    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
    015    package org.apache.tapestry5.services;
    016
    017    import org.apache.tapestry5.NullFieldStrategy;
    018    import 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)
    024    public 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    }