com.github.simy4.xpath.dom4j.spi.Dom4jNavigatorSpi Maven / Gradle / Ivy

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Convenient utility to build XML models by evaluating XPath expressions

There is a newer version: 2.3.9

package com.github.simy4.xpath.dom4j.spi;

import com.github.simy4.xpath.XmlBuilderException;
import com.github.simy4.xpath.dom4j.navigator.Dom4jNavigator;
import com.github.simy4.xpath.dom4j.navigator.node.Dom4jAttribute;
import com.github.simy4.xpath.dom4j.navigator.node.Dom4jDocument;
import com.github.simy4.xpath.dom4j.navigator.node.Dom4jElement;
import com.github.simy4.xpath.dom4j.navigator.node.Dom4jNode;
import com.github.simy4.xpath.navigator.Navigator;
import com.github.simy4.xpath.spi.Effect;
import com.github.simy4.xpath.spi.NavigatorSpi;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.Node;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

/**
 * DOM4J model navigator extension SPI.
 */
public class Dom4jNavigatorSpi implements NavigatorSpi {

    private static final Set SUPPORTED_NODE_TYPES = new HashSet(
            Arrays.asList(Node.DOCUMENT_NODE, Node.ELEMENT_NODE, Node.ATTRIBUTE_NODE));

    @Override
    public boolean canHandle(Object o) {
        return o instanceof Node && SUPPORTED_NODE_TYPES.contains(((Node) o).getNodeType())
                && null != ((Node) o).getDocument();
    }

    @Override
    public  T process(T xml, Iterable effects) throws XmlBuilderException {
        if (!canHandle(xml)) {
            throw new IllegalArgumentException("XML model is not supported");
        }
        final Node xmlNode = (Node) xml;
        final Dom4jNode node;
        switch (xmlNode.getNodeType()) {
            case Node.DOCUMENT_NODE:
                node = new Dom4jDocument((Document) xmlNode);
                break;
            case Node.ELEMENT_NODE:
                node = new Dom4jElement((Element) xmlNode);
                break;
            case Node.ATTRIBUTE_NODE:
                node = new Dom4jAttribute((Attribute) xmlNode);
                break;
            default:
                throw new IllegalArgumentException("XML node type is not supported");
        }
        final Navigator navigator = new Dom4jNavigator(xmlNode);
        for (Effect effect : effects) {
            effect.perform(navigator, node);
        }
        return xml;
    }

}