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/*
* Copyright (c) 2023 OceanBase.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.oceanbase.tools.sqlparser.adapter.mysql;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.antlr.v4.runtime.ParserRuleContext;
import org.antlr.v4.runtime.RuleContext;
import org.antlr.v4.runtime.tree.TerminalNode;
import com.oceanbase.tools.sqlparser.adapter.StatementFactory;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.ExprContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.From_listContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.Groupby_clauseContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.Insert_valsContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.Named_windowsContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.No_table_selectContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.No_table_select_with_order_and_limitContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.Query_expression_option_listContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.Select_clause_setContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.Select_clause_set_with_order_and_limitContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.Select_expr_listContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.Select_no_parensContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.Select_with_parensContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.Select_with_parens_with_order_and_limitContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.Set_expression_optionContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.Set_typeContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.Simple_selectContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.Simple_select_with_order_and_limitContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.Table_referencesContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.Table_values_clauseContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.Table_values_clause_with_order_by_and_limitContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParser.With_clauseContext;
import com.oceanbase.tools.sqlparser.obmysql.OBParserBaseVisitor;
import com.oceanbase.tools.sqlparser.statement.Expression;
import com.oceanbase.tools.sqlparser.statement.common.Window;
import com.oceanbase.tools.sqlparser.statement.expression.ConstExpression;
import com.oceanbase.tools.sqlparser.statement.select.ForUpdate;
import com.oceanbase.tools.sqlparser.statement.select.FromReference;
import com.oceanbase.tools.sqlparser.statement.select.GroupBy;
import com.oceanbase.tools.sqlparser.statement.select.NameReference;
import com.oceanbase.tools.sqlparser.statement.select.OrderBy;
import com.oceanbase.tools.sqlparser.statement.select.Projection;
import com.oceanbase.tools.sqlparser.statement.select.RelatedSelectBody;
import com.oceanbase.tools.sqlparser.statement.select.RelationType;
import com.oceanbase.tools.sqlparser.statement.select.SelectBody;
import com.oceanbase.tools.sqlparser.statement.select.SortKey;
import com.oceanbase.tools.sqlparser.statement.select.WithTable;
import com.oceanbase.tools.sqlparser.statement.select.mysql.Limit;
import lombok.NonNull;
/**
* {@link MySQLSelectBodyFactory}
*
* @author yh263208
* @date 2022-12-11 23:52
* @since ODC_release_4.1.0
* @see StatementFactory
*/
public class MySQLSelectBodyFactory
extends OBParserBaseVisitor implements StatementFactory {
private Select_no_parensContext selectNoParensContext = null;
private Select_with_parensContext selectWithParensContext = null;
public MySQLSelectBodyFactory(@NonNull Select_no_parensContext selectNoParensContext) {
this.selectNoParensContext = selectNoParensContext;
}
public MySQLSelectBodyFactory(@NonNull Select_with_parensContext selectWithParensContext) {
this.selectWithParensContext = selectWithParensContext;
}
@Override
public SelectBody generate() {
if (this.selectWithParensContext != null) {
return visit(this.selectWithParensContext);
}
return visit(this.selectNoParensContext);
}
@Override
public SelectBody visitSelect_with_parens(Select_with_parensContext ctx) {
SelectBody select;
if (ctx.select_no_parens() != null) {
select = new SelectBody(ctx, visit(ctx.select_no_parens()));
} else {
select = new SelectBody(ctx, visit(ctx.select_with_parens()));
}
if (ctx.with_clause() != null) {
With_clauseContext w = ctx.with_clause();
if (w.RECURSIVE() != null) {
select.setRecursive(true);
}
select.getWith().addAll(w.with_list().common_table_expr().stream().map(c -> {
StatementFactory factory = new MySQLWithTableFactory(c);
return factory.generate();
}).collect(Collectors.toList()));
}
return select;
}
@Override
public SelectBody visitSelect_no_parens(Select_no_parensContext ctx) {
SelectBody select;
if (ctx.select_clause() != null) {
select = new SelectBody(ctx, visit(ctx.select_clause()));
} else if (ctx.select_clause_set() != null) {
select = new SelectBody(ctx, visit(ctx.select_clause_set()));
} else {
select = new SelectBody(ctx, visit(ctx.select_clause_set_with_order_and_limit()));
}
if (ctx.for_update_clause() != null) {
StatementFactory factory = new MySQLForUpdateFactory(ctx.for_update_clause());
select.getLastSelectBody().setForUpdate(factory.generate());
}
if (ctx.opt_lock_in_share_mode() != null) {
select.getLastSelectBody().setLockInShareMode(true);
}
return select;
}
@Override
public SelectBody visitTable_values_clause(Table_values_clauseContext ctx) {
return new SelectBody(ctx, ctx.values_row_list().row_value().stream()
.map(c -> getValueRows(c.insert_vals())).collect(Collectors.toList()));
}
@Override
public SelectBody visitTable_values_clause_with_order_by_and_limit(
Table_values_clause_with_order_by_and_limitContext ctx) {
SelectBody selectBody = new SelectBody(ctx, visit(ctx.table_values_clause()));
if (ctx.order_by() != null) {
selectBody.setOrderBy(new MySQLOrderByFactory(ctx.order_by()).generate());
}
if (ctx.limit_clause() != null) {
selectBody.setLimit(new MySQLLimitFactory(ctx.limit_clause()).generate());
}
return selectBody;
}
@Override
public SelectBody visitSelect_with_parens_with_order_and_limit(Select_with_parens_with_order_and_limitContext ctx) {
SelectBody select = new SelectBody(ctx, visit(ctx.select_with_parens()));
if (ctx.order_by() != null) {
StatementFactory factory = new MySQLOrderByFactory(ctx.order_by());
select.getLastSelectBody().setOrderBy(factory.generate());
}
if (ctx.limit_clause() != null) {
StatementFactory factory = new MySQLLimitFactory(ctx.limit_clause());
select.getLastSelectBody().setLimit(factory.generate());
}
return select;
}
@Override
public SelectBody visitSelect_clause_set_with_order_and_limit(Select_clause_set_with_order_and_limitContext ctx) {
SelectBody select = new SelectBody(ctx, visit(ctx.select_clause_set()));
if (ctx.order_by() != null) {
StatementFactory factory = new MySQLOrderByFactory(ctx.order_by());
select.getLastSelectBody().setOrderBy(factory.generate());
}
if (ctx.limit_clause() != null) {
StatementFactory factory = new MySQLLimitFactory(ctx.limit_clause());
select.getLastSelectBody().setLimit(factory.generate());
}
return select;
}
@Override
public SelectBody visitSelect_clause_set(Select_clause_setContext ctx) {
SelectBody left = null;
if (ctx.select_clause_set() != null) {
left = new SelectBody(ctx, visit(ctx.select_clause_set()));
if (ctx.order_by() != null) {
StatementFactory factory = new MySQLOrderByFactory(ctx.order_by());
left.getLastSelectBody().setOrderBy(factory.generate());
}
if (ctx.limit_clause() != null) {
StatementFactory factory = new MySQLLimitFactory(ctx.limit_clause());
left.getLastSelectBody().setLimit(factory.generate());
}
} else if (ctx.select_clause_set_left() != null) {
left = new SelectBody(ctx, visit(ctx.select_clause_set_left()));
}
if (left == null) {
throw new IllegalStateException("Missing left clause");
}
RelationType type = getRelationType(ctx.set_type());
SelectBody right = visit(ctx.select_clause_set_right());
left.getLastSelectBody().setRelatedSelect(new RelatedSelectBody(right, type));
return left;
}
private RelationType getRelationType(Set_typeContext setType) {
if (setType.set_type_other() != null) {
return RelationType.valueOf(setType.set_type_other().getText().toUpperCase());
}
Set_expression_optionContext op = setType.set_expression_option();
if (op != null) {
if (op.ALL() != null) {
return RelationType.UNION_ALL;
} else if (op.DISTINCT() != null) {
return RelationType.UNION_DISTINCT;
} else if (op.UNIQUE() != null) {
return RelationType.UNION_UNIQUE;
}
}
return RelationType.UNION;
}
@Override
public SelectBody visitSimple_select_with_order_and_limit(Simple_select_with_order_and_limitContext ctx) {
SelectBody select = new SelectBody(ctx, visit(ctx.simple_select()));
if (ctx.order_by() != null) {
StatementFactory factory = new MySQLOrderByFactory(ctx.order_by());
select.setOrderBy(factory.generate());
}
if (ctx.limit_clause() != null) {
StatementFactory factory = new MySQLLimitFactory(ctx.limit_clause());
select.setLimit(factory.generate());
}
return select;
}
@Override
public SelectBody visitSimple_select(Simple_selectContext ctx) {
return visitSelect(new SelectContext() {
@Override
public ParserRuleContext getTarget() {
return ctx;
}
@Override
public Select_expr_listContext projectionList() {
return ctx.select_expr_list();
}
@Override
public List fromList() {
return visitFromList(ctx.from_list());
}
@Override
public Groupby_clauseContext groupClause() {
return ctx.groupby_clause();
}
@Override
public TerminalNode whereNode() {
return ctx.WHERE();
}
@Override
public TerminalNode havingNode() {
return ctx.HAVING();
}
@Override
public List exprList() {
return ctx.expr();
}
@Override
public Query_expression_option_listContext queryOptionList() {
return ctx.query_expression_option_list();
}
@Override
public Named_windowsContext namedWindows() {
return ctx.named_windows();
}
});
}
@Override
public SelectBody visitNo_table_select_with_order_and_limit(No_table_select_with_order_and_limitContext ctx) {
SelectBody select = new SelectBody(ctx, visit(ctx.no_table_select()));
if (ctx.order_by() != null) {
StatementFactory factory = new MySQLOrderByFactory(ctx.order_by());
select.setOrderBy(factory.generate());
}
if (ctx.limit_clause() != null) {
StatementFactory factory = new MySQLLimitFactory(ctx.limit_clause());
select.setLimit(factory.generate());
}
return select;
}
@Override
public SelectBody visitNo_table_select(No_table_selectContext ctx) {
return visitSelect(new SelectContext() {
@Override
public ParserRuleContext getTarget() {
return ctx;
}
@Override
public Select_expr_listContext projectionList() {
return ctx.select_expr_list();
}
@Override
public List fromList() {
if (ctx.DUAL() == null) {
return new ArrayList<>();
}
FromReference ref = new NameReference(ctx.DUAL(), null, ctx.DUAL().getText(), null);
return Collections.singletonList(ref);
}
@Override
public Groupby_clauseContext groupClause() {
return ctx.groupby_clause();
}
@Override
public TerminalNode whereNode() {
return ctx.WHERE();
}
@Override
public TerminalNode havingNode() {
return ctx.HAVING();
}
@Override
public List exprList() {
return ctx.expr();
}
@Override
public Query_expression_option_listContext queryOptionList() {
return ctx.query_expression_option_list();
}
@Override
public Named_windowsContext namedWindows() {
return ctx.named_windows();
}
});
}
private SelectBody visitSelect(SelectContext ctx) {
List selectItems = visitProjectionList(ctx.projectionList());
SelectBody select = new SelectBody(ctx.getTarget(), selectItems, ctx.fromList());
ExprContext where = null;
ExprContext having = null;
if (ctx.whereNode() != null && ctx.havingNode() != null) {
// 既有 where 子句，也有 having 子句，此时第一个 expr 是 where 的，第二个是 having 的
where = ctx.exprList().get(0);
if (where == null) {
throw new IllegalStateException("Missing where clause");
}
having = ctx.exprList().get(1);
if (having == null) {
throw new IllegalStateException("Missing having clause");
}
} else if (ctx.whereNode() == null && ctx.havingNode() != null) {
having = ctx.exprList().get(0);
} else if (ctx.havingNode() == null && ctx.whereNode() != null) {
where = ctx.exprList().get(0);
}
if (where != null) {
StatementFactory factory = new MySQLExpressionFactory(where);
select.setWhere(factory.generate());
}
if (having != null) {
StatementFactory factory = new MySQLExpressionFactory(having);
select.setHaving(factory.generate());
}
if (ctx.groupClause() != null) {
if (ctx.groupClause().ROLLUP() != null) {
select.setWithRollUp(true);
}
select.setGroupBy(visitGroupByClause(ctx.groupClause()));
}
if (ctx.queryOptionList() != null) {
select.setQueryOptions(getQueryExpr(ctx.queryOptionList()));
}
if (ctx.namedWindows() != null) {
select.setWindows(visitNamedWindows(ctx.namedWindows()));
}
return select;
}
private List visitProjectionList(Select_expr_listContext context) {
return context.projection().stream().map(child -> {
StatementFactory factory = new MySQLProjectionFactory(child);
return factory.generate();
}).collect(Collectors.toList());
}
public static List visitFromList(From_listContext context) {
return visitFromList(context.table_references());
}
public static List visitFromList(Table_referencesContext context) {
List fromRefs = context.table_reference().stream().map(c -> {
StatementFactory factory = new MySQLFromReferenceFactory(c);
return factory.generate();
}).collect(Collectors.toList());
fromRefs.addAll(context.table_references_paren().stream().flatMap(t -> {
Stream s2 = t.table_reference().stream().map(r -> {
StatementFactory factory = new MySQLFromReferenceFactory(r);
return factory.generate();
});
if (t.table_references_paren() == null) {
return s2;
}
Stream s1 = t.table_references_paren().table_reference().stream().map(r -> {
StatementFactory factory = new MySQLFromReferenceFactory(r);
return factory.generate();
});
return Stream.concat(s1, s2);
}).collect(Collectors.toList()));
return fromRefs;
}
private List visitGroupByClause(Groupby_clauseContext context) {
return context.sort_list_for_group_by().sort_key_for_group_by().stream().map(c -> {
StatementFactory factory = new MySQLSortKeyFactory(c);
return factory.generate();
}).collect(Collectors.toList());
}
private List visitNamedWindows(Named_windowsContext context) {
return context.named_window().stream().map(c -> {
StatementFactory factory = new MySQLWindowFactory(c);
return factory.generate();
}).collect(Collectors.toList());
}
private String getQueryExpr(Query_expression_option_listContext context) {
return context.query_expression_option().stream().map(RuleContext::getText).collect(Collectors.joining(" "));
}
private List getValueRows(Insert_valsContext ctx) {
Expression expr = null;
if (ctx.expr_or_default() != null) {
if (ctx.expr_or_default().expr() == null) {
expr = new ConstExpression(ctx.expr_or_default().DEFAULT());
} else {
expr = new MySQLExpressionFactory(ctx.expr_or_default().expr()).generate();
}
}
if (ctx.empty() != null || expr == null) {
return new ArrayList<>();
}
List exprs;
if (ctx.insert_vals() == null) {
exprs = new ArrayList<>();
} else {
exprs = getValueRows(ctx.insert_vals());
}
exprs.add(expr);
return exprs;
}
/**
* {@link SelectContext}
*
* @author yh263208
* @date 2022-12-07 18:21
* @since ODC_release_4.1.0
*/
interface SelectContext {
ParserRuleContext getTarget();
Select_expr_listContext projectionList();
List fromList();
Groupby_clauseContext groupClause();
TerminalNode whereNode();
TerminalNode havingNode();
List exprList();
Query_expression_option_listContext queryOptionList();
Named_windowsContext namedWindows();
}
}
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