# ContainsSpecification.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.api.query.grammar;

    import java.util.Collection;
    import org.qi4j.api.composite.Composite;

    /**
     * Contains Specification.
     */
    public class ContainsSpecification<T>
        extends ExpressionSpecification
    {
        private PropertyFunction<? extends Collection<T>> collectionProperty;
        private T value;

        public ContainsSpecification( PropertyFunction<? extends Collection<T>> collectionProperty, T value )
        {
            this.collectionProperty = collectionProperty;
            this.value = value;
        }

        public PropertyFunction<? extends Collection<T>> collectionProperty()
        {
            return collectionProperty;
        }

        public T value()
        {
            return value;
        }

        @Override
        public boolean satisfiedBy( Composite item )
        {
            Collection<T> collection = collectionProperty.map( item ).get();

            if( collection == null )
            {
                return false;
            }

            return collection.contains( value );
        }

        @Override
        public String toString()
        {
            return collectionProperty + " contains " + value;
        }
    }