/* Copyright (c) 2000-2006 hamcrest.org
*/
package org.hamcrest.object;
import java.util.EventObject;
import org.hamcrest.Description;
import org.hamcrest.Factory;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeDiagnosingMatcher;
/**
* Tests if the value is an event announced by a specific object.
*/
public class IsEventFrom extends TypeSafeDiagnosingMatcher<EventObject> {
private final Class<?> eventClass;
private final Object source;
public IsEventFrom(Class<?> eventClass, Object source) {
this.eventClass = eventClass;
this.source = source;
}
@Override
public boolean matchesSafely(EventObject item, Description mismatchDescription) {
if (!eventClass.isInstance(item)) {
mismatchDescription.appendText("item type was " + item.getClass().getName());
return false;
}
if (!eventHasSameSource(item)) {
mismatchDescription.appendText("source was ").appendValue(item.getSource());
return false;
}
return true;
}
private boolean eventHasSameSource(EventObject ev) {
return ev.getSource() == source;
}
public void describeTo(Description description) {
description.appendText("an event of type ")
.appendText(eventClass.getName())
.appendText(" from ")
.appendValue(source);
}
/**
* Constructs an IsEventFrom Matcher that returns true for any object
* derived from <var>eventClass</var> announced by <var>source</var>.
*/
@Factory
public static Matcher<EventObject> eventFrom(Class<? extends EventObject> eventClass, Object source) {
return new IsEventFrom(eventClass, source);
}
/**
* Constructs an IsEventFrom Matcher that returns true for any object
* derived from {@link java.util.EventObject} announced by <var>source
* </var>.
*/
@Factory
public static Matcher<EventObject> eventFrom(Object source) {
return eventFrom(EventObject.class, source);
}
}