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| 1 | +/* | |
| 2 | + * Copyright (c) 2000, 2005, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | +package java.beans; | |
| 26 | + | |
| 27 | +import java.util.HashMap; | |
| 28 | +import java.util.IdentityHashMap; | |
| 29 | +import java.util.Map; | |
| 30 | + | |
| 31 | +import static java.util.Locale.ENGLISH; | |
| 32 | + | |
| 33 | +/** | |
| 34 | + * A utility class which generates unique names for object instances. | |
| 35 | + * The name will be a concatenation of the unqualified class name | |
| 36 | + * and an instance number. | |
| 37 | + * <p> | |
| 38 | + * For example, if the first object instance javax.swing.JButton | |
| 39 | + * is passed into <code>instanceName</code> then the returned | |
| 40 | + * string identifier will be "JButton0". | |
| 41 | + * | |
| 42 | + * @author Philip Milne | |
| 43 | + */ | |
| 44 | +class NameGenerator { | |
| 45 | + | |
| 46 | + private Map valueToName; | |
| 47 | + private Map nameToCount; | |
| 48 | + | |
| 49 | + public NameGenerator() { | |
| 50 | + valueToName = new IdentityHashMap(); | |
| 51 | + nameToCount = new HashMap(); | |
| 52 | + } | |
| 53 | + | |
| 54 | + /** | |
| 55 | + * Clears the name cache. Should be called to near the end of | |
| 56 | + * the encoding cycle. | |
| 57 | + */ | |
| 58 | + public void clear() { | |
| 59 | + valueToName.clear(); | |
| 60 | + nameToCount.clear(); | |
| 61 | + } | |
| 62 | + | |
| 63 | + /** | |
| 64 | + * Returns the root name of the class. | |
| 65 | + */ | |
| 66 | + public static String unqualifiedClassName(Class type) { | |
| 67 | + if (type.isArray()) { | |
| 68 | + return unqualifiedClassName(type.getComponentType())+"Array"; | |
| 69 | + } | |
| 70 | + String name = type.getName(); | |
| 71 | + return name.substring(name.lastIndexOf('.')+1); | |
| 72 | + } | |
| 73 | + | |
| 74 | + /** | |
| 75 | + * Returns a String which capitalizes the first letter of the string. | |
| 76 | + */ | |
| 77 | + public static String capitalize(String name) { | |
| 78 | + if (name == null || name.length() == 0) { | |
| 79 | + return name; | |
| 80 | + } | |
| 81 | + return name.substring(0, 1).toUpperCase(ENGLISH) + name.substring(1); | |
| 82 | + } | |
| 83 | + | |
| 84 | + /** | |
| 85 | + * Returns a unique string which identifies the object instance. | |
| 86 | + * Invocations are cached so that if an object has been previously | |
| 87 | + * passed into this method then the same identifier is returned. | |
| 88 | + * | |
| 89 | + * @param instance object used to generate string | |
| 90 | + * @return a unique string representing the object | |
| 91 | + */ | |
| 92 | + public String instanceName(Object instance) { | |
| 93 | + if (instance == null) { | |
| 94 | + return "null"; | |
| 95 | + } | |
| 96 | + if (instance instanceof Class) { | |
| 97 | + return unqualifiedClassName((Class)instance); | |
| 98 | + } | |
| 99 | + else { | |
| 100 | + String result = (String)valueToName.get(instance); | |
| 101 | + if (result != null) { | |
| 102 | + return result; | |
| 103 | + } | |
| 104 | + Class type = instance.getClass(); | |
| 105 | + String className = unqualifiedClassName(type); | |
| 106 | + | |
| 107 | + Object size = nameToCount.get(className); | |
| 108 | + int instanceNumber = (size == null) ? 0 : ((Integer)size).intValue() + 1; | |
| 109 | + nameToCount.put(className, new Integer(instanceNumber)); | |
| 110 | + | |
| 111 | + result = className + instanceNumber; | |
| 112 | + valueToName.put(instance, result); | |
| 113 | + return result; | |
| 114 | + } | |
| 115 | + } | |
| 116 | +} | |