/**
* Copyright 2006-2009 the original author or authors.
*
* Licensed 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 ext.jtester.objenesis;
import java.util.HashMap;
import java.util.Map;
import ext.jtester.objenesis.instantiator.ObjectInstantiator;
import ext.jtester.objenesis.strategy.InstantiatorStrategy;
/**
* Base class to extend if you want to have a class providing your own default
* strategy. Can also be instantiated directly.
*
* @author Henri Tremblay
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
public class ObjenesisBase implements Objenesis {
/** Strategy used by this Objenesi implementation to create classes */
protected final InstantiatorStrategy strategy;
/** Strategy cache. Key = Class, Value = InstantiatorStrategy */
protected Map cache;
/**
* Constructor allowing to pick a strategy and using cache
*
* @param strategy
* Strategy to use
*/
public ObjenesisBase(InstantiatorStrategy strategy) {
this(strategy, true);
}
/**
* Flexible constructor allowing to pick the strategy and if caching should
* be used
*
* @param strategy
* Strategy to use
* @param useCache
* If {@link ObjectInstantiator}s should be cached
*/
public ObjenesisBase(InstantiatorStrategy strategy, boolean useCache) {
if (strategy == null) {
throw new IllegalArgumentException("A strategy can't be null");
}
this.strategy = strategy;
this.cache = useCache ? new HashMap() : null;
}
public String toString() {
return getClass().getName() + " using " + strategy.getClass().getName()
+ (cache == null ? " without" : " with") + " caching";
}
/**
* Will create a new object without any constructor being called
*
* @param clazz
* Class to instantiate
* @return New instance of clazz
*/
public Object newInstance(Class clazz) {
return getInstantiatorOf(clazz).newInstance();
}
/**
* Will pick the best instantiator for the provided class. If you need to
* create a lot of instances from the same class, it is way more efficient
* to create them from the same ObjectInstantiator than calling
* {@link #newInstance(Class)}.
*
* @param clazz
* Class to instantiate
* @return Instantiator dedicated to the class
*/
public synchronized ObjectInstantiator getInstantiatorOf(Class clazz) {
if (cache == null) {
return strategy.newInstantiatorOf(clazz);
}
ObjectInstantiator instantiator = (ObjectInstantiator) cache.get(clazz.getName());
if (instantiator == null) {
instantiator = strategy.newInstantiatorOf(clazz);
cache.put(clazz.getName(), instantiator);
}
return instantiator;
}
}