/*
* Copyright 2014 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.optaplanner.core.impl.domain.variable.inverserelation;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import org.optaplanner.core.api.domain.solution.PlanningSolution;
import org.optaplanner.core.api.domain.variable.InverseRelationShadowVariable;
import org.optaplanner.core.config.util.ConfigUtils;
import org.optaplanner.core.impl.domain.common.accessor.MemberAccessor;
import org.optaplanner.core.impl.domain.entity.descriptor.EntityDescriptor;
import org.optaplanner.core.impl.domain.policy.DescriptorPolicy;
import org.optaplanner.core.impl.domain.variable.descriptor.GenuineVariableDescriptor;
import org.optaplanner.core.impl.domain.variable.descriptor.ShadowVariableDescriptor;
import org.optaplanner.core.impl.domain.variable.descriptor.VariableDescriptor;
import org.optaplanner.core.impl.domain.variable.listener.VariableListener;
import org.optaplanner.core.impl.domain.variable.supply.Demand;
import org.optaplanner.core.impl.score.director.InnerScoreDirector;
/**
* @param <Solution_> the solution type, the class with the {@link PlanningSolution} annotation
*/
public class InverseRelationShadowVariableDescriptor<Solution_> extends ShadowVariableDescriptor<Solution_> {
protected VariableDescriptor<Solution_> sourceVariableDescriptor;
protected boolean singleton;
public InverseRelationShadowVariableDescriptor(EntityDescriptor<Solution_> entityDescriptor,
MemberAccessor variableMemberAccessor) {
super(entityDescriptor, variableMemberAccessor);
}
@Override
public void processAnnotations(DescriptorPolicy descriptorPolicy) {
processPropertyAnnotations(descriptorPolicy);
}
private void processPropertyAnnotations(DescriptorPolicy descriptorPolicy) {
// Do nothing
}
@Override
public void linkShadowSources(DescriptorPolicy descriptorPolicy) {
InverseRelationShadowVariable shadowVariableAnnotation = variableMemberAccessor
.getAnnotation(InverseRelationShadowVariable.class);
Class<?> variablePropertyType = getVariablePropertyType();
Class<?> masterClass;
if (Collection.class.isAssignableFrom(variablePropertyType)) {
Type genericType = variableMemberAccessor.getGenericType();
masterClass = ConfigUtils.extractCollectionGenericTypeParameter(
"entityClass", entityDescriptor.getEntityClass(),
variablePropertyType, genericType,
InverseRelationShadowVariable.class, variableMemberAccessor.getName());
singleton = false;
} else {
masterClass = variablePropertyType;
singleton = true;
}
EntityDescriptor<Solution_> sourceEntityDescriptor = getEntityDescriptor().getSolutionDescriptor()
.findEntityDescriptor(masterClass);
if (sourceEntityDescriptor == null) {
throw new IllegalArgumentException("The entityClass (" + entityDescriptor.getEntityClass()
+ ") has a " + InverseRelationShadowVariable.class.getSimpleName()
+ " annotated property (" + variableMemberAccessor.getName()
+ ") with a masterClass (" + masterClass
+ ") which is not a valid planning entity.");
}
String sourceVariableName = shadowVariableAnnotation.sourceVariableName();
sourceVariableDescriptor = sourceEntityDescriptor.getVariableDescriptor(sourceVariableName);
if (sourceVariableDescriptor == null) {
throw new IllegalArgumentException("The entityClass (" + entityDescriptor.getEntityClass()
+ ") has a " + InverseRelationShadowVariable.class.getSimpleName()
+ " annotated property (" + variableMemberAccessor.getName()
+ ") with sourceVariableName (" + sourceVariableName
+ ") which is not a valid planning variable on entityClass ("
+ sourceEntityDescriptor.getEntityClass() + ").\n"
+ entityDescriptor.buildInvalidVariableNameExceptionMessage(sourceVariableName));
}
boolean chained = (sourceVariableDescriptor instanceof GenuineVariableDescriptor) &&
((GenuineVariableDescriptor) sourceVariableDescriptor).isChained();
if (singleton) {
if (!chained) {
throw new IllegalArgumentException("The entityClass (" + entityDescriptor.getEntityClass()
+ ") has a " + InverseRelationShadowVariable.class.getSimpleName()
+ " annotated property (" + variableMemberAccessor.getName()
+ ") which does not return a " + Collection.class.getSimpleName()
+ " with sourceVariableName (" + sourceVariableName
+ ") which is not chained. Only a chained variable supports a singleton inverse.");
}
} else {
if (chained) {
throw new IllegalArgumentException("The entityClass (" + entityDescriptor.getEntityClass()
+ ") has a " + InverseRelationShadowVariable.class.getSimpleName()
+ " annotated property (" + variableMemberAccessor.getName()
+ ") which does returns a " + Collection.class.getSimpleName()
+ " with sourceVariableName (" + sourceVariableName
+ ") which is chained. A chained variable supports only a singleton inverse.");
}
}
sourceVariableDescriptor.registerSinkVariableDescriptor(this);
}
@Override
public List<VariableDescriptor<Solution_>> getSourceVariableDescriptorList() {
return Collections.singletonList(sourceVariableDescriptor);
}
@Override
public Class<? extends VariableListener> getVariableListenerClass() {
if (singleton) {
return SingletonInverseVariableListener.class;
} else {
return CollectionInverseVariableListener.class;
}
}
// ************************************************************************
// Worker methods
// ************************************************************************
@Override
public Demand getProvidedDemand() {
if (singleton) {
return new SingletonInverseVariableDemand(sourceVariableDescriptor);
} else {
return new CollectionInverseVariableDemand(sourceVariableDescriptor);
}
}
@Override
public VariableListener buildVariableListener(InnerScoreDirector<Solution_> scoreDirector) {
if (singleton) {
return new SingletonInverseVariableListener(this, sourceVariableDescriptor);
} else {
return new CollectionInverseVariableListener(this, sourceVariableDescriptor);
}
}
}