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package org.junit.internal.matchers;
import java.io.PrintWriter;
import java.io.StringWriter;
import org.hamcrest.Description;
import org.hamcrest.Factory;
import org.hamcrest.Matcher;
/**
* A matcher that delegates to throwableMatcher and in addition appends the
* stacktrace of the actual Throwable in case of a mismatch.
*/
public class StacktracePrintingMatcher<T extends Throwable> extends
org.hamcrest.TypeSafeMatcher<T> {
private final Matcher<T> throwableMatcher;
public StacktracePrintingMatcher(Matcher<T> throwableMatcher) {
this.throwableMatcher = throwableMatcher;
}
public void describeTo(Description description) {
throwableMatcher.describeTo(description);
}
@Override
protected boolean matchesSafely(T item) {
return throwableMatcher.matches(item);
}
@Override
protected void describeMismatchSafely(T item, Description description) {
throwableMatcher.describeMismatch(item, description);
description.appendText("\nStacktrace was: ");
description.appendText(readStacktrace(item));
}
private String readStacktrace(Throwable throwable) {
StringWriter stringWriter = new StringWriter();
throwable.printStackTrace(new PrintWriter(stringWriter));
return stringWriter.toString();
}
@Factory
public static <T extends Throwable> Matcher<T> isThrowable(
Matcher<T> throwableMatcher) {
return new StacktracePrintingMatcher<T>(throwableMatcher);
}
@Factory
public static <T extends Exception> Matcher<T> isException(
Matcher<T> exceptionMatcher) {
return new StacktracePrintingMatcher<T>(exceptionMatcher);
}
}
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