| BeanPropertyDescriptor.java |
/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2001-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Axis" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.jboss.axis.utils;
import org.jboss.logging.Logger;
import java.beans.IndexedPropertyDescriptor;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Array;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* This class represents a field/property in a value type (a class with either
* bean-style getters/setters or public fields).
* <p/>
* It is essentially a thin wrapper around the PropertyDescriptor from the
* JavaBean utilities. We wrap it with this class so that we can create
* the subclass FieldPropertyDescriptor and access public fields (who
* wouldn't have PropertyDescriptors normally) via the same interface.
* <p/>
* There are also some interesting tricks where indexed properties are
* concerned, mostly involving the fact that we manage the arrays here
* rather than relying on the value type class to do it itself.
*
* @author Rich Scheuerle <scheu@us.ibm.com>
* @author Glen Daniels (gdaniels@apache.org)
*/
public class BeanPropertyDescriptor
{
private static Logger log = Logger.getLogger(BeanPropertyDescriptor.class.getName());
protected PropertyDescriptor myPD = null;
protected static final Object[] noArgs = new Object[]{};
/**
* Constructor (takes a PropertyDescriptor)
*
* @param pd
*/
public BeanPropertyDescriptor(PropertyDescriptor pd)
{
myPD = pd;
}
/**
* Protected constructor for use by our children
*/
protected BeanPropertyDescriptor()
{
}
/**
* Get our property name.
*/
public String getName()
{
return myPD.getName();
}
/**
* Query if property is readable
*
* @return true if readable
*/
public boolean isReadable()
{
return (myPD.getReadMethod() != null);
}
/**
* Query if property is writeable
*
* @return true if writeable
*/
public boolean isWriteable()
{
return (myPD.getWriteMethod() != null);
}
/**
* Query if property is indexed.
*
* @return true if indexed methods exist
*/
public boolean isIndexed()
{
return (myPD instanceof IndexedPropertyDescriptor);
}
/**
* Get the property value
*
* @param obj is the object
* @return the entire propery value
*/
public Object get(Object obj)
throws InvocationTargetException, IllegalAccessException
{
if (obj == null)
throw new IllegalArgumentException("Target object cannot be null");
Method readMethod = myPD.getReadMethod();
log.debug("get: [method=" + readMethod + "]");
if (readMethod != null)
{
Object retObj = readMethod.invoke(obj, noArgs);
log.debug("got: " + retObj);
return retObj;
}
throw new IllegalAccessException(Messages.getMessage("badGetter00"));
}
/**
* Set the property value
*
* @param obj is the object
* @param newValue is the new value
*/
public void set(Object obj, Object newValue)
throws InvocationTargetException, IllegalAccessException
{
if (obj == null)
throw new IllegalArgumentException("Target object cannot be null");
Method writeMethod = myPD.getWriteMethod();
log.debug("set: [val=" + newValue + ",method=" + writeMethod + "]");
if (writeMethod != null)
{
writeMethod.invoke(obj, new Object[]{newValue});
}
else
{
throw new IllegalAccessException(Messages.getMessage("badSetter00"));
}
}
/**
* Get an indexed property
*
* @param obj is the object
* @param i the index
* @return the object at the indicated index
*/
public Object get(Object obj, int i)
throws InvocationTargetException, IllegalAccessException
{
if (obj == null)
throw new IllegalArgumentException("Target object cannot be null");
if (!isIndexed())
{
return Array.get(get(obj), i);
}
else
{
IndexedPropertyDescriptor id = (IndexedPropertyDescriptor)myPD;
Method readMethod = id.getIndexedReadMethod();
log.debug("get: [method=" + readMethod + ",index=" + i + "]");
Object retObj = readMethod.invoke(obj, new Object[]{new Integer(i)});
log.debug("got: " + retObj);
return retObj;
}
}
/**
* Set an indexed property value
*
* @param obj is the object
* @param i the index
* @param newValue is the new value
*/
public void set(Object obj, int i, Object newValue)
throws InvocationTargetException, IllegalAccessException
{
if (obj == null)
throw new IllegalArgumentException("Target object cannot be null");
// Set the new value
if (isIndexed())
{
IndexedPropertyDescriptor id = (IndexedPropertyDescriptor)myPD;
growArrayToSize(obj, id.getIndexedPropertyType(), i);
id.getIndexedWriteMethod().invoke(obj,
new Object[]{
new Integer(i), newValue});
}
else
{
Object array = get(obj);
if (array == null || Array.getLength(array) <= i)
{
Class componentType = getType().getComponentType();
growArrayToSize(obj, componentType, i);
array = get(obj);
}
Array.set(array, i, newValue);
}
}
/**
* Grow the array
*
* @param obj
* @param componentType
* @param i
* @throws InvocationTargetException
* @throws IllegalAccessException
*/
protected void growArrayToSize(Object obj, Class componentType, int i) throws InvocationTargetException, IllegalAccessException
{
if (obj == null)
throw new IllegalArgumentException("Target object cannot be null");
// Get the entire array and make sure it is large enough
Object array = get(obj);
if (array == null || Array.getLength(array) <= i)
{
// Construct a larger array of the same type
Object newArray = Array.newInstance(componentType, i + 1);
// Copy over the old elements
if (array != null)
{
System.arraycopy(array, 0, newArray, 0, Array.getLength(array));
}
// Set the object to use the larger array
set(obj, newArray);
}
}
/**
* Get the type of a property
*
* @return the type of the property
*/
public Class getType()
{
if (isIndexed())
{
return ((IndexedPropertyDescriptor)myPD).getIndexedPropertyType();
}
else
{
return myPD.getPropertyType();
}
}
}
| BeanPropertyDescriptor.java |