From fa83169a59971f71b220d5d4f0d9c7fea41354a1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timo=20Westk=C3=A4mper?= <timo.westkamper@mysema.com>
Date: Sat, 4 Sep 2010 20:19:38 +0000
Subject: [PATCH]

---
 .../mysema/query/types/ExtractorVisitor.java  | 64 +++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 querydsl-core/src/main/java/com/mysema/query/types/ExtractorVisitor.java

diff --git a/querydsl-core/src/main/java/com/mysema/query/types/ExtractorVisitor.java b/querydsl-core/src/main/java/com/mysema/query/types/ExtractorVisitor.java
new file mode 100644
index 000000000..bfcfb8a5d
--- /dev/null
+++ b/querydsl-core/src/main/java/com/mysema/query/types/ExtractorVisitor.java
@@ -0,0 +1,64 @@
+package com.mysema.query.types;
+
+import com.mysema.query.types.Constant;
+import com.mysema.query.types.Custom;
+import com.mysema.query.types.Expr;
+import com.mysema.query.types.FactoryExpression;
+import com.mysema.query.types.Operation;
+import com.mysema.query.types.Param;
+import com.mysema.query.types.Path;
+import com.mysema.query.types.SubQueryExpression;
+import com.mysema.query.types.Visitor;
+
+/**
+ * @author tiwe
+ *
+ */
+public class ExtractorVisitor implements Visitor{
+
+    private Expr<?> expr;
+    
+    public ExtractorVisitor(Expr<?> e) {
+        e.accept(this);
+    }
+    
+    @Override
+    public void visit(Constant<?> expr) {
+        this.expr = expr.asExpr();
+    }
+
+    @Override
+    public void visit(Custom<?> expr) {
+        this.expr = expr.asExpr();
+    }
+
+    @Override
+    public void visit(FactoryExpression<?> expr) {
+        this.expr = expr.asExpr();
+    }
+
+    @Override
+    public void visit(Operation<?> expr) {
+        this.expr = expr.asExpr();
+    }
+
+    @Override
+    public void visit(Path<?> expr) {
+        this.expr = expr.asExpr();
+    }
+
+    @Override
+    public void visit(SubQueryExpression<?> expr) {
+        this.expr = expr.asExpr();
+    }
+
+    @Override
+    public void visit(Param<?> expr) {
+        this.expr = expr.asExpr();
+    }
+
+    public Expr<?> getExpr() {
+        return expr;
+    }
+    
+}