Traverses the given DOM, relative to all the URIs in the uri attributes of each Element. - Java XML

Java examples for XML:XML Attribute

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Description

Traverses the given DOM, relative to all the URIs in the uri attributes of each Element.

Demo Code


//package com.java2s;
import org.w3c.dom.*;

import java.net.URI;

public class Main {
    /**//from   ww  w .  java 2  s .c  om
     * Traverses the given DOM, relativising all the URIs in the
     * <code>uri</code> attributes of each <code>Element</code>.
     *
     * <p>The (uri-attribute) nodes in the input DOM are modified by this
     * method; if this is a problem, use {@link
     * org.w3c.dom.Node#cloneNode} first.
     *
     * @param n a node containing the DOM whose URIs are to be
     * relativized.  If this is null, the method immediately returns null
     * @param baseURI the URI relative to which the DOM is to be
     * relativised.  If this is null, then the input node is
     * immediately returned unchanged.
     * @param attname the attribute name to be used.  If null, this
     * defaults to <code>uri</code>
     * @return the input node
     * @see java.net.URI#relativize
     */
    public static Node relativizeDOM(Node n, URI baseURI, String attname) {
        if (n == null || baseURI == null)
            return n;
        if (attname == null)
            attname = "uri";
        NamedNodeMap nm = n.getAttributes();
        if (nm != null)
            for (int i = 0; i < nm.getLength(); i++) {
                Attr att = (Attr) nm.item(i);
                if (att.getName().equals(attname)) {
                    String oldAttValue = att.getValue();
                    try {
                        att.setValue(baseURI.relativize(
                                new URI(oldAttValue)).toString());
                    } catch (java.net.URISyntaxException ex) {
                        // Malformed URI -- restore the attribute to its original value
                        att.setValue(oldAttValue);
                    }
                }
            }
        for (Node kid = n.getFirstChild(); kid != null; kid = kid
                .getNextSibling())
            relativizeDOM(kid, baseURI, attname);
        return n;
    }
}

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