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.
| Constructor and Description |
|---|
Columns(java.util.Collection<Column<?>> columns) |
Columns(Column<?>... columns)
Equal to
Columns(Collection) with specified columns
wrapped into Arrays.asList(Object...) |
| 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() |
public final java.util.List<Column<?>> columns
public Columns(Column<?>... columns)
Columns(Collection) with specified columns
wrapped into Arrays.asList(Object...)public Columns(java.util.Collection<Column<?>> columns)
java.lang.IllegalArgumentException - if specified collection contains null value, or if any two columns
in the collection contains the same column key.public boolean isPresent(ColumnKey<?> key)
public <T> Column<T> getColumn(ColumnKey<T> key)
null.public java.util.List<Column<?>> getColumns()
public java.util.Iterator<Column<?>> iterator()
iterator in interface java.lang.Iterable<Column<?>>public java.lang.String toString()
toString in class java.lang.Object