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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.feilong.lib.beanutils;
import java.io.Serializable;
import java.lang.reflect.InvocationTargetException;
import org.apache.commons.beanutils.DynaBean;
/**
*
* Implementation of DynaBean that wraps a standard JavaBean
* instance, so that DynaBean APIs can be used to access its properties.
*
*
*
* The most common use cases for this class involve wrapping an existing java bean.
* (This makes it different from the typical use cases for other DynaBean's.)
* For example:
*
*
* Object aJavaBean = ...;
* ...
* DynaBean db = new WrapDynaBean(aJavaBean);
* ...
*
* IMPLEMENTATION NOTE - This implementation does not
* support the contains() and remove() methods.
*
*
* @version $Id$
*/
public class WrapDynaBean implements DynaBean,Serializable{
// ---------------------------------------------------------- Constructors
/**
*
*/
private static final long serialVersionUID = -2177401532100818092L;
/**
* Construct a new DynaBean associated with the specified
* JavaBean instance.
*
* @param instance
* JavaBean instance to be wrapped
*/
public WrapDynaBean(final Object instance){
this(instance, null);
}
/**
* Creates a new instance of {@code WrapDynaBean}, associates it with the specified
* JavaBean instance, and initializes the bean's {@code DynaClass}. Using this
* constructor this {@code WrapDynaBean} instance can be assigned a class which has
* been configured externally. If no {@code WrapDynaClass} is provided, a new one is
* created using a standard mechanism.
*
* @param instance
* JavaBean instance to be wrapped
* @param cls
* the optional {@code WrapDynaClass} to be used for this bean
* @since 1.9
*/
public WrapDynaBean(final Object instance, final WrapDynaClass cls){
this.instance = instance;
this.dynaClass = (cls != null) ? cls : (WrapDynaClass) getDynaClass();
}
// ---------------------------------------------------- Instance Variables
/**
* The DynaClass "base class" that this DynaBean
* is associated with.
*/
protected transient WrapDynaClass dynaClass = null;
/**
* The JavaBean instance wrapped by this WrapDynaBean.
*/
protected Object instance = null;
// ------------------------------------------------------ DynaBean Methods
/**
* Does the specified mapped property contain a value for the specified
* key value?
*
* @param name
* Name of the property to check
* @param key
* Name of the key to check
* @return true if the mapped property contains a value for
* the specified key, otherwise false
*
* @throws IllegalArgumentException
* if there is no property
* of the specified name
*/
@Override
public boolean contains(final String name,final String key){
throw new UnsupportedOperationException("WrapDynaBean does not support contains()");
}
/**
* Return the value of a simple property with the specified name.
*
* @param name
* Name of the property whose value is to be retrieved
* @return The property's value
*
* @throws IllegalArgumentException
* if there is no property
* of the specified name
*/
@Override
public Object get(final String name){
Object value = null;
try{
value = getPropertyUtils().getSimpleProperty(instance, name);
}catch (final InvocationTargetException ite){
final Throwable cause = ite.getTargetException();
throw new IllegalArgumentException("Error reading property '" + name + "' nested exception - " + cause);
}catch (final Throwable t){
throw new IllegalArgumentException("Error reading property '" + name + "', exception - " + t);
}
return (value);
}
/**
* Return the value of an indexed property with the specified name.
*
* @param name
* Name of the property whose value is to be retrieved
* @param index
* Index of the value to be retrieved
* @return The indexed property's value
*
* @throws IllegalArgumentException
* if there is no property
* of the specified name
* @throws IllegalArgumentException
* if the specified property
* exists, but is not indexed
* @throws IndexOutOfBoundsException
* if the specified index
* is outside the range of the underlying property
* @throws NullPointerException
* if no array or List has been
* initialized for this property
*/
@Override
public Object get(final String name,final int index){
Object value = null;
try{
value = getPropertyUtils().getIndexedProperty(instance, name, index);
}catch (final IndexOutOfBoundsException e){
throw e;
}catch (final InvocationTargetException ite){
final Throwable cause = ite.getTargetException();
throw new IllegalArgumentException("Error reading indexed property '" + name + "' nested exception - " + cause);
}catch (final Throwable t){
throw new IllegalArgumentException("Error reading indexed property '" + name + "', exception - " + t);
}
return (value);
}
/**
* Return the value of a mapped property with the specified name,
* or null if there is no value for the specified key.
*
* @param name
* Name of the property whose value is to be retrieved
* @param key
* Key of the value to be retrieved
* @return The mapped property's value
*
* @throws IllegalArgumentException
* if there is no property
* of the specified name
* @throws IllegalArgumentException
* if the specified property
* exists, but is not mapped
*/
@Override
public Object get(final String name,final String key){
Object value = null;
try{
value = getPropertyUtils().getMappedProperty(instance, name, key);
}catch (final InvocationTargetException ite){
final Throwable cause = ite.getTargetException();
throw new IllegalArgumentException("Error reading mapped property '" + name + "' nested exception - " + cause);
}catch (final Throwable t){
throw new IllegalArgumentException("Error reading mapped property '" + name + "', exception - " + t);
}
return (value);
}
/**
* Return the DynaClass instance that describes the set of
* properties available for this DynaBean.
*
* @return The associated DynaClass
*/
@Override
public DynaClass getDynaClass(){
if (dynaClass == null){
dynaClass = WrapDynaClass.createDynaClass(instance.getClass());
}
return (this.dynaClass);
}
/**
* Remove any existing value for the specified key on the
* specified mapped property.
*
* @param name
* Name of the property for which a value is to
* be removed
* @param key
* Key of the value to be removed
*
* @throws IllegalArgumentException
* if there is no property
* of the specified name
*/
@Override
public void remove(final String name,final String key){
throw new UnsupportedOperationException("WrapDynaBean does not support remove()");
}
/**
* Set the value of a simple property with the specified name.
*
* @param name
* Name of the property whose value is to be set
* @param value
* Value to which this property is to be set
*
* @throws ConversionException
* if the specified value cannot be
* converted to the type required for this property
* @throws IllegalArgumentException
* if there is no property
* of the specified name
* @throws NullPointerException
* if an attempt is made to set a
* primitive property to null
*/
@Override
public void set(final String name,final Object value){
try{
getPropertyUtils().setSimpleProperty(instance, name, value);
}catch (final InvocationTargetException ite){
final Throwable cause = ite.getTargetException();
throw new IllegalArgumentException("Error setting property '" + name + "' nested exception -" + cause);
}catch (final Throwable t){
throw new IllegalArgumentException("Error setting property '" + name + "', exception - " + t);
}
}
/**
* Set the value of an indexed property with the specified name.
*
* @param name
* Name of the property whose value is to be set
* @param index
* Index of the property to be set
* @param value
* Value to which this property is to be set
*
* @throws ConversionException
* if the specified value cannot be
* converted to the type required for this property
* @throws IllegalArgumentException
* if there is no property
* of the specified name
* @throws IllegalArgumentException
* if the specified property
* exists, but is not indexed
* @throws IndexOutOfBoundsException
* if the specified index
* is outside the range of the underlying property
*/
@Override
public void set(final String name,final int index,final Object value){
try{
getPropertyUtils().setIndexedProperty(instance, name, index, value);
}catch (final IndexOutOfBoundsException e){
throw e;
}catch (final InvocationTargetException ite){
final Throwable cause = ite.getTargetException();
throw new IllegalArgumentException("Error setting indexed property '" + name + "' nested exception - " + cause);
}catch (final Throwable t){
throw new IllegalArgumentException("Error setting indexed property '" + name + "', exception - " + t);
}
}
/**
* Set the value of a mapped property with the specified name.
*
* @param name
* Name of the property whose value is to be set
* @param key
* Key of the property to be set
* @param value
* Value to which this property is to be set
*
* @throws ConversionException
* if the specified value cannot be
* converted to the type required for this property
* @throws IllegalArgumentException
* if there is no property
* of the specified name
* @throws IllegalArgumentException
* if the specified property
* exists, but is not mapped
*/
@Override
public void set(final String name,final String key,final Object value){
try{
getPropertyUtils().setMappedProperty(instance, name, key, value);
}catch (final InvocationTargetException ite){
final Throwable cause = ite.getTargetException();
throw new IllegalArgumentException("Error setting mapped property '" + name + "' nested exception - " + cause);
}catch (final Throwable t){
throw new IllegalArgumentException("Error setting mapped property '" + name + "', exception - " + t);
}
}
/**
* Gets the bean instance wrapped by this DynaBean.
* For most common use cases,
* this object should already be known
* and this method safely be ignored.
* But some creators of frameworks using DynaBean's may
* find this useful.
*
* @return the java bean Object wrapped by this DynaBean
*/
public Object getInstance(){
return instance;
}
// ------------------------------------------------------ Protected Methods
/**
* Return the property descriptor for the specified property name.
*
* @param name
* Name of the property for which to retrieve the descriptor
* @return The descriptor for the specified property
*
* @throws IllegalArgumentException
* if this is not a valid property
* name for our DynaClass
*/
protected DynaProperty getDynaProperty(final String name){
final DynaProperty descriptor = getDynaClass().getDynaProperty(name);
if (descriptor == null){
throw new IllegalArgumentException("Invalid property name '" + name + "'");
}
return (descriptor);
}
/**
* Returns the {@code PropertyUtilsBean} instance to be used for accessing properties.
* If available, this object is obtained from the associated {@code WrapDynaClass}.
*
* @return the associated {@code PropertyUtilsBean}
*/
private PropertyUtilsBean getPropertyUtils(){
PropertyUtilsBean propUtils = null;
if (dynaClass != null){
propUtils = dynaClass.getPropertyUtilsBean();
}
return (propUtils != null) ? propUtils : PropertyUtilsBean.getInstance();
}
}