/** | |
* Copyright 2006-2013 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 org.objenesis; | |
import java.util.HashMap; | |
import java.util.Map; | |
import org.objenesis.instantiator.ObjectInstantiator; | |
import org.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 | |
*/ | |
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; | |
} | |
} |