001// Copyright 2008 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry5.services;
016
017import org.apache.tapestry5.NullFieldStrategy;
018import org.apache.tapestry5.ioc.annotations.UsesMappedConfiguration;
019
020/**
021 * A source for {@link org.apache.tapestry5.NullFieldStrategy} instances based on a logical name.
022 */
023@UsesMappedConfiguration(NullFieldStrategy.class)
024public interface NullFieldStrategySource
025{
026    /**
027     * Returns the instance based on the name.  Instances are expected to be stateless and therefore, shareable and
028     * thread safe.
029     *
030     * @param name name of the strategy (case is ignored)
031     * @return the strategy
032     * @throws IllegalArgumentException if the name does not match a configured instance
033     */
034    NullFieldStrategy get(String name);
035}