org.whaka.data

Class Columns

java.lang.Object

org.whaka.data.Columns

All Implemented Interfaces:

java.lang.Iterable<Column<?>>

public final class Columns
extends java.lang.Object
implements java.lang.Iterable<Column<?>>

Class represents a "table" of data, as ordered collection of the Column instances.

Provides functionality to add columns as already created instances, or as keys and data. Also to get, or remove added columns.

Note: class doesn't override default hash-code and equals functionality! Columns is immutable and unique "by instance" and may be compared by links.

Field Summary

Fields

Modifier and Type	Field and Description
java.util.List<Column<?>>	columns

Constructor Summary

Constructors

Constructor and Description
Columns(java.util.Collection<Column<?>> columns)
Columns(Column<?>... columns) Equal to Columns(Collection) with specified columns wrapped into Arrays.asList(Object...)

Method Summary

Modifier and Type	Method and Description
<T> Column<T>	getColumn(ColumnKey<T> key) Returns a column with the same key as specified, or null.
java.util.List<Column<?>>	getColumns()
boolean	isPresent(ColumnKey<?> key)
java.util.Iterator<Column<?>>	iterator()
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

columns

public final java.util.List<Column<?>> columns

Constructor Detail

Columns

public Columns(Column<?>... columns)

Equal to Columns(Collection) with specified columns wrapped into Arrays.asList(Object...)

Columns

public Columns(java.util.Collection<Column<?>> columns)

Throws:

java.lang.IllegalArgumentException - if specified collection contains null value, or if any two columns in the collection contains the same column key.

Method Detail

isPresent

public boolean isPresent(ColumnKey<?> key)

getColumn

public <T> Column<T> getColumn(ColumnKey<T> key)

Returns a column with the same key as specified, or null.

getColumns

public java.util.List<Column<?>> getColumns()

iterator

public java.util.Iterator<Column<?>> iterator()

Specified by:

iterator in interface java.lang.Iterable<Column<?>>

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object