core/api/src/main/java/org/qi4j/api/query/grammar/ManyAssociationContainsSpecification.java

/*
 * Copyright 2007-2011 Rickard Öberg.
 * Copyright 2007-2010 Niclas Hedhman.
 *
 * 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
 * ied.
 *
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.qi4j.api.query.grammar;

import org.qi4j.api.association.ManyAssociation;
import org.qi4j.api.composite.Composite;

/**
 * ManyAssociation Contains Specification.
 */
public class ManyAssociationContainsSpecification<T>
    extends ExpressionSpecification
{
    private final ManyAssociationFunction<T> manyAssociationFunction;
    private final T value;

    public ManyAssociationContainsSpecification( ManyAssociationFunction<T> manyAssociationFunction, T value )
    {
        this.manyAssociationFunction = manyAssociationFunction;
        this.value = value;
    }

    public ManyAssociationFunction<T> manyAssociation()
    {
        return manyAssociationFunction;
    }

    public T value()
    {
        return value;
    }

    @Override
    public boolean satisfiedBy( Composite item )
    {
        ManyAssociation<T> collection = manyAssociationFunction.map( item );
        if( collection == null )
        {
            return false;
        }
        return collection.contains( value );
    }

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