Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/**
 * This file is protected by Copyright. Please refer to the COPYRIGHT file
 * distributed with this source distribution.
 *
 * This file is part of REDHAWK.
 *
 * REDHAWK is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 *
 * REDHAWK is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/.
 */

import javax.xml.xpath.XPath;

import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

public class Main {
    private static XPath xPath = null;

    /** Builds an XPath. This is identical to calling
     *  <tt>XPathFactory.newInstance().newXPath().compile(expression)</tt> except
     *  that rather than throwing an {@link XPathExpressionException} it throws an
     *  {@link AssertionError}. <br>
     *  <br>
     *  This is intended for use with pre-defined XPaths stored as constants,
     *  where runtime exceptions should not be possible.
     *  @param expression The XPath expression to compile.
     *  @throws AssertionError If the nested call to <tt>XPath.newInstance(path)</tt>
     *                         throws an {@link XPathExpressionException}.
     */
    public static synchronized XPathExpression xpath(String expression) {
        if (xPath == null)
            xPath = XPathFactory.newInstance().newXPath();

        try {
            return xPath.compile(expression);
        } catch (XPathExpressionException e) {
            throw new AssertionError("Error initializing XPath instance for '" + expression + "': " + e);
        }
    }
}