Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright 2010-2016 ksyun.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://ksyun.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

import java.lang.reflect.Method;

public class Main {
    /** The default property name to load the Xalan DTM manager. */
    private static final String DTM_MANAGER_DEFAULT_PROP_NAME = "com.sun.org.apache.xml.internal.dtm.DTMManager";
    /** The FQCN of the internal XPathContext class. */
    private static final String XPATH_CONTEXT_CLASS_NAME = "com.sun.org.apache.xpath.internal.XPathContext";
    /** The FQCN of the desired DTMManager implementation. */
    private static final String DTM_MANAGER_IMPL_CLASS_NAME = "com.sun.org.apache.xml.internal.dtm.ref.DTMManagerDefault";

    /**
     * Used to optimize performance by avoiding expensive file access every time
     * a DTMManager is constructed as a result of constructing a Xalan xpath
     * context!
     */
    private static void speedUpDTMManager() throws Exception {
        // https://github.com/aws/aws-sdk-java/issues/238
        // http://stackoverflow.com/questions/6340802/java-xpath-apache-jaxp-implementation-performance
        if (System.getProperty(DTM_MANAGER_DEFAULT_PROP_NAME) == null) {
            Class<?> XPathContextClass = Class.forName(XPATH_CONTEXT_CLASS_NAME);
            Method getDTMManager = XPathContextClass.getMethod("getDTMManager");
            Object XPathContext = XPathContextClass.newInstance();
            Object dtmManager = getDTMManager.invoke(XPathContext);

            if (DTM_MANAGER_IMPL_CLASS_NAME.equals(dtmManager.getClass().getName())) {
                // This would avoid the file system to be accessed every time
                // the internal XPathContext is instantiated.
                System.setProperty(DTM_MANAGER_DEFAULT_PROP_NAME, DTM_MANAGER_IMPL_CLASS_NAME);
            }
        }
    }
}