Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/* ************************************************************************** *
 * See the NOTICE file distributed with this work for additional information
 * regarding copyright ownership.
 *
 * This file is licensed 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.
 * ************************************************************************** */

import java.util.Iterator;

import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
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;
import org.w3c.dom.NodeList;

public class Main {
    public static Element getChild(Element e, String path) throws Exception {
        Iterable<Node> list = eval(e, path);
        if (list == null) {
            return null;
        }
        Iterator<Node> iterator = list.iterator();
        return (Element) (iterator.hasNext() ? iterator.next() : null);
    }

    public static Iterable<Node> eval(Document doc, String path) throws XPathExpressionException {
        return eval(doc.getDocumentElement(), path);
    }

    public static Iterable<Node> eval(Node element, String path) throws XPathExpressionException {
        XPathFactory factory = XPathFactory.newInstance();
        XPath xpath = factory.newXPath();
        // xpath.setNamespaceContext(new NamespaceContext() {
        //
        // /**
        // * @WARNING this code will work only if the namespace is present at
        // * each node of the xml dom and within the xpath queries.
        // * Otherwise you can fix like that:
        // *
        // * <pre>
        // * // FIXME: this is a
        // * hack!! if ("atom".equals(prefix)) return
        // * "http://www.w3.org/2005/Atom"; but it wont work with
        // * </pre>
        // *
        // * different namespaces
        // * @see
        // javax.xml.namespace.NamespaceContext#getNamespaceURI(java.lang.String)
        // */
        // public String getNamespaceURI(String prefix) {
        // String namespace = DOMUtil.lookupNamespaceURI(node, prefix);
        // return namespace;
        // }
        //
        // public String getPrefix(String namespaceURI) {
        // String prefix = node.lookupPrefix(namespaceURI);
        // return prefix;
        // }
        //
        // public Iterator<?> getPrefixes(final String namespaceURI) {
        // return new Iterator<String>() {
        // String ns = getPrefix(namespaceURI);
        //
        // public boolean hasNext() {
        // return ns != null;
        // }
        //
        // public String next() {
        // String r = ns;
        // ns = null;
        // return r;
        // }
        //
        // public void remove() {
        // }
        //
        // };
        // }
        // });
        XPathExpression expr = xpath.compile(path);
        final NodeList result = (NodeList) expr.evaluate(element, XPathConstants.NODESET);
        return new Iterable<Node>() {
            public Iterator<Node> iterator() {
                return new Iterator<Node>() {
                    int len = result.getLength();

                    int pos;

                    public boolean hasNext() {
                        return pos < len;
                    }

                    public Node next() {
                        if (pos >= len) {
                            return null;
                        }
                        return result.item(pos++);
                    }

                    public void remove() {
                        throw new IllegalAccessError();
                    }

                };
            }
        };
    }
}