001 package stringtransformers;
002
003 import cs101.io.connection.*;
004 import cs101.io.Console;
005 import java.awt.*;
006 import java.awt.event.*;
007
008 public final class TVConnectManager {
009
010 public static MouseListener getListener( final StringTransformer who )
011 {
012 // Console.println ("TVCM: Creating listener for "+ who);
013 return new MouseAdapter () {
014 public void mouseClicked( MouseEvent me )
015 {
016 // Console.println( "TVCM ST MA: mouse clicked " + who );
017
018 TVConnectManager.selectTarget ( who );
019 }
020 };
021 }
022
023 public static MouseListener getListener( final OutputAcceptor who )
024 {
025 // Console.println ("TVCM: Creating listener for an OutputAcceptor " + who);
026 return new MouseAdapter () {
027 public void mouseClicked( MouseEvent me )
028 {
029 // Console.println( "TVCM OA MA: mouse clicked " + who );
030
031 TVConnectManager.selectFromTarget ( who );
032 }
033 };
034 }
035
036 public static MouseListener getListener( final InputAcceptor who )
037 {
038 // Console.println ("TVCM: Creating listener for an InputAcceptor " + who);
039 return new MouseAdapter () {
040 public void mouseClicked( MouseEvent me )
041 {
042 // Console.println( "TVCM IA MA: mouse clicked " + who );
043
044 TVConnectManager.selectToTarget ( who );
045 }
046 };
047 }
048
049 private static OutputAcceptor fromTarget;
050 private static long fromTargetSelectTime;
051
052 private static void selectFromTarget( OutputAcceptor which )
053 {
054 TVConnectManager.fromTarget = which;
055 TVConnectManager.fromTargetSelectTime =
056 System.currentTimeMillis();
057
058 Console.println ("TVCM: selected a From target: " + which);
059 }
060
061 private static void selectTarget( StringTransformer which )
062 {
063 if ( ( TVConnectManager.fromTarget == null )
064 || ( TVConnectManager.fromTarget == which )
065 || ( TVConnectManager.fromTargetIsStale() ) )
066 {
067 TVConnectManager.selectFromTarget( which );
068 }
069 else
070 {
071 TVConnectManager.selectToTarget( which );
072 }
073 }
074
075 private static void selectToTarget( InputAcceptor which )
076 {
077 Console.println( "TVCM: selecting To target: " + which );
078
079 if ( TVConnectManager.fromTarget == null )
080 {
081 Console.println( "TVCM: From target is null; punting To selection");
082 }
083 if ( TVConnectManager.fromTarget == which )
084 {
085 Console.println( "TVCM: From (" + TVConnectManager.fromTarget +
086 ") and To (" + which +
087 ") targets are same; punting To selection");
088 }
089 if ( TVConnectManager.fromTargetIsStale() )
090 {
091 Console.println( "TVCM: From target (" + TVConnectManager.fromTarget
092 + ") is stale ("
093 + ( System.currentTimeMillis() -
094 TVConnectManager.fromTargetSelectTime )
095 + "); punting To selection");
096 }
097
098 try
099 {
100 if ( isConnectable( TVConnectManager.fromTarget, which )
101 && ( ! TVConnectManager.fromTargetIsStale() ))
102 {
103 Console.println ("TVCM: selected a To target (" +
104 which + ")....attempting connect from " +
105 TVConnectManager.fromTarget);
106
107 new StringConnector( TVConnectManager.fromTarget,
108 which );
109 Console.println ("TVCM: connected "+ TVConnectManager.fromTarget + " to " + which);
110 }
111 else
112 {
113 System.err.println ( "TV: Ignoring mouse release in " + which );
114 }
115 }
116 catch (ConnectionRejectedException e)
117 {
118 Console.println ("TVCM: rejected connection from "+ TVConnectManager.fromTarget + " to " + which);
119 }
120 TVConnectManager.fromTarget = null;
121 Console.println("");
122 }
123
124 private static final boolean isConnectable( Object from, Object to )
125 {
126 return ( ( from != null )
127 && ( to != null )
128 && ( from instanceof OutputAcceptor )
129 && ( to instanceof InputAcceptor )
130 && ( from != to ) );
131 }
132
133 private static boolean fromTargetIsStale()
134 {
135 return ( ( System.currentTimeMillis()
136 - TVConnectManager.fromTargetSelectTime )
137 >= 10000 );
138 }
139
140 private TVConnectManager(){}
141 }
142