/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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.apache.synapse.mediators.filters;

import org.apache.synapse.MessageContext;
import org.apache.synapse.SynapseLog;
import org.apache.synapse.mediators.AbstractListMediator;

/**
 * The Out Mediator acts only on "outgoing" messages from synapse. This is
 * performed by looking at the result of MessageContext#isResponse()
 *
 * @see org.apache.synapse.MessageContext#isResponse()
 */
public class OutMediator extends AbstractListMediator implements org.apache.synapse.mediators.FilterMediator {

    /**
     * Executes the list of sub/child mediators, if the filter condition is satisfied
     *
     * @param synCtx the current message
     * @return true if filter condition fails. else returns as per List mediator semantics
     */
    public boolean mediate(MessageContext synCtx) {
        
        SynapseLog synLog = getLog(synCtx);

        if (synLog.isTraceOrDebugEnabled()) {
            synLog.traceOrDebug("Start : Out mediator");

            if (synLog.isTraceTraceEnabled()) {
                synLog.traceTrace("Message : " + synCtx.getEnvelope());
            }
        }

        boolean result = true;
        if (test(synCtx)) {
            synLog.traceOrDebug("Current message is outgoing - executing child mediators");
            result = super.mediate(synCtx);

        } else {
            synLog.traceOrDebug("Current message is a request - skipping child mediators");
        }

        synLog.traceOrDebug("End : Out mediator");

        return result;
    }

    /**
     * Apply mediation only on response messages
     *
     * @param synCtx the message context
     * @return MessageContext#isResponse()
     */
    public boolean test(MessageContext synCtx) {
        return synCtx.isResponse();
    }

    @Override
    public boolean isContentAware() {
        return false;
    }
}
