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com.jidesoft.comparator.ObjectComparatorManager Maven / Gradle / Ivy
/*
* @(#) ObjectComparatorManager.java
*
* Copyright 2002 - 2003 JIDE Software. All rights reserved.
*/
package com.jidesoft.comparator;
import com.jidesoft.converter.CacheMap;
import com.jidesoft.converter.RegistrationListener;
import java.text.Collator;
import java.util.Calendar;
import java.util.Comparator;
/**
* A global object that can register comparator with a type and a ComparatorContext.
*/
public class ObjectComparatorManager {
private final static CacheMap, ComparatorContext> _cache = new CacheMap, ComparatorContext>(new ComparatorContext(""));
private final static Comparator _defaultComparator = new DefaultComparator();
public static void registerComparator(Class clazz, Comparator comparator) {
registerComparator(clazz, comparator, ComparatorContext.DEFAULT_CONTEXT);
}
/**
* Registers a comparator with the type specified as class and a comparator context specified as context.
*
* @param clazz type.
* @param comparator the comparator to be registered.
* @param context the comparator context.
*/
public static void registerComparator(Class clazz, Comparator comparator, ComparatorContext context) {
if (clazz == null) {
throw new IllegalArgumentException("Parameter clazz cannot be null");
}
if (context == null) {
context = ComparatorContext.DEFAULT_CONTEXT;
}
if (isAutoInit() && !_initing) {
initDefaultComparator();
}
_cache.register(clazz, comparator, context);
}
/**
* Unregisters comparator associated with clazz and context.
*
* @param clazz the data type.
*/
public static void unregisterComparator(Class clazz) {
_cache.unregister(clazz, ComparatorContext.DEFAULT_CONTEXT);
}
/**
* Unregisters comparator associated with clazz and context.
*
* @param clazz the data type.
* @param context the comparator context.
*/
public static void unregisterComparator(Class clazz, ComparatorContext context) {
if (context == null) {
context = ComparatorContext.DEFAULT_CONTEXT;
}
_cache.unregister(clazz, context);
}
/**
* Unregisters all the comparators which registered before.
*/
public static void unregisterAllComparators() {
_cache.clear();
}
/**
* Gets the registered comparator associated with class and default context.
*
* @param clazz the data type.
* @return the registered comparator.
*/
public static Comparator getComparator(Class clazz) {
return getComparator(clazz, ComparatorContext.DEFAULT_CONTEXT);
}
/**
* Gets the comparator.
*
* @param clazz the data type.
* @param context the comparator context.
* @return the comparator.
*/
public static Comparator getComparator(Class clazz, ComparatorContext context) {
if (isAutoInit()) {
initDefaultComparator();
}
if (context == null) {
context = ComparatorContext.DEFAULT_CONTEXT;
}
Comparator object = _cache.getRegisteredObject(clazz, context);
if (object != null) {
return object;
}
else {
return _defaultComparator;
}
}
/**
* Compares the two objects. It will look up in ObjectComparatorManager to find the comparator and
* compare.
*
* @param o1 the first object to be compared.
* @param o2 the second object to be compared.
* @return the compare result as defined in {@link Comparator#compare(Object,Object)}
*/
public static int compare(Object o1, Object o2) {
return compare(o1, o2, ComparatorContext.DEFAULT_CONTEXT);
}
/**
* Compares the two objects. It will look up in ObjectComparatorManager to find the comparator and
* compare.
*
* @param o1 the first object to be compared.
* @param o2 the second object to be compared.
* @param context the comparator context
* @return the compare result as defined in {@link Comparator#compare(Object,Object)}
*/
public static int compare(Object o1, Object o2, ComparatorContext context) {
if (o1 == null && o2 == null) {
return 0;
}
else if (o1 == null) {
return -1;
}
else if (o2 == null) {
return 1;
}
// both not null
Class clazz;
Class clazz1 = o1.getClass();
Class clazz2 = o2.getClass();
if (clazz1 == clazz2) {
clazz = clazz1;
}
else if (clazz1.isAssignableFrom(clazz2)) {
clazz = clazz1;
}
else if (clazz2.isAssignableFrom(clazz1)) {
clazz = clazz2;
}
else if (clazz1.isAssignableFrom(Comparable.class) && clazz2.isAssignableFrom(Comparable.class)) {
clazz = Comparable.class;
}
else {
clazz = Object.class;
}
return compare(o1, o2, clazz, context);
}
/**
* Compares the two objects. It will look up in ObjectComparatorManager to find the comparator and
* compare. This method needs a third parameter which is the data type. This is useful when you have two objects
* that have different data types but both extend the same super class. In this case, you may want the super class
* as the key to look up in ObjectComparatorManager.
*
* @param o1 the first object to be compared.
* @param o2 the second object to be compared.
* @param clazz the data type of the two objects. If your two objects have the same type, you may just use {@link
* #compare(Object,Object)} methods.
* @return the compare result as defined in {@link Comparator#compare(Object,Object)}
*/
public static int compare(Object o1, Object o2, Class clazz) {
return compare(o1, o2, clazz, ComparatorContext.DEFAULT_CONTEXT);
}
/**
* Compares the two objects. It will look up in ObjectComparatorManager to find the comparator and
* compare. If it is not found, we will convert the object to string and compare the two strings.
*
* @param o1 the first object to be compared.
* @param o2 the second object to be compared.
* @param clazz the data type of the two objects. If your two objects have the same type, you may just use {@link
* #compare(Object,Object)} methods.
* @param context the comparator context
* @return the compare result as defined in {@link Comparator#compare(Object,Object)}
*/
public static int compare(Object o1, Object o2, Class clazz, ComparatorContext context) {
Comparator comparator = getComparator(clazz, context);
if (comparator != null) {
try {
return comparator.compare(o1, o2);
}
catch (Exception e) {
// ignore and let the code below handles it.
}
}
if (o1 == o2) {
return 0;
}
else {
if (o1 == null) {
return -1;
}
else if (o2 == null) {
return 1;
}
else { // otherwise, compare as string
return o1.toString().compareTo(o2.toString());
}
}
}
private static boolean _inited = false;
private static boolean _initing = false;
private static boolean _autoInit = true;
/**
* Checks the value of autoInit.
*
* @return true or false.
* @see #setAutoInit(boolean)
*/
public static boolean isAutoInit() {
return _autoInit;
}
/**
* Sets autoInit to true or false. If autoInit is true, whenever someone tries to call methods like as toString or
* fromString, {@link #initDefaultComparator()} will be called if it has never be called. By default, autoInit is
* true.
*
* This might affect the behavior if users provide their own comparators and want to overwrite default comparators.
* In this case, instead of depending on autoInit to initialize default comparators, you should call {@link
* #initDefaultComparator()} first, then call registerComparator to add your own comparators.
*
* @param autoInit false if you want to disable autoInit which means you either don't want those default comparators
* registered or you will call {@link #initDefaultComparator()} yourself.
*/
public static void setAutoInit(boolean autoInit) {
_autoInit = autoInit;
}
/**
* Adds a listener to the list that's notified each time a change to the manager occurs.
*
* @param l the RegistrationListener
*/
public static void addRegistrationListener(RegistrationListener l) {
_cache.addRegistrationListener(l);
}
/**
* Removes a listener from the list that's notified each time a change to the manager occurs.
*
* @param l the RegistrationListener
*/
public static void removeRegistrationListener(RegistrationListener l) {
_cache.removeRegistrationListener(l);
}
/**
* Returns an array of all the registration listeners registered on this manager.
*
* @return all of this registration's RegistrationListeners or an empty array if no registration
* listeners are currently registered
* @see #addRegistrationListener
* @see #removeRegistrationListener
*/
public static RegistrationListener[] getRegistrationListeners() {
return _cache.getRegistrationListeners();
}
/**
* Gets the available ComparatorContexts registered with the class.
*
* @param clazz the class.
* @return the available ComparatorContext.
*/
public static ComparatorContext[] getComparatorContexts(Class clazz) {
return _cache.getKeys(clazz, new ComparatorContext[0]);
}
/**
* Initialize default comparator. Please make sure you call this method before you use any comparator related
* classes such as SortableTableModel.
*/
public static void initDefaultComparator() {
if (_inited) {
return;
}
_initing = true;
try {
registerComparator(Object.class, new DefaultComparator());
registerComparator(Boolean.class, new BooleanComparator());
registerComparator(Calendar.class, new CalendarComparator());
NumberComparator numberComparator = new NumberComparator();
registerComparator(Number.class, numberComparator);
registerComparator(double.class, numberComparator);
registerComparator(float.class, numberComparator);
registerComparator(long.class, numberComparator);
registerComparator(int.class, numberComparator);
registerComparator(short.class, numberComparator);
registerComparator(Comparable.class, new FastComparableComparator());
registerComparator(String.class, Collator.getInstance());
registerComparator(CharSequence.class, new AlphanumComparator(), AlphanumComparator.CONTEXT);
registerComparator(CharSequence.class, new AlphanumComparator(false), AlphanumComparator.CONTEXT_IGNORE_CASE);
}
finally {
_initing = false;
_inited = true;
}
}
/**
* If {@link #initDefaultComparator()} is called once, calling it again will have no effect because an internal flag
* is set. This method will reset the internal flag so that you can call {@link #initDefaultComparator()} in case
* you unresgister all comparators using {@link #unregisterAllComparators()}.
*/
public static void resetInit() {
_inited = false;
}
public static void clear() {
resetInit();
_cache.clear();
}
}
