127 lines
2.9 KiB
Java
127 lines
2.9 KiB
Java
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package net.sourceforge.tuned;
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import java.util.AbstractList;
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import java.util.List;
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import javax.xml.xpath.XPathConstants;
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import javax.xml.xpath.XPathExpression;
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import javax.xml.xpath.XPathExpressionException;
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import javax.xml.xpath.XPathFactory;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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public final class XPathUtilities {
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public static Node selectNode(String xpath, Object node) {
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try {
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return (Node) getXPath(xpath).evaluate(node, XPathConstants.NODE);
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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public static List<Node> selectNodes(String xpath, Object node) {
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try {
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return new NodeListDecorator((NodeList) getXPath(xpath).evaluate(node, XPathConstants.NODESET));
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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public static String selectString(String xpath, Object node) {
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try {
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return ((String) getXPath(xpath).evaluate(node, XPathConstants.STRING)).trim();
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} catch (Exception e) {
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throw new RuntimeException(e);
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}
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}
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/**
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* @param nodeName search for nodes with this name
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* @param parentNode search in the child nodes of this nodes
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* @return text content of the child node or null if no child with the given name was found
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*/
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public static Node getChild(String nodeName, Node parentNode) {
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for (Node child : new NodeListDecorator(parentNode.getChildNodes())) {
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if (nodeName.equals(child.getNodeName()))
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return child;
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}
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return null;
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}
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/**
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* Get text content of the first child node matching the given node name. Use this method
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* instead of {@link #selectString(String, Object)} whenever xpath support is not required,
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* because it is much faster, especially for large documents.
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*
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* @param nodeName search for nodes with this name
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* @param parentNode search in the child nodes of this nodes
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* @return text content of the child node or null if no child with the given name was found
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*/
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public static String getTextContent(String nodeName, Node parentNode) {
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Node child = getChild(nodeName, parentNode);
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if (child == null)
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return null;
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return child.getTextContent();
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}
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public static int selectInteger(String xpath, Object node) {
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return Integer.parseInt(selectString(xpath, node));
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}
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public static boolean exists(String xpath, Object node) {
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return selectNode(xpath, node) != null;
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}
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private static XPathExpression getXPath(String xpath) throws XPathExpressionException {
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return XPathFactory.newInstance().newXPath().compile(xpath);
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}
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/**
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* Dummy constructor to prevent instantiation.
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*/
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private XPathUtilities() {
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throw new UnsupportedOperationException();
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}
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protected static class NodeListDecorator extends AbstractList<Node> {
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private final NodeList nodes;
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public NodeListDecorator(NodeList nodes) {
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this.nodes = nodes;
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}
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@Override
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public Node get(int index) {
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return nodes.item(index);
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}
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@Override
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public int size() {
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return nodes.getLength();
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}
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}
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}
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