| /* |
| * Copyright (c) 2007, Rickard Öberg. All Rights Reserved. |
| * |
| * 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.qi4j.runtime.association; |
| |
| import java.lang.reflect.Type; |
| import org.qi4j.api.association.Association; |
| import org.qi4j.api.association.AssociationDescriptor; |
| import org.qi4j.api.association.AssociationWrapper; |
| import org.qi4j.api.entity.EntityReference; |
| import org.qi4j.api.entity.Identity; |
| import org.qi4j.api.property.Property; |
| import org.qi4j.functional.Function2; |
| |
| /** |
| * Implementation of Association to a single Entity. |
| */ |
| public final class AssociationInstance<T> |
| extends AbstractAssociationInstance<T> |
| implements Association<T> |
| { |
| private Property<EntityReference> associationState; |
| |
| public AssociationInstance( AssociationInfo associationInfo, |
| Function2<EntityReference, Type, Object> entityFunction, |
| Property<EntityReference> associationState |
| ) |
| { |
| super( associationInfo, entityFunction ); |
| this.associationState = associationState; |
| } |
| |
| // Association implementation |
| @Override |
| public T get() |
| { |
| return getEntity( associationState.get() ); |
| } |
| |
| @Override |
| public void set( T newValue ) |
| throws IllegalArgumentException |
| { |
| checkImmutable(); |
| checkType( newValue ); |
| |
| associationInfo.checkConstraints( newValue ); |
| |
| // Change association |
| associationState.set( EntityReference.create( (Identity) newValue )); |
| } |
| |
| @Override |
| public EntityReference reference() |
| { |
| return associationState.get(); |
| } |
| |
| public Property<EntityReference> getAssociationState() |
| { |
| return associationState; |
| } |
| |
| @Override |
| public String toString() |
| { |
| if( associationState.get() == null ) |
| { |
| return ""; |
| } |
| else |
| { |
| return associationState.get().toString(); |
| } |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| int hash = associationInfo.hashCode() * 39; // Descriptor |
| if( associationState.get() != null ) |
| { |
| hash = hash * 997 + associationState.get().hashCode(); // State |
| } |
| return hash; |
| } |
| |
| @Override |
| public boolean equals( Object o ) |
| { |
| if( this == o ) |
| { |
| return true; |
| } |
| if( o == null || getClass() != o.getClass() ) |
| { |
| return false; |
| } |
| Association<?> that = (Association) o; |
| // Unwrap if needed |
| while( that instanceof AssociationWrapper ) |
| { |
| that = ( (AssociationWrapper) that ).next(); |
| } |
| // Descriptor equality |
| AssociationInstance<?> thatInstance = (AssociationInstance) that; |
| AssociationDescriptor thatDescriptor = (AssociationDescriptor) thatInstance.associationInfo(); |
| if( !associationInfo.equals( thatDescriptor ) ) |
| { |
| return false; |
| } |
| // State equality |
| if( associationState.get() != null |
| ? !associationState.get().equals( thatInstance.associationState.get() ) |
| : thatInstance.associationState.get() != null ) |
| { |
| return false; |
| } |
| return true; |
| } |
| } |