| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.zest.runtime.association; |
| |
| import java.lang.reflect.Type; |
| import org.apache.zest.api.association.AbstractAssociation; |
| import org.apache.zest.api.entity.EntityReference; |
| import org.apache.zest.api.entity.Identity; |
| import org.apache.zest.functional.Function2; |
| |
| /** |
| * Implementation of AbstractAssociation. Includes helper methods for subclasses |
| */ |
| public abstract class AbstractAssociationInstance<T> |
| implements AbstractAssociation |
| { |
| protected AssociationInfo associationInfo; |
| private final Function2<EntityReference, Type, Object> entityFunction; |
| |
| public AbstractAssociationInstance( AssociationInfo associationInfo, |
| Function2<EntityReference, Type, Object> entityFunction |
| ) |
| { |
| this.associationInfo = associationInfo; |
| this.entityFunction = entityFunction; |
| } |
| |
| public AssociationInfo associationInfo() |
| { |
| return associationInfo; |
| } |
| |
| public void setAssociationInfo( AssociationInfo newInfo ) |
| { |
| this.associationInfo = newInfo; |
| } |
| |
| @SuppressWarnings( "unchecked" ) |
| protected T getEntity( EntityReference entityId ) |
| { |
| if( entityId == null ) |
| { |
| return null; |
| } |
| |
| return (T) entityFunction.map( entityId, associationInfo.type() ); |
| } |
| |
| protected EntityReference getEntityReference( Object composite ) |
| { |
| if( composite == null ) |
| { |
| return null; |
| } |
| |
| return new EntityReference( ( (Identity) composite ).identity().get() ); |
| } |
| |
| protected void checkType( Object instance ) |
| { |
| |
| if( instance instanceof Identity || instance == null ) |
| { |
| return; |
| } |
| throw new IllegalArgumentException( "Object must be a subtype of org.qi4j.api.identity.Identity: " + instance.getClass() ); |
| } |
| |
| protected void checkImmutable() |
| throws IllegalStateException |
| { |
| if( associationInfo.isImmutable() ) |
| { |
| throw new IllegalStateException( "Association [" + associationInfo.qualifiedName() + "] is immutable." ); |
| } |
| } |
| } |