| /** |
| * Copyright 2006-2017 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 org.objenesis.instantiator.ObjectInstantiator; |
| import org.objenesis.strategy.InstantiatorStrategy; |
| |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| /** |
| * 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 ConcurrentHashMap<String, ObjectInstantiator<?>> 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 ConcurrentHashMap<String, ObjectInstantiator<?>>() : null; |
| } |
| |
| @Override |
| 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 <T> T newInstance(Class<T> 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 |
| */ |
| @SuppressWarnings("unchecked") |
| public <T> ObjectInstantiator<T> getInstantiatorOf(Class<T> clazz) { |
| if(clazz.isPrimitive()) { |
| throw new IllegalArgumentException("Primitive types can't be instantiated in Java"); |
| } |
| if(cache == null) { |
| return strategy.newInstantiatorOf(clazz); |
| } |
| ObjectInstantiator<?> instantiator = cache.get(clazz.getName()); |
| if(instantiator == null) { |
| ObjectInstantiator<?> newInstantiator = strategy.newInstantiatorOf(clazz); |
| instantiator = cache.putIfAbsent(clazz.getName(), newInstantiator); |
| if(instantiator == null) { |
| instantiator = newInstantiator; |
| } |
| } |
| return (ObjectInstantiator<T>) instantiator; |
| } |
| } |