazz) 65: { 66: return getTruncatedName(clazz.getName()); 67: } 68: 69: /** 70: * Strip the package part from the class name, or the class part from 71: * the method or field name. 72: * 73: * @param name the name to truncate 74: * @return the truncated name 75: */ 76: public static String getTruncatedName(String name) 77: { 78: int lastInd = name.lastIndexOf('.'); 79: if (lastInd == -1) 80: return name; 81: return name.substring(lastInd + 1); 82: } 83: 84: /** Cache of methods found in getAllMethods(). */ 85: private static Map allMethods = new HashMap(); 86: 87: /** 88: * Get all the methods, public, private and otherwise, from the class, 89: * getting them from the most recent class to find them. This may not 90: * be quite the correct approach, as this includes methods that are not 91: * inherited or accessible from clazz, so beware. 92: * 93: * @param clazz the class to start at 94: * @return all methods declared or inherited in clazz 95: */ 96: public static Method[] getAllMethods(Class clazz) 97: { 98: Method[] retval = (Method[]) allMethods.get(clazz); 99: if (retval == null) 100: { 101: Set methods = new HashSet(); 102: Class c = clazz; 103: while (c != null) 104: { 105: Method[] currentMethods = c.getDeclaredMethods(); 106: loop: 107: for (int i = 0; i < currentMethods.length; i++) 108: { 109: Method current = currentMethods[i]; 110: int size = methods.size(); 111: Iterator iter = methods.iterator(); 112: while (--size >= 0) 113: { 114: Method override = (Method) iter.next(); 115: if (current.getName().equals(override.getName()) 116: && Arrays.equals(current.getParameterTypes(), 117: override.getParameterTypes()) 118: && current.getReturnType() == override.getReturnType()) 119: continue loop; 120: } 121: methods.add(current); 122: } 123: c = c.getSuperclass(); 124: } 125: retval = new Method[methods.size()]; 126: methods.toArray(retval); 127: allMethods.put(clazz, retval); 128: } 129: return retval; 130: } 131: 132: /** Cache of fields found in getAllFields(). */ 133: private static Map allFields = new HashMap(); 134: 135: /** 136: * Get all the fields, public, private and otherwise, from the class, 137: * getting them from the most recent class to find them. This may not 138: * be quite the correct approach, as this includes fields that are not 139: * inherited or accessible from clazz, so beware. 140: * 141: * @param clazz the class to start at 142: * @return all fields declared or inherited in clazz 143: */ 144: public static Field[] getAllFields(Class clazz) 145: { 146: Field[] retval = (Field[]) allFields.get(clazz); 147: if (retval == null) 148: { 149: Set fields = new HashSet(); 150: Class c = clazz; 151: while (c != null) 152: { 153: Field[] currentFields = c.getDeclaredFields(); 154: loop: 155: for (int i = 0; i < currentFields.length; i++) 156: { 157: Field current = currentFields[i]; 158: int size = fields.size(); 159: Iterator iter = fields.iterator(); 160: while (--size >= 0) 161: { 162: Field override = (Field) iter.next(); 163: if (current.getName().equals(override.getName()) 164: && current.getType() == override.getType()) 165: continue loop; 166: } 167: fields.add(current); 168: } 169: c = c.getSuperclass(); 170: } 171: retval = new Field[fields.size()]; 172: fields.toArray(retval); 173: allFields.put(clazz, retval); 174: } 175: return retval; 176: } 177: }