# IterableDataSet.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.dataset.iterable;

    import org.qi4j.api.dataset.DataSet;
    import org.qi4j.api.dataset.Query;
    import org.qi4j.functional.Function;
    import org.qi4j.functional.Iterables;
    import org.qi4j.functional.Specification;

    /**
     * TODO
     */
    public class IterableDataSet<T>
        implements DataSet<T>
    {
        private Iterable<T> iterable;

        public IterableDataSet( Iterable<T> iterable )
        {
            this.iterable = iterable;
        }

        @Override
        public DataSet<T> constrain( Specification<T> selection )
        {
            return new IterableDataSet<T>( Iterables.filter( selection, iterable ) );
        }

        @Override
        public <U> DataSet<U> project( Function<T, U> conversion )
        {
            return new IterableDataSet<U>( Iterables.map( conversion, iterable ) );
        }

        @Override
        public Query<T> newQuery()
        {
            return new IterableQuery<T>( iterable );
        }
    }