Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * MIT License
 * Copyright (c) 2016 Estonian Information System Authority (RIA)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import javax.xml.xpath.*;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Main {
    /**
     * Evaluates the XPath expression in the specified context and returns the found items as a List.
     *
     * @param node       the XML document to evaluate
     * @param expression the compiled XPath expression
     * @return the list of elements found
     */
    public static List<String> getListValue(Node node, XPathExpression expression) {
        try {
            NodeList nodeList = (NodeList) expression.evaluate(node, XPathConstants.NODESET);
            List<String> list = new ArrayList<String>(nodeList.getLength());
            for (int i = 0; i < nodeList.getLength(); i++) {
                Node item = nodeList.item(i);
                list.add(item.getFirstChild().getNodeValue());
            }
            return list;
        } catch (XPathExpressionException e) {
            // Try to evaluate in string context:
            String value = getStringValue(node, expression);
            if (value != null) {
                List<String> list = new ArrayList<String>(1);
                list.add(value);
                return list;
            }
            return Collections.emptyList();
        }
    }

    /**
     * Evaluates the XPath expression in the specified context and returns whether such element was found.
     *
     * @param node       the XML document to evaluate
     * @param expression the compiled XPath expression
     * @return <code>true</code> if the given expression evaluates to an existing element in the given node,
     * <code>false</code> otherwise
     */
    public static boolean evaluate(Node node, XPathExpression expression) {
        try {
            Boolean result = (Boolean) expression.evaluate(node, XPathConstants.BOOLEAN);
            return result != null && result;
        } catch (XPathExpressionException e) {
            return false;
        }
    }

    /**
     * Evaluates the XPath expression in the specified context and returns the found element as a String.
     *
     * @param node       the XML document to evaluate
     * @param expression the compiled XPath expression
     * @return the element if it was found, or null
     */
    public static String getStringValue(Node node, XPathExpression expression) {
        try {
            return (String) expression.evaluate(node, XPathConstants.STRING);
        } catch (XPathExpressionException e) {
            return null;
        }
    }
}