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expression.go
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expression.go
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package jet
import (
"errors"
)
// Expression is common interface for all expressions.
// Can be Bool, Int, Float, String, Date, Time, Timez, Timestamp or Timestampz expressions.
type Expression interface {
clause
projection
groupByClause
orderByClause
// Test expression whether it is a NULL value.
IS_NULL() BoolExpression
// Test expression whether it is a non-NULL value.
IS_NOT_NULL() BoolExpression
// Check if this expressions matches any in expressions list
IN(expressions ...Expression) BoolExpression
// Check if this expressions is different of all expressions in expressions list
NOT_IN(expressions ...Expression) BoolExpression
// The temporary alias name to assign to the expression
AS(alias string) projection
// Expression will be used to sort query result in ascending order
ASC() orderByClause
// Expression will be used to sort query result in ascending order
DESC() orderByClause
}
type expressionInterfaceImpl struct {
parent Expression
}
func (e *expressionInterfaceImpl) from(subQuery SelectTable) projection {
return e.parent
}
func (e *expressionInterfaceImpl) IS_NULL() BoolExpression {
return newPostifxBoolExpression(e.parent, "IS NULL")
}
func (e *expressionInterfaceImpl) IS_NOT_NULL() BoolExpression {
return newPostifxBoolExpression(e.parent, "IS NOT NULL")
}
func (e *expressionInterfaceImpl) IN(expressions ...Expression) BoolExpression {
return newBinaryBoolOperator(e.parent, WRAP(expressions...), "IN")
}
func (e *expressionInterfaceImpl) NOT_IN(expressions ...Expression) BoolExpression {
return newBinaryBoolOperator(e.parent, WRAP(expressions...), "NOT IN")
}
func (e *expressionInterfaceImpl) AS(alias string) projection {
return newAlias(e.parent, alias)
}
func (e *expressionInterfaceImpl) ASC() orderByClause {
return newOrderByClause(e.parent, true)
}
func (e *expressionInterfaceImpl) DESC() orderByClause {
return newOrderByClause(e.parent, false)
}
func (e *expressionInterfaceImpl) serializeForGroupBy(statement statementType, out *sqlBuilder) error {
return e.parent.serialize(statement, out, noWrap)
}
func (e *expressionInterfaceImpl) serializeForProjection(statement statementType, out *sqlBuilder) error {
return e.parent.serialize(statement, out, noWrap)
}
func (e *expressionInterfaceImpl) serializeForOrderBy(statement statementType, out *sqlBuilder) error {
return e.parent.serialize(statement, out, noWrap)
}
// Representation of binary operations (e.g. comparisons, arithmetic)
type binaryOpExpression struct {
lhs, rhs Expression
operator string
}
func newBinaryExpression(lhs, rhs Expression, operator string) binaryOpExpression {
binaryExpression := binaryOpExpression{
lhs: lhs,
rhs: rhs,
operator: operator,
}
return binaryExpression
}
func (c *binaryOpExpression) serialize(statement statementType, out *sqlBuilder, options ...serializeOption) error {
if c == nil {
return errors.New("jet: binary Expression is nil")
}
if c.lhs == nil {
return errors.New("jet: nil lhs")
}
if c.rhs == nil {
return errors.New("jet: nil rhs")
}
wrap := !contains(options, noWrap)
if wrap {
out.writeString("(")
}
if err := c.lhs.serialize(statement, out); err != nil {
return err
}
out.writeString(c.operator)
if err := c.rhs.serialize(statement, out); err != nil {
return err
}
if wrap {
out.writeString(")")
}
return nil
}
// A prefix operator Expression
type prefixOpExpression struct {
expression Expression
operator string
}
func newPrefixExpression(expression Expression, operator string) prefixOpExpression {
prefixExpression := prefixOpExpression{
expression: expression,
operator: operator,
}
return prefixExpression
}
func (p *prefixOpExpression) serialize(statement statementType, out *sqlBuilder, options ...serializeOption) error {
if p == nil {
return errors.New("jet: Prefix Expression is nil")
}
out.writeString(p.operator + " ")
if p.expression == nil {
return errors.New("jet: nil prefix Expression")
}
if err := p.expression.serialize(statement, out); err != nil {
return err
}
return nil
}
// A postifx operator Expression
type postfixOpExpression struct {
expression Expression
operator string
}
func newPostfixOpExpression(expression Expression, operator string) postfixOpExpression {
postfixOpExpression := postfixOpExpression{
expression: expression,
operator: operator,
}
return postfixOpExpression
}
func (p *postfixOpExpression) serialize(statement statementType, out *sqlBuilder, options ...serializeOption) error {
if p == nil {
return errors.New("jet: Postifx operator Expression is nil")
}
if p.expression == nil {
return errors.New("jet: nil prefix Expression")
}
if err := p.expression.serialize(statement, out); err != nil {
return err
}
out.writeString(p.operator)
return nil
}