## net.i2p.data.i2np
Class DataMessage

    java.lang.Object
      net.i2p.data.DataStructureImpl
          net.i2p.data.i2np.I2NPMessageImpl
              net.i2p.data.i2np.DataMessage

All Implemented Interfaces:
  DataStructure, I2NPMessage

public class DataMessage
extends I2NPMessageImpl

Defines a message containing arbitrary bytes of data

Author:
  jrandom

Nested Class Summary

Nested classes inherited from class net.i2p.data.i2np.I2NPMessageImpl
`I2NPMessageImpl.Builder`

Field Summary
`static int` `MESSAGE_TYPE`

Fields inherited from class net.i2p.data.i2np.I2NPMessageImpl
`_context, CHECKSUM_LENGTH, DEFAULT_EXPIRATION_MS`

Fields inherited from interface net.i2p.data.i2np.I2NPMessage
`MAX_ID_VALUE`

Constructor Summary
`DataMessage(I2PAppContext context)`

Method Summary
`protected int` `calculateWrittenLength()` calculate the message body's length (not including the header and footer
`boolean` `equals(java.lang.Object object)`
`byte[]` `getData()`
`int` `getSize()`
`int` `getType()` Return the unique identifier for this type of I2NP message, as defined in the I2NP spec
`int` `hashCode()`
`void` `readMessage(byte[] data, int offset, int dataSize, int type)` Read the body into the data structures, after the initial type byte and the uniqueId / expiration, using the current class's format as defined by the I2NP specification
`void` `setData(byte[] data)`
`java.lang.String` `toString()`
`protected int` `writeMessageBody(byte[] out, int curIndex)` write the message body to the output array, starting at the given index
`protected void` `written()`

Methods inherited from class net.i2p.data.i2np.I2NPMessageImpl
`createMessage, fromRawByteArray, fromRawByteArray, getMessageExpiration, getMessageSize, getRawMessageSize, getUniqueId, read, readBytes, readBytes, readBytes, readMessage, registerBuilder, setMessageExpiration, setUniqueId, toByteArray, toByteArray, toRawByteArray, verifyUnwritten, writeBytes`

Methods inherited from class net.i2p.data.DataStructureImpl
`calculateHash, fromBase64, fromByteArray, read, toBase64`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Methods inherited from interface net.i2p.data.DataStructure
`calculateHash, fromBase64, fromByteArray, toBase64`

Field Detail

### MESSAGE_TYPE

    public static final int MESSAGE_TYPE

See Also:
  Constant Field Values

Constructor Detail

### DataMessage

    public DataMessage(I2PAppContext context)

Method Detail

### getData

    public byte[] getData()

### setData

    public void setData(byte[] data)

### getSize

    public int getSize()

### readMessage

    public void readMessage(byte[] data,
                            int offset,
                            int dataSize,
                            int type)
                     throws I2NPMessageException,
                            java.io.IOException

  Description copied from interface: `I2NPMessage`
  Read the body into the data structures, after the initial type byte and the uniqueId / expiration, using the current class's format as defined by the I2NP specification

  Parameters:
    `data` - data to read from
    `offset` - where to start in the data array
    `dataSize` - how long into the data to read
    `type` - I2NP message type
  Throws:
    `java.io.IOException` - if there is a problem reading from the stream
    `I2NPMessageException` - if the stream doesn't contain a valid message that this class can read.

### calculateWrittenLength

    protected int calculateWrittenLength()

  calculate the message body's length (not including the header and footer

  Specified by:
    `calculateWrittenLength` in class `I2NPMessageImpl`

### writeMessageBody

    protected int writeMessageBody(byte[] out,
                                   int curIndex)

  write the message body to the output array, starting at the given index

  Specified by:
    `writeMessageBody` in class `I2NPMessageImpl`
  Returns:
    the index into the array after the last byte written

### written

    protected void written()

  Overrides:
    `written` in class `I2NPMessageImpl`

### getType

    public int getType()

  Description copied from interface: `I2NPMessage`
  Return the unique identifier for this type of I2NP message, as defined in the I2NP spec

### hashCode

    public int hashCode()

### equals

    public boolean equals(java.lang.Object object)

### toString

    public java.lang.String toString()