condor.classad
Class Op

java.lang.Object
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  +--condor.classad.Expr
        |
        +--condor.classad.Op

public class Op

extends Expr

A unary or binary expression. An internal (non-leaf) node of an expression tree representing a unary or binary operator applied to one or two operands.

Version:

1.2

Author:

Marvin Solomon

See Also:

Expr

Field Summary

Expr	arg1 The first (or only) operand.
Expr	arg2 The second operand; null if the operator is unary.
int	op The top-level operator.

Fields inherited from class condor.classad.Expr

ABSOLUTE_TIME, AND, ATTRIBUTE, BIT_COMPLEMENT, BITAND, BITOR, BITXOR, BOOLEAN, BRIEF, CALL, COMPACT, COND, dblevel, DIFFERENT, DIV, EQUAL, ERROR, formatFlags, formatIndent, GREATER, GREATER_EQ, INTEGER, LEFT_SHIFT, LESS, LESS_EQ, LIST, MAXPREC, MINIMAL_PARENTHESES, MINUS, MOD, MULTI_LINE_ADS, MULTI_LINE_LISTS, NO_ESCAPE_STRINGS, NOT, NOT_EQUAL, OP, opName, OR, PLUS, READABLE, REAL, RECORD, RELATIVE_TIME, RIGHT_SHIFT, SAME, SELECTION, SHOW_ERROR_DETAIL, SHOW_INSTANCES, STRING, SUBSCRIPT, TIMES, type, UMINUS, UNDEFINED, UPLUS, URIGHT_SHIFT

Constructor Summary

Op(int op, Expr arg1)
Construct a node for a unary operator.

Op(int op, Expr arg1, Expr arg2)
Construct a node for a binary operator.

Method Summary

protected int	prec() The precedence of the operator in this expression node.
protected Expr	reEval(Context ctx) Evalutate this expression.
String	toString() Convert this Expr to a string.

Methods inherited from class condor.classad.Expr

db, db, disableFormatFlags, enableFormatFlags, eval, getFormatFlags, isConstant, isNormalForm, mark, mark, mark, select, setFormatFlags, toString, typeName

Methods inherited from class java.lang.Object

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

Field Detail

op

public final int op

The top-level operator.

See Also:

Expr.opName

arg1

public final Expr arg1

The first (or only) operand.

arg2

public final Expr arg2

The second operand; null if the operator is unary.

Constructor Detail

Op

public Op(int op,
          Expr arg1,
          Expr arg2)

Construct a node for a binary operator.

Parameters:

op - the operator.

arg1 - the left operand.

arg2 - the right operand.

Op

public Op(int op,
          Expr arg1)

Construct a node for a unary operator.

Parameters:

op - the operator.

arg1 - the operand.

Method Detail

toString

public String toString()

Convert this Expr to a string. The exact format of the result is controled by the static fields Expr.formatFlags and Expr.formatIndent. The result may be multiple lines long (it may include embedded newlines and tabs), but it never ends with a newline.

Overrides:

toString in class Expr

Returns:

a string representation of the this Context

See Also:

Expr.formatFlags, Expr.formatIndent

prec

protected int prec()

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

Overrides:

prec in class Expr

Returns:

the precendence of this node.

See Also:

Expr.MINIMAL_PARENTHESES

reEval

protected Expr reEval(Context ctx)

Evalutate this expression.

Overrides:

reEval in class Expr

Parameters:

ctx - an evaluation context for evaluating this expression

Returns:

a Constant, ListExpr, or RecordExpr representing the value.

See Also:

Expr.eval(condor.classad.Context)