zkoss/zk

/** ZKProxyTargetHandlers.java.

    Purpose:

    Description:

    History:
 Tue Apr 19 16:12:31 CST 2016, Created by jameschu

Copyright (C) 2015 Potix Corporation. All Rights Reserved.
*/
package org.zkoss.bind.proxy;

import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.zkoss.bind.init.ZKBinderPhaseListeners;
import org.zkoss.zk.ui.util.AggregationListener;

/**
 * An aggregating proxy target handlers
 * @author jameschu
 * @since 8.0.2
 * @see ProxyTargetHandler
 */
public class ZKProxyTargetHandlers implements AggregationListener {
    private static final Logger _log = LoggerFactory.getLogger(ZKBinderPhaseListeners.class);
    private static Map<String, ProxyTargetHandler> _handlers = new LinkedHashMap<String, ProxyTargetHandler>();

    public boolean isHandled(Class<?> klass) {
        if (ProxyTargetHandler.class.isAssignableFrom(klass)) {
            try {
                synchronized (_handlers) {
                    if (!_handlers.containsKey(klass.getName())) {
                        _handlers.put(klass.getName(), (ProxyTargetHandler) klass.newInstance());
                    }
                }
            } catch (Exception e) {
                _log.error("Error when initial proxy target handler:" + klass, e);
            }
            return true;
        }
        return false;
    }

    /**
     * Returns all of the system proxy target handlers
     */
    public static List<ProxyTargetHandler> getSystemProxyTargetHandlers() {
        Collection<ProxyTargetHandler> values;
        synchronized (_handlers) {
            values = _handlers.values();
        }
        return new LinkedList<ProxyTargetHandler>(values);
    }
}