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package org.hamcrest.xml;
import org.hamcrest.Description;
import org.hamcrest.Factory;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeMatcher;
import org.w3c.dom.Node;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
/**
* Applies a Matcher to a given XML Node in an existing XML Node tree, specified by an XPath expression.
*
* @author Joe Walnes
*/
public class HasXPath extends TypeSafeMatcher<Node> {
private final Matcher<String> valueMatcher;
private final XPathExpression compiledXPath;
private final String xpathString;
/**
* @param xPathExpression XPath expression.
* @param valueMatcher Matcher to use at given XPath.
* May be null to specify that the XPath must exist but the value is irrelevant.
*/
public HasXPath(String xPathExpression, Matcher<String> valueMatcher) {
try {
XPath xPath = XPathFactory.newInstance().newXPath();
compiledXPath = xPath.compile(xPathExpression);
this.xpathString = xPathExpression;
this.valueMatcher = valueMatcher;
} catch (XPathExpressionException e) {
throw new IllegalArgumentException("Invalid XPath : " + xPathExpression, e);
}
}
public boolean matchesSafely(Node item) {
try {
String result = (String) compiledXPath.evaluate(item, XPathConstants.STRING);
if (result == null) {
return false;
} else if (valueMatcher == null) {
return !result.equals("");
} else {
return valueMatcher.matches(result);
}
} catch (XPathExpressionException e) {
return false;
}
}
public void describeTo(Description description) {
description.appendText("an XML document with XPath ").appendText(xpathString);
if (valueMatcher != null) {
description.appendText(" ").appendDescriptionOf(valueMatcher);
}
}
@Factory
public static Matcher<Node> hasXPath(String xPath, Matcher<String> valueMatcher) {
return new HasXPath(xPath, valueMatcher);
}
@Factory
public static Matcher<Node> hasXPath(String xPath) {
return hasXPath(xPath, null);
}
}
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