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    }