From a90756aeda2a4c5ad33a8ca01e5b9ca5cd15f85f Mon Sep 17 00:00:00 2001
From: "kr.angelov" <kr.angelov@gmail.com>
Date: Tue, 8 Apr 2014 13:54:49 +0000
Subject: [PATCH] added preliminary API for custom literals from Java. Not
 functional yet

---
 .../java/org/grammaticalframework/pgf/Concr.java |  2 ++
 .../grammaticalframework/pgf/ExprBuilder.java    | 16 ++++++++++++++++
 .../pgf/LiteralCallback.java                     |  5 +++++
 .../pgf/NercLiteralCallback.java                 |  7 +++++++
 4 files changed, 30 insertions(+)
 create mode 100644 src/runtime/java/org/grammaticalframework/pgf/ExprBuilder.java
 create mode 100644 src/runtime/java/org/grammaticalframework/pgf/LiteralCallback.java
 create mode 100644 src/runtime/java/org/grammaticalframework/pgf/NercLiteralCallback.java

diff --git a/src/runtime/java/org/grammaticalframework/pgf/Concr.java b/src/runtime/java/org/grammaticalframework/pgf/Concr.java
index f7a026681..9bc73ea5a 100644
--- a/src/runtime/java/org/grammaticalframework/pgf/Concr.java
+++ b/src/runtime/java/org/grammaticalframework/pgf/Concr.java
@@ -38,6 +38,8 @@ public class Concr {
 
 	public native void unload();
 
+	public native void addLiteral(String cat, LiteralCallback callback);
+
 	//////////////////////////////////////////////////////////////////
 	// private stuff
 	
diff --git a/src/runtime/java/org/grammaticalframework/pgf/ExprBuilder.java b/src/runtime/java/org/grammaticalframework/pgf/ExprBuilder.java
new file mode 100644
index 000000000..a34a6c19d
--- /dev/null
+++ b/src/runtime/java/org/grammaticalframework/pgf/ExprBuilder.java
@@ -0,0 +1,16 @@
+package org.grammaticalframework.pgf;
+
+public class ExprBuilder {
+	public ExprBuilder() {
+		
+	}
+
+	ExprBuilder(long poolRef) {
+	}
+
+	public native Expr mkApp(String fun, Expr... args);
+
+	public native Expr mkLiteral(String s);
+	public native Expr mkLiteral(int n);
+	public native Expr mkLiteral(double d);
+}
diff --git a/src/runtime/java/org/grammaticalframework/pgf/LiteralCallback.java b/src/runtime/java/org/grammaticalframework/pgf/LiteralCallback.java
new file mode 100644
index 000000000..4292a4116
--- /dev/null
+++ b/src/runtime/java/org/grammaticalframework/pgf/LiteralCallback.java
@@ -0,0 +1,5 @@
+package org.grammaticalframework.pgf;
+
+public interface LiteralCallback {
+	public int match(Concr concr, int lin_idx, ExprBuilder builder, String sentence, int start_offset);
+}
diff --git a/src/runtime/java/org/grammaticalframework/pgf/NercLiteralCallback.java b/src/runtime/java/org/grammaticalframework/pgf/NercLiteralCallback.java
new file mode 100644
index 000000000..ad1036c56
--- /dev/null
+++ b/src/runtime/java/org/grammaticalframework/pgf/NercLiteralCallback.java
@@ -0,0 +1,7 @@
+package org.grammaticalframework.pgf;
+
+public class NercLiteralCallback implements LiteralCallback {
+	public int match(Concr concr, int lin_idx, ExprBuilder builder, String sentence, int start_offset) {
+		return start_offset;
+	}
+}