RowEvaluator.Decoder (Starjava Table API)

java.lang.Object

uk.ac.starlink.table.formats.RowEvaluator.Decoder<T>

Enclosing class:: RowEvaluator

public abstract static class RowEvaluator.Decoder<T> extends Object

Interface for an object that can turn a string into a cell content object.

Since:: 21 Sep 2004
Author:: Mark Taylor (Starlink)

Constructor Summary

Constructors

Constructor

Description

Decoder(Class<T> clazz, String name)

Constructor.
Method Summary

Modifier and Type

Method

Description

ColumnInfo

createColumnInfo(String name)

Returns a new ColumnInfo suitable for the decoded values.

abstract T

decode(String value)

Decodes a value.

Class<T>

getDecodedClass()

Returns the class to which this decoder decodes.

String

getName()

Returns the name of this decoder.

abstract boolean

isValid(String value)

Indicates whether this decoder is capable of decoding a given string.

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

Constructor Details
- Decoder
  
  public Decoder(Class<T> clazz, String name)
  
  Constructor.
  
  Parameters:
  
  clazz - class of object to be returned by decode method
  
  name - instance name
Method Details
- getDecodedClass
  
  public Class<T> getDecodedClass()
  
  Returns the class to which this decoder decodes.
  
  Returns:
  
  destination class
- getName
  
  public String getName()
  
  Returns the name of this decoder.
  
  Returns:
  
  name
- createColumnInfo
  
  public ColumnInfo createColumnInfo(String name)
  
  Returns a new ColumnInfo suitable for the decoded values.
  
  Parameters:
  
  name - column name
  
  Returns:
  
  new metadata object
- decode
  
  public abstract T decode(String value)
  
  Decodes a value. Will complete without exception if isValid(String) returns true for the presented value; otherwise may throw an unchecked exception.
  
  Parameters:
  
  value - string to decode
  
  Returns:
  
  typed object corresponding to value
- isValid
  
  public abstract boolean isValid(String value)
  
  Indicates whether this decoder is capable of decoding a given string.
  
  Parameters:
  
  value - string to decode
  
  Returns:
  
  true iff this decoder can make sense of the string