org.apache.wicket.markup.repeater
Class ReuseIfModelsEqualStrategy
java.lang.Object
org.apache.wicket.markup.repeater.ReuseIfModelsEqualStrategy
- All Implemented Interfaces:
- Serializable, IClusterable, IItemReuseStrategy
public class ReuseIfModelsEqualStrategy
- extends Object
- implements IItemReuseStrategy
Reuse strategy that will reuse an old item if its model is equal to a model inside the newModels
iterator. Useful when state needs to be kept across requests for as long as the item is visible
within the view.
Notice that the model and not the model object needs to implement the equals
method. Most of the time it is a good idea to forward the equals call to the object, however if a
detachable model is used it is often enough to compare object ids models point to ( this saves
the model from loading the object).
- Author:
- Igor Vaynberg (ivaynberg)
- See Also:
- Serialized Form
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
ReuseIfModelsEqualStrategy
public ReuseIfModelsEqualStrategy()
getInstance
public static IItemReuseStrategy getInstance()
- Returns:
- static instance
getItems
public <T> Iterator<Item<T>> getItems(IItemFactory<T> factory,
Iterator<IModel<T>> newModels,
Iterator<Item<T>> existingItems)
- Description copied from interface:
IItemReuseStrategy
- Returns an iterator over items that will be added to the view. The iterator needs to return
all the items because the old ones are removed prior to the new ones added.
- Specified by:
getItems
in interface IItemReuseStrategy
- Type Parameters:
T
- type of Item- Parameters:
factory
- implementation of IItemFactorynewModels
- iterator over models for itemsexistingItems
- iterator over child items
- Returns:
- iterator over items that will be added after all the old items are moved.
- See Also:
IItemReuseStrategy.getItems(org.apache.wicket.markup.repeater.IItemFactory,
java.util.Iterator, java.util.Iterator)
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