org.eigenbase.sql
Class SqlNumericLiteral

java.lang.Object
  org.eigenbase.sql.SqlNode
      org.eigenbase.sql.SqlLiteral
          org.eigenbase.sql.SqlNumericLiteral

All Implemented Interfaces:

Cloneable

public class SqlNumericLiteral
extends SqlLiteral

A numeric SQL literal.

Since:

Nov 18, 2004

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/SqlNumericLiteral.java#16 $

Author:

jhyde

Nested Class Summary

Nested classes/interfaces inherited from class org.eigenbase.sql.SqlLiteral

SqlLiteral.SqlSymbol

Field Summary

private boolean	isExact
private Integer	prec
private Integer	scale

Fields inherited from class org.eigenbase.sql.SqlLiteral

value

Fields inherited from class org.eigenbase.sql.SqlNode

emptyArray

Constructor Summary

protected

SqlNumericLiteral(BigDecimal value, Integer prec, Integer scale, boolean isExact, SqlParserPos pos)

Method Summary

SqlNode	clone(SqlParserPos pos) Clones a SqlNode with a different position.
RelDataType	createSqlType(RelDataTypeFactory typeFactory)
Integer	getPrec()
Integer	getScale()
boolean	isExact()
boolean	isInteger()
String	toValue() For calc program builder - value may be different than SqlLiteral.unparse(org.eigenbase.sql.SqlWriter, int, int) Typical values: Hello, world! 12.34 {null} 1969-04-29
void	unparse(SqlWriter writer, int leftPrec, int rightPrec) Writes a SQL representation of this node to a writer.

Methods inherited from class org.eigenbase.sql.SqlLiteral

accept, bigDecimalValue, booleanValue, createApproxNumeric, createBinaryString, createBinaryString, createBoolean, createCharString, createCharString, createDate, createExactNumeric, createInterval, createNegative, createNull, createSample, createSymbol, createTime, createTimestamp, createUnknown, equals, equalsDeep, getKind, getMonotonicity, getStringValue, getTypeName, getValue, hashCode, intValue, longValue, sampleValue, stringValue, symbolValue, unescapeUnicode, validate, valueMatchesType

Methods inherited from class org.eigenbase.sql.SqlNode

clone, cloneArray, equalDeep, findValidOptions, getParserPosition, isA, toSqlString, toSqlString, toString, validateExpr

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

prec

private Integer prec

scale

private Integer scale

isExact

private boolean isExact

Constructor Detail

SqlNumericLiteral

protected SqlNumericLiteral(BigDecimal value,
                            Integer prec,
                            Integer scale,
                            boolean isExact,
                            SqlParserPos pos)

Method Detail

getPrec

public Integer getPrec()

getScale

public Integer getScale()

isExact

public boolean isExact()

clone

public SqlNode clone(SqlParserPos pos)

Description copied from class: SqlNode

Clones a SqlNode with a different position.

Overrides:

clone in class SqlLiteral

unparse

public void unparse(SqlWriter writer,
                    int leftPrec,
                    int rightPrec)

Description copied from class: SqlNode

Writes a SQL representation of this node to a writer.

The leftPrec and rightPrec parameters give us enough context to decide whether we need to enclose the expression in parentheses. For example, we need parentheses around "2 + 3" if preceded by "5 *". This is because the precedence of the "*" operator is greater than the precedence of the "+" operator.

The algorithm handles left- and right-associative operators by giving them slightly different left- and right-precedence.

If SqlWriter.isAlwaysUseParentheses() is true, we use parentheses even when they are not required by the precedence rules.

For the details of this algorithm, see SqlCall.unparse(org.eigenbase.sql.SqlWriter, int, int).

Overrides:

unparse in class SqlLiteral

Parameters:

writer - Target writer

leftPrec - The precedence of the SqlNode immediately preceding this node in a depth-first scan of the parse tree

rightPrec - The precedence of the SqlNode immediately

toValue

public String toValue()

Description copied from class: SqlLiteral

For calc program builder - value may be different than SqlLiteral.unparse(org.eigenbase.sql.SqlWriter, int, int) Typical values:

• Hello, world!
• 12.34
• {null}
• 1969-04-29

Overrides:

toValue in class SqlLiteral

Returns:

string representation of the value

createSqlType

public RelDataType createSqlType(RelDataTypeFactory typeFactory)

Overrides:

createSqlType in class SqlLiteral

isInteger

public boolean isInteger()