Package org.dellroad.stuff.vaadin7

Class AlwaysInvalidQueryList<T>

java.lang.Object

org.dellroad.stuff.vaadin7.AlwaysInvalidQueryList<T>

All Implemented Interfaces:

QueryList<T>

public class AlwaysInvalidQueryList<T>
extends Object
implements QueryList<T>

A QueryList that always throws InvalidQueryListException.

Constructor Summary

Constructors

Constructor	Description
AlwaysInvalidQueryList(long size)	Constructor.

Method Summary

Modifier and Type	Method	Description
T	get(long index)	Get an item in the list, or throw an exception if this instance is no longer valid or cannot provide the item.
long	size()	Get the total size of this list.

Methods inherited from class java.lang.Object

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

Constructor Detail

AlwaysInvalidQueryList

public AlwaysInvalidQueryList(long size)

Constructor.

Parameters:

size - size of this list to report via size

Throws:

IllegalArgumentException - if size is negative

Method Detail

size

public long size()

Description copied from interface: QueryList

Get the total size of this list.

For any given QueryList instance, this method is expected to return a the same value if invoked multiple times. Therefore, callers may safely choose to invoke it only once on a given instance and cache the result.

Specified by:

size in interface QueryList<T>

Returns:

total size of list

get

public T get(long index)
      throws InvalidQueryListException

Description copied from interface: QueryList

Get an item in the list, or throw an exception if this instance is no longer valid or cannot provide the item.

Specified by:

get in interface QueryList<T>

Parameters:

index - index of the item (zero-based)

Returns:

the list item at index

Throws:

InvalidQueryListException - if this list has become invalid or cannot provide the item