org.cipango.callflow.CallflowNotificationFilter.java Source code

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Here is the source code for org.cipango.callflow.CallflowNotificationFilter.java

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// ========================================================================
// Copyright 2011 NEXCOM Systems
// ------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at 
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========================================================================
package org.cipango.callflow;

import javax.management.Notification;
import javax.management.NotificationFilter;

import org.apache.commons.jexl.Expression;
import org.apache.commons.jexl.ExpressionFactory;
import org.apache.commons.jexl.JexlContext;
import org.apache.commons.jexl.JexlHelper;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;

public class CallflowNotificationFilter implements NotificationFilter {
    private static final Logger LOG = Log.getLogger(CallflowNotificationFilter.class);

    private String _filter;

    public CallflowNotificationFilter(String filter) {
        _filter = filter;
    }

    @SuppressWarnings("unchecked")
    public synchronized boolean isNotificationEnabled(Notification notification) {
        if (_filter == null || "".equals(_filter))
            return true;

        if (notification instanceof CallflowNotification) {
            try {
                CallflowNotification notif = (CallflowNotification) notification;
                JexlContext jc = JexlHelper.createContext();
                Expression msgExpression = null;
                msgExpression = ExpressionFactory.createExpression("log." + _filter);

                jc.getVars().put("log", notif.getMessageInfo());
                jc.getVars().put("message", notif.getMessageInfo().getMessage());

                return ((Boolean) msgExpression.evaluate(jc));
            } catch (Exception e) {
                LOG.ignore(e);
            }
        }
        return false;
    }

    public String getFilter() {
        return _filter;
    }

    public synchronized void setFilter(String filter) {
        _filter = filter;
    }

}