# Fields.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.util;

    import java.lang.reflect.Field;
    import java.lang.reflect.Type;
    import org.qi4j.functional.Function;
    import org.qi4j.functional.Function2;
    import org.qi4j.functional.Iterables;

    import static org.qi4j.functional.Iterables.iterable;

    /**
     * Useful methods for handling Fields.
     */
    public final class Fields
    {
        public static final Function2<Class<?>, String, Field> FIELD_NAMED = new Function2<Class<?>, String, Field>()
        {
            @Override
            public Field map( Class<?> aClass, String name )
            {
                return Iterables.first( Iterables.filter( Classes.memberNamed( name ), FIELDS_OF.map( aClass ) ) );
            }
        };

        public static final Function<Type, Iterable<Field>> FIELDS_OF = Classes.forClassHierarchy( new Function<Class<?>, Iterable<Field>>()
        {
            @Override
            public Iterable<Field> map( Class<?> type )
            {
                return iterable( type.getDeclaredFields() );
            }
        } );
    }