ResettableObjectInputStream.java

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 * Copyright (c) 2006-2012 Oracle and/or its affiliates. All rights reserved.
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 * The contents of this file are subject to the terms of either the GNU
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 * and Distribution License("CDDL") (collectively, the "License").  You
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 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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package org.glassfish.contextpropagation.wireadapters;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InvalidObjectException;
import java.io.NotActiveException;
import java.io.ObjectInputStream;
import java.io.ObjectInputValidation;

/**
 * An ObjectInputStream implementation with some support for reset method.
 */
public class ResettableObjectInputStream extends ObjectInputStream {
  private static final int READ_LIMIT = 10000;
  BufferedInputStream bis;
  ObjectInputStream underlying;

  public ResettableObjectInputStream(InputStream in) throws IOException {
    bis = new BufferedInputStream(in);
    bis.mark(READ_LIMIT);
    reset();
  }

  @Override
  protected Object readObjectOverride() throws IOException,
      ClassNotFoundException {
    return underlying.readObject();
  }
  
  @Override
  public Object readUnshared() throws IOException, ClassNotFoundException {
    return underlying.readUnshared();
  }

  @Override
  public void defaultReadObject() throws IOException, ClassNotFoundException {
    underlying.defaultReadObject();
  }

  @Override
  public GetField readFields() throws IOException, ClassNotFoundException {
    return underlying.readFields();
  }

  @Override
  public void registerValidation(ObjectInputValidation obj, int prio)
      throws NotActiveException, InvalidObjectException {
    underlying.registerValidation(obj, prio);
  }

  /*@Override
  protected Class<?> resolveClass(ObjectStreamClass desc) throws IOException,
      ClassNotFoundException {

    return underlying.resolveClass(desc);
  }

  @Override
  protected Class<?> resolveProxyClass(String[] interfaces) throws IOException,
      ClassNotFoundException {

    return underlying.resolveProxyClass(interfaces);
  }

  @Override
  protected Object resolveObject(Object obj) throws IOException {

    return underlying.resolveObject(obj);
  }

  @Override
  protected boolean enableResolveObject(boolean enable)
      throws SecurityException {

    return underlying.enableResolveObject(enable);
  }

  @Override
  protected void readStreamHeader() throws IOException,
      StreamCorruptedException {

    underlying.readStreamHeader();
  }

  @Override
  protected ObjectStreamClass readClassDescriptor() throws IOException,
      ClassNotFoundException {

    return underlying.readClassDescriptor();
  }*/

  @Override
  public int read() throws IOException {
    return underlying.read();
  }

  @Override
  public int read(byte[] buf, int off, int len) throws IOException {
    return underlying.read(buf, off, len);
  }

  @Override
  public int available() throws IOException {
    return underlying.available();
  }

  @Override
  public void close() throws IOException {
    underlying.close();
  }

  @Override
  public boolean readBoolean() throws IOException {
    return underlying.readBoolean();
  }

  @Override
  public byte readByte() throws IOException {
    return underlying.readByte();
  }

  @Override
  public int readUnsignedByte() throws IOException {
    return underlying.readUnsignedByte();
  }

  @Override
  public char readChar() throws IOException {
    return underlying.readChar();
  }

  @Override
  public short readShort() throws IOException {
    return underlying.readShort();
  }

  @Override
  public int readUnsignedShort() throws IOException {
    return underlying.readUnsignedShort();
  }

  @Override
  public int readInt() throws IOException {
    return underlying.readInt();
  }

  @Override
  public long readLong() throws IOException {
    return underlying.readLong();
  }

  @Override
  public float readFloat() throws IOException {
    return underlying.readFloat();
  }

  @Override
  public double readDouble() throws IOException {
    return underlying.readDouble();
  }

  @Override
  public void readFully(byte[] buf) throws IOException {
    underlying.readFully(buf);
  }

  @Override
  public void readFully(byte[] buf, int off, int len) throws IOException {
    underlying.readFully(buf, off, len);
  }

  @Override
  public int skipBytes(int len) throws IOException {
    return underlying.skipBytes(len);
  }

  @SuppressWarnings("deprecation")
  @Override
  public String readLine() throws IOException {
    return underlying.readLine();
  }

  @Override
  public String readUTF() throws IOException {
    return underlying.readUTF();
  }

  @Override
  public int read(byte[] b) throws IOException {
    return underlying.read(b);
  }

  @Override
  public long skip(long n) throws IOException {
    return underlying.skip(n);
  }

  @Override
  public synchronized void mark(int readlimit) {
    throw new UnsupportedOperationException("NO-Op this stream allways reset to the 0 position");
  }

  @Override
  public synchronized void reset() throws IOException {
    bis.reset();
    bis.mark(READ_LIMIT);
    underlying = new ObjectInputStream(bis);
  }

  @Override
  public boolean markSupported() {
    return false; // Does not offer full support for mark, but allow reset to original position
  }

  @Override
  public boolean equals(Object obj) {
    return underlying.equals(obj);
  }

  @Override
  public int hashCode() {
    return super.hashCode();
  }

}