tagger benchmark

[IRC.git] / Robust / src / Benchmarks / mlp / tagger / original-java / src / tagger / Engine.java

diff --git a/Robust/src/Benchmarks/mlp/tagger/original-java/src/tagger/Engine.java b/Robust/src/Benchmarks/mlp/tagger/original-java/src/tagger/Engine.java
new file mode 100755 (executable)
index 0000000..72a8e47
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+++ b/Robust/src/Benchmarks/mlp/tagger/original-java/src/tagger/Engine.java
@@ -0,0 +1,78 @@
+/**\r
+ * Engine class\r
+ * Maps token types to actions\r
+ *\r
+ * @author  Daniel Jackson\r
+ * @version 0, 07/06/01\r
+ */\r
+\r
+package tagger;\r
+import java.util.*;\r
+\r
+public class Engine {\r
+       /**\r
+       * There are some very tricky concurrent modification issues with this class.\r
+       * Can't execute a register or unregister method during an execution of consume_token\r
+       * if the register or unregister affects the same list of actions associated with the token.\r
+       * This means that during a consume_token for some type, can't register or unregister for\r
+       * that type, or for the all types.\r
+       * Note that a version of the perform method of action takes an iterator argument to\r
+       * allow an action to remove itself.\r
+       */\r
+\r
+       // array of Action lists indexed on token type\r
+       private LinkedList [] actions;\r
+\r
+       // actions performed for all token types\r
+       private LinkedList default_actions;\r
+\r
+       public Engine () {\r
+               actions = new LinkedList [Token.MAXTOKEN + 1];\r
+               for (int i = 0; i < actions.length; i++)\r
+                       actions[i] = new LinkedList ();\r
+               default_actions = new LinkedList ();\r
+       }\r
+\r
+       public void register_by_type (Action action, int type) {\r
+               register_by_type_front (action, type);\r
+               }\r
+\r
+       public void register_for_all (Action action) {\r
+               default_actions.addFirst (action);\r
+               }\r
+\r
+       public void unregister_for_all (Action action) {\r
+               default_actions.remove (action);\r
+               }\r
+\r
+       public void register_by_type_front (Action action, int type) {\r
+               Assert.assert (type >= 0);\r
+               Assert.assert (type <= Token.MAXTOKEN);\r
+               actions[type].addFirst (action);\r
+               }\r
+\r
+       public void register_by_type_back (Action action, int type) {\r
+               Assert.assert (type >= 0);\r
+               Assert.assert (type <= Token.MAXTOKEN);\r
+               actions[type].addLast (action);\r
+               }\r
+\r
+       public void unregister_by_type (Action action, int type) {\r
+               Assert.assert (type >= 0);\r
+               Assert.assert (type <= Token.MAXTOKEN);\r
+               actions[type].remove (action);\r
+               }\r
+\r
+       public void consume_token (Token token) {\r
+               perform_actions (default_actions, token);\r
+               perform_actions (actions[token.type], token);\r
+               }\r
+\r
+       public static void perform_actions (LinkedList actions, Token token) {\r
+               Iterator i = actions.iterator ();\r
+               while (i.hasNext ()) {\r
+                       Action a = (Action) i.next ();\r
+                       a.perform (token, i);\r
+                       }\r
+               }\r
+}
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