org.apache.cxf.transport.common.gzip

## Class GZIPOutInterceptor

- java.lang.Object
- - org.apache.cxf.phase.AbstractPhaseInterceptor<Message>
  - - org.apache.cxf.transport.common.gzip.GZIPOutInterceptor

- All Implemented Interfaces:
    Interceptor<Message>, PhaseInterceptor<Message>

      public class GZIPOutInterceptor
      extends AbstractPhaseInterceptor<Message>

  CXF interceptor that compresses outgoing messages using gzip and sets the HTTP Content-Encoding header appropriately. An instance of this class should be added as an out interceptor on clients that need to talk to a service that accepts gzip-encoded requests or on a service that wants to be able to return compressed responses. In server mode, the interceptor only compresses responses if the client indicated (via an Accept-Encoding header on the request) that it can understand them. To handle gzip-encoded input messages, see `GZIPInInterceptor`. This interceptor supports a compression `threshold` (default 1kB) - messages smaller than this threshold will not be compressed. To force compression of all messages, set the threshold to 0. This class was originally based on one of the CXF samples (configuration_interceptor).

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `GZIPOutInterceptor.UseGzip` Enum giving the possible values for whether we should gzip a particular message.

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static Pattern` | `ENCODINGS` regular expression which can split encodings
    `static String` | `GZIP_ENCODING_KEY` Key under which we store the name which should be used for the content-encoding of the outgoing message.
    `static String` | `ORIGINAL_OUTPUT_STREAM_KEY` Key under which we store the original output stream on the message, for use by the ending interceptor.
    `static String` | `SOAP_JMS_CONTENTENCODING`
    `static String` | `USE_GZIP_KEY` Key under which we store an indication of whether compression is permitted or required, for use by the ending interceptor.
    `static Pattern` | `ZERO_Q` regular expression that matches any encoding with a q-value of 0 (or 0.0, 0.00, etc.).

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `GZIPOutInterceptor()`
    `GZIPOutInterceptor(int threshold)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `int` | `getThreshold()`
    `static GZIPOutInterceptor.UseGzip` | `gzipPermitted(Message message, boolean force)` Checks whether we can, cannot or must use gzip compression on this output message.
    `void` | `handleMessage(Message message)` Intercepts a message.
    `void` | `setForce(boolean force)`
    `void` | `setThreshold(int threshold)`

    - ### Methods inherited from class org.apache.cxf.phase.AbstractPhaseInterceptor

      `addAfter, addAfter, addBefore, addBefore, getAdditionalInterceptors, getAfter, getBefore, getId, getPhase, handleFault, isGET, isRequestor, setAfter, setBefore`

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

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

- - ### Field Detail

    - #### ZERO_Q

          public static final Pattern ZERO_Q

      regular expression that matches any encoding with a q-value of 0 (or 0.0, 0.00, etc.).

    - #### ENCODINGS

          public static final Pattern ENCODINGS

      regular expression which can split encodings

    - #### ORIGINAL_OUTPUT_STREAM_KEY

          public static final String ORIGINAL_OUTPUT_STREAM_KEY

      Key under which we store the original output stream on the message, for use by the ending interceptor.

    - #### USE_GZIP_KEY

          public static final String USE_GZIP_KEY

      Key under which we store an indication of whether compression is permitted or required, for use by the ending interceptor.

    - #### GZIP_ENCODING_KEY

          public static final String GZIP_ENCODING_KEY

      Key under which we store the name which should be used for the content-encoding of the outgoing message. Typically "gzip" but may be "x-gzip" if we are processing a response message and this is the name given by the client in Accept-Encoding.

    - #### SOAP_JMS_CONTENTENCODING

          public static final String SOAP_JMS_CONTENTENCODING

      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### GZIPOutInterceptor

          public GZIPOutInterceptor()

    - #### GZIPOutInterceptor

          public GZIPOutInterceptor(int threshold)

  - ### Method Detail

    - #### setThreshold

          public void setThreshold(int threshold)

    - #### getThreshold

          public int getThreshold()

    - #### handleMessage

          public void handleMessage(Message message)
                             throws Fault

      Description copied from interface: `Interceptor`
      Intercepts a message. Interceptors should NOT invoke handleMessage or handleFault on the next interceptor - the interceptor chain will take care of this.
      Throws:
        `Fault`

    - #### gzipPermitted

          public static GZIPOutInterceptor.UseGzip gzipPermitted(Message message,
                                                 boolean force)
                                                          throws Fault

      Checks whether we can, cannot or must use gzip compression on this output message. Gzip is always permitted if the message is a client request. If the message is a server response we check the Accept-Encoding header of the corresponding request message - with no Accept-Encoding we assume that gzip is not permitted. For the full gory details, see section 14.3 of RFC 2616 (HTTP 1.1).
      Parameters:
        `message` - the outgoing message.
      Returns:
        whether to attempt gzip compression for this message.
      Throws:
        `Fault` - if the Accept-Encoding header does not allow any encoding that we can support (identity, gzip or x-gzip).

    - #### setForce

          public void setForce(boolean force)

Apache CXF