condor.classad
Class CondExpr

Object
  condor.classad.Expr
      condor.classad.CondExpr

public class CondExpr

extends Expr

A conditional expression. An internal (non-leaf) node of an expression tree representing the ternary operator cond ? expr1 : expr2.

Version:

2.2

Author:

Marvin Solomon

See Also:

Expr

Field Summary

Expr	ec The condition (first component of the expression).
Expr	ef The false part (third component of the expression).
Expr	et The true part (second component of the expression).

Fields inherited from class condor.classad.Expr

ABSOLUTE_TIME, AND, ATTRIBUTE, BIT_COMPLEMENT, BITAND, BITOR, BITXOR, BOOLEAN, CALL, COND, dblevel, DIFFERENT, DIV, EQUAL, ERROR, GREATER, GREATER_EQ, INTEGER, LEFT_SHIFT, LESS, LESS_EQ, LIST, MAXPREC, MINUS, MOD, NOT, NOT_EQUAL, OP, opName, opNameXML, OR, PLUS, REAL, RECORD, RELATIVE_TIME, RIGHT_SHIFT, SAME, SELECTION, STRING, SUBSCRIPT, TIMES, type, UMINUS, UNDEFINED, UPLUS, URIGHT_SHIFT

Constructor Summary

CondExpr(Expr ec, Expr et, Expr ef)
Construct a conditional expression from its three components.

Method Summary

protected Expr	eval1(Env env) Evaluate this Expr.
int	prec() The precedence of the operator in this expression node.
boolean	sameAs(Expr other) Compare this Expr to another expression to check for "deep structural equality".
StringBuffer	toString(StringBuffer sb) Convert this Expr to a string, appending the result to the end of "sb".

Methods inherited from class condor.classad.Expr

db, db, eval, eval, intValue, is, isConstant, isTrue, realValue, selectExpr, stringValue, subExpr, toString, typeName

Methods inherited from class Object

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

Field Detail

ec

public final Expr ec

The condition (first component of the expression).

et

public final Expr et

The true part (second component of the expression).

ef

public final Expr ef

The false part (third component of the expression).

Constructor Detail

CondExpr

public CondExpr(Expr ec,
                Expr et,
                Expr ef)

Construct a conditional expression from its three components.

Parameters:

ec - the condition (first component of the expression)

et - the true part (second component of the expression)

ef - the false part (third component of the expression)

Method Detail

toString

public StringBuffer toString(StringBuffer sb)

Convert this Expr to a string, appending the result to the end of "sb". The representation is the "canonical native format": '(' condition '?' true-part ':' false-part ')', with no extra spaces.

Specified by:

toString in class Expr

Parameters:

sb - a place to put the result.

Returns:

sb.

See Also:

ClassAdWriter

sameAs

public boolean sameAs(Expr other)

Compare this Expr to another expression to check for "deep structural equality".

Specified by:

sameAs in class Expr

Parameters:

other - the other expression.

Returns:

true of this and the other expression are isomorphic.

prec

public int prec()

The precedence of the operator in this expression node. Used to print expressions without superfluous parentheses.

Specified by:

prec in class Expr

Returns:

the precendence of this node.

See Also:

ClassAdWriter.MINIMAL_PARENTHESES

eval1

protected Expr eval1(Env env)

Evaluate this Expr. This is the internal method used to implement Expr.eval().

Specified by:

eval1 in class Expr

Parameters:

env - an environment used to evaluate the operands. It is cleared to the null environment before return.

Returns:

a Constant representing the value.