wip

src/main/java/jef/operations/CountOp.java

@@ -0,0 +1,36 @@
+package jef.operations;
+
+import jef.Queryable;
+import jef.expressions.Expression;
+import jef.expressions.SelectExpression;
+import jef.expressions.selectable.DatabaseFunctionExpression;
+
+import java.io.Serializable;
+import java.util.List;
+
+public class CountOp<T extends Serializable> implements Operation<T> {
+    private final Queryable<T> queryable;
+
+    public CountOp(Queryable<T> queryable) {
+        this.queryable = queryable;
+    }
+
+    @Override
+    public String getTableAlias() {
+        return String.valueOf((char) (queryable.getTableAlias().charAt(0) + (char) 1));
+    }
+
+    @Override
+    public Expression getExpression() {
+        return new SelectExpression(List.of(new DatabaseFunctionExpression("count(*)")), queryable.getExpression(), getTableAlias());
+    }
+
+//    @Override
+//    public CountOp<T> clone() {
+//        return new CountOp<>(queryable.clone());
+//    }
+
+    public long execute() {
+        return 0;//TODO implement when sql execution part is ready
+    }
+}