# SOAPEnvelopeTextRetriever.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.source;

    import org.apache.synapse.commons.evaluators.EvaluatorContext;
    import org.apache.synapse.commons.evaluators.EvaluatorException;
    import org.apache.axiom.soap.SOAPEnvelope;
    import org.apache.axiom.om.xpath.AXIOMXPath;
    import org.apache.axiom.om.impl.llom.OMTextImpl;
    import org.apache.axiom.om.impl.llom.OMElementImpl;
    import org.apache.axiom.om.impl.llom.OMDocumentImpl;
    import org.apache.axiom.om.OMAttribute;
    import org.jaxen.JaxenException;

    import java.util.List;

    public class SOAPEnvelopeTextRetriever implements SourceTextRetriever {

        private String source;
        private AXIOMXPath compiledXPath;

        public SOAPEnvelopeTextRetriever(String source) {
            this.source = source;
        }

        public String getSourceText(EvaluatorContext context) throws EvaluatorException {
            SOAPEnvelope envelope = context.getMessageContext().getEnvelope();
            Object result;

            try {
                if (compiledXPath == null) {
                    compiledXPath = new AXIOMXPath(source);
                }
                result = compiledXPath.evaluate(envelope);
            } catch (JaxenException e) {
                throw new EvaluatorException("Error while parsing the XPath expression: " + source, e);
            }

            if (result instanceof List) {
                List list = (List) result;
                if (list.size() == 1 && list.get(0) == null) {
                    return null;
                }

                StringBuffer textValue = new StringBuffer();
                for (Object o : list) {
                    if (o instanceof OMTextImpl) {
                        textValue.append(((OMTextImpl) o).getText());

                    } else if (o instanceof OMElementImpl) {
                        String s = ((OMElementImpl) o).getText();
                        if (s.trim().length() == 0) {
                            s = o.toString();
                        }
                        textValue.append(s);

                    } else if (o instanceof OMDocumentImpl) {
                        textValue.append(((OMDocumentImpl) o).getOMDocumentElement().toString());
                    } else if (o instanceof OMAttribute) {
                        textValue.append(((OMAttribute) o).getAttributeValue());
                    }
                }

                return textValue.toString();

            } else {
                return result.toString();
            }
        }

        public String getSource() {
            return source;
        }
    }