org.datanucleus.query.expression
Class DyadicExpression

java.lang.Object
  org.datanucleus.query.expression.Expression
      org.datanucleus.query.expression.DyadicExpression

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.

Nested Class Summary

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

Expression.DyadicOperator, Expression.MonadicOperator, Expression.Operator

Field Summary

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

left, LOCALISER, lowestOperator, op, OP_ADD, OP_AND, OP_BETWEEN, 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_OR, OP_SUB, right, symbol

Constructor Summary

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

Symbol	bind()
java.lang.Object	evaluate(ExpressionEvaluator eval)
java.lang.String	toString()

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

getLeft, getOperator, getRight, getSymbol

Methods inherited from class java.lang.Object

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

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)

Specified by:

evaluate in class Expression

bind

public Symbol bind()

Specified by:

bind in class Expression

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object