ItEr33S14CUCreacionUnidadesPlanificacion: Creating Constraint class
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Óscar González Fernández
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/*
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* This file is part of ###PROJECT_NAME###
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*
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* Copyright (C) 2009 Fundación para o Fomento da Calidade Industrial e
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* Desenvolvemento Tecnolóxico de Galicia
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.zkoss.ganttz.data.constraint;
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import java.util.Arrays;
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import java.util.Collection;
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import org.zkoss.ganttz.util.WeakReferencedListeners;
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import org.zkoss.ganttz.util.WeakReferencedListeners.IListenerNotification;
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/**
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* @author Óscar González Fernández <ogonzalez@igalia.com>
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*
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*/
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public abstract class Constraint<T> {
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public interface IConstraintViolationListener<T> {
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public void constraintViolated(Constraint<T> constraint, T value);
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}
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public static <T> T apply(T currentValue, Constraint<T>... constraints) {
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return apply(currentValue, Arrays.asList(constraints));
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}
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public static <T> T apply(T currentValue,
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Collection<Constraint<T>> constraints) {
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T result = currentValue;
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for (Constraint<T> each : constraints) {
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result = each.applyTo(result);
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}
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for (Constraint<T> each : constraints) {
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if (!each.isSatisfiedBy(result)) {
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each.fireNotSatisfied(result);
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}
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}
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return result;
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}
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private WeakReferencedListeners<IConstraintViolationListener<T>> weakListeners = WeakReferencedListeners
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.create();
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public final T applyTo(T currentValue) {
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T result = applyConstraintTo(currentValue);
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if (!isSatisfiedBy(result)) {
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throw new IllegalStateException(result
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+ " doesn't fulfill this constraint: " + this);
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}
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return result;
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}
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protected abstract T applyConstraintTo(T currentValue);
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public abstract boolean isSatisfiedBy(T value);
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private void fireNotSatisfied(final T value) {
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weakListeners
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.fireEvent(new IListenerNotification<IConstraintViolationListener<T>>() {
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@Override
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public void doNotify(
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IConstraintViolationListener<T> listener) {
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listener.constraintViolated(Constraint.this, value);
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}
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});
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}
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public void addConstraintViolationListener(IConstraintViolationListener<T> listener) {
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weakListeners.addListener(listener);
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}
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}
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@ -0,0 +1,137 @@
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/*
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* This file is part of ###PROJECT_NAME###
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*
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* Copyright (C) 2009 Fundación para o Fomento da Calidade Industrial e
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* Desenvolvemento Tecnolóxico de Galicia
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.zkoss.ganttz.data.constraint;
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import static org.easymock.EasyMock.expect;
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import static org.easymock.EasyMock.isA;
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import static org.easymock.classextension.EasyMock.createNiceMock;
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import static org.easymock.classextension.EasyMock.replay;
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import static org.easymock.classextension.EasyMock.verify;
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import static org.hamcrest.CoreMatchers.equalTo;
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import static org.junit.Assert.assertThat;
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import java.util.ArrayList;
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import java.util.List;
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import org.junit.Test;
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import org.zkoss.ganttz.data.constraint.Constraint.IConstraintViolationListener;
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/**
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* @author Óscar González Fernández <ogonzalez@igalia.com>
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*
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*/
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public class ConstraintTest {
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private Constraint<Integer> biggerThanFive = new Constraint<Integer>() {
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@Override
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protected Integer applyConstraintTo(Integer currentValue) {
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return currentValue;
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}
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@Override
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public boolean isSatisfiedBy(Integer value) {
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return value != null && value > 5;
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}
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};
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private Constraint<Integer> lessThanFive = new Constraint<Integer>() {
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@Override
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public boolean isSatisfiedBy(Integer value) {
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return value!=null && value <5;
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}
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@Override
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protected Integer applyConstraintTo(Integer currentValue) {
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return Math.min(4, currentValue);
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}
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};
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@Test
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public void ifThereIsNoConstraintsTheOriginalValueIsReturned() {
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assertThat(Constraint.apply(2), equalTo(2));
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}
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@Test
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public void aNewValueFullfillingTheConstraintIsReturned() {
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Constraint<Integer> biggerThanFive = new Constraint<Integer>() {
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@Override
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protected Integer applyConstraintTo(Integer currentValue) {
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return Math.max(6, currentValue);
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}
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@Override
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public boolean isSatisfiedBy(Integer value) {
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return value != null && value > 5;
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}
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};
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assertThat(biggerThanFive.applyTo(5), equalTo(6));
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}
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@Test(expected = IllegalStateException.class)
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public void aConstraintMustReturnValuesThatSatisfiesItsCriterion() {
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biggerThanFive.applyTo(4);
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}
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@SuppressWarnings("unchecked")
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@Test
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public void applyingSeveralConstraintsCallsApplyToOfEveryone() {
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List<Constraint<Object>> constraints = new ArrayList<Constraint<Object>>();
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final int numerOfConstraints = 5;
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for (int i = 0; i < numerOfConstraints; i++) {
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Constraint constraint = createNiceMock(Constraint.class);
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expect(constraint.applyConstraintTo(isA(Object.class)))
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.andReturn(2).atLeastOnce();
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expect(constraint.isSatisfiedBy(isA(Object.class))).andReturn(true)
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.atLeastOnce();
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constraints.add(constraint);
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}
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replay(constraints.toArray());
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Constraint.apply(2, constraints);
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verify(constraints.toArray());
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}
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@SuppressWarnings("unchecked")
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@Test
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public void theLastConstraintHasPriority() {
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Integer result = Constraint.apply(6, biggerThanFive,
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lessThanFive);
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assertThat(result, equalTo(4));
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}
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@Test
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public void theViolatedConstraintsNotifiesItsListeners() {
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final Constraint<Integer>[] constraintViolated = new Constraint[1];
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biggerThanFive
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.addConstraintViolationListener(new IConstraintViolationListener<Integer>() {
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@Override
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public void constraintViolated(
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Constraint<Integer> constraint, Integer value) {
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constraintViolated[0] = constraint;
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}
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});
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Constraint.apply(6, biggerThanFive, lessThanFive);
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assertThat(constraintViolated[0], equalTo(biggerThanFive));
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}
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}
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