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Portal门户 -
Liferay相关
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Wednesday, 02 April 2008 05:50 |
package com.liferay.portal.util;
import java.util.Hashtable;
import java.util.Random;
/**
* <a href="/ImageKey.java.html" mce_href="/ImageKey.java.html"><b><i>View Source</i></b></a>
*
* @author Brian Wing Shun Chan
* @version $Revision: 1.4 $
*
*/
public class ImageKey {
public static String generateNewKey(String id) {
ImageKey imageKey = _getInstance();
Random random = new Random();
int i = random.nextInt(1000000);
String key = Integer.toString(i);
imageKey._put(id, key);
return key;
}
public static String get(String id) {
ImageKey imageKey = _getInstance();
String key = imageKey._get(id);
if (key == null) {
key = generateNewKey(id);
}
return key;
}
private static ImageKey _getInstance() {
if (_instance == null) {
synchronized (ImageKey.class) {
if (_instance == null) {
_instance = new ImageKey();
}
}
}
return _instance;
}
private ImageKey() {
_imageKey = new Hashtable();
}
private String _get(String id) {
return (String)_imageKey.get(id);
}
private void _put(String id, String key) {
_imageKey.put(id, key);
}
private static ImageKey _instance;
private Hashtable _imageKey;
}
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