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/* *************************************************************************
IT Mill Toolkit
Development of Browser User Interfaces Made Easy
Copyright (C) 2000-2006 IT Mill Ltd
*************************************************************************
This product is distributed under commercial license that can be found
from the product package on license/license.txt. Use of this product might
require purchasing a commercial license from IT Mill Ltd. For guidelines
on usage, see license/licensing-guidelines.html
*************************************************************************
For more information, contact:
IT Mill Ltd phone: +358 2 4802 7180
Ruukinkatu 2-4 fax: +358 2 4802 7181
20540, Turku email: info@itmill.com
Finland company www: www.itmill.com
Primary source for information and releases: www.itmill.com
********************************************************************** */
package com.itmill.toolkit.terminal;
import java.util.Hashtable;
/** Simple two-way map for generating textual keys for objects and
* retrieving the objects later with the key.
*
* @author IT Mill Ltd.
* @version @VERSION@
* @since 3.0
*/
public class KeyMapper {
private int lastKey = 0;
private Hashtable objectKeyMap = new Hashtable();
private Hashtable keyObjectMap = new Hashtable();
/** Get key for an object */
public String key(Object o) {
if (o == null) return "null";
// If the object is already mapped, use existing key
String key = (String) objectKeyMap.get(o);
if (key != null) return key;
// If the object is not yet mapped, map it
key = String.valueOf(++lastKey);
objectKeyMap.put(o,key);
keyObjectMap.put(key,o);
return key;
}
/** Check if the key belongs to a new id.
* <p>Usage of new id:s are specific to components, but for example Select
* component uses newItemId:s for selection of newly added items in
* <code>allowNewItems</code>-mode
*/
public boolean isNewIdKey(String key) {
return "NEW".equals(key);
}
/** Retrieve object with the key*/
public Object get(String key) {
return keyObjectMap.get(key);
}
/** Remove object from the mapper. */
public void remove(Object o) {
String key = (String) objectKeyMap.get(o);
if (key != null) {
objectKeyMap.remove(key);
keyObjectMap.remove(o);
}
}
/** Remove all objects from the mapper. */
public void removeAll() {
objectKeyMap.clear();
keyObjectMap.clear();
}
}
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