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/*
* 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 org.apache.commons.beanutils;
import org.apache.commons.collections.Closure;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.lang.reflect.InvocationTargetException;
/**
* 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 );
*
Collection of person objects and update the
* activeEmployee property of each object in the Collection to
* true. Assuming...
*
* -
* The top level object in the
peopleCollection is an object which represents a
* person.
*
* -
* The person object has a
setActiveEmployee( boolean ) method which updates
* the value for the object's activeEmployee property.
*
*
*
* @version $Id$
* @see org.apache.commons.beanutils.PropertyUtils
* @see org.apache.commons.collections.Closure
*/
public class BeanPropertyValueChangeClosure implements Closure {
/** For logging. */
private final Log log = LogFactory.getLog(this.getClass());
/**
* The name of the property which will be updated when this Closure executes.
*/
private String propertyName;
/**
* The value that the property specified by propertyName
* will be updated to when this Closure executes.
*/
private Object propertyValue;
/**
* 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.
*/
private boolean ignoreNull;
/**
* 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.
*
* @param propertyName The name of the property that will be updated with the value specified by
* propertyValue.
* @param propertyValue The value that propertyName will be set to on the target
* object.
* @throws IllegalArgumentException If the propertyName provided is null or empty.
*/
public BeanPropertyValueChangeClosure(final String propertyName, final Object propertyValue) {
this(propertyName, propertyValue, false);
}
/**
* 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.
*
* @param propertyName The name of the property that will be updated with the value specified by
* propertyValue.
* @param propertyValue The value that propertyName will be set to on the target
* object.
* @param ignoreNull Determines whether null objects in the property path will
* genenerate an IllegalArgumentException or not.
* @throws IllegalArgumentException If the propertyName provided is null or empty.
*/
public BeanPropertyValueChangeClosure(final String propertyName, final Object propertyValue, final boolean ignoreNull) {
super();
if ((propertyName != null) && (propertyName.length() > 0)) {
this.propertyName = propertyName;
this.propertyValue = propertyValue;
this.ignoreNull = ignoreNull;
} else {
throw new IllegalArgumentException("propertyName cannot be null or empty");
}
}
/**
* 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.
*
* @param object The object to be updated.
* @throws 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.
*/
public void execute(final Object object) {
try {
PropertyUtils.setProperty(object, propertyName, propertyValue);
} catch (final IllegalArgumentException e) {
final String errorMsg = "Unable to execute Closure. Null value encountered in property path...";
if (ignoreNull) {
log.warn("WARNING: " + errorMsg + e);
} else {
final IllegalArgumentException iae = new IllegalArgumentException(errorMsg);
if (!BeanUtils.initCause(iae, e)) {
log.error(errorMsg, e);
}
throw iae;
}
} catch (final IllegalAccessException e) {
final String errorMsg = "Unable to access the property provided.";
final IllegalArgumentException iae = new IllegalArgumentException(errorMsg);
if (!BeanUtils.initCause(iae, e)) {
log.error(errorMsg, e);
}
throw iae;
} catch (final InvocationTargetException e) {
final String errorMsg = "Exception occurred in property's getter";
final IllegalArgumentException iae = new IllegalArgumentException(errorMsg);
if (!BeanUtils.initCause(iae, e)) {
log.error(errorMsg, e);
}
throw iae;
} catch (final NoSuchMethodException e) {
final String errorMsg = "Property not found";
final IllegalArgumentException iae = new IllegalArgumentException(errorMsg);
if (!BeanUtils.initCause(iae, e)) {
log.error(errorMsg, e);
}
throw iae;
}
}
/**
* Returns the name of the property which will be updated when this Closure executes.
*
* @return The name of the property which will be updated when this Closure executes.
*/
public String getPropertyName() {
return propertyName;
}
/**
* Returns the value that the property specified by propertyName
* will be updated to when this Closure executes.
*
* @return The value that the property specified by propertyName
* will be updated to when this Closure executes.
*/
public Object getPropertyValue() {
return propertyValue;
}
/**
* 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.
*
* @return The flag that determines whether null objects in the property path will
* genenerate an IllegalArgumentException or not.
*/
public boolean isIgnoreNull() {
return ignoreNull;
}
}