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package org.junit.internal.matchers;
import java.lang.reflect.Method;
import org.hamcrest.BaseMatcher;
import org.junit.internal.MethodSorter;
/**
* Convenient base class for Matchers that require a non-null value of a specific type.
* This simply implements the null check, checks the type and then casts.
*
* @author Joe Walnes
* @deprecated Please use {@link org.hamcrest.TypeSafeMatcher}.
*/
@Deprecated
public abstract class TypeSafeMatcher<T> extends BaseMatcher<T> {
private Class<?> expectedType;
/**
* Subclasses should implement this. The item will already have been checked for
* the specific type and will never be null.
*/
public abstract boolean matchesSafely(T item);
protected TypeSafeMatcher() {
expectedType = findExpectedType(getClass());
}
private static Class<?> findExpectedType(Class<?> fromClass) {
for (Class<?> c = fromClass; c != Object.class; c = c.getSuperclass()) {
for (Method method : MethodSorter.getDeclaredMethods(c)) {
if (isMatchesSafelyMethod(method)) {
return method.getParameterTypes()[0];
}
}
}
throw new Error("Cannot determine correct type for matchesSafely() method.");
}
private static boolean isMatchesSafelyMethod(Method method) {
return method.getName().equals("matchesSafely")
&& method.getParameterTypes().length == 1
&& !method.isSynthetic();
}
protected TypeSafeMatcher(Class<T> expectedType) {
this.expectedType = expectedType;
}
/**
* Method made final to prevent accidental override.
* If you need to override this, there's no point on extending TypeSafeMatcher.
* Instead, extend the {@link BaseMatcher}.
*/
@SuppressWarnings({"unchecked"})
public final boolean matches(Object item) {
return item != null
&& expectedType.isInstance(item)
&& matchesSafely((T) item);
}
}
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