Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/*
 * 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.parsers.ParserConfigurationException;

import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathFactory;

import org.w3c.dom.Document;

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

    public static Double xpathNumber(String expr, String xml) {
        return xpathNumber(expr, createDocument(xml));
    }

    public static Double xpathNumber(String expr, Document doc) {
        try {
            return (Double) xpath.evaluate(expr, doc,

                    XPathConstants.NUMBER);
        } catch (Exception e) {
            throw new RuntimeException("Cannot evaluate XPath:", e);
        }
    }

    /**
     * Creates new empty org.w3c.dom.Document
     * 
     * @return org.w3c.dom.Document
     * @throws CitationStyleManagerException
     */
    public static Document createDocument() {
        return createDocumentBuilder().newDocument();
    }

    /**
     * Creates new org.w3c.dom.Document
     * 
     * @param xml
     * @return org.w3c.dom.Document
     * @throws RuntimeException
     */
    public static Document createDocument(String xml) {
        try {
            return createDocument(xml.getBytes("UTF-8"));
        } catch (Exception e) {
            throw new RuntimeException("Cannot create Document", e);
        }
    }

    /**
     * Creates new org.w3c.dom.Document
     * 
     * @param xml
     * @return org.w3c.dom.Document
     * @throws CitationStyleManagerException
     * @throws IOException
     * @throws SAXException
     * @throws Exception
     */
    public static Document createDocument(byte[] xml) {
        DocumentBuilder db = createDocumentBuilder();
        try {
            return db.parse(new ByteArrayInputStream(xml), "UTF-8");
        } catch (Exception e) {
            throw new RuntimeException("Cannot create Document", e);
        }

    }

    /**
     * Builds new DocumentBuilder
     * 
     * @return DocumentBuilder
     * @throws CitationStyleManagerException
     */
    public static DocumentBuilder createDocumentBuilder() {
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        dbf.setValidating(false);
        dbf.setIgnoringComments(true);
        dbf.setNamespaceAware(false);

        try {
            return dbf.newDocumentBuilder();
        } catch (ParserConfigurationException e) {
            throw new RuntimeException("Failed to create a document builder factory", e);
        }
    }
}