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You will first need to write a class implementing the org.apache.axis2.builder.Builder interface in the Axis2 Kernel module and then override the processDocument method. Within the processDocument method, you can define your specific logic to process the payload content as required and then convert it to SOAP format.

Code Block

language	xml

package org.test.builder;

import org.apache.axiom.om.OMAbstractFactory;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.impl.OMNodeEx;
import org.apache.axiom.om.impl.builder.StAXBuilder;
import org.apache.axiom.om.impl.builder.StAXOMBuilder;
import org.apache.axiom.om.util.StAXParserConfiguration;
import org.apache.axiom.om.util.StAXUtils;
import org.apache.axiom.soap.SOAPBody;
import org.apache.axiom.soap.SOAPEnvelope;
import org.apache.axiom.soap.SOAPFactory;
import org.apache.axis2.AxisFault;
import org.apache.axis2.Constants;
import org.apache.axis2.builder.Builder;
import org.apache.axis2.context.MessageContext;
import org.apache.commons.codec.binary.Base64;

import javax.xml.stream.XMLStreamException;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;

public class CustomBuilderForTextXml implements Builder{
    public OMElement processDocument(InputStream inputStream, String s, MessageContext messageContext) throws AxisFault {
        SOAPFactory soapFactory = OMAbstractFactory.getSOAP11Factory();
        SOAPEnvelope soapEnvelope = soapFactory.getDefaultEnvelope();

        PushbackInputStream pushbackInputStream = new PushbackInputStream(inputStream);

        try {
            int byteVal = pushbackInputStream.read();
            if (byteVal != -1) {
                pushbackInputStream.unread(byteVal);

                javax.xml.stream.XMLStreamReader xmlReader = StAXUtils.createXMLStreamReader(StAXParserConfiguration.SOAP,
                        pushbackInputStream, (String) messageContext.getProperty(Constants.Configuration.CHARACTER_SET_ENCODING));

                StAXBuilder builder = new StAXOMBuilder(xmlReader);
                OMNodeEx documentElement = (OMNodeEx) builder.getDocumentElement();
                documentElement.setParent(null);
                String elementVal = ((OMElement) documentElement).getText();
                byte[]   bytesEncoded = Base64.encodeBase64(elementVal.getBytes());
                ((OMElement) documentElement).setText(new String(bytesEncoded ));
                SOAPBody body = soapEnvelope.getBody();
                body.addChild(documentElement);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } catch (XMLStreamException e) {
            e.printStackTrace();
        }

        return soapEnvelope;
    }
}

Create a JAR file of this class and add it into the classpath of the Axis2 installation, i.e., the <EI_HOME>/lib folder.
To enable your custom message builder for content type text/xml, add the following line in the Message Buillders section in the <EI_HOME>/conf/axis2/axis2.xml file (or <EI_HOME>/conf/axis2/tenant-axis2.xml if you are working in a multi-tenant environment):

Code Block

language	xml

<messageBuilder contentType="text/xml" class="org.apachetest.axis2builder.transport.http.CustomBuilderForTextXml"/>

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Similarly, you can write your own message formatter to manipulate the outgoing payload from the ESBWSO2 EI.

When creating a custom message formatter, you will need to create a class implementing the org.apache.axis2.transport.MessageFormatter interface and then override the writeTo method. You can implement your logic within the writeTo method.

Add the following line in the Message Formatters section in the <EI_HOME>/conf/axis2/axis2.xml file (or <EI_HOME>/conf/axis2/tenant-axis2.xml if you are working in a multi-tenant environment):

Code Block

language	xml

<messageFormatter contentType= "text/xml" class="org.apache.axis2.transport.http.SOAPMessageFormatter" />

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