Examples with StreamResultBuilder org.apache.synapse.util.jaxp.StreamResultBuilder used on opensource projects

Example 1 with StreamResultBuilder

use of org.apache.synapse.util.jaxp.StreamResultBuilder in project wso2-synapse by wso2.

the class XSLTMediator method performXSLT.

/**
 * Perform actual XSLT transformation
 * @param synCtx current message
 * @param synLog the logger to be used
 */
private void performXSLT(MessageContext synCtx, SynapseLog synLog) {
    OMNode sourceNode = source.selectOMNode(synCtx, synLog);
    boolean isSoapEnvelope = (sourceNode == synCtx.getEnvelope());
    boolean isSoapBody = (sourceNode == synCtx.getEnvelope().getBody());
    boolean isSoapHeader = (sourceNode == synCtx.getEnvelope().getHeader());
    // Derive actual key from message context
    String generatedXsltKey = xsltKey.evaluateValue(synCtx);
    // get templates from generatedXsltKey
    Templates cachedTemplates = null;
    if (synLog.isTraceTraceEnabled()) {
        synLog.traceTrace("Transformation source : " + sourceNode.toString());
    }
    // determine if it is needed to create or create the template
    if (isCreationOrRecreationRequired(synCtx)) {
        // many threads can see this and come here for acquiring the lock
        synchronized (transformerLock) {
            // only first thread should create the template
            if (isCreationOrRecreationRequired(synCtx)) {
                cachedTemplates = createTemplate(synCtx, synLog, generatedXsltKey);
            } else {
                cachedTemplates = cachedTemplatesMap.get(generatedXsltKey);
            }
        }
    } else {
        // If already cached template then load it from cachedTemplatesMap
        synchronized (transformerLock) {
            cachedTemplates = cachedTemplatesMap.get(generatedXsltKey);
        }
    }
    try {
        // perform transformation
        Transformer transformer = null;
        try {
            transformer = cachedTemplates.newTransformer();
        } catch (NullPointerException ex) {
            handleException("Unable to create Transformer using cached template", ex, synCtx);
        }
        if (!properties.isEmpty()) {
            // set the parameters which will pass to the Transformation
            applyProperties(transformer, synCtx, synLog);
        }
        transformer.setErrorListener(new ErrorListenerImpl(synLog, XSLT_TRANSFORMATION_ACTIVITY));
        String outputMethod = transformer.getOutputProperty(OutputKeys.METHOD);
        String encoding = transformer.getOutputProperty(OutputKeys.ENCODING);
        if (synLog.isTraceOrDebugEnabled()) {
            synLog.traceOrDebug("output method: " + outputMethod + "; encoding: " + encoding);
        }
        ResultBuilderFactory.Output output;
        if ("text".equals(outputMethod)) {
            synLog.traceOrDebug("Processing non SOAP/XML (text) transformation result");
            output = ResultBuilderFactory.Output.TEXT;
        } else if (isSoapEnvelope) {
            output = ResultBuilderFactory.Output.SOAP_ENVELOPE;
        } else {
            output = ResultBuilderFactory.Output.ELEMENT;
        }
        SynapseEnvironment synEnv = synCtx.getEnvironment();
        ResultBuilder resultBuilder = resultBuilderFactory.createResultBuilder(synEnv, output);
        SourceBuilder sourceBuilder = sourceBuilderFactory.createSourceBuilder(synEnv);
        if (synLog.isTraceOrDebugEnabled()) {
            synLog.traceOrDebug("Using " + sourceBuilder.getClass().getName());
            synLog.traceOrDebug("Using " + resultBuilder.getClass().getName());
        }
        try {
            transformer.transform(sourceBuilder.getSource((OMElement) sourceNode), resultBuilder.getResult());
        } finally {
            sourceBuilder.release();
        }
        synLog.traceOrDebug("Transformation completed - processing result");
        /**
         * If user have set transform.xslt.result.disableBuild property to true, we do not build the message to
         * OMElement,
         */
        if (targetPropertyName != null && resultBuilder instanceof StreamResultBuilder && synCtx.getProperty(TRANSFORM_XSLT_RESULT_DISABLE_BUILD) != null && synCtx.getProperty(TRANSFORM_XSLT_RESULT_DISABLE_BUILD) instanceof String && "true".equalsIgnoreCase((String) synCtx.getProperty(TRANSFORM_XSLT_RESULT_DISABLE_BUILD))) {
            // add result XML string as a message context property to the message
            if (synLog.isTraceOrDebugEnabled()) {
                synLog.traceOrDebug("Adding result string as message context property : " + targetPropertyName);
            }
            synCtx.setProperty(targetPropertyName, ((StreamResultBuilder) resultBuilder).getResultAsString());
            return;
        }
        // get the result OMElement
        OMElement result = null;
        try {
            result = resultBuilder.getNode(encoding == null ? null : Charset.forName(encoding));
        } catch (Exception e) {
            throw new SynapseException("Unable to create an OMElement using XSLT result ", e);
        }
        if (synLog.isTraceTraceEnabled()) {
            synLog.traceTrace("Transformation result : " + result.toString());
        }
        if (targetPropertyName != null) {
            // add result XML as a message context property to the message
            if (synLog.isTraceOrDebugEnabled()) {
                synLog.traceOrDebug("Adding result as message context property : " + targetPropertyName);
            }
            synCtx.setProperty(targetPropertyName, result);
        } else {
            if (synLog.isTraceOrDebugEnabled()) {
                synLog.traceOrDebug("Replace " + (isSoapEnvelope ? "SOAP envelope" : isSoapBody ? "SOAP body" : "node") + " with result");
            }
            if (isSoapEnvelope) {
                try {
                    synCtx.setEnvelope((SOAPEnvelope) result);
                } catch (AxisFault ex) {
                    handleException("Unable to replace SOAP envelope with result", ex, synCtx);
                }
            } else if (isSoapBody) {
                for (Iterator itr = synCtx.getEnvelope().getBody().getChildElements(); itr.hasNext(); ) {
                    OMElement child = (OMElement) itr.next();
                    child.detach();
                }
                for (Iterator itr = result.getChildElements(); itr.hasNext(); ) {
                    OMElement child = (OMElement) itr.next();
                    synCtx.getEnvelope().getBody().addChild(child);
                }
            } else if (isSoapHeader) {
                for (Iterator itr = synCtx.getEnvelope().getHeader().getChildElements(); itr.hasNext(); ) {
                    OMElement child = (OMElement) itr.next();
                    child.detach();
                }
                for (Iterator itr = result.getChildElements(); itr.hasNext(); ) {
                    OMElement child = (OMElement) itr.next();
                    synCtx.getEnvelope().getHeader().addChild(child);
                }
            } else {
                sourceNode.insertSiblingAfter(result);
                sourceNode.detach();
            }
        }
    } catch (TransformerException e) {
        handleException("Error performing XSLT transformation using : " + xsltKey, e, synCtx);
    }
}