net.sf.saffron.sql
Class SqlOperatorTable

java.lang.Object
  |
  +--net.sf.saffron.sql.SqlOperatorTable

Direct Known Subclasses:

RexOperatorTable

public class SqlOperatorTable

extends Object

SqlOperatorTable is a singleton which contains an instance of each operator.

Field Summary

SqlBinaryOperator	andOperator
SqlBinaryOperator	asOperator
static SqlOperator.TypeInference	booleanType Type-inference strategy whereby the result type of a call is Boolean.
SqlFunction	cast The SQL CAST operator.
SqlBinaryOperator	concatOperator
SqlSpecialOperator	deleteOperator
SqlPostfixOperator	descendingOperator
SqlBinaryOperator	divideOperator
SqlBinaryOperator	dotOperator
SqlBinaryOperator	equalsOperator
SqlBinaryOperator	exceptOperator
SqlPrefixOperator	existsOperator
SqlSpecialOperator	explainOperator
SqlBinaryOperator	greaterThanOperator
SqlBinaryOperator	greaterThanOrEqualOperator
SqlBinaryOperator	inOperator
SqlSpecialOperator	insertOperator
private static SqlOperatorTable	instance
SqlBinaryOperator	intersectOperator
SqlPostfixOperator	isNotNullOperator
SqlPostfixOperator	isNullOperator
SqlJoinOperator	joinOperator
SqlBinaryOperator	lessThanOperator
SqlBinaryOperator	lessThanOrEqualOperator
private HashMap	mapNameToOp
SqlBinaryOperator	minusOperator
SqlBinaryOperator	multiplyOperator
SqlBinaryOperator	notEqualsOperator
SqlPrefixOperator	notOperator
private MultiMap	operators
SqlBinaryOperator	orOperator
SqlBinaryOperator	plusOperator
SqlPrefixOperator	prefixMinusOperator
SqlPrefixOperator	prefixPlusOperator
SqlFunction	rowConstructor
SqlSelectOperator	selectOperator
SqlFunction	substringFunction
SqlBinaryOperator	unionOperator
static SqlOperator.TypeInference	useFirstArgType Type-inference strategy whereby the result type of a call is the type of the first operand.
static SqlOperator.TypeInference	useScope Type-inference strategy where the expression is assumed to be registered as a SqlValidator.Scope, and therefore the result type of the call is the type of that scope.
SqlPrefixOperator	valuesOperator

Constructor Summary

protected

SqlOperatorTable()

Method Summary

static SqlOperatorTable	instance() Retrieves the singleton, creating it if necessary.
SqlOperator	lookup(SqlKind kind) Retrieves an operator by its id.
SqlOperator	lookup(String opName, int syntax) Retrieves an operator by its name and syntactic type.
void	register(SqlOperator op)
SqlNode	toTree(List list) Converts a list of {expression, operator, expression, ...} into a tree, taking operator precedence and associativity into account.

Methods inherited from class java.lang.Object

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

Field Detail

instance

private static SqlOperatorTable instance

useFirstArgType

public static final SqlOperator.TypeInference useFirstArgType

Type-inference strategy whereby the result type of a call is the type of the first operand.

booleanType

public static final SqlOperator.TypeInference booleanType

Type-inference strategy whereby the result type of a call is Boolean.

useScope

public static final SqlOperator.TypeInference useScope

Type-inference strategy where the expression is assumed to be registered as a SqlValidator.Scope, and therefore the result type of the call is the type of that scope.

andOperator

public final SqlBinaryOperator andOperator

asOperator

public final SqlBinaryOperator asOperator

concatOperator

public final SqlBinaryOperator concatOperator

divideOperator

public final SqlBinaryOperator divideOperator

dotOperator

public final SqlBinaryOperator dotOperator

equalsOperator

public final SqlBinaryOperator equalsOperator

exceptOperator

public final SqlBinaryOperator exceptOperator

greaterThanOperator

public final SqlBinaryOperator greaterThanOperator

greaterThanOrEqualOperator

public final SqlBinaryOperator greaterThanOrEqualOperator

inOperator

public final SqlBinaryOperator inOperator

intersectOperator

public final SqlBinaryOperator intersectOperator

lessThanOperator

public final SqlBinaryOperator lessThanOperator

lessThanOrEqualOperator

public final SqlBinaryOperator lessThanOrEqualOperator

minusOperator

public final SqlBinaryOperator minusOperator

multiplyOperator

public final SqlBinaryOperator multiplyOperator

notEqualsOperator

public final SqlBinaryOperator notEqualsOperator

orOperator

public final SqlBinaryOperator orOperator

plusOperator

public final SqlBinaryOperator plusOperator

unionOperator

public final SqlBinaryOperator unionOperator

substringFunction

public final SqlFunction substringFunction

rowConstructor

public final SqlFunction rowConstructor

cast

public final SqlFunction cast

The SQL CAST operator.

The target type is simply stored as the return type, not an explicit operand. For example, the expression CAST(1 + 2 AS DOUBLE) will become a call to CAST with the expression 1 + 2 as its only operand.

descendingOperator

public final SqlPostfixOperator descendingOperator

isNotNullOperator

public final SqlPostfixOperator isNotNullOperator

isNullOperator

public final SqlPostfixOperator isNullOperator

existsOperator

public final SqlPrefixOperator existsOperator

notOperator

public final SqlPrefixOperator notOperator

prefixMinusOperator

public final SqlPrefixOperator prefixMinusOperator

prefixPlusOperator

public final SqlPrefixOperator prefixPlusOperator

valuesOperator

public final SqlPrefixOperator valuesOperator

selectOperator

public final SqlSelectOperator selectOperator

joinOperator

public final SqlJoinOperator joinOperator

insertOperator

public final SqlSpecialOperator insertOperator

deleteOperator

public final SqlSpecialOperator deleteOperator

explainOperator

public final SqlSpecialOperator explainOperator

operators

private final MultiMap operators

mapNameToOp

private final HashMap mapNameToOp

Constructor Detail

SqlOperatorTable

protected SqlOperatorTable()

Method Detail

instance

public static SqlOperatorTable instance()

Retrieves the singleton, creating it if necessary.

lookup

public SqlOperator lookup(String opName,
                          int syntax)

Retrieves an operator by its name and syntactic type.

register

public void register(SqlOperator op)

toTree

public SqlNode toTree(List list)

Converts a list of {expression, operator, expression, ...} into a tree, taking operator precedence and associativity into account.

Pre-condition:

list.size() % 2 == 1

lookup

public SqlOperator lookup(SqlKind kind)

Retrieves an operator by its id.