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package org.custommonkey.xmlunit.examples;

import java.io.IOException;
import java.io.Reader;

import org.custommonkey.xmlunit.XpathEngine;
import org.custommonkey.xmlunit.XMLUnit;
import org.custommonkey.xmlunit.exceptions.XpathException;

import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import junit.framework.Assert;

/**
 * Example demonstrating how to use the XPath API of XMLUnit in
 * conjunction with regular expressions (as provided by the
 * java.util.regex package of JDK 1.4+).
 */

public class XPathRegexAssert {
    private static final String EXPECTED_VALUE_TO_MATCH = "expected value to match ";

    // no instances
    private XPathRegexAssert() {}

    public static void assertXPathMatches(String message, String regex,
                                          String xpath, Document doc)
        throws XpathException {
        XpathEngine engine = XMLUnit.newXpathEngine();
        String value = engine.evaluate(xpath, doc);
        Assert.assertTrue(message, value.matches(regex));
    }

    public static void assertXPathMatches(String message, String regex,
                                          String xpath, String xml)
        throws XpathException, SAXException, IOException {
        Document doc = XMLUnit.buildControlDocument(xml);
        assertXPathMatches(message, regex, xpath, doc);
    }

    public static void assertXPathMatches(String message, String regex,
                                          String xpath, Reader reader)
        throws XpathException, SAXException, IOException {
        Document doc = XMLUnit.buildControlDocument(new InputSource(reader));
        assertXPathMatches(message, regex, xpath, doc);
    }

    public static void assertXPathMatches(String regex,
                                          String xpath, Document doc)
        throws XpathException {
        assertXPathMatches(EXPECTED_VALUE_TO_MATCH + regex, regex,
                           xpath, doc);
    }

    public static void assertXPathMatches(String regex,
                                          String xpath, String xml)
        throws XpathException, SAXException, IOException {
        assertXPathMatches(EXPECTED_VALUE_TO_MATCH + regex, regex,
                           xpath, xml);
    }

    public static void assertXPathMatches(String regex,
                                          String xpath, Reader reader)
        throws XpathException, SAXException, IOException {
        assertXPathMatches(EXPECTED_VALUE_TO_MATCH + regex, regex,
                           xpath, reader);
    }
}