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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 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:$Id$
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:
/** * 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:
/** * 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; } }