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  /*
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   * Copyright 2000-2005 Sun Microsystems, Inc.  All Rights Reserved.
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   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   *
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   * This code is free software; you can redistribute it and/or modify it
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   * under the terms of the GNU General Public License version 2 only, as
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   * published by the Free Software Foundation.  Sun designates this
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   * particular file as subject to the "Classpath" exception as provided
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   * by Sun in the LICENSE file that accompanied this code.
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  *
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  * This code is distributed in the hope that it will be useful, but WITHOUT
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  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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  * version 2 for more details (a copy is included in the LICENSE file that
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  * accompanied this code).
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  *
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  * You should have received a copy of the GNU General Public License version
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  * 2 along with this work; if not, write to the Free Software Foundation,
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  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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  *
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  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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  * CA 95054 USA or visit www.sun.com if you need additional information or
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  * have any questions.
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  */
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 package java.beans;
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 import java.util.Map;
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 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.

For example, if the first object instance javax.swing.JButton is passed into instanceName then the returned string identifier will be "JButton0".

Author(s):
Philip Milne
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 class NameGenerator {
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     private Map valueToName;
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     private Map nameToCount;
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     public NameGenerator() {
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          = new IdentityHashMap();
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          = new HashMap();
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     }

    
Clears the name cache. Should be called to near the end of the encoding cycle. 
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     public void clear() {
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         .clear();
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         .clear();
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     }

    
Returns the root name of the class. 
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     public static String unqualifiedClassName(Class type) {
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         if (type.isArray()) {
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             return unqualifiedClassName(type.getComponentType())+"Array";
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         }
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         String name = type.getName();
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         return name.substring(name.lastIndexOf('.')+1);
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     }

    
Returns a String which capitalizes the first letter of the string. 
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     public static String capitalize(String name) {
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         if (name == null || name.length() == 0) {
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             return name;
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         }
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         return name.substring(0, 1).toUpperCase() + name.substring(1);
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     }

    
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.

Parameters:
instance object used to generate string
Returns:
a unique string representing the object
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     public String instanceName(Object instance) {
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         if (instance == null) {
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             return "null";
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         }
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         if (instance instanceof Class) {
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             return unqualifiedClassName((Class)instance);
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         }
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         else {
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            String result = (String).get(instance);
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            if (result != null) {
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                return result;
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            }
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            Class type = instance.getClass();
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            String className = unqualifiedClassName(type);
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            Object size = .get(className);
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            int instanceNumber = (size == null) ? 0 : ((Integer)size).intValue() + 1;
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            .put(className, new Integer(instanceNumber));
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            result = className + instanceNumber;
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            .put(instance, result);
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            return result;
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        }
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    }
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