Package org.h2.expression.function

Class CastSpecification

java.lang.Object

org.h2.expression.Expression

org.h2.expression.Operation1

org.h2.expression.function.Function1

org.h2.expression.function.CastSpecification

All Implemented Interfaces:

NamedExpression, HasSQL, Typed

public final class CastSpecification
extends Function1

A cast specification.

Field Summary

Fields

Modifier and Type	Field	Description
private Domain	domain

Fields inherited from class org.h2.expression.Operation1

arg, type

Fields inherited from class org.h2.expression.Expression

AUTO_PARENTHESES, MAP_IN_AGGREGATE, MAP_IN_WINDOW, MAP_INITIAL, WITH_PARENTHESES, WITHOUT_PARENTHESES

Fields inherited from interface org.h2.util.HasSQL

ADD_PLAN_INFORMATION, DEFAULT_SQL_FLAGS, NO_CASTS, QUOTE_ONLY_WHEN_REQUIRED, REPLACE_LOBS_FOR_TRACE, TRACE_SQL_FLAGS

Constructor Summary

Constructors

Constructor	Description
CastSpecification(Expression arg, Column column)
CastSpecification(Expression arg, TypeInfo type)

Method Summary

Modifier and Type	Method	Description
private static boolean	canOptimizeCast(int src, int dst)
String	getName()	Get the name.
StringBuilder	getUnenclosedSQL(StringBuilder builder, int sqlFlags)	Get the SQL statement of this expression.
Value	getValue(SessionLocal session)	Return the resulting value for the current row.
boolean	isConstant()	Check if this expression will always return the same value.
Expression	optimize(SessionLocal session)	Try to optimize the expression.

Methods inherited from class org.h2.expression.Operation1

getCost, getSubexpression, getSubexpressionCount, getType, isEverything, mapColumns, setEvaluatable, updateAggregate

Methods inherited from class org.h2.expression.Expression

addFilterConditions, createIndexConditions, getAlias, getBooleanValue, getColumnName, getColumnNameForView, getEnclosedSQL, getNonAliasExpression, getNotIfPossible, getNullable, getSchemaName, getSQL, getSQL, getSQL, getSQL, getTableAlias, getTableName, getWhenSQL, getWhenValue, isIdentity, isNullConstant, isValueSet, isWhenConditionOperand, needParentheses, optimizeCondition, toString, writeExpressions, writeExpressions

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.h2.util.HasSQL

getTraceSQL

Field Details

domain

private Domain domain

Constructor Details

CastSpecification

public CastSpecification(Expression arg,
 Column column)

CastSpecification

public CastSpecification(Expression arg,
 TypeInfo type)

Method Details

getValue

public Value getValue(SessionLocal session)

Description copied from class: Expression

Return the resulting value for the current row.

Specified by:

getValue in class Expression

Parameters:

session - the session

Returns:

the result

optimize

public Expression optimize(SessionLocal session)

Description copied from class: Expression

Try to optimize the expression.

Specified by:

optimize in class Expression

Parameters:

session - the session

Returns:

the optimized expression

isConstant

public boolean isConstant()

Description copied from class: Expression

Check if this expression will always return the same value.

Overrides:

isConstant in class Expression

Returns:

if the expression is constant

canOptimizeCast

private static boolean canOptimizeCast(int src,
 int dst)

getUnenclosedSQL

public StringBuilder getUnenclosedSQL(StringBuilder builder,
 int sqlFlags)

Description copied from class: Expression

Get the SQL statement of this expression. This may not always be the original SQL statement, especially after optimization. Enclosing '(' and ')' are never appended.

Overrides:

getUnenclosedSQL in class Function1

Parameters:

builder - string builder

sqlFlags - formatting flags

Returns:

the specified string builder

getName

public String getName()

Description copied from interface: NamedExpression

Get the name.

Returns:

the name in uppercase