/*
* 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.jackrabbit.ocm.manager.collectionconverter;
import java.util.Collection;
import java.util.Map;
import org.apache.jackrabbit.ocm.exception.JcrMappingException;
import org.apache.jackrabbit.ocm.manager.collectionconverter.impl.ManageableCollectionImpl;
import org.apache.jackrabbit.ocm.manager.collectionconverter.impl.ManageableMapImpl;
import org.apache.jackrabbit.ocm.reflection.ReflectionUtils;
/**
* Utility class used to instantiate {@link ManageableObjects}
* A ManageableObjects is a Collection or a Map
*
* @author <a href="mailto:christophe.lombart@gmail.com">Christophe Lombart</a>
*
*/
public class ManageableObjectsUtil {
/**
* Instantiate a new {@link ManageableObjects}
* @param manageableObjectsClassName The manageable objects class name
* @return an emtpy created {@link ManageableObjects}
*/
public static ManageableObjects getManageableObjects(String manageableObjectsClassName) {
try {
return (ManageableObjects) ReflectionUtils.newInstance(manageableObjectsClassName);
}
catch (Exception e) {
throw new JcrMappingException("Cannot create manageable collection : "
+ manageableObjectsClassName,
e);
}
}
/**
* Instantiate a new {@link ManageableObjects}
* @param manageableObjectsClass the collection class name
* @return an emtpy created {@link ManageableCollection}
*/
public static ManageableObjects getManageableObjects(Class manageableObjectsClass) {
try {
// if the class is an interface, try to find the default class implementation
if (manageableObjectsClass.isInterface())
{
Class defaultImplementation = ReflectionUtils.getDefaultImplementation(manageableObjectsClass);
if (defaultImplementation == null)
{
throw new JcrMappingException("No default implementation for the interface " + manageableObjectsClass);
}
else
{
manageableObjectsClass = defaultImplementation;
}
}
//if the class is implementing the Collection interface
if (ReflectionUtils.implementsInterface(manageableObjectsClass, Collection.class))
{
return new ManageableCollectionImpl((Collection) ReflectionUtils.newInstance(manageableObjectsClass));
}
//if the class is implementing the Map interface
if (ReflectionUtils.implementsInterface(manageableObjectsClass, Map.class))
{
return new ManageableMapImpl((Map) ReflectionUtils.newInstance(manageableObjectsClass));
}
Object manageableObjects = manageableObjectsClass.newInstance();
if (!(manageableObjects instanceof ManageableObjects)) {
throw new JcrMappingException("Unsupported collection type :"
+ manageableObjectsClass.getName());
}
else {
return (ManageableObjects) manageableObjects;
}
}
catch (Exception e) {
throw new JcrMappingException("Cannot create manageable objects (Collection or Map)", e);
}
}
/**
* Convert a java Collection or a Map into a {@link ManageableObjects}.
*
* The elements of a Map should have an ID field (see the field descriptor definition).
* @param object the collection or the Map objet
* @return The converted {@link ManageableObjects}
*
*/
public static ManageableObjects getManageableObjects(Object object) {
try {
if (object == null) {
return null;
}
if (object instanceof ManageableObjects) {
return (ManageableObjects) object;
}
//if the class is implementing the Collection interface
if (ReflectionUtils.implementsInterface(object.getClass(), Collection.class))
{
return new ManageableCollectionImpl((Collection) object);
}
//if the class is implementing the Map interface
if (ReflectionUtils.implementsInterface(object.getClass(), Map.class))
{
return new ManageableMapImpl((Map) object);
}
}
catch (Exception e) {
throw new JcrMappingException("Impossible to create the manageable collection", e);
}
throw new JcrMappingException("Unsupported collection type :" + object.getClass().getName());
}
}