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package org.apache.commons.beanutils;
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 DynaBean
s - 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: $Id$ 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.
/**
* <p>Decorates a {@link DynaBean} to provide <code>Map</code> behaviour.</p>
*
* <p>The motivation for this implementation is to provide access to {@link DynaBean}
* properties in technologies that are unaware of BeanUtils and {@link DynaBean}s -
* such as the expression languages of JSTL and JSF.</p>
*
* <p>This can be achieved either by wrapping the {@link DynaBean} prior to
* providing it to the technolody to process or by providing a <code>Map</code>
* accessor method on the DynaBean implementation:
* <pre><code>
* public Map getMap() {
* return new DynaBeanMapDecorator(this);
* }</code></pre>
* </ul>
* </p>
*
* <p>This, for example, could be used in JSTL in the following way to access
* a DynaBean's <code>fooProperty</code>:
* <ul><li><code>${myDynaBean.<b>map</b>.fooProperty}</code></li></ul>
* </p>
*
* <h3>Usage</h3>
*
* <p>To decorate a {@link DynaBean} simply instantiate this class with the
* target {@link DynaBean}:</p>
*
* <ul><li><code>Map fooMap = new DynaBeanMapDecorator(fooDynaBean);</code></li></ul>
*
* <p>The above example creates a <b><i>read only</i></b> <code>Map</code>.
* To create a <code>Map</code> which can be modified, construct a
* <code>DynaBeanMapDecorator</code> with the <b><i>read only</i></b>
* attribute set to <code>false</code>:</p>
*
* <ul><li><code>Map fooMap = new DynaBeanMapDecorator(fooDynaBean, false);</code></li></ul>
*
* <h3>Limitations</h3>
* <p>In this implementation the <code>entrySet()</code>, <code>keySet()</code>
* and <code>values()</code> methods create an <b><i>unmodifiable</i></b>
* <code>Set</code> and it does not support the Map's <code>clear()</code>
* and <code>remove()</code> operations.</p>
* <p>For reasons of backwards compatibility, the generic types of this
* {@code Map} implementation are {@code <Object, Object>}. However, the
* keys of the map are typically strings.</p>
*
* @since BeanUtils 1.8.0
* @version $Id$
* @deprecated Use {@link 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
* {@code DynaBeanPropertyMapDecorator} was introduced as a replacement.
*/
@Deprecated
public class DynaBeanMapDecorator extends BaseDynaBeanMapDecorator<Object> {
Construct a Map for the specified DynaBean
. Params: - dynaBean – The dyna bean being decorated
- readOnly –
true
if the Map is read only
otherwise false
Throws: - IllegalArgumentException – if the
DynaBean
is null.
/**
* Construct a Map for the specified {@link DynaBean}.
*
* @param dynaBean The dyna bean being decorated
* @param readOnly <code>true</code> if the Map is read only
* otherwise <code>false</code>
* @throws IllegalArgumentException if the {@link DynaBean} is null.
*/
public DynaBeanMapDecorator(final DynaBean dynaBean, final boolean readOnly) {
super(dynaBean, readOnly);
}
Constructs a read only Map for the specified DynaBean
. Params: - dynaBean – The dyna bean being decorated
Throws: - IllegalArgumentException – if the
DynaBean
is null.
/**
* Constructs a read only Map for the specified
* {@link DynaBean}.
*
* @param dynaBean The dyna bean being decorated
* @throws IllegalArgumentException if the {@link DynaBean} is null.
*/
public DynaBeanMapDecorator(final DynaBean dynaBean) {
super(dynaBean);
}
@Override
protected Object convertKey(final String propertyName) {
return propertyName;
}
}