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package org.apache.camel.builder.xml; |
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import java.io.File; |
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import java.io.IOException; |
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import java.io.InputStream; |
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import java.net.URL; |
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import java.util.HashMap; |
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import java.util.Map; |
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import java.util.Set; |
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import javax.xml.parsers.ParserConfigurationException; |
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import javax.xml.transform.Result; |
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import javax.xml.transform.Source; |
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import javax.xml.transform.Transformer; |
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import javax.xml.transform.TransformerConfigurationException; |
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import javax.xml.transform.stream.StreamSource; |
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import org.apache.camel.Exchange; |
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import org.apache.camel.ExpectedBodyTypeException; |
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import org.apache.camel.Message; |
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import org.apache.camel.Processor; |
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import org.apache.camel.RuntimeTransformException; |
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import org.apache.camel.converter.jaxp.XmlConverter; |
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import static org.apache.camel.util.ObjectHelper.notNull; |
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public class XsltBuilder implements Processor { |
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private Map<String, Object> parameters = new HashMap<String, Object>(); |
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private XmlConverter converter = new XmlConverter(); |
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private Transformer transformer; |
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private ResultHandler resultHandler = new StringResultHandler(); |
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private boolean failOnNullBody = true; |
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public XsltBuilder() { |
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} |
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public XsltBuilder(Transformer transformer) { |
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this.transformer = transformer; |
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} |
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@Override |
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public String toString() { |
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return "XSLT[" + transformer + "]"; |
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} |
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public synchronized void process(Exchange exchange) throws Exception { |
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Transformer transformer = getTransformer(); |
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if (transformer == null) { |
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throw new IllegalArgumentException("No transformer configured!"); |
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} |
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configureTransformer(transformer, exchange); |
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Source source = getSource(exchange); |
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Result result = resultHandler.getResult(); |
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transformer.transform(source, result); |
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resultHandler.setBody(exchange.getIn()); |
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} |
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public static XsltBuilder xslt(Transformer transformer) { |
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return new XsltBuilder(transformer); |
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} |
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public static XsltBuilder xslt(Source xslt) throws TransformerConfigurationException { |
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notNull(xslt, "xslt"); |
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XsltBuilder answer = new XsltBuilder(); |
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answer.setTransformerSource(xslt); |
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return answer; |
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} |
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public static XsltBuilder xslt(File xslt) throws TransformerConfigurationException { |
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notNull(xslt, "xslt"); |
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return xslt(new StreamSource(xslt)); |
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} |
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public static XsltBuilder xslt(URL xslt) throws TransformerConfigurationException, IOException { |
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notNull(xslt, "xslt"); |
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return xslt(xslt.openStream()); |
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} |
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public static XsltBuilder xslt(InputStream xslt) throws TransformerConfigurationException, IOException { |
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notNull(xslt, "xslt"); |
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return xslt(new StreamSource(xslt)); |
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} |
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public XsltBuilder outputBytes() { |
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setResultHandler(new StreamResultHandler()); |
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return this; |
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} |
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public XsltBuilder outputString() { |
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setResultHandler(new StringResultHandler()); |
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return this; |
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} |
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public XsltBuilder outputDOM() { |
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setResultHandler(new DomResultHandler()); |
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return this; |
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} |
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public XsltBuilder parameter(String name, Object value) { |
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parameters.put(name, value); |
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return this; |
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} |
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public Map<String, Object> getParameters() { |
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return parameters; |
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} |
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public void setParameters(Map<String, Object> parameters) { |
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this.parameters = parameters; |
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} |
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public Transformer getTransformer() { |
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return transformer; |
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} |
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public void setTransformer(Transformer transformer) { |
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this.transformer = transformer; |
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} |
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public boolean isFailOnNullBody() { |
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return failOnNullBody; |
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} |
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public void setFailOnNullBody(boolean failOnNullBody) { |
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this.failOnNullBody = failOnNullBody; |
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} |
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public ResultHandler getResultHandler() { |
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return resultHandler; |
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} |
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public void setResultHandler(ResultHandler resultHandler) { |
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this.resultHandler = resultHandler; |
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} |
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public void setTransformerSource(Source source) throws TransformerConfigurationException { |
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setTransformer(converter.getTransformerFactory().newTransformer(source)); |
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} |
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protected Source getSource(Exchange exchange) { |
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Message in = exchange.getIn(); |
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Source source = in.getBody(Source.class); |
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if (source == null) { |
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if (isFailOnNullBody()) { |
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throw new ExpectedBodyTypeException(exchange, Source.class); |
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} else { |
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try { |
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source = converter.toSource(converter.createDocument()); |
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} catch (ParserConfigurationException e) { |
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throw new RuntimeTransformException(e); |
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} |
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} |
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} |
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return source; |
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} |
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protected void configureTransformer(Transformer transformer, Exchange exchange) { |
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transformer.clearParameters(); |
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addParameters(transformer, exchange.getProperties()); |
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addParameters(transformer, exchange.getIn().getHeaders()); |
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addParameters(transformer, getParameters()); |
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transformer.setParameter("exchange", exchange); |
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transformer.setParameter("in", exchange.getIn()); |
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transformer.setParameter("out", exchange.getOut()); |
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} |
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protected void addParameters(Transformer transformer, Map<String, Object> map) { |
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Set<Map.Entry<String, Object>> propertyEntries = map.entrySet(); |
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for (Map.Entry<String, Object> entry : propertyEntries) { |
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transformer.setParameter(entry.getKey(), entry.getValue()); |
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} |
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} |
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} |