# ManyAssociationsModel.java

    /*
     * Copyright (c) 2008-2011, 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.AccessibleObject;
    import java.lang.reflect.Member;
    import java.util.LinkedHashMap;
    import java.util.Map;
    import org.qi4j.api.association.AssociationDescriptor;
    import org.qi4j.api.association.ManyAssociation;
    import org.qi4j.api.common.QualifiedName;
    import org.qi4j.functional.HierarchicalVisitor;
    import org.qi4j.functional.VisitableHierarchy;
    import org.qi4j.runtime.structure.ModuleUnitOfWork;
    import org.qi4j.runtime.value.ValueStateInstance;
    import org.qi4j.spi.entity.EntityState;

    /**
     * Model for ManyAssociations.
     */
    public final class ManyAssociationsModel
        implements VisitableHierarchy<ManyAssociationsModel, ManyAssociationModel>
    {
        private final Map<AccessibleObject, ManyAssociationModel> mapAccessorAssociationModel = new LinkedHashMap<>();

        public ManyAssociationsModel()
        {
        }

        public Iterable<ManyAssociationModel> manyAssociations()
        {
            return mapAccessorAssociationModel.values();
        }

        public void addManyAssociation( ManyAssociationModel model )
        {
            mapAccessorAssociationModel.put( model.accessor(), model );
        }

        @Override
        public <ThrowableType extends Throwable> boolean accept( HierarchicalVisitor<? super ManyAssociationsModel, ? super ManyAssociationModel, ThrowableType> visitor )
            throws ThrowableType
        {
            if( visitor.visitEnter( this ) )
            {
                for( ManyAssociationModel associationModel : mapAccessorAssociationModel.values() )
                {
                    if( !associationModel.accept( visitor ) )
                    {
                        break;
                    }
                }
            }
            return visitor.visitLeave( this );
        }

        public <T> ManyAssociation<T> newInstance( AccessibleObject accessor,
                                                   EntityState entityState,
                                                   ModuleUnitOfWork uow )
        {
            return mapAccessorAssociationModel.get( accessor ).newInstance( uow, entityState );
        }

        public ManyAssociationModel getManyAssociation( AccessibleObject accessor )
            throws IllegalArgumentException
        {
            ManyAssociationModel manyAssociationModel = mapAccessorAssociationModel.get( accessor );
            if( manyAssociationModel == null )
            {
                throw new IllegalArgumentException( "No many-association found with name:" + ( (Member) accessor ).getName() );
            }
            return manyAssociationModel;
        }

        public AssociationDescriptor getManyAssociationByName( String name )
            throws IllegalArgumentException
        {
            for( ManyAssociationModel associationModel : mapAccessorAssociationModel.values() )
            {
                if( associationModel.qualifiedName().name().equals( name ) )
                {
                    return associationModel;
                }
            }
            throw new IllegalArgumentException( "No many-association found with name:" + name );
        }

        public AssociationDescriptor getManyAssociationByQualifiedName( QualifiedName name )
            throws IllegalArgumentException
        {
            for( ManyAssociationModel associationModel : mapAccessorAssociationModel.values() )
            {
                if( associationModel.qualifiedName().equals( name ) )
                {
                    return associationModel;
                }
            }
            throw new IllegalArgumentException( "No many-association found with qualified name:" + name );
        }

        public void checkConstraints( ValueStateInstance state )
        {
            for( ManyAssociationModel manyAssociationModel : mapAccessorAssociationModel.values() )
            {
                manyAssociationModel.checkAssociationConstraints( state.manyAssociationFor( manyAssociationModel.accessor() ) );
            }
        }
    }