mirror of https://github.com/apache/ant-ivy
79 lines
3.5 KiB
Java
79 lines
3.5 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package org.apache.ivy.util;
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import java.io.File;
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import javax.xml.namespace.QName;
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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.parsers.DocumentBuilderFactory;
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import javax.xml.xpath.XPathExpression;
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import javax.xml.xpath.XPathFactory;
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import org.w3c.dom.Document;
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/**
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* An utility class to help with XML file parsing and XML content handling
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*/
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public class TestXmlHelper {
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/**
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* Evaluates the passed {@link XPathExpression} against the {@link Document} created out of the
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* passed <code>xmlFile</code> and returns the result of the evaluation.
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*
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* @param xmlFile The XML file to parse
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* @param xPathExpression The XPath expression to evaluate
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* @param returnType The expected return type of the {@link XPathExpression#evaluate(Object, QName) evaluation}
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* @return The result
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* @throws Exception if something goes wrong
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*/
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public static Object evaluateXPathExpr(final File xmlFile, final XPathExpression xPathExpression, final QName returnType)
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throws Exception {
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if (xmlFile == null) {
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throw new IllegalArgumentException("XML file cannot be null");
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}
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if (!xmlFile.isFile()) {
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throw new IllegalArgumentException(xmlFile + " is either missing or not a file");
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}
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if (xPathExpression == null) {
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throw new IllegalArgumentException("XPath expression cannot be null");
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}
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final DocumentBuilder documentBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
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final Document document = documentBuilder.parse(xmlFile);
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return xPathExpression.evaluate(document, returnType);
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}
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/**
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* Evaluates the passed <code>xpathExpression</code> against the {@link Document} created out of
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* the passed <code>xmlFile</code> and returns the result of the evaluation. This is the same as
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* calling {@link #evaluateXPathExpr(File, XPathExpression, QName)}, with
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* <code>XPathFactory.newInstance().newXPath().compile(xpathExpression)</code> as the
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* {@link XPathExpression} parameter
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*
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* @param xmlFile The XML file to parse
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* @param xpathExpression The XPath expression to evaluate
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* @param returnType The expected return type of the {@link XPathExpression#evaluate(Object, QName) evaluation}
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* @return The result
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* @throws Exception if something goes wrong
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*/
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public static Object evaluateXPathExpr(final File xmlFile, final String xpathExpression, final QName returnType) throws Exception {
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return evaluateXPathExpr(xmlFile, XPathFactory.newInstance().newXPath().compile(xpathExpression), returnType);
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}
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}
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