BeanUtils.java

/* Copyright (c) 2011 GeoSolutions - http://www.geo-solutions.it/.  All rights reserved.
 * This code is licensed under the GPL 2.0 license, available at the root
 * application directory.
 */
package it.geosolutions.geoserver.jms.impl.utils;

import it.geosolutions.geoserver.jms.impl.handlers.catalog.CatalogUtils;

import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.commons.beanutils.PropertyUtils;

/**
 * This class implements a set of function inspired by the Apache BeanUtils
 * defining wrappers which are designed to work with the GeoServer catalog and configuration 
 * 
 * @author Carlo Cancellieri - carlo.cancellieri@geo-solutions.it
 *
 */
public abstract class BeanUtils {

	/**
	 * This is a 'smart' (perform checks for some special cases) update function which should be used to copy of the properties for objects
	 * of the catalog and configuration.
	 * 
	 * @param <T> the type of the bean to update
	 * @param info the bean instance to update
	 * @param properties the list of string of properties to update
	 * @param values the list of new values to update
	 * 
	 * @throws IllegalAccessException
	 * @throws InvocationTargetException
	 * @throws NoSuchMethodException
	 */
	public static <T> void smartUpdate(final T info , final List<String> properties, final List<Object> values) throws IllegalAccessException, InvocationTargetException, NoSuchMethodException{
		final Iterator<String> itPropertyName=properties.iterator();
		final Iterator<Object> itValue=values.iterator();
		while (itPropertyName.hasNext() && itValue.hasNext()){
			String propertyName=itPropertyName.next();
			final Object value = itValue.next();
			
			PropertyDescriptor pd = PropertyUtils.getPropertyDescriptor(info,propertyName);
			// return null if there is no such descriptor
			if (pd==null){
				// this is a special case used by the NamespaceInfoImpl setURI
				// the propertyName coming from the ModificationProxy is set to 'uRI'
				// lets set it to uri
				propertyName=propertyName.toUpperCase();
				pd = PropertyUtils.getPropertyDescriptor(info,propertyName);
				if (pd==null){
					return;	
				}
			}
	        if(pd.getWriteMethod() != null) {
	            PropertyUtils.setProperty(info, propertyName, value);
	        } else {
	        	// T interface do not declare setter method for this property
	        	// lets use getter methods to get the property reference
	        	final Object property=PropertyUtils.getProperty(info,propertyName);
	        	
	        	// check type of property to apply new value
	            if(Collection.class.isAssignableFrom(pd.getPropertyType())) {
	                final Collection<?> liveCollection = (Collection<?>) property; 
	                liveCollection.clear();
	                liveCollection.addAll((Collection) value);
	            } else if(Map.class.isAssignableFrom(pd.getPropertyType())) {
	                final Map<?,?> liveMap= (Map<?,?>) property;
	                liveMap.clear();
	                liveMap.putAll((Map) value);
	            } else {
	                if (CatalogUtils.LOGGER.isLoggable(java.util.logging.Level.SEVERE))
	                	CatalogUtils.LOGGER.severe("Skipping unwritable property " +propertyName + " with property type " + pd.getPropertyType());
	            }
	        }
	    }
	}

}