org.apache.commons.beanutils
Class BeanPropertyValueChangeClosure

java.lang.Object
  extended by org.apache.commons.beanutils.BeanPropertyValueChangeClosure
All Implemented Interfaces:
org.apache.commons.collections.Closure

public class BeanPropertyValueChangeClosure
extends java.lang.Object
implements org.apache.commons.collections.Closure

Closure that sets a property.

An implementation of org.apache.commons.collections.Closure that updates a specified property on the object provided with a specified value. The BeanPropertyValueChangeClosure constructor takes two parameters which determine what property will be updated and with what value.

public BeanPropertyValueChangeClosure( String propertyName, Object propertyValue )
Will create a Closure that will update an object by setting the property specified by propertyName to the value specified by propertyValue.

Note: Property names can be a simple, nested, indexed, or mapped property as defined by org.apache.commons.beanutils.PropertyUtils. If any object in the property path specified by propertyName is null then the outcome is based on the value of the ignoreNull attribute.

A typical usage might look like:

 // create the closure
 BeanPropertyValueChangeClosure closure =
    new BeanPropertyValueChangeClosure( "activeEmployee", Boolean.TRUE );

 // update the Collection
 CollectionUtils.forAllDo( peopleCollection, closure );
 

This would take a Collection of person objects and update the activeEmployee property of each object in the Collection to true. Assuming...

Author:
Norm Deane
See Also:
PropertyUtils, Closure

Field Summary
private  boolean ignoreNull
          Determines whether null objects in the property path will genenerate an IllegalArgumentException or not.
private  org.apache.commons.logging.Log log
          For logging.
private  java.lang.String propertyName
          The name of the property which will be updated when this Closure executes.
private  java.lang.Object propertyValue
          The value that the property specified by propertyName will be updated to when this Closure executes.
 
Constructor Summary
BeanPropertyValueChangeClosure(java.lang.String propertyName, java.lang.Object propertyValue)
          Constructor which takes the name of the property to be changed, the new value to set the property to, and assumes ignoreNull to be false.
BeanPropertyValueChangeClosure(java.lang.String propertyName, java.lang.Object propertyValue, boolean ignoreNull)
          Constructor which takes the name of the property to be changed, the new value to set the property to and a boolean which determines whether null objects in the property path will genenerate an IllegalArgumentException or not.
 
Method Summary
 void execute(java.lang.Object object)
          Updates the target object provided using the property update criteria provided when this BeanPropertyValueChangeClosure was constructed.
 java.lang.String getPropertyName()
          Returns the name of the property which will be updated when this Closure executes.
 java.lang.Object getPropertyValue()
          Returns the value that the property specified by propertyName will be updated to when this Closure executes.
 boolean isIgnoreNull()
          Returns the flag that determines whether null objects in the property path will genenerate an IllegalArgumentException or not.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

log

private final org.apache.commons.logging.Log log
For logging.


propertyName

private java.lang.String propertyName
The name of the property which will be updated when this Closure executes.


propertyValue

private java.lang.Object propertyValue
The value that the property specified by propertyName will be updated to when this Closure executes.


ignoreNull

private boolean ignoreNull
Determines whether null objects in the property path will genenerate an IllegalArgumentException or not. If set to true then if any objects in the property path leading up to the target property evaluate to null then the IllegalArgumentException throw by PropertyUtils will be logged but not rethrown. If set to false then if any objects in the property path leading up to the target property evaluate to null then the IllegalArgumentException throw by PropertyUtils will be logged and rethrown.

Constructor Detail

BeanPropertyValueChangeClosure

public BeanPropertyValueChangeClosure(java.lang.String propertyName,
                                      java.lang.Object propertyValue)
Constructor which takes the name of the property to be changed, the new value to set the property to, and assumes ignoreNull to be false.

Parameters:
propertyName - The name of the property that will be updated with the value specified by propertyValue.
propertyValue - The value that propertyName will be set to on the target object.
Throws:
java.lang.IllegalArgumentException - If the propertyName provided is null or empty.

BeanPropertyValueChangeClosure

public BeanPropertyValueChangeClosure(java.lang.String propertyName,
                                      java.lang.Object propertyValue,
                                      boolean ignoreNull)
Constructor which takes the name of the property to be changed, the new value to set the property to and a boolean which determines whether null objects in the property path will genenerate an IllegalArgumentException or not.

Parameters:
propertyName - The name of the property that will be updated with the value specified by propertyValue.
propertyValue - The value that propertyName will be set to on the target object.
ignoreNull - Determines whether null objects in the property path will genenerate an IllegalArgumentException or not.
Throws:
java.lang.IllegalArgumentException - If the propertyName provided is null or empty.
Method Detail

execute

public void execute(java.lang.Object object)
Updates the target object provided using the property update criteria provided when this BeanPropertyValueChangeClosure was constructed. If any object in the property path leading up to the target property is null then the outcome will be based on the value of the ignoreNull attribute. By default, ignoreNull is false and would result in an IllegalArgumentException if an object in the property path leading up to the target property is null.

Specified by:
execute in interface org.apache.commons.collections.Closure
Parameters:
object - The object to be updated.
Throws:
java.lang.IllegalArgumentException - If an IllegalAccessException, InvocationTargetException, or NoSuchMethodException is thrown when trying to access the property specified on the object provided. Or if an object in the property path provided is null and ignoreNull is set to false.

getPropertyName

public java.lang.String getPropertyName()
Returns the name of the property which will be updated when this Closure executes.

Returns:
The name of the property which will be updated when this Closure executes.

getPropertyValue

public java.lang.Object getPropertyValue()
Returns the value that the property specified by propertyName will be updated to when this Closure executes.

Returns:
The value that the property specified by propertyName will be updated to when this Closure executes.

isIgnoreNull

public boolean isIgnoreNull()
Returns the flag that determines whether null objects in the property path will genenerate an IllegalArgumentException or not. If set to true then if any objects in the property path leading up to the target property evaluate to null then the IllegalArgumentException throw by PropertyUtils will be logged but not rethrown. If set to false then if any objects in the property path leading up to the target property evaluate to null then the IllegalArgumentException throw by PropertyUtils will be logged and rethrown.

Returns:
The flag that determines whether null objects in the property path will genenerate an IllegalArgumentException or not.


Copyright (c) 2000-2008 - Apache Software Foundation