# ConditionSerializer.java

    /*
     *  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.commons.evaluators.config;

    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.apache.axiom.om.OMFactory;
    import org.apache.axiom.om.OMAbstractFactory;
    import org.apache.axiom.om.OMNamespace;
    import org.apache.axiom.om.OMElement;
    import org.apache.synapse.commons.evaluators.Condition;
    import org.apache.synapse.commons.evaluators.EvaluatorConstants;
    import org.apache.synapse.commons.evaluators.EvaluatorException;

    import javax.xml.namespace.QName;

    /**
     * Serialize the {@link Condition} to the XML configuration defined in
     * the {@link ConditionFactory}.
     */
    public class ConditionSerializer {
        private static Log log = LogFactory.getLog(ConditionSerializer.class);

        private static final OMFactory fac = OMAbstractFactory.getOMFactory();

        private static final OMNamespace nullNS = fac.createOMNamespace("", "");

        public OMElement serializer(OMElement parent, Condition condition) throws EvaluatorException {
            OMElement conditionElement = fac.createOMElement(new QName(EvaluatorConstants.CONDITION));

            conditionElement.addAttribute(
                    fac.createOMAttribute(EvaluatorConstants.PRIORITY, nullNS,
                            condition.getPriority() + ""));

            EvaluatorSerializer serializer =
                    EvaluatorSerializerFinder.getInstance().getSerializer(
                            condition.getEvaluator().getName());

            if (serializer != null) {
                serializer.serialize(conditionElement, condition.getEvaluator());
            } else {
                String msg = "Couldn't find the serializer for evaliator: " +
                        condition.getEvaluator().getName();
                log.error(msg);
                throw new EvaluatorException(msg);
            }

            if (parent != null) {
                parent.addChild(conditionElement);
            }

            return conditionElement;
        }
    }