Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

import javax.annotation.concurrent.GuardedBy;

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

public class Main {
    /**
     * Lock to guard {@code newInstance} methods of {@code XPathFactory} class
     * which is documented to be neither thread-safe and re-enterant.
     * 
     * @see javax.xml.xpath.XPathFactory
     */
    private final static Lock xpathFactoryLock = new ReentrantLock();

    @GuardedBy("xpathFactoryLock")
    public static XPath createNewXPathInstance() {
        XPathFactory factory = null;

        xpathFactoryLock.lock();
        try {
            factory = XPathFactory.newInstance();
        } finally {
            xpathFactoryLock.unlock();
        }

        return factory.newXPath();
    }
}