Examples of java.io.ObjectInputStream

java.io.ObjectInputStream
An ObjectInputStream can be used to load Java objects from a stream where the objects were saved using an ObjectOutputStream. Primitive data (ints, bytes, chars, etc) can also be loaded if the data was saved as primitive types as well. It is invalid to attempt to read an object as primitive data. @see ObjectOutputStream @see ObjectInput @see Serializable @see Externalizable


    byte opt = buf[pos++];


    if (opt != Message.NULL) {
      // Reads notification object
      ObjectInputStream ois = null;
      if (compressedFlows) {
        readFully(4);
        int length = readInt();
        
        if (getLogger().isLoggable(BasicLevel.DEBUG))
          getLogger().log(BasicLevel.DEBUG, "readMessage - length=" + length);
        
        byte[] buf = new byte[length];
        int n = 0;
        do {
          int count = read(buf, n, length - n);
          if (count < 0) throw new EOFException();
          n += count;
        } while (n < length);
        ois = new ObjectInputStream(new GZIPInputStream(new ByteArrayInputStream(buf)));
      } else {
        ois = new ObjectInputStream(this);
      }
      
      if (getLogger().isLoggable(BasicLevel.DEBUG))
        getLogger().log(BasicLevel.DEBUG, "readMessage - 2");


      msg.not = (Notification) ois.readObject();
      
      if (getLogger().isLoggable(BasicLevel.DEBUG))
        getLogger().log(BasicLevel.DEBUG, "readMessage - 3");
      
      if (msg.not.expiration > 0)

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  public void react(AgentId from, Notification not) throws Exception {
    if (not instanceof AgentCreateRequest) {
      AgentCreateRequest cnot = (AgentCreateRequest) not;
      try {
        // Restore the new agent state.
        ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(cnot.agentState, 0,
            cnot.agentState.length));
        Agent ag = (Agent) ois.readObject();
        try {
          ois.close();
        } catch (IOException exc) {}


        // Initializes and creates the agent
        // TODO: (ThreadEngine) Thread.currentThread() ...
        AgentServer.engine.createAgent(cnot.deploy, ag);

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      }
      
      FileInputStream fis = null;
      try {
        fis = new FileInputStream(cfgFile);
        ObjectInputStream ois = new ObjectInputStream(fis);
        a3config = (A3CMLConfig) ois.readObject();
      } catch (Exception exc) {
        Log.logger.log(BasicLevel.WARN, "Can't load configuration: " + path, exc);
      } finally {
        if (fis != null) fis.close();
      }


      if (Log.logger.isLoggable(BasicLevel.DEBUG))
        Log.logger.log(BasicLevel.DEBUG,
                       "Config.load : a3cmlconfig = " + a3config);
      return a3config;
    }


    //search a3config in path used to load classes.
    ClassLoader classLoader = null;
    InputStream is = null;
    try {
      classLoader = A3CMLConfig.class.getClassLoader();
      if (classLoader != null) {
        Log.logger.log(BasicLevel.WARN,
                       "Trying to find [" + path + "] using " +
                       classLoader + " class loader.");
        is = classLoader.getResourceAsStream(path);
      }
    } catch(Throwable t) {
      Log.logger.log(BasicLevel.WARN,
                     "Can't find [" + path + "] using " +
                     classLoader + " class loader.", t);
      is = null;
    }
    if (is == null) {
      // Last ditch attempt: get the resource from the system class path.
      Log.logger.log(BasicLevel.WARN,
                     "Trying to find serialized config using ClassLoader.getSystemResource().");
      is = ClassLoader.getSystemResourceAsStream(path);
    }
    if (is != null) {
      ObjectInputStream ois = new ObjectInputStream(is);
      a3config = (A3CMLConfig) ois.readObject();
    }


    if (a3config == null) {
      Log.logger.log(BasicLevel.WARN,
                     "Unable to find configuration file: " + path);

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   */
  public final Object load(String dirName, String name) throws IOException, ClassNotFoundException {
    byte[] buf = loadByteArray(dirName, name);
    if (buf != null) {
      ByteArrayInputStream bis = new ByteArrayInputStream(buf);
      ObjectInputStream ois = new ObjectInputStream(bis);
      try {
        return ois.readObject();
      } finally {
        ois.close();
        bis.close();
      }
    }
    
    return null;

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  public final Object load(String dirName, String name) throws IOException, ClassNotFoundException {
    byte[] buf = loadByteArray(dirName, name);
    if (buf != null) {
      ByteArrayInputStream bis = new ByteArrayInputStream(buf);
      ObjectInputStream ois = new ObjectInputStream(bis);
      try {
        return ois.readObject();
      } finally {
        ois.close();
        bis.close();
      }
    }
    
    return null;

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    }
  } else {
  if (selected.getName().endsWith(".gz")) {
    is = new GZIPInputStream(is);
  }
  ObjectInputStream objectInputStream = new ObjectInputStream(is);
  classifier = (Classifier) objectInputStream.readObject();
  try { // see if we can load the header
    trainHeader = (Instances) objectInputStream.readObject();
  } catch (Exception e) {} // don't fuss if we can't
  objectInputStream.close();
  }
      } catch (Exception e) {
  
  JOptionPane.showMessageDialog(null, e, "Load Failed",
              JOptionPane.ERROR_MESSAGE);

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        final int len = s.readInt();
        final byte[] b = new byte[len];
        s.readFully(b, 0, len);


        FastByteArrayInputStream bis = new FastByteArrayInputStream(b);
        ObjectInputStream ois = new ObjectInputStream(bis);
        this._bodyExpr = (XQExpression) ois.readObject();
        this._bindingVar = (BindingVariable) ois.readObject();


        this._exprBytes = b;
    }

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        out.close();


        final byte[] b = f.toByteArray();


        FastByteArrayInputStream in = new FastByteArrayInputStream(b);
        ObjectInputStream oin = new ObjectInputStream(in);


        Assert.assertEquals(student1, oin.readObject());
        Assert.assertEquals(5, oin.readInt());
        Assert.assertEquals(student2, oin.readObject());


        oin.close();
    }

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        byte[] b2 = out2.toByteArray();
        out.writeInt(b2.length);
        out.write(b2);


        FastByteArrayInputStream bis3 = new FastByteArrayInputStream(b2);
        ObjectInputStream ois3 = new ObjectInputStream(bis3);
        Assert.assertEquals(student2, ois3.readObject());
        Assert.assertEquals(student3, ois3.readObject());


        out.close();


        final byte[] b = f.toByteArray();
        FastByteArrayInputStream in = new FastByteArrayInputStream(b);
        ObjectInputStream oin = new ObjectInputStream(in);


        Assert.assertEquals(student1, oin.readObject());
        Assert.assertEquals(5, oin.readInt());


        int size3 = oin.readInt();
        byte[] b3 = new byte[size3];
        oin.read(b3);
        ArrayAssert.assertEquals(b2, b3);


        FastByteArrayInputStream bis4 = new FastByteArrayInputStream(b3);
        ObjectInputStream ois4 = new ObjectInputStream(bis4);
        Assert.assertEquals(student2, ois4.readObject());
        Assert.assertEquals(student3, ois4.readObject());


        oin.close();
    }

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        PlaceHolder holder1 = new PlaceHolder();
        out.writeObject(holder1);
        out.flush();


        FastByteArrayInputStream bis = new FastByteArrayInputStream(f.getInternalArray(), 0, f.size());
        ObjectInputStream ois = new ObjectInputStream(bis);
        Assert.assertEquals(holder1, ois.readObject());
    }

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