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import java.util.Arrays;
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import java.util.Collections;
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import java.util.Iterator;
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import javax.xml.XMLConstants;
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import javax.xml.namespace.NamespaceContext;
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import javax.xml.xpath.XPath;
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import net.sf.saxon.xpath.XPathFactoryImpl;
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public class XPathCompile {
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public static void main(String[] args) throws Exception {
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XPath xpath = new XPathFactoryImpl().newXPath();
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xpath.setNamespaceContext(namespaceContext);
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xpath.compile("//*:x");
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}
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private static final NamespaceContext namespaceContext = new NamespaceContext() {
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@Override
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public String getNamespaceURI(String prefix) {
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if (prefix == null)
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throw new IllegalArgumentException();
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if (prefix.equals(XMLConstants.XML_NS_PREFIX))
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return XMLConstants.XML_NS_URI;
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if (prefix.equals(XMLConstants.XMLNS_ATTRIBUTE))
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return XMLConstants.XMLNS_ATTRIBUTE_NS_URI;
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return XMLConstants.NULL_NS_URI;
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}
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@Override
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public String getPrefix(String namespaceURI) {
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if (namespaceURI == null)
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throw new IllegalArgumentException();
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if (namespaceURI.equals(XMLConstants.NULL_NS_URI))
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return XMLConstants.DEFAULT_NS_PREFIX;
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if (namespaceURI.equals(XMLConstants.XML_NS_URI))
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return XMLConstants.XML_NS_PREFIX;
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if (namespaceURI.equals(XMLConstants.XMLNS_ATTRIBUTE_NS_URI))
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return XMLConstants.XMLNS_ATTRIBUTE;
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return null;
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}
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@Override
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public Iterator getPrefixes(String namespaceURI) {
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String prefix = getPrefix(namespaceURI);
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return prefix == null ? Collections.emptyIterator() : Arrays.asList(prefix).iterator();
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}
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};
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}
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