Package org.datanucleus.store.query.expression

Class DyadicExpression

java.lang.Object

org.datanucleus.store.query.expression.Expression

org.datanucleus.store.query.expression.DyadicExpression

All Implemented Interfaces:

java.io.Serializable

public class DyadicExpression
extends Expression

Expression between two other expressions and an operation. For example, "this.myField < myValue" will become left = PrimaryExpression, right = Literal, op = Expression.OP_LT. A special case is where we have an expression like "!(condition)". In this case we become left = expression, right = null, op = Expression.OP_NOT.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.datanucleus.store.query.expression.Expression

Expression.DyadicOperator, Expression.MonadicOperator, Expression.Operator

Field Summary

Fields

Modifier and Type	Field	Description
private static long	serialVersionUID

Fields inherited from class org.datanucleus.store.query.expression.Expression

alias, left, op, OP_ADD, OP_AND, OP_BIT_AND, OP_BIT_OR, OP_BIT_XOR, OP_CAST, OP_COM, OP_CONCAT, OP_DISTINCT, 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_OR, OP_SUB, parent, right, symbol

Constructor Summary

Constructors

Constructor	Description
DyadicExpression(Expression.MonadicOperator op, Expression operand)	Perform a function op on operand
DyadicExpression(Expression operand1, Expression.DyadicOperator op, Expression operand2)	Performs a function on two arguments.

Method Summary

Modifier and Type	Method	Description
Symbol	bind(SymbolTable symtbl)	Method to bind the expression to the symbol table as appropriate.
java.lang.Object	evaluate(ExpressionEvaluator eval)	Method to evaluate this expression, using the passed evaluator.
java.lang.String	toString()

Methods inherited from class org.datanucleus.store.query.expression.Expression

getAlias, getLeft, getOperator, getParent, getRight, getSymbol, setAlias, setLeft, setRight

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

Constructor Detail

DyadicExpression

public DyadicExpression(Expression.MonadicOperator op,
                        Expression operand)

Perform a function op on operand

Parameters:

op - operator

operand - operand

DyadicExpression

public DyadicExpression(Expression operand1,
                        Expression.DyadicOperator op,
                        Expression operand2)

Performs a function on two arguments. op(operand1,operand2) operand1 op operand2

Parameters:

operand1 - the first expression

op - the operator between operands

operand2 - the second expression

Method Detail

evaluate

public java.lang.Object evaluate(ExpressionEvaluator eval)

Method to evaluate this expression, using the passed evaluator.

Overrides:

evaluate in class Expression

Parameters:

eval - Evaluator

Returns:

The result

bind

public Symbol bind(SymbolTable symtbl)

Method to bind the expression to the symbol table as appropriate.

Specified by:

bind in class Expression

Parameters:

symtbl - Symbol table

Returns:

The symbol for this expression

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object