org.datanucleus.store.mapped.expression
Class UnknownLiteral

java.lang.Object
  org.datanucleus.store.mapped.expression.ScalarExpression
      org.datanucleus.store.mapped.expression.NullLiteral
          org.datanucleus.store.mapped.expression.UnknownLiteral

All Implemented Interfaces:

Literal

public class UnknownLiteral
extends NullLiteral

Representation of a unknown literal in a Query. This is a special literal with the sole purpose of representing a parameter where we don't currently have the value and want to pre-compile the query to check for other errors. Simply provides wrappers for operations that we would perform on a parameter value, and returns a valid expression.

Nested Class Summary

Nested classes/interfaces inherited from class org.datanucleus.store.mapped.expression.ScalarExpression

ScalarExpression.DatastoreFieldExpression, ScalarExpression.DyadicOperator, ScalarExpression.ExpressionList, ScalarExpression.IllegalArgumentTypeException, ScalarExpression.IllegalOperationException, ScalarExpression.MethodInvocationException, ScalarExpression.MonadicOperator, ScalarExpression.Operator

Field Summary

Fields inherited from class org.datanucleus.store.mapped.expression.ScalarExpression

aliasIdentifier, checkForTypeAssignability, expressionList, FILTER, LOCALISER, lowestOperator, mapping, OP_ADD, OP_AND, OP_BETWEEN, OP_COM, OP_CONCAT, OP_DIV, OP_EQ, OP_GT, OP_GTEQ, OP_IN, OP_IS, OP_ISNOT, OP_LIKE, OP_LT, OP_LTEQ, OP_MOD, OP_MUL, OP_NEG, OP_NOT, OP_NOTEQ, OP_NOTIN, OP_NOTLIKE, OP_OR, OP_SUB, parameterName, PROJECTION, qs, st, te

Constructor Summary

UnknownLiteral(QueryExpression qs)
Creates an unknown literal.

Method Summary

ScalarExpression	add(ScalarExpression expr) Additive Operator.
BooleanExpression	and(ScalarExpression expr) Conditional And.
ScalarExpression	div(ScalarExpression expr) Division Operator.
BooleanExpression	eq(ScalarExpression expr) Equality operator (equals to)
java.lang.Object	getValue() Accessor to the literal value
BooleanExpression	gt(ScalarExpression expr) Relational operator (greater than)
BooleanExpression	gteq(ScalarExpression expr) Relational operator (greater than or equals)
BooleanExpression	in(ScalarExpression expr) In expression.
BooleanExpression	lt(ScalarExpression expr) Relational operator (lower than)
BooleanExpression	lteq(ScalarExpression expr) Relational operator (lower than or equals)
ScalarExpression	mod(ScalarExpression expr) Remainder Operator.
ScalarExpression	mul(ScalarExpression expr) Multiplication Operator
BooleanExpression	noteq(ScalarExpression expr) Equality operator (not equals to)
ScalarExpression	sub(ScalarExpression expr) Additive Operator.

Methods inherited from class org.datanucleus.store.mapped.expression.NullLiteral

getRawValue, setRawValue

Methods inherited from class org.datanucleus.store.mapped.expression.ScalarExpression

accessField, as, assertValidTypeForParameterComparison, callMethod, cast, checkForTypeAssignability, com, encloseWithInParentheses, eor, equals, getAlias, getConsistentTypeForParameterComparison, getExpressionList, getLogicSetExpression, getMapping, getNonAliasExpression, getQueryExpression, instanceOf, ior, neg, not, setParameterName, toStatementText, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

UnknownLiteral

public UnknownLiteral(QueryExpression qs)

Creates an unknown literal.

Parameters:

qs - the QueryExpression

Method Detail

getValue

public java.lang.Object getValue()

Description copied from interface: Literal

Accessor to the literal value

Specified by:

getValue in interface Literal

Overrides:

getValue in class NullLiteral

Returns:

the value of the literal

add

public ScalarExpression add(ScalarExpression expr)

Description copied from class: ScalarExpression

Additive Operator. The binary + operator performs addition when applied to two operands of numeric type, producing the sum of the operands. If the type of either operand of a + operator is String, then the operation is string concatenation.

Overrides:

add in class NullLiteral

Parameters:

expr - the right-hand operand

Returns:

If one of the operands is String, the returned value is the string concatenation; The sum of two operands of numeric type. The left-hand operand is the minuend and the right-hand operand is the subtrahend;

eq

public BooleanExpression eq(ScalarExpression expr)

Description copied from class: ScalarExpression

Equality operator (equals to)

Overrides:

eq in class NullLiteral

Parameters:

expr - the right-hand operand

Returns:

The type of an equality expression is a boolean

noteq

public BooleanExpression noteq(ScalarExpression expr)

Description copied from class: ScalarExpression

Equality operator (not equals to)

Overrides:

noteq in class NullLiteral

Parameters:

expr - the right-hand operand

Returns:

The type of an equality expression is a boolean

and

public BooleanExpression and(ScalarExpression expr)

Description copied from class: ScalarExpression

Conditional And. Evaluates its right-hand operand only if the value of its left-hand operand is true.

Overrides:

and in class ScalarExpression

Parameters:

expr - the right-hand operand

Returns:

the result value is true if both operand values are true; otherwise, the result is false.

div

public ScalarExpression div(ScalarExpression expr)

Description copied from class: ScalarExpression

Division Operator. The left-hand operand is the dividend and the right-hand operand is the divisor.

Overrides:

div in class ScalarExpression

Parameters:

expr - the right-hand operator

Returns:

The binary / operator performs division, producing the quotient of its operands

gt

public BooleanExpression gt(ScalarExpression expr)

Description copied from class: ScalarExpression

Relational operator (greater than)

Overrides:

gt in class ScalarExpression

Parameters:

expr - the right-hand operand

Returns:

true if the value of the left-hand operand is greater than the value of the right-hand operand, and otherwise is false.

gteq

public BooleanExpression gteq(ScalarExpression expr)

Description copied from class: ScalarExpression

Relational operator (greater than or equals)

Overrides:

gteq in class ScalarExpression

Parameters:

expr - the right-hand operand

Returns:

true if the value of the left-hand operand is greater than or equal the value of the right-hand operand, and otherwise is false.

in

public BooleanExpression in(ScalarExpression expr)

Description copied from class: ScalarExpression

In expression. Return true if this is contained by expr

Overrides:

in in class ScalarExpression

Parameters:

expr - the right-hand expression

Returns:

true if the left-hand expression is contained by the right-hand expression. Otherwise the result is false.

lt

public BooleanExpression lt(ScalarExpression expr)

Description copied from class: ScalarExpression

Relational operator (lower than)

Overrides:

lt in class ScalarExpression

Parameters:

expr - the right-hand operand

Returns:

true if the value of the left-hand operand is less than the value of the right-hand operand, and otherwise is false.

lteq

public BooleanExpression lteq(ScalarExpression expr)

Description copied from class: ScalarExpression

Relational operator (lower than or equals)

Overrides:

lteq in class ScalarExpression

Parameters:

expr - the right-hand operand

Returns:

true if the value of the left-hand operand is less than or equal to the value of the right-hand operand, and otherwise is false.

mod

public ScalarExpression mod(ScalarExpression expr)

Description copied from class: ScalarExpression

Remainder Operator. The left-hand operand is the dividend and the right-hand operand is the divisor.

Overrides:

mod in class ScalarExpression

Parameters:

expr - the right-hand operator

Returns:

The binary % operator is said to yield the remainder of its operands from an implied division

mul

public ScalarExpression mul(ScalarExpression expr)

Description copied from class: ScalarExpression

Multiplication Operator

Overrides:

mul in class ScalarExpression

Parameters:

expr - the right-hand operator

Returns:

The binary * operator performs multiplication, producing the product of its operands.

sub

public ScalarExpression sub(ScalarExpression expr)

Description copied from class: ScalarExpression

Additive Operator. The binary - operator subtracts right-hand operand from left-hand operand.

Overrides:

sub in class ScalarExpression

Parameters:

expr - the right-hand operand

Returns:

The binary - operator performs subtraction when applied to two operands of numeric type producing the difference of its operands; the left-hand operand is the minuend and the right-hand operand is the subtrahend.