refactor parser

src/main/java/com/alibaba/druid/sql/ast/statement/SQLSelectQuery.java

@@ -19,7 +19,7 @@ import com.alibaba.druid.sql.ast.SQLObject;
 
 public interface SQLSelectQuery extends SQLObject {
     boolean isParenthesized();
-    void setParenthesized(boolean paren);
+    void setParenthesized(boolean parenthesized);
 
     SQLSelectQuery clone();
 }

src/main/java/com/alibaba/druid/sql/ast/statement/SQLSelectQueryBase.java

@@ -0,0 +1,19 @@
+package com.alibaba.druid.sql.ast.statement;
+
+import com.alibaba.druid.sql.ast.SQLObjectImpl;
+
+public abstract class SQLSelectQueryBase extends SQLObjectImpl implements SQLSelectQuery {
+    protected boolean parenthesized;
+
+    @Override
+    public boolean isParenthesized() {
+        return parenthesized;
+    }
+
+    @Override
+    public void setParenthesized(boolean parenthesized) {
+        this.parenthesized = parenthesized;
+    }
+
+    public abstract SQLSelectQueryBase clone();
+}

src/main/java/com/alibaba/druid/sql/ast/statement/SQLSelectQueryBlock.java

@@ -29,7 +29,7 @@ import java.util.Collections;
 import java.util.List;
 import java.util.TreeSet;
 
-public class SQLSelectQueryBlock extends SQLObjectImpl implements SQLSelectQuery, SQLReplaceable, SQLDbTypedObject {
+public class SQLSelectQueryBlock extends SQLSelectQueryBase implements SQLReplaceable, SQLDbTypedObject {
     protected int                        distionOption;
     protected final List<SQLSelectItem>  selectList      = new ArrayList<SQLSelectItem>();
 
@@ -47,7 +47,6 @@ public class SQLSelectQueryBlock extends SQLObjectImpl implements SQLSelectQuery
     protected SQLSelectGroupByClause     groupBy;
     protected List<SQLWindow>            windows;
     protected SQLOrderBy                 orderBy;
-    protected boolean                    parenthesized   = false;
     protected boolean                    forUpdate       = false;
     protected boolean                    noWait          = false;
     protected boolean                    skipLocked      = false;
@@ -1004,16 +1003,6 @@ public class SQLSelectQueryBlock extends SQLObjectImpl implements SQLSelectQuery
         }
     }
 
-    @Override
-    public boolean isParenthesized() {
-        return parenthesized;
-    }
-
-    @Override
-    public void setParenthesized(boolean paren) {
-        this.parenthesized = paren;
-    }
-
     public SQLTableSource findTableSource(String alias) {
         if (from == null) {
             return null;

src/main/java/com/alibaba/druid/sql/ast/statement/SQLUnionQuery.java

@@ -27,10 +27,7 @@ import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 
-public class SQLUnionQuery extends SQLObjectImpl implements SQLSelectQuery, SQLDbTypedObject {
-
-    private boolean parenthesized = false;
-
+public class SQLUnionQuery extends SQLSelectQueryBase implements SQLDbTypedObject {
     private List<SQLSelectQuery> relations = new ArrayList<SQLSelectQuery>();
     private SQLUnionOperator operator = SQLUnionOperator.UNION;
     private SQLOrderBy       orderBy;
@@ -168,14 +165,6 @@ public class SQLUnionQuery extends SQLObjectImpl implements SQLSelectQuery, SQLD
         this.limit = limit;
     }
 
-    public boolean isParenthesized() {
-        return parenthesized;
-    }
-
-    public void setParenthesized(boolean paren) {
-        this.parenthesized = paren;
-    }
-
     public SQLUnionQuery clone() {
         SQLUnionQuery x = new SQLUnionQuery();
 

src/main/java/com/alibaba/druid/sql/ast/statement/SQLValuesQuery.java

@@ -23,9 +23,7 @@ import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 import java.util.ArrayList;
 import java.util.List;
 
-public class SQLValuesQuery extends SQLObjectImpl implements SQLSelectQuery {
-    private boolean parenthesized = false;
-
+public class SQLValuesQuery extends SQLSelectQueryBase {
     private List<SQLExpr> values = new ArrayList<SQLExpr>();
 
     public List<SQLExpr> getValues() {
@@ -45,16 +43,6 @@ public class SQLValuesQuery extends SQLObjectImpl implements SQLSelectQuery {
         visitor.endVisit(this);
     }
 
-    @Override
-    public boolean isParenthesized() {
-        return parenthesized;
-    }
-
-    @Override
-    public void setParenthesized(boolean paren) {
-        this.parenthesized = paren;
-    }
-
     public SQLValuesQuery clone() {
         SQLValuesQuery x = new SQLValuesQuery();
         x.parenthesized = parenthesized;