introduced Projectable interface

querydsl-core/src/main/java/com/mysema/query/Projectable.java

@@ -0,0 +1,46 @@
+package com.mysema.query;
+
+import java.util.Iterator;
+import java.util.List;
+
+import com.mysema.query.grammar.types.Expr;
+
+/**
+ * Projectable provides
+ *
+ * @author tiwe
+ * @version $Id$
+ */
+public interface Projectable {
+    /**
+     * return the amount of matched rows
+     */
+    long count();
+
+    /**
+     * iterate over the results with the given projection
+     */
+    Iterator<Object[]> iterate(Expr<?> e1, Expr<?> e2, Expr<?>... rest);
+
+    /**
+     * iterate over the results with the given projection
+     */
+    <RT> Iterator<RT> iterate(Expr<RT> projection);
+
+    /**
+     * list the results with the given projection
+     */
+    List<Object[]> list(Expr<?> e1, Expr<?> e2, Expr<?>... rest);
+
+    /**
+     * list the results with the given projection
+     */
+    <RT> List<RT> list(Expr<RT> projection);
+
+    /**
+     * return a unique result for the given projection or null for an empty result
+     */
+    <RT> RT uniqueResult(Expr<RT> expr);
+
+
+}

querydsl-core/src/main/java/com/mysema/query/ProjectableAdapter.java

@@ -0,0 +1,46 @@
+package com.mysema.query;
+
+import java.util.Iterator;
+import java.util.List;
+
+import com.mysema.query.grammar.types.Expr;
+
+/**
+ * ProjectableAdapter provides
+ *
+ * @author tiwe
+ * @version $Id$
+ */
+public abstract class ProjectableAdapter implements Projectable{
+    
+    private Projectable projectable;
+    
+    public ProjectableAdapter(Projectable projectable){
+        this.projectable = projectable;
+    }
+
+    public long count() {
+        return projectable.count();
+    }
+
+    public Iterator<Object[]> iterate(Expr<?> e1, Expr<?> e2, Expr<?>... rest) {
+        return projectable.iterate(e1, e2, rest);
+    }
+
+    public <RT> Iterator<RT> iterate(Expr<RT> projection) {
+        return projectable.iterate(projection);
+    }
+
+    public List<Object[]> list(Expr<?> e1, Expr<?> e2, Expr<?>... rest) {
+        return projectable.list(e1, e2, rest);
+    }
+
+    public <RT> List<RT> list(Expr<RT> projection) {
+        return projectable.list(projection);
+    }
+
+    public <RT> RT uniqueResult(Expr<RT> expr) {
+        return projectable.uniqueResult(expr);
+    }
+
+}