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Willem Otten
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Oct 20, 2024
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103 changes: 103 additions & 0 deletions
103
XGenerate/src/main/java/com/xbreeze/xgenerate/utils/SaxonXMLUtils.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| package com.xbreeze.xgenerate.utils; | ||
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| import java.io.StringWriter; | ||
| import java.util.ArrayList; | ||
| import java.util.Iterator; | ||
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| import org.w3c.dom.Document; | ||
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| import com.xbreeze.xgenerate.config.NamespaceConfig; | ||
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| import javax.xml.transform.Transformer; | ||
| import javax.xml.transform.TransformerException; | ||
| import javax.xml.transform.TransformerFactory; | ||
| import javax.xml.transform.dom.DOMSource; | ||
| import javax.xml.transform.stream.StreamResult; | ||
| import javax.xml.xpath.XPathExpressionException; | ||
| import javax.xml.namespace.NamespaceContext; | ||
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| import net.sf.saxon.xpath.XPathEvaluator; | ||
| import net.sf.saxon.xpath.XPathExpressionImpl; | ||
| import net.sf.saxon.xpath.XPathFactoryImpl; | ||
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| public class SaxonXMLUtils { | ||
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| private XPathEvaluator _xpath = null; | ||
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| public static String XmlDocumentToString(Document doc) throws XmlException { | ||
| //Transform the preprocessed document to string and store it in the model object. | ||
| DOMSource domSource = new DOMSource(doc); | ||
| StringWriter writer = new StringWriter(); | ||
| StreamResult result = new StreamResult(writer); | ||
| TransformerFactory tf = TransformerFactory.newInstance(); | ||
| Transformer transformer; | ||
| try { | ||
| transformer = tf.newTransformer(); | ||
| transformer.transform(domSource, result); | ||
| } catch (TransformerException e) { | ||
| throw new XmlException( | ||
| String.format("Error transforming document to string: %s", e.getMessage()) | ||
| ); | ||
| } | ||
| return writer.toString(); | ||
| } | ||
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| //Evaluate the xpath expression and return the result as an XPathExpressionImpl object | ||
| public XPathExpressionImpl getXPathExpression(String xPathExpression) throws XPathExpressionException { | ||
| return(XPathExpressionImpl)this.getXPathEvaluator().compile(xPathExpression); | ||
| } | ||
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| //Return the XPathEvaluator, if it is not yet initialized, create a new one | ||
| public XPathEvaluator getXPathEvaluator() { | ||
| if (this._xpath == null) { | ||
| XPathFactoryImpl xPathfactory = new XPathFactoryImpl(); | ||
| this._xpath = (XPathEvaluator) xPathfactory.newXPath(); | ||
| } | ||
| return this._xpath; | ||
| } | ||
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| public void setNamespaces(ArrayList<NamespaceConfig> namespaces) { | ||
| // If namespaces are defined, create a namespace context object and set it on the xpath object. | ||
| if (namespaces != null && namespaces.size() > 0) { | ||
| ModelNamespaceContext nsContext = new ModelNamespaceContext(namespaces); | ||
| this.getXPathEvaluator().setNamespaceContext(nsContext); | ||
| } | ||
| } | ||
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| // helper class to deal with namespace aware preprocessing | ||
| private static class ModelNamespaceContext implements NamespaceContext { | ||
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| private ArrayList<NamespaceConfig> namespaces; | ||
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| public ModelNamespaceContext (ArrayList<NamespaceConfig> namespaces) { | ||
| this.namespaces = namespaces; | ||
| } | ||
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| @Override | ||
| public String getNamespaceURI(String prefix) { | ||
| for (NamespaceConfig ns: this.namespaces) { | ||
| if (ns.getPrefix().equalsIgnoreCase(prefix)) { | ||
| return ns.getNamespace(); | ||
| } | ||
| } | ||
| return null; | ||
| } | ||
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| @Override | ||
| public String getPrefix(String namespaceURI) { | ||
| for (NamespaceConfig ns: this.namespaces) { | ||
| if (ns.getNamespace().equalsIgnoreCase(namespaceURI)) { | ||
| return ns.getPrefix(); | ||
| } | ||
| } | ||
| return null; | ||
| } | ||
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| @Override | ||
| public Iterator<String> getPrefixes(String namespaceURI) { | ||
| // TODO Auto-generated method stub | ||
| return null; | ||
| } | ||
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| } | ||
| } |