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Allow object instantiation without calling the default constructor (#133
) * Allow object deserialization without the default constructor * JUnits for ConfectorySettings added * Add Objenesis optional dependency * Additional Junit test cases * Update ObjectFactory.java
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confectory-core/src/main/java/net/obvj/confectory/util/ObjectFactory.java
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * Copyright 2023 obvj.net | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
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| package net.obvj.confectory.util; | ||
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| import org.apache.commons.lang3.reflect.ConstructorUtils; | ||
| import org.objenesis.ObjenesisStd; | ||
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| /** | ||
| * A factory that encapsulates the logic to reflectively produce new objects depending on | ||
| * the desired strategy. | ||
| * | ||
| * @author oswaldo.bapvic.jr | ||
| * @since 2.5.0 | ||
| */ | ||
| public enum ObjectFactory | ||
| { | ||
| /** | ||
| * Constructor-based object factory. | ||
| * <p> | ||
| * It's safer but requires the existence of a public, default constructor available in the | ||
| * class to allow the instantiation. | ||
| */ | ||
| CLASSIC | ||
| { | ||
| @Override | ||
| public <T> T newObject(Class<T> type) throws ReflectiveOperationException | ||
| { | ||
| return ConstructorUtils.invokeConstructor(type); | ||
| } | ||
| }, | ||
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| /** | ||
| * Object factory that builds objects by allocating an instance directly on the heap, | ||
| * without any constructor being called. | ||
| * <p> | ||
| * Final fields are assigned with | ||
| * <a href="https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html"> | ||
| * default values</a>. | ||
| * <p> | ||
| * <b>Note:</b> This is the default strategy since 2.5.0. | ||
| */ | ||
| UNSAFE | ||
| { | ||
| @Override | ||
| @SuppressWarnings("restriction") | ||
| public <T> T newObject(Class<T> type) throws ReflectiveOperationException | ||
| { | ||
| return type.cast(UnsafeAccessor.UNSAFE.allocateInstance(type)); | ||
| } | ||
| }, | ||
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| /** | ||
| * Alternative object factory that uses a variety of approaches to attempt to instantiate | ||
| * the object, depending on the type of object, JVM version, JVM vendor and Security | ||
| * Manager present. | ||
| * <p> | ||
| * <b>IMPORTANT:</b> This strategy requires the <b>optional dependency</b> | ||
| * {@code org.objenesis:objenesis} in the class path. | ||
| */ | ||
| OBJENESIS | ||
| { | ||
| @Override | ||
| public <T> T newObject(Class<T> type) | ||
| { | ||
| return new ObjenesisStd().newInstance(type); | ||
| } | ||
| }; | ||
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| /** | ||
| * Creates a new instance of the specified class. | ||
| * | ||
| * @param <T> the target type | ||
| * @param type the target type | ||
| * @return a new instance of the specified class | ||
| * | ||
| * @throws ReflectiveOperationException in case of failure during the instantiation | ||
| */ | ||
| public abstract <T> T newObject(Class<T> type) throws ReflectiveOperationException; | ||
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| } |
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