# EqualFactory.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
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    package org.apache.synapse.commons.evaluators.config;

    import org.apache.synapse.commons.evaluators.Evaluator;
    import org.apache.synapse.commons.evaluators.EvaluatorException;
    import org.apache.synapse.commons.evaluators.EqualEvaluator;
    import org.apache.synapse.commons.evaluators.EvaluatorConstants;
    import org.apache.synapse.commons.evaluators.source.SourceTextRetriever;
    import org.apache.axiom.om.OMElement;
    import org.apache.axiom.om.OMAttribute;

    import javax.xml.namespace.QName;

    /**
     * <p> This factory creates a {@link EqualEvaluator}. This factory expects the
     * following XML configuration.</p>
     * <pre>
     * &lt;equal type=&quot;header | param | url&quot; source=&quot;&quot; value=&quot;&quot;/&gt;
     * </pre>
     */
    public class EqualFactory extends TextProcessingEvaluatorFactory {

        public Evaluator create(OMElement e) throws EvaluatorException {
            EqualEvaluator equal = new EqualEvaluator();
            SourceTextRetriever textRetriever = getSourceTextRetriever(e);
            equal.setTextRetriever(textRetriever);

            OMAttribute valueAttr = e.getAttribute(new QName(EvaluatorConstants.VALUE));

            if (valueAttr == null) {
                handleException(EvaluatorConstants.VALUE + " attribute is required");
                return null;
            }

            equal.setValue(valueAttr.getAttributeValue());
            return equal;
        }
    }