org.apache.commons.beanutils

Class DynaBeanMapDecorator

java.lang.Object

org.apache.commons.beanutils.BaseDynaBeanMapDecorator<Object>

org.apache.commons.beanutils.DynaBeanMapDecorator

All Implemented Interfaces:

Map<Object,Object>

Deprecated.

Use DynaBeanPropertyMapDecorator instead. When adding generics it turned out that it was not possible to use the correct type parameters without breaking backwards compatibility. Therefore, class DynaBeanPropertyMapDecorator was introduced as a replacement.

@Deprecated
public class DynaBeanMapDecorator
extends BaseDynaBeanMapDecorator<Object>

Decorates a DynaBean to provide Map behaviour.

The motivation for this implementation is to provide access to DynaBean properties in technologies that are unaware of BeanUtils and DynaBeans - such as the expression languages of JSTL and JSF.

This can be achieved either by wrapping the DynaBean prior to providing it to the technolody to process or by providing a Map accessor method on the DynaBean implementation:

         public Map getMap() {
             return new DynaBeanMapDecorator(this);
         }

This, for example, could be used in JSTL in the following way to access a DynaBean's fooProperty:

• ${myDynaBean.map.fooProperty}

Usage

To decorate a DynaBean simply instantiate this class with the target DynaBean:

• Map fooMap = new DynaBeanMapDecorator(fooDynaBean);

The above example creates a read only Map. To create a Map which can be modified, construct a DynaBeanMapDecorator with the read only attribute set to false:

• Map fooMap = new DynaBeanMapDecorator(fooDynaBean, false);

Limitations

In this implementation the entrySet(), keySet() and values() methods create an unmodifiable Set and it does not support the Map's clear() and remove() operations.

For reasons of backwards compatibility, the generic types of this Map implementation are <Object, Object>. However, the keys of the map are typically strings.

Since:

BeanUtils 1.8.0

Version:

$Id$