/*
* 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;
/**
* <p><code>Closure</code> that sets a property.</p>
* <p>
* An implementation of <code>org.apache.commons.collections.Closure</code> that updates
* a specified property on the object provided with a specified value.
* The <code>BeanPropertyValueChangeClosure</code> constructor takes two parameters which determine
* what property will be updated and with what value.
* <dl>
* <dt>
* <b><code>
* <pre>public BeanPropertyValueChangeClosure( String propertyName, Object propertyValue )</pre>
* </code></b>
* </dt>
* <dd>
* Will create a <code>Closure</code> that will update an object by setting the property
* specified by <code>propertyName</code> to the value specified by <code>propertyValue</code>.
* </dd>
* </dl>
*
* <p/>
* <strong>Note:</strong> Property names can be a simple, nested, indexed, or mapped property as defined by
* <code>org.apache.commons.beanutils.PropertyUtils</code>. If any object in the property path
* specified by <code>propertyName</code> is <code>null</code> then the outcome is based on the
* value of the <code>ignoreNull</code> attribute.
*
* <p/>
* A typical usage might look like:
* <code><pre>
* // create the closure
* BeanPropertyValueChangeClosure closure =
* new BeanPropertyValueChangeClosure( "activeEmployee", Boolean.TRUE );
*
* // update the Collection
* CollectionUtils.forAllDo( peopleCollection, closure );
* </pre></code>
* <p/>
*
* This would take a <code>Collection</code> of person objects and update the
* <code>activeEmployee</code> property of each object in the <code>Collection</code> to
* <code>true</code>. Assuming...
* <ul>
* <li>
* The top level object in the <code>peopleCollection</code> is an object which represents a
* person.
* </li>
* <li>
* The person object has a <code>setActiveEmployee( boolean )</code> method which updates
* the value for the object's <code>activeEmployee</code> property.
* </li>
* </ul>
*
* @author Norm Deane
* @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 <code>Closure</code> executes.
*/
private String propertyName;
/**
* The value that the property specified by <code>propertyName</code>
* will be updated to when this <code>Closure</code> executes.
*/
private Object propertyValue;
/**
* Determines whether <code>null</code> objects in the property path will genenerate an
* <code>IllegalArgumentException</code> or not. If set to <code>true</code> then if any objects
* in the property path leading up to the target property evaluate to <code>null</code> then the
* <code>IllegalArgumentException</code> throw by <code>PropertyUtils</code> will be logged but
* not rethrown. If set to <code>false</code> then if any objects in the property path leading
* up to the target property evaluate to <code>null</code> then the
* <code>IllegalArgumentException</code> throw by <code>PropertyUtils</code> 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 <code>ignoreNull</code> to be <code>false</code>.
*
* @param propertyName The name of the property that will be updated with the value specified by
* <code>propertyValue</code>.
* @param propertyValue The value that <code>propertyName</code> will be set to on the target
* object.
* @throws IllegalArgumentException If the propertyName provided is null or empty.
*/
public BeanPropertyValueChangeClosure(String propertyName, 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 <code>null</code> objects in the
* property path will genenerate an <code>IllegalArgumentException</code> or not.
*
* @param propertyName The name of the property that will be updated with the value specified by
* <code>propertyValue</code>.
* @param propertyValue The value that <code>propertyName</code> will be set to on the target
* object.
* @param ignoreNull Determines whether <code>null</code> objects in the property path will
* genenerate an <code>IllegalArgumentException</code> or not.
* @throws IllegalArgumentException If the propertyName provided is null or empty.
*/
public BeanPropertyValueChangeClosure(String propertyName, Object propertyValue, 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
* <code>BeanPropertyValueChangeClosure</code> was constructed. If any object in the property
* path leading up to the target property is <code>null</code> then the outcome will be based on
* the value of the <code>ignoreNull</code> attribute. By default, <code>ignoreNull</code> is
* <code>false</code> and would result in an <code>IllegalArgumentException</code> if an object
* in the property path leading up to the target property is <code>null</code>.
*
* @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 <code>null</code> and
* <code>ignoreNull</code> is set to <code>false</code>.
*/
public void execute(Object object) {
try {
PropertyUtils.setProperty(object, propertyName, propertyValue);
} catch (IllegalArgumentException e) {
final String errorMsg = "Unable to execute Closure. Null value encountered in property path...";
if (ignoreNull) {
log.warn("WARNING: " + errorMsg + e);
} else {
IllegalArgumentException iae = new IllegalArgumentException(errorMsg);
if (!BeanUtils.initCause(iae, e)) {
log.error(errorMsg, e);
}
throw iae;
}
} catch (IllegalAccessException e) {
final String errorMsg = "Unable to access the property provided.";
IllegalArgumentException iae = new IllegalArgumentException(errorMsg);
if (!BeanUtils.initCause(iae, e)) {
log.error(errorMsg, e);
}
throw iae;
} catch (InvocationTargetException e) {
final String errorMsg = "Exception occurred in property's getter";
IllegalArgumentException iae = new IllegalArgumentException(errorMsg);
if (!BeanUtils.initCause(iae, e)) {
log.error(errorMsg, e);
}
throw iae;
} catch (NoSuchMethodException e) {
final String errorMsg = "Property not found";
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 <code>Closure</code> executes.
*
* @return The name of the property which will be updated when this <code>Closure</code> executes.
*/
public String getPropertyName() {
return propertyName;
}
/**
* Returns the value that the property specified by <code>propertyName</code>
* will be updated to when this <code>Closure</code> executes.
*
* @return The value that the property specified by <code>propertyName</code>
* will be updated to when this <code>Closure</code> executes.
*/
public Object getPropertyValue() {
return propertyValue;
}
/**
* Returns the flag that determines whether <code>null</code> objects in the property path will
* genenerate an <code>IllegalArgumentException</code> or not. If set to <code>true</code> then
* if any objects in the property path leading up to the target property evaluate to
* <code>null</code> then the <code>IllegalArgumentException</code> throw by
* <code>PropertyUtils</code> will be logged but not rethrown. If set to <code>false</code> then
* if any objects in the property path leading up to the target property evaluate to
* <code>null</code> then the <code>IllegalArgumentException</code> throw by
* <code>PropertyUtils</code> will be logged and rethrown.
*
* @return The flag that determines whether <code>null</code> objects in the property path will
* genenerate an <code>IllegalArgumentException</code> or not.
*/
public boolean isIgnoreNull() {
return ignoreNull;
}
}