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A library for relational-database-based persistence in Java.
There is a newer version: 1.7.5
//
// Depot library - a Java relational persistence library
// http://code.google.com/p/depot/source/browse/trunk/LICENSE

package com.samskivert.depot.impl;

import com.samskivert.depot.Key;

import com.samskivert.depot.clause.Distinct;
import com.samskivert.depot.clause.FieldDefinition;
import com.samskivert.depot.clause.ForUpdate;
import com.samskivert.depot.clause.FromOverride;
import com.samskivert.depot.clause.GroupBy;
import com.samskivert.depot.clause.InsertClause;
import com.samskivert.depot.clause.Join;
import com.samskivert.depot.clause.Limit;
import com.samskivert.depot.clause.OrderBy;
import com.samskivert.depot.clause.SelectClause;
import com.samskivert.depot.clause.WhereClause;

import com.samskivert.depot.expression.*;
import com.samskivert.depot.operator.Case;
import com.samskivert.depot.operator.FullText;

import com.samskivert.depot.impl.clause.CreateIndexClause;
import com.samskivert.depot.impl.clause.DeleteClause;
import com.samskivert.depot.impl.clause.DropIndexClause;
import com.samskivert.depot.impl.clause.UpdateClause;
import com.samskivert.depot.impl.expression.IntervalExp;
import com.samskivert.depot.impl.expression.LiteralExp;
import com.samskivert.depot.impl.expression.ValueExp;
import com.samskivert.depot.impl.expression.AggregateFun.Average;
import com.samskivert.depot.impl.expression.AggregateFun.Count;
import com.samskivert.depot.impl.expression.AggregateFun.Every;
import com.samskivert.depot.impl.expression.AggregateFun.Max;
import com.samskivert.depot.impl.expression.AggregateFun.Min;
import com.samskivert.depot.impl.expression.AggregateFun.Sum;
import com.samskivert.depot.impl.expression.ConditionalFun.Coalesce;
import com.samskivert.depot.impl.expression.ConditionalFun.Greatest;
import com.samskivert.depot.impl.expression.ConditionalFun.Least;
import com.samskivert.depot.impl.expression.DateFun.DatePart;
import com.samskivert.depot.impl.expression.DateFun.DateTruncate;
import com.samskivert.depot.impl.expression.DateFun.Now;
import com.samskivert.depot.impl.expression.NumericalFun.Abs;
import com.samskivert.depot.impl.expression.NumericalFun.Ceil;
import com.samskivert.depot.impl.expression.NumericalFun.Exp;
import com.samskivert.depot.impl.expression.NumericalFun.Floor;
import com.samskivert.depot.impl.expression.NumericalFun.Ln;
import com.samskivert.depot.impl.expression.NumericalFun.Log10;
import com.samskivert.depot.impl.expression.NumericalFun.Pi;
import com.samskivert.depot.impl.expression.NumericalFun.Power;
import com.samskivert.depot.impl.expression.NumericalFun.Random;
import com.samskivert.depot.impl.expression.NumericalFun.Round;
import com.samskivert.depot.impl.expression.NumericalFun.Sign;
import com.samskivert.depot.impl.expression.NumericalFun.Sqrt;
import com.samskivert.depot.impl.expression.NumericalFun.Trunc;
import com.samskivert.depot.impl.expression.StringFun.Length;
import com.samskivert.depot.impl.expression.StringFun.Lower;
import com.samskivert.depot.impl.expression.StringFun.Position;
import com.samskivert.depot.impl.expression.StringFun.Substring;
import com.samskivert.depot.impl.expression.StringFun.Trim;
import com.samskivert.depot.impl.expression.StringFun.Upper;
import com.samskivert.depot.impl.operator.BinaryOperator;
import com.samskivert.depot.impl.operator.Exists;
import com.samskivert.depot.impl.operator.In;
import com.samskivert.depot.impl.operator.IsNull;
import com.samskivert.depot.impl.operator.MultiOperator;
import com.samskivert.depot.impl.operator.Not;

/**
 * Enumerates visitation methods for every possible SQL expression type.
 */
public interface FragmentVisitor
{
    public T visit (FieldDefinition fieldOverride);
    public T visit (FromOverride fromOverride);
    public T visit (MultiOperator multiOperator);
    public T visit (BinaryOperator binaryOperator);
    public T visit (IsNull isNull);
    public T visit (In in);
    public T visit (FullText.Match match);
    public T visit (FullText.Rank match);
    public T visit (ColumnExp columnExp);
    public T visit (Not not);
    public T visit (Distinct distinct);
    public T visit (GroupBy groupBy);
    public T visit (ForUpdate forUpdate);
    public T visit (OrderBy orderBy);
    public T visit (Join join);
    public T visit (Limit limit);
    public T visit (LiteralExp literal);
    public T visit (ValueExp value);
    public T visit (IntervalExp interval);
    public T visit (WhereClause where);
    public T visit (Key.Expression key);
    public T visit (Exists exists);
    public T visit (SelectClause selectClause);
    public T visit (UpdateClause updateClause);
    public T visit (DeleteClause deleteClause);
    public T visit (InsertClause insertClause);
    public T visit (CreateIndexClause createIndexClause);
    public T visit (DropIndexClause dropIndexClause);
    public T visit (Case caseExp);

    // Numerical
    public T visit (Abs exp);
    public T visit (Ceil exp);
    public T visit (Exp exp);
    public T visit (Floor exp);
    public T visit (Ln exp);
    public T visit (Log10 exp);
    public T visit (Pi exp);
    public T visit (Power exp);
    public T visit (Random exp);
    public T visit (Round exp);
    public T visit (Sign exp);
    public T visit (Sqrt exp);
    public T visit (Trunc exp);

    // String
    public T visit (Length exp);
    public T visit (Lower exp);
    public T visit (Position exp);
    public T visit (Substring exp);
    public T visit (Trim exp);
    public T visit (Upper exp);

    // Date
    public T visit (DatePart exp);
    public T visit (DateTruncate exp);
    public T visit (Now exp);

    // Aggregation
    public T visit (Average exp);
    public T visit (Count exp);
    public T visit (Every exp);
    public T visit (Max exp);
    public T visit (Min exp);
    public T visit (Sum exp);

    // Conditional
    public T visit (Coalesce exp);
    public T visit (Greatest exp);
    public T visit (Least exp);
}