edu.cmu.cs.cs214.hw5.columns

Class StringColumn

java.lang.Object

edu.cmu.cs.cs214.hw5.columns.AbstractColumn<java.lang.String>

edu.cmu.cs.cs214.hw5.columns.StringColumn

All Implemented Interfaces:

ColumnSpecification

public class StringColumn
extends AbstractColumn<java.lang.String>

Constructor Summary

Constructors

Constructor and Description
StringColumn(java.lang.String name) Create a new string column with the given name.

Method Summary

Modifier and Type	Method and Description
java.lang.String	getTypeName() Get a human-readable name of this type of column specification.
protected java.util.Optional<java.lang.String>	parse(java.lang.String s) Attempt to parse the given string into the format expected by this kind of column, returning Optional.empty() on failure.

Methods inherited from class edu.cmu.cs.cs214.hw5.columns.AbstractColumn

extract, extractAll, extractAllFrom, getName, isValid

Methods inherited from class java.lang.Object

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

Constructor Detail

StringColumn

public StringColumn(java.lang.String name)

Create a new string column with the given name.

Parameters:

name - the name for this string column, like "City" or "Favorite programming language"

Method Detail

getTypeName

public java.lang.String getTypeName()

Description copied from interface: ColumnSpecification

Get a human-readable name of this type of column specification. For example, "Numeric column".

Returns:

a name for this column specification

parse

protected java.util.Optional<java.lang.String> parse(java.lang.String s)

Description copied from class: AbstractColumn

Attempt to parse the given string into the format expected by this kind of column, returning Optional.empty() on failure.

Specified by:

parse in class AbstractColumn<java.lang.String>

Parameters:

s - a string representing an entry in a column, which may or may not be valid

Returns:

an Optional of the correctly parsed value, or Optional.empty() if the given string is not valid; this must not be null