AsciiStarTable (Starjava Table API)

java.lang.Object
- uk.ac.starlink.table.AbstractStarTable
- - uk.ac.starlink.table.formats.StreamStarTable
  - - uk.ac.starlink.table.formats.AsciiStarTable

All Implemented Interfaces:

StarTable
```
public class AsciiStarTable
extends StreamStarTable
```
Simple ASCII-format table. This reader attempts to make sensible decisions about what is a table and what is not, but inevitably it will not be able to read ASCII tables in any format.
Here are the rules:
- Bytes in the file are interpreted as ASCII characters
- Each table row is represented by a single line of text
- Lines are terminated by one or more contiguous line termination characters: line feed (0x0A) or carriage return (0x0D)
- Within a line, fields are separated by one or more whitespace characters: space (" ") or tab (0x09)
- A field is either an unquoted sequence of non-whitespace characters, or a sequence of non-newline characters between matching single (') or double (") quote characters - spaces are therefore allowed in quoted fields
- Within a quoted field, whitespace characters are permitted and are treated literally
- Within a quoted field, any character preceded by a backslash character ("\") is treated literally. This allows quote characters to appear within a quoted string.
- An empty quoted string (two adjacent quotes) or the string "null" (unquoted) represents the null value
- All data lines must contain the same number of fields (this is the number of columns in the table)
- The data type of a column is guessed according to the fields that appear in the table. If all the fields in one column can be parsed as integers (or null values), then that column will turn into an integer-type column. The types that are tried, in order of preference, are: Boolean, Short Integer, Long, Float, Double, String
- Empty lines are ignored
- Anything after a hash character "#" (except one in a quoted string) on a line is ignored as far as table data goes; any line which starts with a "!" is also ignored. However, lines which start with a "#" or "!" at the start of the table (before any data lines) will be interpreted as metadata as follows:
  - The last "#"/"!"-starting line before the first data line may contain the column names. If it has the same number of fields as there are columns in the table, each field will be taken to be the title of the corresponding column. Otherwise, it will be taken as a normal comment line.
  - Any comment lines before the first data line not covered by the above will be concatenated to form the "description" parameter of the table.
Author:

Mark Taylor (Starlink)

Field Summary
- Fields inherited from class uk.ac.starlink.table.formats.StreamStarTable
  END

Constructor Summary

Constructors
Constructor Description

AsciiStarTable(uk.ac.starlink.util.DataSource datsrc)
Constructs a new AsciiStarTable from a datasource.

Constructors
Constructor	Description
`AsciiStarTable(uk.ac.starlink.util.DataSource datsrc)`	Constructs a new AsciiStarTable from a datasource.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected RowEvaluator.Metadata`	`obtainMetadata()`	Obtains column metadata for this table, probably by reading through the rows once and using a RowEvaluator.
`protected java.util.List`	`readRow(java.io.PushbackInputStream in)`	Reads the next row of data from a given stream.

Methods inherited from class uk.ac.starlink.table.AbstractStarTable
checkedLongToInt, getCell, getColumnAuxDataInfos, getName, getParameterByName, getParameters, getRow, getURL, isRandom, setName, setParameter, setParameters, setURL

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from class uk.ac.starlink.table.formats.StreamStarTable
getColumnCount, getColumnInfo, getInputStream, getRowCount, getRowSequence, init

- Constructor Detail
  - AsciiStarTable
```
public AsciiStarTable(uk.ac.starlink.util.DataSource datsrc)
               throws TableFormatException,
                      java.io.IOException
```
    Constructs a new AsciiStarTable from a datasource.
    
    Parameters:
    
    datsrc - the data source containing the table text
    
    Throws:
    
    TableFormatException - if the input stream doesn't appear to form a ASCII-format table
    
    java.io.IOException - if some I/O error occurs
- Method Detail
  - obtainMetadata
```
protected RowEvaluator.Metadata obtainMetadata()
                                        throws TableFormatException,
                                               java.io.IOException
```
    Description copied from class: StreamStarTable
    
    Obtains column metadata for this table, probably by reading through the rows once and using a RowEvaluator.
    
    Specified by:
    
    obtainMetadata in class StreamStarTable
    
    Returns:
    
    information about the table represented by the character stream
    
    Throws:
    
    TableFormatException - if the data doesn't represent this kind of table
    
    java.io.IOException - if I/O error is encountered
  - readRow
```
protected java.util.List readRow(java.io.PushbackInputStream in)
                          throws java.io.IOException
```
    Reads the next row of data from a given stream. Ignorable rows are skipped; comments may be stashed away.
    
    Specified by:
    
    readRow in class StreamStarTable
    
    Parameters:
    
    in - input stream
    
    Returns:
    
    list of Strings one for each cell in the row, or null for end of stream
    
    Throws:
    
    TableFormatException - if the data doesn't represent this kind of table
    
    java.io.IOException - if I/O error is encountered

Class AsciiStarTable

Field Summary

Fields inherited from class uk.ac.starlink.table.formats.StreamStarTable

Constructor Summary

Method Summary

Methods inherited from class uk.ac.starlink.table.AbstractStarTable

Methods inherited from class java.lang.Object

Methods inherited from class uk.ac.starlink.table.formats.StreamStarTable

Constructor Detail

AsciiStarTable

Method Detail

obtainMetadata

readRow