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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.

For example, if the first object instance javax.swing.JButton
is passed into instanceName then the returned
string identifier will be "JButton0".
Author:
Philip Milne/**
 * 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<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.
/**
     * 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.
/**
     * 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.
/**
     * 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.
Params:
instance – object used to generate string
Returns:
a unique string representing the object/**
     * 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, new Integer(instanceNumber));

            result = className + instanceNumber;
            valueToName.put(instance, result);
            return result;
        }
    }
}