eaglercraft-1.8/sources/main/java/org/apache/commons/lang3/SerializationUtils.java
2022-12-25 01:12:28 -08:00

318 lines
11 KiB
Java

/*
* 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.commons.lang3;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamClass;
import java.io.OutputStream;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import net.lax1dude.eaglercraft.v1_8.EaglerInputStream;
/**
* <p>
* Assists with the serialization process and performs additional functionality
* based on serialization.
* </p>
*
* <ul>
* <li>Deep clone using serialization
* <li>Serialize managing finally and IOException
* <li>Deserialize managing finally and IOException
* </ul>
*
* <p>
* This class throws exceptions for invalid {@code null} inputs. Each method
* documents its behavior in more detail.
* </p>
*
* <p>
* #ThreadSafe#
* </p>
*
* @since 1.0
*/
public class SerializationUtils {
/**
* <p>
* Custom specialization of the standard JDK {@link java.io.ObjectInputStream}
* that uses a custom {@code ClassLoader} to resolve a class. If the specified
* {@code ClassLoader} is not able to resolve the class, the context classloader
* of the current thread will be used. This way, the standard deserialization
* work also in web-application containers and application servers, no matter in
* which of the {@code ClassLoader} the particular class that encapsulates
* serialization/deserialization lives.
* </p>
*
* <p>
* For more in-depth information about the problem for which this class here is
* a workaround, see the JIRA issue LANG-626.
* </p>
*/
static class ClassLoaderAwareObjectInputStream extends ObjectInputStream {
private static final Map<String, Class<?>> primitiveTypes = new HashMap<>();
static {
primitiveTypes.put("byte", byte.class);
primitiveTypes.put("short", short.class);
primitiveTypes.put("int", int.class);
primitiveTypes.put("long", long.class);
primitiveTypes.put("float", float.class);
primitiveTypes.put("double", double.class);
primitiveTypes.put("boolean", boolean.class);
primitiveTypes.put("char", char.class);
primitiveTypes.put("void", void.class);
}
private final ClassLoader classLoader;
/**
* Constructor.
*
* @param in The {@code InputStream}.
* @param classLoader classloader to use
* @throws IOException if an I/O error occurs while reading stream header.
* @see java.io.ObjectInputStream
*/
ClassLoaderAwareObjectInputStream(final InputStream in, final ClassLoader classLoader) throws IOException {
super(in);
this.classLoader = classLoader;
}
/**
* Overridden version that uses the parameterized {@code ClassLoader} or the
* {@code ClassLoader} of the current {@code Thread} to resolve the class.
*
* @param desc An instance of class {@code ObjectStreamClass}.
* @return A {@code Class} object corresponding to {@code desc}.
* @throws IOException Any of the usual Input/Output exceptions.
* @throws ClassNotFoundException If class of a serialized object cannot be
* found.
*/
@Override
protected Class<?> resolveClass(final ObjectStreamClass desc) throws IOException, ClassNotFoundException {
final String name = desc.getName();
try {
return Class.forName(name, false, classLoader);
} catch (final ClassNotFoundException ex) {
try {
return Class.forName(name, false, Thread.currentThread().getContextClassLoader());
} catch (final ClassNotFoundException cnfe) {
final Class<?> cls = primitiveTypes.get(name);
if (cls != null) {
return cls;
}
throw cnfe;
}
}
}
}
/**
* <p>
* Deep clone an {@code Object} using serialization.
* </p>
*
* <p>
* This is many times slower than writing clone methods by hand on all objects
* in your object graph. However, for complex object graphs, or for those that
* don't support deep cloning this can be a simple alternative implementation.
* Of course all the objects must be {@code Serializable}.
* </p>
*
* @param <T> the type of the object involved
* @param object the {@code Serializable} object to clone
* @return the cloned object
* @throws SerializationException (runtime) if the serialization fails
*/
public static <T extends Serializable> T clone(final T object) {
if (object == null) {
return null;
}
final byte[] objectData = serialize(object);
final EaglerInputStream bais = new EaglerInputStream(objectData);
try (ClassLoaderAwareObjectInputStream in = new ClassLoaderAwareObjectInputStream(bais,
object.getClass().getClassLoader())) {
/*
* when we serialize and deserialize an object, it is reasonable to assume the
* deserialized object is of the same type as the original serialized object
*/
@SuppressWarnings("unchecked") // see above
final T readObject = (T) in.readObject();
return readObject;
} catch (final ClassNotFoundException ex) {
throw new SerializationException("ClassNotFoundException while reading cloned object data", ex);
} catch (final IOException ex) {
throw new SerializationException("IOException while reading or closing cloned object data", ex);
}
}
/**
* <p>
* Deserializes a single {@code Object} from an array of bytes.
* </p>
*
* <p>
* If the call site incorrectly types the return value, a
* {@link ClassCastException} is thrown from the call site. Without Generics in
* this declaration, the call site must type cast and can cause the same
* ClassCastException. Note that in both cases, the ClassCastException is in the
* call site, not in this method.
* </p>
*
* @param <T> the object type to be deserialized
* @param objectData the serialized object, must not be null
* @return the deserialized object
* @throws NullPointerException if {@code objectData} is {@code null}
* @throws SerializationException (runtime) if the serialization fails
*/
public static <T> T deserialize(final byte[] objectData) {
Validate.notNull(objectData, "objectData");
return deserialize(new EaglerInputStream(objectData));
}
/**
* <p>
* Deserializes an {@code Object} from the specified stream.
* </p>
*
* <p>
* The stream will be closed once the object is written. This avoids the need
* for a finally clause, and maybe also exception handling, in the application
* code.
* </p>
*
* <p>
* The stream passed in is not buffered internally within this method. This is
* the responsibility of your application if desired.
* </p>
*
* <p>
* If the call site incorrectly types the return value, a
* {@link ClassCastException} is thrown from the call site. Without Generics in
* this declaration, the call site must type cast and can cause the same
* ClassCastException. Note that in both cases, the ClassCastException is in the
* call site, not in this method.
* </p>
*
* @param <T> the object type to be deserialized
* @param inputStream the serialized object input stream, must not be null
* @return the deserialized object
* @throws NullPointerException if {@code inputStream} is {@code null}
* @throws SerializationException (runtime) if the serialization fails
*/
@SuppressWarnings("resource") // inputStream is managed by the caller
public static <T> T deserialize(final InputStream inputStream) {
Validate.notNull(inputStream, "inputStream");
try (ObjectInputStream in = new ObjectInputStream(inputStream)) {
@SuppressWarnings("unchecked")
final T obj = (T) in.readObject();
return obj;
} catch (final ClassNotFoundException | IOException ex) {
throw new SerializationException(ex);
}
}
/**
* Performs a serialization roundtrip. Serializes and deserializes the given
* object, great for testing objects that implement {@link Serializable}.
*
* @param <T> the type of the object involved
* @param obj the object to roundtrip
* @return the serialized and deserialized object
* @since 3.3
*/
@SuppressWarnings("unchecked") // OK, because we serialized a type `T`
public static <T extends Serializable> T roundtrip(final T obj) {
return (T) deserialize(serialize(obj));
}
/**
* <p>
* Serializes an {@code Object} to a byte array for storage/serialization.
* </p>
*
* @param obj the object to serialize to bytes
* @return a byte[] with the converted Serializable
* @throws SerializationException (runtime) if the serialization fails
*/
public static byte[] serialize(final Serializable obj) {
final ByteArrayOutputStream baos = new ByteArrayOutputStream(512);
serialize(obj, baos);
return baos.toByteArray();
}
/**
* <p>
* Serializes an {@code Object} to the specified stream.
* </p>
*
* <p>
* The stream will be closed once the object is written. This avoids the need
* for a finally clause, and maybe also exception handling, in the application
* code.
* </p>
*
* <p>
* The stream passed in is not buffered internally within this method. This is
* the responsibility of your application if desired.
* </p>
*
* @param obj the object to serialize to bytes, may be null
* @param outputStream the stream to write to, must not be null
* @throws NullPointerException if {@code outputStream} is {@code null}
* @throws SerializationException (runtime) if the serialization fails
*/
@SuppressWarnings("resource") // outputStream is managed by the caller
public static void serialize(final Serializable obj, final OutputStream outputStream) {
Validate.notNull(outputStream, "outputStream");
try (ObjectOutputStream out = new ObjectOutputStream(outputStream)) {
out.writeObject(obj);
} catch (final IOException ex) {
throw new SerializationException(ex);
}
}
/**
* <p>
* SerializationUtils instances should NOT be constructed in standard
* programming. Instead, the class should be used as
* {@code SerializationUtils.clone(object)}.
* </p>
*
* <p>
* This constructor is public to permit tools that require a JavaBean instance
* to operate.
* </p>
*
* @since 2.0
*/
public SerializationUtils() {
}
}