/*
 * Copyright (c) 2000, 2020 Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2020 Contributors to the Eclipse Foundation
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package com.sun.messaging.jms.ra;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.EOFException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import jakarta.jms.JMSException;
import jakarta.jms.MessageEOFException;
import jakarta.jms.MessageFormatException;
import jakarta.jms.MessageNotReadableException;
import jakarta.jms.MessageNotWriteableException;

import com.sun.messaging.jmq.io.JMSPacket;
import com.sun.messaging.jmq.io.PacketType;
import com.sun.messaging.jmq.util.io.FilteringObjectInputStream;

/**
 * A <CODE>StreamMessage</CODE> object is used to send a stream of primitive types in the Java programming language. It
 * is filled and read sequentially. It inherits from the <CODE>Message</CODE> interface and adds a stream message body.
 * Its methods are based largely on those found in <CODE>java.io.DataInputStream</CODE> and
 * <CODE>java.io.DataOutputStream</CODE>.
 *
 * <P>
 * The primitive types can be read or written explicitly using methods for each type. They may also be read or written
 * generically as objects. For instance, a call to <CODE>StreamMessage.writeInt(6)</CODE> is equivalent to
 * <CODE>StreamMessage.writeObject(new Integer(6))</CODE>. Both forms are provided, because the explicit form is
 * convenient for static programming, and the object form is needed when types are not known at compile time.
 *
 * <P>
 * When the message is first created, and when <CODE>clearBody</CODE> is called, the body of the message is in
 * write-only mode. After the first call to <CODE>reset</CODE> has been made, the message body is in read-only mode.
 * After a message has been sent, the client that sent it can retain and modify it without affecting the message that
 * has been sent. The same message object can be sent multiple times. When a message has been received, the provider has
 * called <CODE>reset</CODE> so that the message body is in read-only mode for the client.
 * 
 * <P>
 * If <CODE>clearBody</CODE> is called on a message in read-only mode, the message body is cleared and the message body
 * is in write-only mode.
 * 
 * <P>
 * If a client attempts to read a message in write-only mode, a <CODE>MessageNotReadableException</CODE> is thrown.
 * 
 * <P>
 * If a client attempts to write a message in read-only mode, a <CODE>MessageNotWriteableException</CODE> is thrown.
 *
 * <P>
 * <CODE>StreamMessage</CODE> objects support the following conversion table. The marked cases must be supported. The
 * unmarked cases must throw a <CODE>JMSException</CODE>. The <CODE>String</CODE>-to-primitive conversions may throw a
 * runtime exception if the primitive's <CODE>valueOf()</CODE> method does not accept it as a valid <CODE>String</CODE>
 * representation of the primitive.
 *
 * <P>
 * A value written as the row type can be read as the column type.
 *
 * <PRE>
 *  |        | boolean byte short char int long float double String byte[]
 *  |----------------------------------------------------------------------
 *  |boolean |    X                                            X
 *  |byte    |          X     X         X   X                  X   
 *  |short   |                X         X   X                  X   
 *  |char    |                     X                           X
 *  |int     |                          X   X                  X   
 *  |long    |                              X                  X   
 *  |float   |                                    X     X      X   
 *  |double  |                                          X      X   
 *  |String  |    X     X     X         X   X     X     X      X   
 *  |byte[]  |                                                        X
 *  |----------------------------------------------------------------------
 * </PRE>
 *
 * <P>
 * Attempting to read a null value as a primitive type must be treated as calling the primitive's corresponding
 * <code>valueOf(String)</code> conversion method with a null value. Since <code>char</code> does not support a
 * <code>String</code> conversion, attempting to read a null value as a <code>char</code> must throw a
 * <code>NullPointerException</code>.
 *
 * @see jakarta.jms.Session#createStreamMessage()
 * @see jakarta.jms.BytesMessage
 * @see jakarta.jms.MapMessage
 * @see jakarta.jms.Message
 * @see jakarta.jms.ObjectMessage
 * @see jakarta.jms.TextMessage
 */
public class DirectStreamPacket extends DirectPacket implements jakarta.jms.StreamMessage {

    private byte[] messageBody = null;

    private ByteArrayOutputStream byteArrayOutputStream = null;
    private ObjectOutputStream objectOutputStream = null;

    private ByteArrayInputStream byteArrayInputStream = null;
    private ObjectInputStream objectInputStream = null;

    /** Indicates whether this JMS BytesMessage has been written to or not */
    private boolean writePerformed = false;

    /**
     * Flag to indicate readBytes (byte[] buf) call status.
     */
    private boolean byteArrayReadState = false;

    // for byte array field only
    private ByteArrayInputStream byteArrayFieldInputStream = null;

    /**
     *
     */
    private Object notYetProcessedPrimitiveObject = null;

    /**
     * Logging
     */
    private static transient final String _className = "com.sun.messaging.jms.ra.DirectStreamPacket";

    /**
     * Create a new instance of DirectStreamPacket.
     * <p>
     *
     * Used by the createStreamMessage API
     */
    public DirectStreamPacket(DirectSession ds) throws JMSException {
        super(ds);
        if (_logFINE) {
            Object params[] = new Object[2];
            params[0] = ds;
            _loggerOC.entering(_className, "constructor()", params);
        }
        this._initializeOutputStreams();
    }

    public DirectStreamPacket(JMSPacket jmsPacket, long consumerId, DirectSession ds) throws JMSException {
        super(jmsPacket, consumerId, ds);
        this._getMessageBodyFromPacket();
    }

    /////////////////////////////////////////////////////////////////////////
    // methods that implement jakarta.jms.StreamMessage
    /////////////////////////////////////////////////////////////////////////
    /**
     * Clear out the message body .
     */
    @Override
    public void clearBody() throws JMSException {
        super.clearBody();
        this.messageBody = null;
        this._initializeOutputStreams();
    }

    /**
     * Read a <code>boolean</code> from the stream message.
     *
     * @return The <code>boolean</code> value read
     *
     * @throws JMSException if the JMS provider fails to read the message due to some internal error.
     * @throws MessageEOFException if unexpected end of message stream has been reached.
     * @throws MessageFormatException if this type conversion is invalid.
     * @throws MessageNotReadableException if the message is in write-only mode.
     */
    @Override
    public boolean readBoolean() throws JMSException {
        Object obj = this._readPrimitiveObject("readBoolean()");
        return ConvertValue.toBoolean(obj);
    }

    /**
     * Reads a <code>byte</code> value from the stream message.
     *
     * @return the next byte from the stream message as a 8-bit <code>byte</code>
     *
     * @exception JMSException if the JMS provider fails to read the message due to some internal error.
     * @exception MessageEOFException if unexpected end of message stream has been reached.
     * @exception MessageFormatException if this type conversion is invalid.
     * @exception MessageNotReadableException if the message is in write-only mode.
     */
    @Override
    public byte readByte() throws JMSException {
        Object obj = this._readPrimitiveObject("readByte()");
        try {
            byte b = ConvertValue.toByte(obj);
            return b;
        } catch (NumberFormatException nfe) {
            notYetProcessedPrimitiveObject = obj;
            throw nfe;
        }
    }

    /**
     * Reads a byte array field from the stream message into the specified <CODE>byte[]</CODE> object (the read buffer).
     * 
     * <P>
     * To read the field value, <CODE>readBytes</CODE> should be successively called until it returns a value less than the
     * length of the read buffer. The value of the bytes in the buffer following the last byte read is undefined.
     * 
     * <P>
     * If <CODE>readBytes</CODE> returns a value equal to the length of the buffer, a subsequent <CODE>readBytes</CODE> call
     * must be made. If there are no more bytes to be read, this call returns -1.
     * 
     * <P>
     * If the byte array field value is null, <CODE>readBytes</CODE> returns -1.
     *
     * <P>
     * If the byte array field value is empty, <CODE>readBytes</CODE> returns 0.
     * 
     * <P>
     * Once the first <CODE>readBytes</CODE> call on a <CODE>byte[]</CODE> field value has been made, the full value of the
     * field must be read before it is valid to read the next field. An attempt to read the next field before that has been
     * done will throw a <CODE>MessageFormatException</CODE>.
     * 
     * <P>
     * To read the byte field value into a new <CODE>byte[]</CODE> object, use the <CODE>readObject</CODE> method.
     *
     * @param value the buffer into which the data is read
     *
     * @return the total number of bytes read into the buffer, or -1 if there is no more data because the end of the byte
     * field has been reached
     *
     * @exception JMSException if the JMS provider fails to read the message due to some internal error.
     * @exception MessageEOFException if unexpected end of message stream has been reached.
     * @exception MessageFormatException if this type conversion is invalid.
     * @exception MessageNotReadableException if the message is in write-only mode.
     * 
     * @see #readObject()
     */
    @Override
    public int readBytes(byte[] value) throws JMSException {
        int bytesRead = -1;

        /**
         * No message body in the stream message.
         */
        if (this.messageBody == null) {
            this.checkForWriteOnlyMessageBody("readBytes(byte[])");
            return -1;
        }

        if (byteArrayReadState == false) {
            Object obj = this._readPrimitiveObject("readBytes(byte[])");
            if (obj == null) {
                return -1;
            }

            // throws MessageFormatException if not byte[] type
            if ((obj instanceof byte[]) == false) {
                String errorString = "Exception:StreamMessage:readBytes():" + "Object read is not byte[]:Actual type=" + obj.getClass().getName();
                throw new MessageFormatException(errorString);
            }

            // cast to byte[]
            byte[] data = (byte[]) obj;

            /**
             * For empty byte[], the spec says to return 0
             */
            if (data.length == 0) {
                return 0;
            }

            // construct new input stream
            byteArrayFieldInputStream = new ByteArrayInputStream(data);

            /**
             * set flag to true so that no other read may be called
             */
            byteArrayReadState = true;
        }

        // read bytes from byte array stream
        bytesRead = byteArrayFieldInputStream.read(value, 0, value.length);

        if (bytesRead < value.length) {
            /**
             * Reset flag so that user can call other readXXX method.
             */
            byteArrayReadState = false;
            try {
                byteArrayFieldInputStream.close();
                byteArrayFieldInputStream = null;
            } catch (IOException e) {
                JMSException jmse = new JMSException("Exception:" + "StreamMessage:readBytes()" + e.getMessage());
                jmse.initCause(e);
                throw jmse;
            }
        }
        return bytesRead;
    }

    /**
     * Reads a Unicode character value from the stream message.
     *
     * @return a Unicode character from the stream message
     *
     * @exception JMSException if the JMS provider fails to read the message due to some internal error.
     * @exception MessageEOFException if unexpected end of message stream has been reached.
     * @exception MessageFormatException if this type conversion is invalid
     * @exception MessageNotReadableException if the message is in write-only mode.
     */
    @Override
    public char readChar() throws JMSException {
        Object obj = this._readPrimitiveObject("readChar()");
        return ConvertValue.toChar(obj);
    }

    /**
     * Reads a <code>double</code> from the stream message.
     *
     * @return a <code>double</code> value from the stream message
     *
     * @exception JMSException if the JMS provider fails to read the message due to some internal error.
     * @exception MessageEOFException if unexpected end of message stream has been reached.
     * @exception MessageFormatException if this type conversion is invalid.
     * @exception MessageNotReadableException if the message is in write-only mode.
     */
    @Override
    public double readDouble() throws JMSException {
        Object obj = this._readPrimitiveObject("readDouble()");
        return ConvertValue.toDouble(obj);
    }

    /**
     * Reads a <code>float</code> from the stream message.
     *
     * @return a <code>float</code> value from the stream message
     *
     * @exception JMSException if the JMS provider fails to read the message due to some internal error.
     * @exception MessageEOFException if unexpected end of message stream has been reached.
     * @exception MessageFormatException if this type conversion is invalid.
     * @exception MessageNotReadableException if the message is in write-only mode.
     */
    @Override
    public float readFloat() throws JMSException {
        Object obj = this._readPrimitiveObject("readFloat()");
        return ConvertValue.toFloat(obj);
    }

    /**
     * Reads a 32-bit integer from the stream message.
     *
     * @return a 32-bit integer value from the stream message, interpreted as an <code>int</code>
     *
     * @exception JMSException if the JMS provider fails to read the message due to some internal error.
     * @exception MessageEOFException if unexpected end of message stream has been reached.
     * @exception MessageFormatException if this type conversion is invalid.
     * @exception MessageNotReadableException if the message is in write-only mode.
     */
    @Override
    public int readInt() throws JMSException {
        Object obj = this._readPrimitiveObject("readInt()");
        return ConvertValue.toInt(obj);
    }

    /**
     * Reads a 64-bit integer from the stream message.
     *
     * @return a 64-bit integer value from the stream message, interpreted as a <code>long</code>
     *
     * @exception JMSException if the JMS provider fails to read the message due to some internal error.
     * @exception MessageEOFException if unexpected end of message stream has been reached.
     * @exception MessageFormatException if this type conversion is invalid.
     * @exception MessageNotReadableException if the message is in write-only mode.
     */
    @Override
    public long readLong() throws JMSException {
        Object obj = this._readPrimitiveObject("readLong()");
        return ConvertValue.toLong(obj);
    }

    /**
     * Reads an object from the stream message.
     *
     * <P>
     * This method can be used to return, in objectified format, an object in the Java programming language ("Java object")
     * that has been written to the stream with the equivalent <CODE>writeObject</CODE> method call, or its equivalent
     * primitive <CODE>write<I>type</I></CODE> method.
     * 
     * <P>
     * Note that byte values are returned as <CODE>byte[]</CODE>, not <CODE>Byte[]</CODE>.
     *
     * <P>
     * An attempt to call <CODE>readObject</CODE> to read a byte field value into a new <CODE>byte[]</CODE> object before
     * the full value of the byte field has been read will throw a <CODE>MessageFormatException</CODE>.
     *
     * @return a Java object from the stream message, in objectified format (for example, if the object was written as an
     * <CODE>int</CODE>, an <CODE>Integer</CODE> is returned)
     *
     * @exception JMSException if the JMS provider fails to read the message due to some internal error.
     * @exception MessageEOFException if unexpected end of message stream has been reached.
     * @exception MessageFormatException if this type conversion is invalid.
     * @exception MessageNotReadableException if the message is in write-only mode.
     * 
     * @see #readBytes(byte[] value)
     */
    @Override
    public Object readObject() throws JMSException {
        Object obj = this._readPrimitiveObject("readObject()");
        return obj;
    }

    /**
     * Reads a 16-bit integer from the stream message.
     *
     * @return a 16-bit integer from the stream message
     *
     * @exception JMSException if the JMS provider fails to read the message due to some internal error.
     * @exception MessageEOFException if unexpected end of message stream has been reached.
     * @exception MessageFormatException if this type conversion is invalid.
     * @exception MessageNotReadableException if the message is in write-only mode.
     */
    @Override
    public short readShort() throws JMSException {
        Object obj = this._readPrimitiveObject("readShort()");
        return ConvertValue.toShort(obj);
    }

    /**
     * Reads a <CODE>String</CODE> from the stream message.
     *
     * @return a Unicode string from the stream message
     *
     * @exception JMSException if the JMS provider fails to read the message due to some internal error.
     * @exception MessageEOFException if unexpected end of message stream has been reached.
     * @exception MessageFormatException if this type conversion is invalid.
     * @exception MessageNotReadableException if the message is in write-only mode.
     */
    @Override
    public String readString() throws JMSException {
        Object obj = this._readPrimitiveObject("readString()");
        return ConvertValue.toString(obj);
    }

    /**
     * Puts the message body in read-only mode and repositions the stream to the beginning.
     * 
     * @exception JMSException if the JMS provider fails to reset the message due to some internal error.
     * @exception MessageFormatException if the message has an invalid format.
     */
    @Override
    public void reset() throws JMSException {
        String methodName = "reset()";
        if (_logFINE) {
            _loggerJM.fine(_lgrMID_INF + /* "messageId="+messageId+":"+ */
                    methodName);
        }
        this._reset(methodName);
    }

    /**
     * Writes a <code>boolean</code> to the stream message. The value <code>true</code> is written as the value
     * <code>(byte)1</code>; the value <code>false</code> is written as the value <code>(byte)0</code>.
     *
     * @param value the <code>boolean</code> value to be written
     *
     * @exception JMSException if the JMS provider fails to write the message due to some internal error.
     * @exception MessageNotWriteableException if the message is in read-only mode.
     */
    @Override
    public void writeBoolean(boolean value) throws JMSException {
        this._writePrimitiveObject(value, "writeBoolean()");
    }

    /**
     * Writes a <code>byte</code> to the stream message.
     *
     * @param value the <code>byte</code> value to be written
     *
     * @exception JMSException if the JMS provider fails to write the message due to some internal error.
     * @exception MessageNotWriteableException if the message is in read-only mode.
     */
    @Override
    public void writeByte(byte value) throws JMSException {
        this._writePrimitiveObject(value, "writeByte()");
    }

    /**
     * Writes a byte array field to the stream message.
     *
     * <P>
     * The byte array <code>value</code> is written to the message as a byte array field. Consecutively written byte array
     * fields are treated as two distinct fields when the fields are read.
     * 
     * @param value the byte array value to be written
     *
     * @exception JMSException if the JMS provider fails to write the message due to some internal error.
     * @exception MessageNotWriteableException if the message is in read-only mode.
     */
    @Override
    public void writeBytes(byte[] value) throws JMSException {
        this._writePrimitiveObject(value, "writeBytes(byte[])");
    }

    /**
     * Writes a portion of a byte array as a byte array field to the stream message.
     * 
     * <P>
     * The a portion of the byte array <code>value</code> is written to the message as a byte array field. Consecutively
     * written byte array fields are treated as two distinct fields when the fields are read.
     *
     * @param value the byte array value to be written
     * @param offset the initial offset within the byte array
     * @param length the number of bytes to use
     *
     * @exception JMSException if the JMS provider fails to write the message due to some internal error.
     * @exception MessageNotWriteableException if the message is in read-only mode.
     */
    @Override
    public void writeBytes(byte[] value, int offset, int length) throws JMSException {
        byte[] out = new byte[length];
        System.arraycopy(value, offset, out, 0, length);
        this._writePrimitiveObject(out, "writeBytes(byte[], offset, length)");
    }

    /**
     * Writes a <code>char</code> to the stream message.
     *
     * @param value the <code>char</code> value to be written
     *
     * @exception JMSException if the JMS provider fails to write the message due to some internal error.
     * @exception MessageNotWriteableException if the message is in read-only mode.
     */
    @Override
    public void writeChar(char value) throws JMSException {
        this._writePrimitiveObject(value, "writeChar()");
    }

    /**
     * Writes a <code>double</code> to the stream message.
     *
     * @param value the <code>double</code> value to be written
     *
     * @exception JMSException if the JMS provider fails to write the message due to some internal error.
     * @exception MessageNotWriteableException if the message is in read-only mode.
     */
    @Override
    public void writeDouble(double value) throws JMSException {
        this._writePrimitiveObject(value, "writeDouble()");
    }

    /**
     * Writes a <code>float</code> to the stream message.
     *
     * @param value the <code>float</code> value to be written
     *
     * @exception JMSException if the JMS provider fails to write the message due to some internal error.
     * @exception MessageNotWriteableException if the message is in read-only mode.
     */
    @Override
    public void writeFloat(float value) throws JMSException {
        this._writePrimitiveObject(value, "writeFloat()");
    }

    /**
     * Writes an <code>int</code> to the stream message.
     *
     * @param value the <code>int</code> value to be written
     *
     * @exception JMSException if the JMS provider fails to write the message due to some internal error.
     * @exception MessageNotWriteableException if the message is in read-only mode.
     */
    @Override
    public void writeInt(int value) throws JMSException {
        this._writePrimitiveObject(value, "writeInt()");
    }

    /**
     * Writes a <code>long</code> to the stream message.
     *
     * @param value the <code>long</code> value to be written
     *
     * @exception JMSException if the JMS provider fails to write the message due to some internal error.
     * @exception MessageNotWriteableException if the message is in read-only mode.
     */
    @Override
    public void writeLong(long value) throws JMSException {
        this._writePrimitiveObject(value, "writeLong()");
    }

    /**
     * Writes an object to the stream message.
     *
     * <P>
     * This method works only for the objectified primitive object types (<code>Integer</code>, <code>Double</code>,
     * <code>Long</code>&nbsp;...), <code>String</code> objects, and byte arrays.
     *
     * @param value the Java object to be written
     *
     * @exception JMSException if the JMS provider fails to write the message due to some internal error.
     * @exception MessageFormatException if the object is invalid.
     * @exception MessageNotWriteableException if the message is in read-only mode.
     */
    @Override
    public void writeObject(Object value) throws JMSException {
        this._checkValidObjectType(value, "writeObject()");
        this._writePrimitiveObject(value, "writeObject()");
    }

    /**
     * Writes a <code>short</code> to the stream message.
     *
     * @param value the <code>short</code> value to be written
     *
     * @exception JMSException if the JMS provider fails to write the message due to some internal error.
     * @exception MessageNotWriteableException if the message is in read-only mode.
     */
    @Override
    public void writeShort(short value) throws JMSException {
        this._writePrimitiveObject(value, "writeShort()");
    }

    /**
     * Writes a <code>String</code> to the stream message.
     *
     * @param value the <code>String</code> value to be written
     *
     * @exception JMSException if the JMS provider fails to write the message due to some internal error.
     * @exception MessageNotWriteableException if the message is in read-only mode.
     */
    @Override
    public void writeString(String value) throws JMSException {
        this._writePrimitiveObject(value, "writeString()");
    }

    /////////////////////////////////////////////////////////////////////////
    // end jakarta.jms.StreamMessage
    /////////////////////////////////////////////////////////////////////////
    /////////////////////////////////////////////////////////////////////////
    // MQ methods DirectBytesPacket / jakarta.jms.StreamMessage
    /////////////////////////////////////////////////////////////////////////
    /**
     * Set the JMS default values on this JMS StreamsMessage
     */
    @Override
    protected void _setDefaultValues() throws JMSException {
        super._setDefaultValues();
        this.pkt.setPacketType(PacketType.STREAM_MESSAGE);
    }

    /**
     * Set the JMS Message body into the packet
     */
    @Override
    protected void _setBodyToPacket() throws JMSException {
        this._reset("_setBodyToPacket");
        if (this.messageBody != null) {
            try {
                super._setMessageBodyOfPacket(this.messageBody, 0, this.messageBody.length);
            } catch (Exception ex) {
                String errMsg = _lgrMID_EXC + ":ERROR setting StreamMessage body" + ":Exception=" + ex.getMessage();
                _loggerJM.severe(errMsg);
                JMSException jmse = new jakarta.jms.JMSException(errMsg);
                jmse.initCause(ex);
                throw jmse;
            }
        }
    }

    /**
     * Get the message body from the packet
     */
    @Override
    protected void _getMessageBodyFromPacket() throws JMSException {
        this.messageBody = super._getMessageBodyByteArray();
        this._reset("_getMessageBodyFromPacket");
    }

    /**
     * Reset method for private use
     */
    private void _reset(String methodName) throws JMSException {
        super._setReadOnlyBody(true);
        try {
            if (this.writePerformed) {
                this.objectOutputStream.flush();
                this.messageBody = this.byteArrayOutputStream.toByteArray();

                this.objectOutputStream.close();
                this.byteArrayOutputStream.close();
                this.writePerformed = false;
            }
            if (this.messageBody != null) {
                this.byteArrayInputStream = new ByteArrayInputStream(this.messageBody);
                this.objectInputStream = new FilteringObjectInputStream(this.byteArrayInputStream);
            }
        } catch (Exception e) {
            String errMsg = _lgrMID_EXC + ":Exception:StreamMessage." + methodName + ":message=" + e.getMessage();
            _loggerJM.severe(errMsg);
            JMSException jmse = new jakarta.jms.JMSException(errMsg);
            jmse.initCause(e);
            throw jmse;
        }
        // reset flag
        this.byteArrayReadState = false;
        this.notYetProcessedPrimitiveObject = null;
    }

    /**
     * Read a primitive object from the StreamMessage body
     */
    private Object _readPrimitiveObject(String methodName) throws JMSException {
        Object obj = null;
        this.checkForWriteOnlyMessageBody(methodName);
        this._checkReadBytesState(methodName);
        try {
            if (this.notYetProcessedPrimitiveObject != null) {
                obj = this.notYetProcessedPrimitiveObject;
                this.notYetProcessedPrimitiveObject = null;
            } else {
                obj = this.objectInputStream.readObject();
            }
        } catch (EOFException eofe) {
            MessageEOFException meofe = new MessageEOFException("Unexpected EOFException: " + eofe.getMessage());
            throw meofe;
        } catch (Exception e) {
            JMSException jmse = new JMSException("Exception on readObject:" + e.getMessage());
            jmse.initCause(e);
            throw jmse;
        }
        return obj;
    }

    /**
     * Write an object to the StreamMessage body
     */
    private void _writePrimitiveObject(Object obj, String methodName) throws JMSException {
        this.checkForReadOnlyMessageBody(methodName);
        try {
            this.objectOutputStream.writeObject(obj);
        } catch (Exception e) {
            String errMsg = _lgrMID_EXC + ":Exception:StreamMessage." + methodName + ":message=" + e.getMessage();
            _loggerJM.severe(errMsg);
            JMSException jmse = new jakarta.jms.JMSException(errMsg);
            jmse.initCause(e);
            throw jmse;
        }
        this.writePerformed = true;
    }

    /**
     * Check the read bytes state.
     * <p>
     *
     * Called by every readXXXX() method except readBytes
     *
     * @throws MessageFormatException if byteArrayReadState state is true.
     */
    private void _checkReadBytesState(String methodName) throws MessageFormatException {
        if (this.byteArrayReadState) {
            throw new MessageFormatException("MessageFormatException on" + methodName);
        }
    }

    /**
     * } Initialize buffers for output
     */
    private void _initializeOutputStreams() throws JMSException {
        try {
            this.byteArrayOutputStream = new ByteArrayOutputStream();
            this.objectOutputStream = new ObjectOutputStream(byteArrayOutputStream);
        } catch (Exception e) {
            JMSException jmse = new JMSException("Exception:" + "StreamMessage:initializing output streams:" + e.getMessage());
            jmse.initCause(e);
            throw jmse;
        }
    }

    private void _checkValidObjectType(Object value, String name) throws MessageFormatException {
        if (value == null) {
            return;
        }
        if (value instanceof Boolean || value instanceof Byte || value instanceof Short || value instanceof Character || value instanceof Integer
                || value instanceof Long || value instanceof Float || value instanceof Double || value instanceof String || value instanceof byte[]) {
            // valid
        } else {
            String errMsg = _lgrMID_EXC + ":StreamMessage:setObject():Invalid type" + ":name=" + name + ":type=" + value.getClass().getName();
            _loggerJM.severe(errMsg);
            MessageFormatException mfe = new MessageFormatException(errMsg);
            throw mfe;
        }
    }
}
