001 /*
002 * Copyright 2005 Stephen J. McConnell.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
013 * implied.
014 *
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019 package net.dpml.test;
020
021 import java.awt.Color;
022
023 import net.dpml.logging.Logger;
024
025 /**
026 * Component used to validate the singleton lisfestyle policy.
027 *
028 * @author <a href="http://www.dpml.net">Digital Product Meta Library</a>
029 * @version 1.2.0
030 */
031 public class SingletonComponent implements ColorManager
032 {
033 //------------------------------------------------------------------
034 // concerns
035 //------------------------------------------------------------------
036
037 /**
038 * The componet defined construction criteria.
039 */
040 public interface Context
041 {
042 /**
043 * Return the assigned color.
044 * @return the color value
045 */
046 Color getColor();
047 }
048
049 //------------------------------------------------------------------
050 // state
051 //------------------------------------------------------------------
052
053 /**
054 * The logging channel.
055 */
056 private final Logger m_logger;
057
058 /**
059 * The assigned context instance.
060 */
061 private final Context m_context;
062
063 //------------------------------------------------------------------
064 // constructor
065 //------------------------------------------------------------------
066
067 /**
068 * Creation of a new singleton component instance.
069 * @param logger the assinged logging channel
070 * @param context a context implementation fullfil,ling the context criteria
071 */
072 public SingletonComponent( final Logger logger, final Context context )
073 {
074 m_context = context;
075 m_logger = logger;
076
077 getLogger().debug( "example component created" );
078 }
079
080 //------------------------------------------------------------------
081 // Example
082 //------------------------------------------------------------------
083
084 /**
085 * Return the color value assigned to the component context.
086 * @return the color value
087 */
088 public Color getColor()
089 {
090 return m_context.getColor();
091 }
092
093 //------------------------------------------------------------------
094 // internal
095 //------------------------------------------------------------------
096
097 /**
098 * Return the assigned logging channel.
099 * @return the logging channel
100 */
101 private Logger getLogger()
102 {
103 return m_logger;
104 }
105 }