org.apache.coyote.http11.filters

## Class IdentityInputFilter

- java.lang.Object
- - org.apache.coyote.http11.filters.IdentityInputFilter

- All Implemented Interfaces:
    InputFilter, InputBuffer, ApplicationBufferHandler

      public class IdentityInputFilter
      extends Object
      implements InputFilter, ApplicationBufferHandler

  Identity input filter.
  Author:
    Remy Maucherat

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected InputBuffer` | `buffer` Next buffer in the pipeline.
    `protected long` | `contentLength` Content length.
    `protected static ByteChunk` | `ENCODING`
    `protected static String` | `ENCODING_NAME`
    `protected long` | `remaining` Remaining bytes.
    `protected ByteBuffer` | `tempRead` ByteBuffer used to read leftover bytes.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `IdentityInputFilter(int maxSwallowSize)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `int` | `available()` Amount of bytes still available in a buffer.
    `int` | `doRead(ApplicationBufferHandler handler)` Read from the input stream into the ByteBuffer provided by the ApplicationBufferHandler.
    `int` | `doRead(ByteChunk chunk)` Deprecated. Unused. Will be removed in Tomcat 9. Use `doRead(ApplicationBufferHandler)`
    `long` | `end()` End the current request.
    `void` | `expand(int size)`
    `ByteBuffer` | `getByteBuffer()`
    `ByteChunk` | `getEncodingName()` Return the name of the associated encoding; Here, the value is "identity".
    `boolean` | `isFinished()` Has the request body been read fully?
    `void` | `recycle()` Make the filter ready to process the next request.
    `void` | `setBuffer(InputBuffer buffer)` Set the next buffer in the filter pipeline.
    `void` | `setByteBuffer(ByteBuffer buffer)`
    `void` | `setRequest(Request request)` Read the content length from the request.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### ENCODING_NAME

          protected static final String ENCODING_NAME

      See Also:
        Constant Field Values

    - #### ENCODING

          protected static final ByteChunk ENCODING

    - #### contentLength

          protected long contentLength

      Content length.

    - #### remaining

          protected long remaining

      Remaining bytes.

    - #### buffer

          protected InputBuffer buffer

      Next buffer in the pipeline.

    - #### tempRead

          protected ByteBuffer tempRead

      ByteBuffer used to read leftover bytes.

  - ### Constructor Detail

    - #### IdentityInputFilter

          public IdentityInputFilter(int maxSwallowSize)

  - ### Method Detail

    - #### doRead

          @Deprecated
          public int doRead(ByteChunk chunk)
                     throws IOException

      Deprecated. Unused. Will be removed in Tomcat 9. Use `doRead(ApplicationBufferHandler)`
      Description copied from interface: `InputBuffer`
      Read from the input stream into the given buffer. IMPORTANT: the current model assumes that the protocol will 'own' the buffer and return a pointer to it in ByteChunk (i.e. the param will have chunk.getBytes()==null before call, and the result after the call).
      Specified by:
        `doRead` in interface `InputBuffer`
      Parameters:
        `chunk` - The buffer to read data into.
      Returns:
        The number of bytes that have been added to the buffer or -1 for end of stream
      Throws:
        `IOException` - If an I/O error occurs reading from the input stream

    - #### doRead

          public int doRead(ApplicationBufferHandler handler)
                     throws IOException

      Description copied from interface: `InputBuffer`
      Read from the input stream into the ByteBuffer provided by the ApplicationBufferHandler. IMPORTANT: the current model assumes that the protocol will 'own' the ByteBuffer and return a pointer to it.
      Specified by:
        `doRead` in interface `InputBuffer`
      Parameters:
        `handler` - ApplicationBufferHandler that provides the buffer to read data into.
      Returns:
        The number of bytes that have been added to the buffer or -1 for end of stream
      Throws:
        `IOException` - If an I/O error occurs reading from the input stream

    - #### setRequest

          public void setRequest(Request request)

      Read the content length from the request.
      Specified by:
        `setRequest` in interface `InputFilter`
      Parameters:
        `request` - The request to be associated with this filter

    - #### end

          public long end()
                   throws IOException

      Description copied from interface: `InputFilter`
      End the current request.
      Specified by:
        `end` in interface `InputFilter`
      Returns:
        0 is the expected return value. A positive value indicates that too many bytes were read. This method is allowed to use buffer.doRead to consume extra bytes. The result of this method can't be negative (if an error happens, an IOException should be thrown instead).
      Throws:
        `IOException` - If an error happens

    - #### available

          public int available()

      Amount of bytes still available in a buffer.
      Specified by:
        `available` in interface `InputBuffer`
      Returns:
        The number of bytes that can be read without blocking

    - #### setBuffer

          public void setBuffer(InputBuffer buffer)

      Set the next buffer in the filter pipeline.
      Specified by:
        `setBuffer` in interface `InputFilter`
      Parameters:
        `buffer` - The next buffer

    - #### recycle

          public void recycle()

      Make the filter ready to process the next request.
      Specified by:
        `recycle` in interface `InputFilter`

    - #### getEncodingName

          public ByteChunk getEncodingName()

      Return the name of the associated encoding; Here, the value is "identity".
      Specified by:
        `getEncodingName` in interface `InputFilter`
      Returns:
        The encoding name as a byte chunk to facilitate comparison with the value read from the HTTP headers which will also be a ByteChunk

    - #### isFinished

          public boolean isFinished()

      Description copied from interface: `InputFilter`
      Has the request body been read fully?
      Specified by:
        `isFinished` in interface `InputFilter`
      Returns:
        `true` if the request body has been fully read, otherwise `false`

    - #### setByteBuffer

          public void setByteBuffer(ByteBuffer buffer)

      Specified by:
        `setByteBuffer` in interface `ApplicationBufferHandler`

    - #### getByteBuffer

          public ByteBuffer getByteBuffer()

      Specified by:
        `getByteBuffer` in interface `ApplicationBufferHandler`

    - #### expand

          public void expand(int size)

      Specified by:
        `expand` in interface `ApplicationBufferHandler`

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