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 /*
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  * Licensed to the Apache Software Foundation (ASF) under one or more
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  * contributor license agreements.  See the NOTICE file distributed with
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  * this work for additional information regarding copyright ownership.
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  * The ASF licenses this file to You under the Apache License, Version 2.0
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  * (the "License"); you may not use this file except in compliance with
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  * the License.  You may obtain a copy of the License at
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  *
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  *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package org.apache.wicket.model;


A IModel wraps the actual model Object used by a Component. IModel implementations are used as a facade for the real model so that users have control over the actual persistence strategy. Note that objects implementing this interface will be stored in the Session. Hence, you should use (non-transient) instance variables sparingly.
  • Basic Models - To implement a basic (non-detachable) model which holds its entire state in the Session, you can use the simple model wrapper Model.
  • Detachable Models - IModel inherits a hook, IDetachable.detach(), so that interface implementers can detach transient information when a model is no longer being actively used by the framework. This reduces memory use and reduces the expense of replicating the model in a clustered server environment. To implement a detachable model, you should generally extend LoadableDetachableModel instead of implementing IModel directly.
  • Property Models - The AbstractPropertyModel class provides default functionality for property models. A property model provides access to a particular property of its wrapped model.
  • Compound Property Models - The IModel interface is parameterized by Component, allowing a model to be shared among several Components. When the getObject()method is called, the value returned will depend on the Component which is asking for the value. Likewise, the setObject(java.lang.Object)method sets a different property depending on which Component is doing the setting. For more information on CompoundPropertyModels and model inheritance, see CompoundPropertyModeland org.apache.wicket.Page.

Author(s):
Chris Turner
Eelco Hillenius
Jonathan Locke TODO 3.0: Vote on renaming get/setObject to get/setValue
See also:
org.apache.wicket.Component.sameInnermostModel(org.apache.wicket.Component)
org.apache.wicket.Component.sameInnermostModel(org.apache.wicket.model.IModel)
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public interface IModel extends IDetachable
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{
Gets the model object.

Returns:
The model object
Sets the model object.

Parameters:
object The model object
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	void setObject(final Object object);
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