2 files changed, 12 insertions, 1 deletions
diff --git a/src/runtime/java/org/grammaticalframework/pgf/LiteralCallback.java b/src/runtime/java/org/grammaticalframework/pgf/LiteralCallback.java
index 87e832ae2..106b528e6 100644
--- a/src/runtime/java/org/grammaticalframework/pgf/LiteralCallback.java
+++ b/src/runtime/java/org/grammaticalframework/pgf/LiteralCallback.java
@@ -1,8 +1,12 @@
 package org.grammaticalframework.pgf;
 
+import java.util.Iterator;
+
 public interface LiteralCallback {
 	public CallbackResult match(int lin_idx, String sentence, int start_offset);
-	
+
+	public Iterator<TokenProb> predict(int lin_idx, String prefix);
+
 	public static class CallbackResult {
 		private ExprProb ep;
 		private int offset;
diff --git a/src/runtime/java/org/grammaticalframework/pgf/NercLiteralCallback.java b/src/runtime/java/org/grammaticalframework/pgf/NercLiteralCallback.java
index 72f24e712..627cbdd4f 100644
--- a/src/runtime/java/org/grammaticalframework/pgf/NercLiteralCallback.java
+++ b/src/runtime/java/org/grammaticalframework/pgf/NercLiteralCallback.java
@@ -1,5 +1,8 @@
 package org.grammaticalframework.pgf;
 
+import java.util.Collections;
+import java.util.Iterator;
+
 public class NercLiteralCallback implements LiteralCallback {
 	public CallbackResult match(int lin_idx, String sentence, int offset) {
 		StringBuilder sbuilder = new StringBuilder();
@@ -33,4 +36,8 @@ public class NercLiteralCallback implements LiteralCallback {
 
 		return null;
 	}
+	
+	public Iterator<TokenProb> predict(int lin_idx, String prefix) {
+		return Collections.<TokenProb>emptyList().iterator();
+	}
 }