condor.classad
Class ListExpr

Object
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  +--condor.classad.Expr
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        +--condor.classad.ListExpr

public class ListExpr

extends Expr

A list of expressions. An internal (non-leaf) node of an expression tree representing the list-construction operator { expr, expr, ... }.

Version:

2.0

Author:

Marvin Solomon

See Also:

Expr

Nested Class Summary

Nested classes inherited from class condor.classad.Expr

Expr.Env

Field Summary

Fields inherited from class condor.classad.Expr

ABSOLUTE_TIME, AND, ATTRIBUTE, BIT_COMPLEMENT, BITAND, BITOR, BITXOR, BOOLEAN, CALL, COND, dateAndTimeFormat, dateFormat, 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

ListExpr()
Construct an empty list.

ListExpr(List l)
Construct a list from a list of expressions.

Method Summary

Expr	add(Expr e) Appends the specified Expr to the end of this list.
protected Expr	eval1(Expr.Env env) Evaluate this Expr.
Iterator	iterator() Get an iterator for iterating throught the members of this list.
int	prec() The precedence of the operator in this expression node.
int	size() Get the length of this list.
Expr	sub(int i) Get a member of this list.
StringBuffer	toString(StringBuffer sb) Convert this Expr to a string, appending the result to the end of "sb".
protected String	typeName() Get the type of the expression.

Methods inherited from class condor.classad.Expr

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

Methods inherited from class Object

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

Constructor Detail

ListExpr

public ListExpr()

Construct an empty list.

ListExpr

public ListExpr(List l)

Construct a list from a list of expressions.

Method Detail

size

public int size()

Get the length of this list.

Returns:

the number of elements in this list

sub

public Expr sub(int i)

Get a member of this list.

Parameters:

i - the member to be retrieved.

Returns:

the ith member of this list, or an error Constant if i is out of bounds.

add

public Expr add(Expr e)

Appends the specified Expr to the end of this list.

Parameters:

e - the Expr to add.

Returns:

this ListExpr.

iterator

public Iterator iterator()

Get an iterator for iterating throught the members of this list.

Returns:

an iterator for enumerating the Expr members of this list.

typeName

protected String typeName()

Get the type of the expression.

Overrides:

typeName in class Expr

Returns:

the string "list".

eval1

protected Expr eval1(Expr.Env env)

Evaluate this Expr. This is the internal method used to implement Expr.eval(). A List evaluates to itself.

Specified by:

eval1 in class Expr

Parameters:

env - ignored.

Returns:

this ListExpr.

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".

Specified by:

toString in class Expr

Parameters:

sb - a place to put the result.

Returns:

sb.

See Also:

ClassAdWriter

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