uk.ac.starlink.table.formats

Class RowEvaluator.Decoder<T>

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.

Constructor Summary

Constructors

Constructor and Description
Decoder(Class<T> clazz, String name) Constructor.

Method Summary

Modifier and Type	Method and 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 java.lang.Object

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

Constructor Detail

Decoder

public Decoder(Class<T> clazz,
               String name)

Constructor.

Parameters:

clazz - class of object to be returned by decode method

name - instance name

Method Detail

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(java.lang.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