| /* |
| * 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.mnemonic; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutputStream; |
| import java.nio.ByteBuffer; |
| import java.io.InputStream; |
| |
| /** |
| * a serializer class that manages to serialize any serilizable objects from/to |
| * ByteBuffer. |
| * |
| */ |
| |
| public class ByteBufferSerializer { |
| |
| /** |
| * serialize object to a ByteBuffer object. |
| * |
| * @param <ValueT> |
| * the type of object |
| * |
| * @param obj |
| * specify a object that is serializable |
| * |
| * @throws IOException |
| * the exception of serialization |
| * |
| * @return a ByteBuffer object contained serialized object |
| */ |
| public static <ValueT> ByteBuffer toByteBuffer(ValueT obj) throws IOException { |
| byte[] bytes = null; |
| ByteArrayOutputStream bos = null; |
| ObjectOutputStream oos = null; |
| try { |
| bos = new ByteArrayOutputStream(); |
| oos = new ObjectOutputStream(bos); |
| oos.writeObject(obj); |
| oos.flush(); |
| bytes = bos.toByteArray(); |
| } finally { |
| if (oos != null) { |
| oos.close(); |
| } |
| if (bos != null) { |
| bos.close(); |
| } |
| } |
| return ByteBuffer.wrap(bytes); |
| } |
| |
| /** |
| * de-serialize an object from a ByteBuffer object. |
| * |
| * @param <ValueT> |
| * the type of object |
| * |
| * @param bf |
| * specify an ByteBuffer contains data that can be de-serialized |
| * |
| * @throws IOException |
| * the exception of deserialization |
| * |
| * @throws ClassNotFoundException |
| * Not found class of de-serialized object |
| * |
| * @return a de-serialized object |
| */ |
| @SuppressWarnings("unchecked") |
| public static <ValueT> ValueT toObject(ByteBuffer bf) throws IOException, ClassNotFoundException { |
| Object obj = null; |
| InputStream is = null; |
| ObjectInputStream ois = null; |
| try { |
| is = new ByteBufferBackedInputStream(bf); |
| ois = new ObjectInputStream(is); |
| obj = ois.readObject(); |
| } finally { |
| if (is != null) { |
| is.close(); |
| } |
| if (ois != null) { |
| ois.close(); |
| } |
| } |
| return (ValueT) obj; |
| } |
| |
| /** |
| * serialize object to a MemBufferHolder object. |
| * |
| * @param <A> |
| * the type of bound allocator |
| * |
| * @param <ValueT> |
| * the type of object |
| * |
| * @param ar |
| * specify an Allocator that is used to generate MemBufferHolder |
| * which is backed by a native memory block |
| * |
| * @param obj |
| * specify a object that is serializable |
| * |
| * @throws IOException |
| * the exception of serialization |
| * |
| * @return a MemBufferHolder object contained serialized object |
| */ |
| public static <A extends CommonAllocator<A>, ValueT> MemBufferHolder<A> toMemBufferHolder(A ar, ValueT obj) |
| throws IOException { |
| MemBufferHolder<A> ret = null; |
| ByteBuffer bb = toByteBuffer(obj); |
| if (null != bb && bb.remaining() > 0) { |
| ret = ar.createBuffer(bb.remaining()); |
| ret.get().put(bb); |
| ret.get().flip(); |
| } |
| return ret; |
| } |
| |
| /** |
| * de-serialize an object from a MemBufferHolder object. |
| * |
| * @param <A> |
| * the type of bound allocator |
| * |
| * @param <ValueT> |
| * the type of object |
| * |
| * @param mbh |
| * specify an MemBufferHolder who contains data that can be |
| * de-serialized |
| * |
| * @throws IOException |
| * the exception of deserialization |
| * |
| * @throws ClassNotFoundException |
| * Not found class of de-serialized object |
| * |
| * @return a de-serialized object |
| */ |
| public static <A extends CommonAllocator<A>, ValueT> ValueT fromMemBufferHolder(MemBufferHolder<A> mbh) |
| throws IOException, ClassNotFoundException { |
| return toObject(mbh.get()); |
| } |
| } |