ucar.nc2

Class ParsedSectionSpec

java.lang.Object

ucar.nc2.ParsedSectionSpec

public class ParsedSectionSpec
extends Object

A String expression for denoting a section of a Variable to be read. Allows nesting for subsetting of Structure member variables.

Since:

May 8, 2008

See Also:

SectionSpecification

Field Summary

Fields

Modifier and Type	Field and Description
ParsedSectionSpec	child
Section	section
Variable	v

Constructor Summary

Constructors

Constructor and Description
ParsedSectionSpec() Public simple constructor
ParsedSectionSpec(Variable v, Section section)

Method Summary

Modifier and Type	Method and Description
static String	makeSectionSpecString(Variable v, List<Range> ranges) Make section specification String from a range list for a Variable.
static ParsedSectionSpec	parseVariableSection(NetcdfFile ncfile, String variableSection) Parse a section specification String.
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

v

public Variable v

section

public Section section

child

public ParsedSectionSpec child

Constructor Detail

ParsedSectionSpec

public ParsedSectionSpec(Variable v,
                         Section section)

ParsedSectionSpec

public ParsedSectionSpec()

Public simple constructor

Method Detail

parseVariableSection

public static ParsedSectionSpec parseVariableSection(NetcdfFile ncfile,
                                                     String variableSection)
                                              throws InvalidRangeException

Parse a section specification String. These have the form:

  section specification := selector | selector '.' selector
  selector := varName ['(' dims ')']
  varName := ESCAPED_STRING
 

   dims := dim | dim, dims
   dim := ':' | slice | start ':' end | start ':' end ':' stride
   slice := INTEGER
   start := INTEGER
   stride := INTEGER
   end := INTEGER
   ESCAPED_STRING : must escape characters = ".("
 

Nonterminals are in lower case, terminals are in upper case, literals are in single quotes. Optional components are enclosed between square braces '[' and ']'.

Parameters:

ncfile - look for variable in here

variableSection - the string to parse, eg "record(12).wind(1:20,:,3)"

Returns:

return ParsedSectionSpec, parsed representation of the variableSection String

Throws:

IllegalArgumentException - when token is misformed, or variable name doesnt exist in ncfile

InvalidRangeException - if section does not match variable shape

makeSectionSpecString

public static String makeSectionSpecString(Variable v,
                                           List<Range> ranges)

Make section specification String from a range list for a Variable.

Parameters:

v - for this Variable.

ranges - list of Range. Must includes all parent structures. The list be null, meaning use all. Individual ranges may be null, meaning all for that dimension.

Returns:

section specification String.

toString

public String toString()

Overrides:

toString in class Object