AbstractTestMapModel.java

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

import java.util.Map;

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

import com.google.common.base.Equivalence;
import com.google.common.base.Supplier;

public abstract class AbstractTestMapModel<M extends Map<?, ?>>
		extends AbstractTestModel<M> {

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

	protected final Supplier<? extends M> mapSupplier;

	public AbstractTestMapModel(Supplier<? extends M> mapSupplier, Equivalence<? super M> equivalence) {
		super(equivalence);
		this.mapSupplier = mapSupplier;
	}

	@SuppressWarnings({ "rawtypes", "unchecked" })
	protected M clone(M map) {
		M clone = mapSupplier.get();
		clone.putAll((Map)map);
		return clone;
	}

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

}