AbstractTestCollectionModel.java

package fr.openwide.core.test.wicket.more.model;

import java.util.Collection;
import java.util.Set;

import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeMatcher;

import com.google.common.base.Equivalence;

public abstract class AbstractTestCollectionModel<C extends Collection<?>>
		extends AbstractTestModel<C> {

	protected static final Equivalence<Set<?>> UNORDERED_SET_EQUIVALENCE = new Equivalence<Set<?>>() {
			@Override
			protected boolean doEquivalent(Set<?> a, Set<?> b) {
				return a.size() == b.size() && b.containsAll(a); // No constraint on Set order
			}
	
			@Override
			protected int doHash(Set<?> t) {
				return t.hashCode();
			}
			
			@Override
			public String toString() {
				return "UNORDERED_SET_EQUIVALENCE";
			}
		};

	public AbstractTestCollectionModel(Equivalence<? super C> equivalence) {
		super(equivalence);
	}

	protected Matcher<C> isEmpty() {
		return new TypeSafeMatcher<C>() {
			@Override
			public void describeTo(Description description) {
				description.appendText("an empty collection");
			}
	
			@Override
			protected boolean matchesSafely(C item) {
				return item.isEmpty();
			}
		};
	}

}