| /* |
| * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package java.beans; |
| |
| import java.util.HashMap; |
| import java.util.IdentityHashMap; |
| import java.util.Map; |
| |
| import static java.util.Locale.ENGLISH; |
| |
| /** |
| * A utility class which generates unique names for object instances. |
| * The name will be a concatenation of the unqualified class name |
| * and an instance number. |
| * <p> |
| * For example, if the first object instance javax.swing.JButton |
| * is passed into {@code instanceName} then the returned |
| * string identifier will be "JButton0". |
| * |
| * @author Philip Milne |
| */ |
| class NameGenerator { |
| |
| private Map<Object, String> valueToName; |
| private Map<String, Integer> nameToCount; |
| |
| public NameGenerator() { |
| valueToName = new IdentityHashMap<>(); |
| nameToCount = new HashMap<>(); |
| } |
| |
| /** |
| * Clears the name cache. Should be called to near the end of |
| * the encoding cycle. |
| */ |
| public void clear() { |
| valueToName.clear(); |
| nameToCount.clear(); |
| } |
| |
| /** |
| * Returns the root name of the class. |
| */ |
| @SuppressWarnings("rawtypes") |
| public static String unqualifiedClassName(Class type) { |
| if (type.isArray()) { |
| return unqualifiedClassName(type.getComponentType())+"Array"; |
| } |
| String name = type.getName(); |
| return name.substring(name.lastIndexOf('.')+1); |
| } |
| |
| /** |
| * Returns a String which capitalizes the first letter of the string. |
| */ |
| public static String capitalize(String name) { |
| if (name == null || name.length() == 0) { |
| return name; |
| } |
| return name.substring(0, 1).toUpperCase(ENGLISH) + name.substring(1); |
| } |
| |
| /** |
| * Returns a unique string which identifies the object instance. |
| * Invocations are cached so that if an object has been previously |
| * passed into this method then the same identifier is returned. |
| * |
| * @param instance object used to generate string |
| * @return a unique string representing the object |
| */ |
| public String instanceName(Object instance) { |
| if (instance == null) { |
| return "null"; |
| } |
| if (instance instanceof Class) { |
| return unqualifiedClassName((Class)instance); |
| } |
| else { |
| String result = valueToName.get(instance); |
| if (result != null) { |
| return result; |
| } |
| Class<?> type = instance.getClass(); |
| String className = unqualifiedClassName(type); |
| |
| Integer size = nameToCount.get(className); |
| int instanceNumber = (size == null) ? 0 : (size).intValue() + 1; |
| nameToCount.put(className, instanceNumber); |
| |
| result = className + instanceNumber; |
| valueToName.put(instance, result); |
| return result; |
| } |
| } |
| } |