Java XPath Select xpathNodeList(String expr, Document doc)

Description

xpath Node List

License

Open Source License

Declaration

public static NodeList xpathNodeList(String expr, Document doc) throws Exception 

Method Source Code

//package com.java2s;
/*//from   ww  w.  ja v  a 2 s .c  om
 * CDDL HEADER START
 * 
 * The contents of this file are subject to the terms of the Common Development and Distribution
 * License, Version 1.0 only (the "License"). You may not use this file except in compliance with
 * the License.
 * 
 * You can obtain a copy of the license at license/ESCIDOC.LICENSE or
 * http://www.escidoc.org/license. See the License for the specific language governing permissions
 * and limitations under the License.
 * 
 * When distributing Covered Code, include this CDDL HEADER in each file and include the License
 * file at license/ESCIDOC.LICENSE. If applicable, add the following below this CDDL HEADER, with
 * the fields enclosed by brackets "[]" replaced with your own identifying information: Portions
 * Copyright [yyyy] [name of copyright owner]
 * 
 * CDDL HEADER END
 */

import java.io.ByteArrayInputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class Main {
    private static XPath xpath = XPathFactory.newInstance().newXPath();

    /***************/
    public static NodeList xpathNodeList(String expr, String xml) throws Exception {
        return xpathNodeList(expr, createDocument(xml));
    }

    public static NodeList xpathNodeList(String expr, Document doc) throws Exception {
        return (NodeList) xpath.evaluate(expr, doc, XPathConstants.NODESET);
    }

    public static Document createDocument(String xml) throws Exception {
        DocumentBuilder db = createDocumentBuilder();
        return db.parse(new ByteArrayInputStream(xml.getBytes("UTF-8")), "UTF-8");
    }

    public static Document createDocument(Node sourceNode) throws Exception {
        Document doc = createDocumentBuilder().newDocument();
        Node source;
        if (sourceNode.getNodeType() == Node.DOCUMENT_NODE) {
            source = ((Document) sourceNode).getDocumentElement();
        } else {
            source = sourceNode;
        }

        Node node = doc.importNode(source, true);
        doc.appendChild(node);

        return doc;
    }

    public static DocumentBuilder createDocumentBuilder() throws Exception {
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        dbf.setValidating(false);
        dbf.setIgnoringComments(true);
        return dbf.newDocumentBuilder();
    }
}

Related

1. selectStrings(String xpath, Object node)
2. selectXPathString(final String xPath, final Node inNode, final String nsuri, final String pre)
3. xmlSelectNodes(Node node, String xpathExpression)
4. XPathAPI_selectNodeList(Document doc, String xpath, Node namespaceNode)
5. xpathNode(String expr, Document doc)
6. xpathOrNull(Document doc, String xp)
7. xpathString(String expr, Document doc)
8. xpathToNode(Document document, String xpathExpression)