Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright 2010-2013, CloudBees Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License 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 org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import javax.annotation.Nonnull;

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

public class Main {
    private final static XPath xpath = XPathFactory.newInstance().newXPath();

    /**
     * Returns the unique XML element matching the given {@code xpathExpression}
     *
     * @param document
     * @param xpathExpression xpath expression to find the element
     * @return the matching element
     * @throws RuntimeException 0 or more than 1 matching element found
     */
    @Nonnull
    public static Element getUniqueElement(@Nonnull Document document, @Nonnull String xpathExpression)
            throws RuntimeException {
        return getUniqueElement((Node) document, xpathExpression);

    }

    /**
     * Returns the unique XML element matching the given {@code xpathExpression}
     *
     * @param element
     * @param xpathExpression xpath expression to find the element
     * @return the matching element
     * @throws RuntimeException 0 or more than 1 matching element found
     */
    @Nonnull
    public static Element getUniqueElement(@Nonnull Element element, @Nonnull String xpathExpression) {
        return getUniqueElement((Node) element, xpathExpression);
    }

    /**
     * Returns the unique XML element matching the given {@code xpathExpression}
     *
     * @param node
     * @param xpathExpression xpath expression to find the node
     * @return the matching node
     * @throws RuntimeException 0 or more than 1 matching element found
     */
    @Nonnull
    public static Element getUniqueElement(@Nonnull Node node, @Nonnull String xpathExpression) {
        try {
            NodeList nl = (NodeList) xpath.compile(xpathExpression).evaluate(node, XPathConstants.NODESET);
            if (nl.getLength() == 0 || nl.getLength() > 1) {
                throw new RuntimeException("More or less (" + nl.getLength()
                        + ") than 1 node found for expression: " + xpathExpression);
            }
            return (Element) nl.item(0);
        } catch (Exception e) {
            throw new RuntimeException("Exception evaluating xpath '" + xpathExpression + "' on " + node, e);
        }
    }
}