Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/******************************************************************************
 * Copyright (c) 2009-2013, Linagora
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *       Linagora - initial API and implementation
 *******************************************************************************/

import javax.xml.xpath.XPath;

import javax.xml.xpath.XPathFactory;

public class Main {
    /**
     * Not sensitive to name spaces (for instance, but not sure either it will be one day).
     */
    private static final XPath X_PATH = XPathFactory.newInstance().newXPath();

    /**
     * Validates a XPath expression.
     * @param xpathExpression the XPath expression to validate
     * @return null if the expression is correct, an error message otherwise
     */
    public static String validateXPathExpression(String xpathExpression) {

        String msg = null;
        try {
            X_PATH.compile(xpathExpression);

        } catch (Exception e) {
            String cause = null;
            if (e.getCause() != null)
                e.getCause().getMessage();
            else
                cause = e.getMessage();

            cause = cause == null ? "" : " " + cause;
            msg = "Invalid XPath expression." + cause;
        }

        return msg;
    }
}