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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package sample;
import java.io.StringWriter;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
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.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
/**
* A little bit of magic code and utility functions to help work with DOM.
*/
class Xutil {
static class NodeBuilder {
String ns;
String name;
NodeBuilder[] children;
String text;
}
/**
* Convert a name and a list of children to a document element.
*/
static Element dom(String ns, String name, final NodeBuilder... nodes) {
return (Element)node(elem(ns, name, nodes), db.newDocument());
}
/**
* Convert a name and children to an element.
*/
static NodeBuilder elem(final String uri, final String n, final NodeBuilder... nodes) {
return new NodeBuilder() {
{
this.ns = uri;
this.name = n;
this.children = nodes;
}
};
}
static NodeBuilder elem(final String n, final NodeBuilder... nodes) {
return new NodeBuilder() {
{
this.name = n;
this.children = nodes;
}
};
}
/**
* Convert a string to a text element.
*/
static NodeBuilder text(final String t) {
return new NodeBuilder() {
{
this.text = t;
}
};
}
private final static DocumentBuilder db = db();
private static DocumentBuilder db() {
try {
return DocumentBuilderFactory.newInstance().newDocumentBuilder();
} catch(ParserConfigurationException e) {
throw new RuntimeException(e);
}
}
private static Element link(final Element e, final Document doc, final NodeBuilder... nodes) {
for(final NodeBuilder c: nodes)
e.appendChild(node(c, doc));
return e;
}
private static Node node(NodeBuilder node, Document doc) {
if(node.text != null)
return doc.createTextNode(node.text);
return link(doc.createElementNS(node.ns, node.name), doc, node.children);
}
/**
* Convert an element to XML.
*/
static TransformerFactory trf = TransformerFactory.newInstance();
static String xml(final Node node) {
try {
final StreamResult r = new StreamResult(new StringWriter());
trf.newTransformer().transform(new DOMSource(node), r);
return r.getWriter().toString();
} catch(TransformerException e) {
throw new RuntimeException(e);
}
}
/**
* Evaluate an xpath expression.
*/
private static XPathFactory xpf = XPathFactory.newInstance();
static String xpath(final String expr, final Node node) {
final XPath xp = xpf.newXPath();
try {
return (String)xp.evaluate(expr, node, XPathConstants.STRING);
} catch(XPathExpressionException e) {
throw new RuntimeException(e);
}
}
}
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