tagger benchmark

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

diff --git a/Robust/src/Benchmarks/mlp/tagger/mlp-java/Engine.java b/Robust/src/Benchmarks/mlp/tagger/mlp-java/Engine.java
new file mode 100644 (file)
index 0000000..5c3d52c
--- /dev/null
+++ b/Robust/src/Benchmarks/mlp/tagger/mlp-java/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
+}\r