# ManyAssociationValueState.java

    /*
     * 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.qi4j.runtime.value;

    import java.util.Iterator;
    import java.util.List;
    import org.qi4j.api.entity.EntityReference;
    import org.qi4j.spi.entity.ManyAssociationState;

    /**
     * ManyAssociationState implementation for Value composites.
     */
    public class ManyAssociationValueState
        implements ManyAssociationState
    {
        private List<EntityReference> references;

        public ManyAssociationValueState( List<EntityReference> references )
        {
            this.references = references;
        }

        @Override
        public int count()
        {
            return references.size();
        }

        @Override
        public boolean contains( EntityReference entityReference )
        {
            return references.contains( entityReference );
        }

        @Override
        public boolean add( int i, EntityReference entityReference )
        {
            if( references.contains( entityReference ) )
            {
                return false;
            }

            references.add( i, entityReference );
            return true;
        }

        @Override
        public boolean remove( EntityReference entity )
        {
            boolean removed = references.remove( entity );
            return removed;
        }

        @Override
        public EntityReference get( int i )
        {
            return references.get( i );
        }

        @Override
        public Iterator<EntityReference> iterator()
        {
            final Iterator<EntityReference> iter = references.iterator();

            return new Iterator<EntityReference>()
            {
                EntityReference current;

                @Override
                public boolean hasNext()
                {
                    return iter.hasNext();
                }

                @Override
                public EntityReference next()
                {
                    current = iter.next();
                    return current;
                }

                @Override
                public void remove()
                {
                    iter.remove();
                }
            };
        }
    }