org.mentawai.core
Class StreamConsequence

java.lang.Object
  org.mentawai.core.StreamConsequence

All Implemented Interfaces:

Consequence

public class StreamConsequence
extends Object
implements Consequence

A web-based consequence that gets a ready-to-use input stream from the output of the action, get the contents from that input stream and flush them to the servlet output stream. Very useful for loading images from a database, downloads and other resources that the programmer may want to protect from direct access from the client. This class is thread-safe.

Author:

Rubem Azenha, Sergio Oliveira Jr.

Field Summary

static String	APPLICATION_OGG Ogg, a multimedia bitstream container format.
static String	APPLICATION_PDF Portable Document Format.
static String	APPLICATION_SOAP SOAP.
static String	AUDIO_MPEG MP3 or other MPEG audio.
static String	AUDIO_OGG Ogg Vorbis, Speex, Flac and other audio.
static String	CONTENT_DISPOSITION The default key ("contentDisposition") to look for in the action output.
static String	CONTENT_LENGTH The default key ("contentLength") to look for in the action output.
static String	CONTENT_TYPE The default key ("contentType") to look for in the action output.
static String	EXCEL
static String	FILENAME
static String	IMAGE_GIF GIF image.
static String	IMAGE_JPEG JPEG JFIF image.
static String	IMAGE_PNG Portable Network Graphics.
static String	STREAM The default key ("stream") to look for in the action output.

Constructor Summary

StreamConsequence()
Creates a new instance of the StreamConsequence class.

StreamConsequence(String contentType)
Creates a new instance of the StreamConsequence class, with the given content-type

Method Summary

protected void	defineHeader(javax.servlet.http.HttpServletResponse res, Output output)
void	execute(Action a, String result, javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res) Executes the action, reading from the input stream the data that has to be flushed into the servlet output stream.
StreamConsequence	keyForContentDisposition(String key)
StreamConsequence	keyForContentLength(String key)
StreamConsequence	keyForContentType(String key)
StreamConsequence	keyForFilename(String key)
StreamConsequence	keyForStream(String key)

Methods inherited from class java.lang.Object

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

Field Detail

STREAM

public static final String STREAM

The default key ("stream") to look for in the action output.

See Also:

Constant Field Values

CONTENT_DISPOSITION

public static final String CONTENT_DISPOSITION

The default key ("contentDisposition") to look for in the action output.

See Also:

Constant Field Values

CONTENT_LENGTH

public static final String CONTENT_LENGTH

The default key ("contentLength") to look for in the action output.

See Also:

Constant Field Values

CONTENT_TYPE

public static final String CONTENT_TYPE

The default key ("contentType") to look for in the action output.

See Also:

Constant Field Values

APPLICATION_OGG

public static final String APPLICATION_OGG

Ogg, a multimedia bitstream container format. Defined in RFC 5334.

See Also:

Constant Field Values

APPLICATION_PDF

public static final String APPLICATION_PDF

Portable Document Format. Defined in RFC 3778 5334.

See Also:

Constant Field Values

APPLICATION_SOAP

public static final String APPLICATION_SOAP

SOAP. Defined by RFC 3902.

See Also:

Constant Field Values

AUDIO_MPEG

public static final String AUDIO_MPEG

MP3 or other MPEG audio. Defined in RFC 3003.

See Also:

Constant Field Values

AUDIO_OGG

public static final String AUDIO_OGG

Ogg Vorbis, Speex, Flac and other audio. Defined in RFC 5334.

See Also:

Constant Field Values

IMAGE_GIF

public static final String IMAGE_GIF

GIF image. Defined in RFC 2045 and RFC 2046.

See Also:

Constant Field Values

IMAGE_JPEG

public static final String IMAGE_JPEG

JPEG JFIF image. Defined in RFC 2045 and RFC 2046.

See Also:

Constant Field Values

IMAGE_PNG

public static final String IMAGE_PNG

Portable Network Graphics. Defined in RFC 2083.

See Also:

Constant Field Values

EXCEL

public static final String EXCEL

See Also:

Constant Field Values

FILENAME

public static final String FILENAME

See Also:

Constant Field Values

Constructor Detail

StreamConsequence

public StreamConsequence()

Creates a new instance of the StreamConsequence class. The content type and everything else will be dynamic, in other words, defined by the action at runtime.

StreamConsequence

public StreamConsequence(String contentType)

Creates a new instance of the StreamConsequence class, with the given content-type

Parameters:

contentType - The content type to set in the servlet response.

Method Detail

keyForFilename

public StreamConsequence keyForFilename(String key)

keyForContentType

public StreamConsequence keyForContentType(String key)

keyForContentDisposition

public StreamConsequence keyForContentDisposition(String key)

keyForContentLength

public StreamConsequence keyForContentLength(String key)

keyForStream

public StreamConsequence keyForStream(String key)

execute

public void execute(Action a,
                    String result,
                    javax.servlet.http.HttpServletRequest req,
                    javax.servlet.http.HttpServletResponse res)
             throws ConsequenceException

Executes the action, reading from the input stream the data that has to be flushed into the servlet output stream.

Specified by:

execute in interface Consequence

Parameters:

a - The action that generated this consequence.

result - The result generated by the action.

req - The servlet request of the action.

res - The servlet response of the action.

Throws:

ConsequenceException

defineHeader

protected void defineHeader(javax.servlet.http.HttpServletResponse res,
                            Output output)
                     throws ConsequenceException

Throws:

ConsequenceException