org.datanucleus.store.rdbms.sql.expression
Class DelegatedExpression

java.lang.Object
  org.datanucleus.store.rdbms.sql.expression.SQLExpression
      org.datanucleus.store.rdbms.sql.expression.DelegatedExpression

Direct Known Subclasses:

EnumExpression, StringNumericExpression, StringTemporalExpression

public abstract class DelegatedExpression
extends SQLExpression

Expression for a field/property that can delegate to an internal expression(s).

Nested Class Summary

Nested classes/interfaces inherited from class org.datanucleus.store.rdbms.sql.expression.SQLExpression

SQLExpression.ColumnExpressionList

Field Summary

protected SQLExpression

delegate The delegate expression that we use.

Fields inherited from class org.datanucleus.store.rdbms.sql.expression.SQLExpression

LOCALISER, lowestOperator, mapping, parameterName, st, stmt, subExprs, table

Constructor Summary

DelegatedExpression(SQLStatement stmt, SQLTable table, org.datanucleus.store.mapped.mapping.JavaTypeMapping mapping)

Method Summary

SQLExpression	add(SQLExpression expr) Additive Operator.
SQLExpression	div(SQLExpression expr) Division Operator.
BooleanExpression	eq(SQLExpression expr) Equality operator (equals to)
BooleanExpression	ge(SQLExpression expr) Relational operator (greater than or equals)
SQLExpression	getDelegate() Accessor for the delegate that represents this enum.
BooleanExpression	gt(SQLExpression expr) Relational operator (greater than)
SQLExpression	invoke(String methodName, List args) Invocation of a method on this expression.
BooleanExpression	le(SQLExpression expr) Relational operator (lower than or equals)
BooleanExpression	lt(SQLExpression expr) Relational operator (lower than)
SQLExpression	mod(SQLExpression expr) Remainder Operator.
SQLExpression	mul(SQLExpression expr) Multiplication Operator
BooleanExpression	ne(SQLExpression expr) Not equality operator (not equals to)
SQLExpression	sub(SQLExpression expr) Additive Operator.
SQLText	toSQLText() Method to return the SQL form of this expression.

Methods inherited from class org.datanucleus.store.rdbms.sql.expression.SQLExpression

and, cast, com, distinct, encloseInParentheses, eor, getJavaTypeMapping, getLowestOperator, getNumberOfSubExpressions, getParameterName, getSQLStatement, getSQLTable, getSubExpression, in, ior, is, isParameter, neg, not, setJavaTypeMapping

Methods inherited from class java.lang.Object

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

Field Detail

delegate

protected SQLExpression delegate

The delegate expression that we use. MUST BE SET ON CONSTRUCTION.

Constructor Detail

DelegatedExpression

public DelegatedExpression(SQLStatement stmt,
                           SQLTable table,
                           org.datanucleus.store.mapped.mapping.JavaTypeMapping mapping)

Method Detail

eq

public BooleanExpression eq(SQLExpression expr)

Description copied from class: SQLExpression

Equality operator (equals to)

Overrides:

eq in class SQLExpression

Parameters:

expr - the right-hand operand

Returns:

The type of an equality expression is a boolean

ne

public BooleanExpression ne(SQLExpression expr)

Description copied from class: SQLExpression

Not equality operator (not equals to)

Overrides:

ne in class SQLExpression

Parameters:

expr - the right-hand operand

Returns:

The type of an equality expression is a boolean

add

public SQLExpression add(SQLExpression expr)

Description copied from class: SQLExpression

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 SQLExpression

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;

div

public SQLExpression div(SQLExpression expr)

Description copied from class: SQLExpression

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

Overrides:

div in class SQLExpression

Parameters:

expr - the right-hand operator

Returns:

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

ge

public BooleanExpression ge(SQLExpression expr)

Description copied from class: SQLExpression

Relational operator (greater than or equals)

Overrides:

ge in class SQLExpression

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.

gt

public BooleanExpression gt(SQLExpression expr)

Description copied from class: SQLExpression

Relational operator (greater than)

Overrides:

gt in class SQLExpression

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.

le

public BooleanExpression le(SQLExpression expr)

Description copied from class: SQLExpression

Relational operator (lower than or equals)

Overrides:

le in class SQLExpression

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.

lt

public BooleanExpression lt(SQLExpression expr)

Description copied from class: SQLExpression

Relational operator (lower than)

Overrides:

lt in class SQLExpression

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.

mod

public SQLExpression mod(SQLExpression expr)

Description copied from class: SQLExpression

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

Overrides:

mod in class SQLExpression

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 SQLExpression mul(SQLExpression expr)

Description copied from class: SQLExpression

Multiplication Operator

Overrides:

mul in class SQLExpression

Parameters:

expr - the right-hand operator

Returns:

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

sub

public SQLExpression sub(SQLExpression expr)

Description copied from class: SQLExpression

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

Overrides:

sub in class SQLExpression

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.

invoke

public SQLExpression invoke(String methodName,
                            List args)

Description copied from class: SQLExpression

Invocation of a method on this expression.

Overrides:

invoke in class SQLExpression

Parameters:

methodName - name of the method to invoke

args - Args to this method (if any)

Returns:

the converted value

toSQLText

public SQLText toSQLText()

Description copied from class: SQLExpression

Method to return the SQL form of this expression.

Overrides:

toSQLText in class SQLExpression

Returns:

The SQL

getDelegate

public SQLExpression getDelegate()

Accessor for the delegate that represents this enum. Will be either a StringExpression or a NumericExpression depending whether the enum is stored as a string or as a numeric.

Returns:

The delegate