condor.classad
Class SelectExpr

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

public class SelectExpr

extends Expr

An internal (non-leaf) node of an expression tree, representing a selection of component of a record. It has the form from a class ad in the form

    <expr> . <identifier>.
 

Version:

1.2

Author:

Marvin Solomon

See Also:

Expr

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

SelectExpr(Expr base, condor.classad.CiString selector)
Create a new SelectExpr corresponding to base.selector.

SelectExpr(Expr base, String selector)
Create a new SelectExpr corresponding to base.selector.

Method Summary

protected int	prec() The precedence of the operator in this expression node.
protected Expr	reEval(Context ctx) Evalutate this expression.
static Expr	select(Expr base, String[] sel) A convenience function for creating a SelectExpression corresponding to "base.a.b.c"
String	toString() Convert this Expr to a string.
protected String	typeName() The type of the expression.

Methods inherited from class condor.classad.Expr

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

Methods inherited from class java.lang.Object

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

Constructor Detail

SelectExpr

public SelectExpr(Expr base,
                  String selector)

Create a new SelectExpr corresponding to base.selector.

Parameters:

base - the left argument (base expression).

selector - the right argument (identifier).

SelectExpr

public SelectExpr(Expr base,
                  condor.classad.CiString selector)

Create a new SelectExpr corresponding to base.selector.

Parameters:

base - the left argument (base expression).

selector - the right argument (identifier).

Method Detail

select

public static Expr select(Expr base,
                          String[] sel)

A convenience function for creating a SelectExpression corresponding to "base.a.b.c"

Parameters:

base - the base Expr.

sel - the sequence of selectors {"a", "b", "c"}

Returns:

a new SelectExpr or base if sel is empty.

typeName

protected String typeName()

The type of the expression. This should never be called!

Overrides:

typeName in class Expr

Returns:

the string "selection".

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)