# EqualSerializer.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.axiom.om.OMElement;
    import org.apache.synapse.commons.evaluators.*;

    /**
     * Serialize the {@link EqualEvaluator} to the XML configuration defined in
     * the {@link EqualFactory}.
     */
    public class EqualSerializer extends TextProcessingEvaluatorSerializer {

        public OMElement serialize(OMElement parent, Evaluator evaluator) throws EvaluatorException {

            if (!(evaluator instanceof EqualEvaluator)) {
                throw new IllegalArgumentException("Evalutor must be an EqualEvalutor");
            }

            EqualEvaluator equalEvaluator = (EqualEvaluator) evaluator;
            OMElement equalElement  = fac.createOMElement(EvaluatorConstants.EQUAL, EvaluatorConstants.SYNAPSE_NAMESPACE, EvaluatorConstants.EMPTY_PREFIX);
            serializeSourceTextRetriever(equalEvaluator.getTextRetriever(), equalElement);

            equalElement.addAttribute(fac.createOMAttribute(EvaluatorConstants.VALUE, nullNS,
                    equalEvaluator.getValue()));

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

            return equalElement;
        }
    }