/* * Copyright (c) 2000, 2005, 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</code> then the returned * string identifier will be &quot;JButton0&quot;. * * @author Philip Milne */class NameGenerator {     private Map valueToName;    private Map 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.     */    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 = (String)valueToName.get(instance);            if (result != null) {                return result;            }            Class type = instance.getClass();            String className = unqualifiedClassName(type);             Object size = nameToCount.get(className);            int instanceNumber = (size == null) ? 0 : ((Integer)size).intValue() + 1;            nameToCount.put(className, new Integer(instanceNumber));             result = className + instanceNumber;            valueToName.put(instance, result);            return result;        }    }}