Modified the TOP expression to accept parentheses also;

Author: Pap Lőrinc

src/main/java/net/sf/jsqlparser/statement/select/Top.java

@@ -22,31 +22,57 @@
 package net.sf.jsqlparser.statement.select;
 
 /**
- * A top clause in the form [TOP row_count]
+ * A top clause in the form [TOP (row_count) or TOP row_count]
  */
 public class Top {
 
 	private long rowCount;
 	private boolean rowCountJdbcParameter = false;
+	private boolean hasParenthesis = false;
 
 	public long getRowCount() {
 		return rowCount;
 	}
 
-	public void setRowCount(long l) {
-		rowCount = l;
+    // TODO instead of a plain number, an expression should be added, which could be a NumberExpression, a GroupedExpression or a JdbcParameter
+    public void setRowCount(long rowCount) {
+		this.rowCount = rowCount;
 	}
 
 	public boolean isRowCountJdbcParameter() {
 		return rowCountJdbcParameter;
 	}
 
-	public void setRowCountJdbcParameter(boolean b) {
-		rowCountJdbcParameter = b;
+	public void setRowCountJdbcParameter(boolean rowCountJdbcParameter) {
+		this.rowCountJdbcParameter = rowCountJdbcParameter;
 	}
 
-	@Override
-	public String toString() {
-		return "TOP " + (rowCountJdbcParameter ? "?" : rowCount + "");
-	}
+    public boolean hasParenthesis()
+    {
+        return hasParenthesis;
+    }
+
+    public void setParenthesis(boolean hasParenthesis)
+    {
+        this.hasParenthesis = hasParenthesis;
+    }
+
+    @Override
+    public String toString() {
+        String result = "TOP ";
+
+        if ( hasParenthesis) {
+            result += "(";
+        }
+
+        result += rowCountJdbcParameter ? "?"
+                                        : rowCount;
+
+        if (hasParenthesis)
+        {
+            result += ")";
+        }
+
+        return result;
+    }
 }

src/main/javacc/net/sf/jsqlparser/parser/JSqlParserCC.jj

@@ -1083,18 +1083,24 @@ Limit Limit():
 	}
 }
 
+// according to http://technet.microsoft.com/en-us/library/ms189463.aspx
 Top Top():
 {
 	Top top = new Top();
 	Token token = null;
 }
 {
+    // TODO the inside should be extracted, ? should be added as a new JdbcParameter and the parenthesis should wrap them with a GroupedExpression
 	<K_TOP>
-	 (
-	 	token=<S_LONG> { top.setRowCount(Long.parseLong(token.image)); }
-	 	|
-	 	"?" { top.setRowCountJdbcParameter(true);}
-	 )
+	(
+	 	token=<S_LONG>                      { top.setRowCount(Long.parseLong(token.image)); }
+	   |
+	 	"?"                                 { top.setRowCountJdbcParameter(true);}
+	   |
+	 	LOOKAHEAD(2) "(" token=<S_LONG> ")" { top.setRowCount(Long.parseLong(token.image)); top.setParenthesis(true);}
+	   |
+	 	LOOKAHEAD(2) "(" "?" ")"            { top.setRowCountJdbcParameter(true); top.setParenthesis(true);}
+	)
 	{
 		return top;
 	}
@@ -1116,7 +1122,7 @@ Expression Expression():
     { return retval; }
 }
 
-Expression OrExpression()  :
+Expression OrExpression():
 {
 	Expression left, right, result;
 }

src/test/java/net/sf/jsqlparser/test/select/SelectTest.java

@@ -13,8 +13,6 @@
 
 import java.io.*;
 import java.util.*;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
 import static net.sf.jsqlparser.test.TestUtils.*;
 
@@ -265,9 +263,16 @@ public void testTop() throws JSQLParserException {
 		statement = "select top 5 foo from bar";
 		select = (Select) parserManager.parse(new StringReader(statement));
 		assertEquals(5, ((PlainSelect) select.getSelectBody()).getTop().getRowCount());
-
 	}
 
+    public void testTopWithParenthesis() throws JSQLParserException {
+		final String statement = "SELECT TOP (5) PERCENT JobTitle, HireDate FROM HumanResources.Employee ORDER BY HireDate DESC";
+        final Select select = (Select) parserManager.parse(new StringReader(statement));
+
+        assertEquals(5, ((PlainSelect) select.getSelectBody()).getTop().getRowCount());
+        assertStatementCanBeDeparsedAs(select, statement);
+    }
+
 	public void testSelectItems() throws JSQLParserException {
 		String statement = "SELECT myid AS MYID, mycol, tab.*, schema.tab.*, mytab.mycol2, myschema.mytab.mycol, myschema.mytab.* FROM mytable WHERE mytable.col = 9";
 		Select select = (Select) parserManager.parse(new StringReader(statement));