// Copyright 2006, 2007, 2008 The Apache Software Foundation

 //

 // Licensed 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.apache.tapestry5.services;

 import org.apache.tapestry5.ioc.annotations.UsesConfiguration;

 import java.util.Map;

 /**

  * A thin wrapper around a set of {@link org.apache.tapestry5.services.AliasContribution}s. An {@link

  * org.apache.tapestry5.ioc.ObjectProvider} is contributed to the {@link org.apache.tapestry5.ioc.services.MasterObjectProvider}

  * service, to allow contributed objects to replace other objects (typically, built in services).

  */

 @UsesConfiguration(AliasContribution.class)

 public interface AliasManager

 {

     /**

      * Filters down the contributions based on the mode. Each {@link AliasContribution contribution} will identify a

      * contribution type and a non-null object that implements the type and may identify a mode. Only contributions

      * where the mode is blank or the mode matches the provided mode are returned. Mode specific contributions quietly

      * override non-specific contributions (where the mode is blank).

      *

      * @param mode

      * @return map from contribution type to contribution object

      */

     Map<Class, Object> getAliasesForMode(String mode);

 }