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package org.hamcrest.core;
import org.hamcrest.Description;
import org.hamcrest.DiagnosingMatcher;
import org.hamcrest.Matcher;
/**
* Tests whether the value is an instance of a class.
* Classes of basic types will be converted to the relevant "Object" classes
*/
public class IsInstanceOf extends DiagnosingMatcher<Object> {
private final Class<?> expectedClass;
private final Class<?> matchableClass;
/**
* Creates a new instance of IsInstanceOf
*
* @param expectedClass The predicate evaluates to true for instances of this class
* or one of its subclasses.
*/
public IsInstanceOf(Class<?> expectedClass) {
this.expectedClass = expectedClass;
this.matchableClass = matchableClass(expectedClass);
}
private static Class<?> matchableClass(Class<?> expectedClass) {
if (boolean.class.equals(expectedClass)) return Boolean.class;
if (byte.class.equals(expectedClass)) return Byte.class;
if (char.class.equals(expectedClass)) return Character.class;
if (double.class.equals(expectedClass)) return Double.class;
if (float.class.equals(expectedClass)) return Float.class;
if (int.class.equals(expectedClass)) return Integer.class;
if (long.class.equals(expectedClass)) return Long.class;
if (short.class.equals(expectedClass)) return Short.class;
return expectedClass;
}
@Override
protected boolean matches(Object item, Description mismatch) {
if (null == item) {
mismatch.appendText("null");
return false;
}
if (!matchableClass.isInstance(item)) {
mismatch.appendValue(item).appendText(" is a " + item.getClass().getName());
return false;
}
return true;
}
@Override
public void describeTo(Description description) {
description.appendText("an instance of ").appendText(expectedClass.getName());
}
/**
* Creates a matcher that matches when the examined object is an instance of the specified <code>type</code>,
* as determined by calling the {@link java.lang.Class#isInstance(Object)} method on that type, passing the
* the examined object.
*
* <p>The created matcher assumes no relationship between specified type and the examined object.</p>
* For example:
* <pre>assertThat(new Canoe(), instanceOf(Paddlable.class));</pre>
*
*/
@SuppressWarnings("unchecked")
public static <T> Matcher<T> instanceOf(Class<?> type) {
return (Matcher<T>) new IsInstanceOf(type);
}
/**
* Creates a matcher that matches when the examined object is an instance of the specified <code>type</code>,
* as determined by calling the {@link java.lang.Class#isInstance(Object)} method on that type, passing the
* the examined object.
*
* <p>The created matcher forces a relationship between specified type and the examined object, and should be
* used when it is necessary to make generics conform, for example in the JMock clause
* <code>with(any(Thing.class))</code></p>
* For example:
* <pre>assertThat(new Canoe(), instanceOf(Canoe.class));</pre>
*
*/
@SuppressWarnings("unchecked")
public static <T> Matcher<T> any(Class<T> type) {
return (Matcher<T>) new IsInstanceOf(type);
}
}
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