SqlNodeVisitor.cs

Go to the documentation of this file.

// 
//  Copyright 2010-2015 Deveel
// 
//    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.
//

using System;
using System.Collections.Generic;
using System.Linq;

namespace Deveel.Data.Sql.Parser {
    class SqlNodeVisitor : ISqlNodeVisitor {
        public virtual void Visit(ISqlNode node) {
            if (node is IntegerLiteralNode) {
                VisitIntegerLiteral((IntegerLiteralNode) node);
            } else if (node is NumberLiteralNode) {
                VisitNumberLiteral((NumberLiteralNode) node);
            } else if (node is StringLiteralNode) {
                VisitStringLiteral((StringLiteralNode) node);
            } else if (node is DataTypeNode) {
                VisitDataType((DataTypeNode) node);
            } else if (node is IExpressionNode) {
                VisitExpression((IExpressionNode) node);
            } else if (node is IStatementNode) {
                VisitStatement((IStatementNode) node);
            } else if (node is ISqlVisitableNode) {
                ((ISqlVisitableNode) node).Accept(this);
            }
        }

        public virtual void VisitStringLiteral(StringLiteralNode node) {
        }

        public virtual void VisitNumberLiteral(NumberLiteralNode node) {
        }

        public virtual void VisitIntegerLiteral(IntegerLiteralNode node) {
        }

        public virtual void VisitDataType(DataTypeNode node) {
        }

        public virtual void VisitExpression(IExpressionNode node) {
            if (node == null)
                return;
            
            if (node is SqlConstantExpressionNode) {
                VisitConstantExpression((SqlConstantExpressionNode) node);
            } else if (node is SqlReferenceExpressionNode) {
                VisitReferenceExpression((SqlReferenceExpressionNode) node);
            } else if (node is SqlVariableRefExpressionNode) {
                VisitVariableRefExpression((SqlVariableRefExpressionNode) node);
            } else if (node is SqlBetweenExpressionNode) {
                VisitBetweenExpression((SqlBetweenExpressionNode) node);
            } else if (node is SqlCaseExpressionNode) {
                VisitCaseExpression((SqlCaseExpressionNode) node);
            } else if (node is SqlFunctionCallExpressionNode) {
                VisitFunctionCall((SqlFunctionCallExpressionNode) node);
            } else if (node is SqlExpressionTupleNode) {
                VisitTupleExpression((SqlExpressionTupleNode) node);
            } else if (node is SqlBinaryExpressionNode) {
                VisitBinaryExpression((SqlBinaryExpressionNode) node);
            } else if (node is SqlUnaryExpressionNode) {
                VisitUnaryExpression((SqlUnaryExpressionNode) node);
            } else if (node is SqlQueryExpressionNode) {
                VisitQueryExpression((SqlQueryExpressionNode) node);
            } else {
                throw new InvalidOperationException(String.Format("The expression node of type '{0}' is invalid.", node.GetType()));
            }
        }

        public virtual void VisitNodeList(IEnumerable<ISqlNode> nodes) {
            foreach (var node in nodes) {
                Visit(node);
            }
        }

        #region Expressions

        public virtual void VisitQueryExpression(SqlQueryExpressionNode node) {
        }

        public virtual void VisitTupleExpression(SqlExpressionTupleNode node) {
            var exps = node.Expressions;
            if (exps != null)
                VisitNodeList(exps.Cast<ISqlNode>());
        }

        public virtual void VisitUnaryExpression(SqlUnaryExpressionNode node) {
        }

        public virtual void VisitBinaryExpression(SqlBinaryExpressionNode node) {
        }

        public virtual void VisitFunctionCall(SqlFunctionCallExpressionNode node) {
        }

        public virtual void VisitCaseExpression(SqlCaseExpressionNode node) {
        }

        public virtual void VisitBetweenExpression(SqlBetweenExpressionNode node) {
        }

        public virtual void VisitVariableRefExpression(SqlVariableRefExpressionNode node) {
        }

        public virtual void VisitConstantExpression(SqlConstantExpressionNode node) {
        }

        public virtual void VisitReferenceExpression(SqlReferenceExpressionNode node) {
        }

        #endregion

        #region Statements

        public virtual void VisitStatement(IStatementNode node) {
            if (node is CreateTableNode)
                VisitCreateTable((CreateTableNode) node);
            if (node is CreateViewNode)
                VisitCreateView((CreateViewNode) node);
            if (node is CreateTriggerNode) {
                VisitCreateTrigger((CreateTriggerNode) node);
            } else if (node is SelectStatementNode) {
                VisitSelect((SelectStatementNode) node);
            } else if (node is UpdateStatementNode) {
                VisitUpdate((UpdateStatementNode) node);
            } else if (node is InsertStatementNode) {
                VisitInsert((InsertStatementNode) node);
            }
        }

        public virtual void VisitSelect(SelectStatementNode node) {
            var exp = node.QueryExpression;
            if (exp != null)
                VisitExpression(exp);
        }

        public virtual  void VisitCreateTrigger(CreateTriggerNode node) {
            if (node.ProcedureArguments != null)
                VisitNodeList(node.ProcedureArguments);

            // TODO: handle the body
        }

        public virtual void VisitCreateView(CreateViewNode node) {
        }

        public virtual void VisitCreateTable(CreateTableNode node) {
            if (node.Columns != null)
                VisitTableColumns(node.Columns);
            if (node.Constraints != null)
                VisitTableConstraints(node.Constraints);
        }

        public virtual void VisitAlterTable(AlterTableNode node) {
            if (node.CreateTable != null)
                VisitCreateTable(node.CreateTable);

            if (node.Actions != null) {
                foreach (var action in node.Actions) {
                    VisitAlterTableAction(action);
                }
            }
        }

        public virtual void VisitAlterTableAction(IAlterActionNode action) {
        }

        public virtual void VisitTableConstraints(IEnumerable<TableConstraintNode> constraints) {
            foreach (var constraint in constraints) {
                VisitTableConstraint(constraint);
            }
        }

        public virtual void VisitTableConstraint(TableConstraintNode arg) {
            
        }

        public virtual void VisitTableColumns(IEnumerable<TableColumnNode> columnNodes) {
        }

        public virtual void VisitUpdate(UpdateStatementNode node) {
            if (node.SimpleUpdate != null)
                VisitSimpleUpdate(node.SimpleUpdate);
            if (node.QueryUpdate != null)
                VisitQueryUpdate(node.QueryUpdate);
        }

        public virtual void VisitSimpleUpdate(SimpleUpdateNode node) {
            
        }

        public virtual void VisitQueryUpdate(QueryUpdateNode node) {
            
        }


        public virtual void VisitInsert(InsertStatementNode node) {
        }


        #endregion
    }
}