Package digilib.servlet

Class ServletOps

java.lang.Object

digilib.servlet.ServletOps

public class ServletOps
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
protected static boolean	corsForImageRequests	set CORS header ACAO* for image requests
protected static boolean	corsForInfoRequests	set CORS header ACAO* for info requests
protected static DigilibServletConfiguration	dlConfig
protected static org.slf4j.Logger	logger

Constructor Summary

Constructors

Constructor	Description
ServletOps()

Method Summary

Modifier and Type	Method	Description
static File	getConfigFile(File f, javax.servlet.ServletContext sc)	Get a real File for a config File.
static DigilibServletConfiguration	getDlConfig()
static File	getFile(File f, javax.servlet.ServletContext sc)	Get a real File for a web app File.
static String	getIiifImageUrl(DigilibServletRequest dlReq)	Returns the IIIF URL for the requested image.
static String	headersToString(javax.servlet.http.HttpServletRequest req)	Returns text representation of headers for debuggging purposes.
static void	htmlMessage(String title, String msg, javax.servlet.http.HttpServletResponse response)	print a servlet response
static void	htmlMessage(String msg, javax.servlet.http.HttpServletResponse response)	print a servlet response
static void	sendFile(File f, String mt, String name, javax.servlet.http.HttpServletResponse response)	Transfers an image file as-is with the mime type mt.
static void	sendFile(File f, String mt, String name, javax.servlet.http.HttpServletResponse response, org.slf4j.Logger logger)	Transfers an image file as-is with the mime type mt.
static void	sendIiifInfo(DigilibServletRequest dlReq, javax.servlet.http.HttpServletResponse response, org.slf4j.Logger logger)	Sends IIIF compatible image information as application/json response.
static void	sendImage(DocuImage img, String mimeType, javax.servlet.http.HttpServletResponse response)	Write image img to ServletResponse response.
static void	sendImage(DocuImage img, String mimeType, javax.servlet.http.HttpServletResponse response, org.slf4j.Logger logger)	Write image img to ServletResponse response as data of mimeType.
static void	setDlConfig(DigilibServletConfiguration dlConfig)
protected static void	writeIiifV1Info(jakarta.json.stream.JsonGenerator info, ImageSize size, String url)	Write IIIF Image API version 1 image information to info.
protected static void	writeIiifV2Info(jakarta.json.stream.JsonGenerator info, org.slf4j.Logger logger, ImageSize size, ImageSet imageSet, String url)	Write IIIF Image API version 2 image information to info.
protected static void	writeIiifV3Info(jakarta.json.stream.JsonGenerator info, org.slf4j.Logger logger, ImageSize size, ImageSet imageSet, String url)	Write IIIF Image API version 3 image information to info.

Methods inherited from class java.lang.Object

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

Field Details

logger

protected static org.slf4j.Logger logger

dlConfig

protected static DigilibServletConfiguration dlConfig

corsForInfoRequests

protected static boolean corsForInfoRequests

set CORS header ACAO* for info requests

corsForImageRequests

protected static boolean corsForImageRequests

set CORS header ACAO* for image requests

Constructor Details

ServletOps

public ServletOps()

Method Details

getDlConfig

public static DigilibServletConfiguration getDlConfig()

Returns:

the dlConfig

setDlConfig

public static void setDlConfig(DigilibServletConfiguration dlConfig)

Parameters:

dlConfig - the dlConfig to set

getFile

public static File getFile(File f,
 javax.servlet.ServletContext sc)

Get a real File for a web app File. If the File is not absolute the path is appended to the base directory of the web-app. If the file does not exist in the web-app directory it is considered relative to the Java working directory.

Parameters:

f - the File

sc - the ServletContext

Returns:

the File

getConfigFile

public static File getConfigFile(File f,
 javax.servlet.ServletContext sc)

Get a real File for a config File. If the File is not absolute the path is appended to the WEB-INF directory of the web-app. If the file does not exist in the WEB-INF directory it is considered relative to the Java working directory.

Parameters:

f - the File

sc - the ServletContext

Returns:

the File

htmlMessage

public static void htmlMessage(String msg,
 javax.servlet.http.HttpServletResponse response)
                        throws IOException

print a servlet response

Parameters:

msg - the msg

response - the HttpServletResponse

Throws:

IOException - on error

htmlMessage

public static void htmlMessage(String title,
 String msg,
 javax.servlet.http.HttpServletResponse response)
                        throws IOException

print a servlet response

Parameters:

title - the title

msg - the msg

response - the HttpServletResponse

Throws:

IOException - on error

sendFile

public static void sendFile(File f,
 String mt,
 String name,
 javax.servlet.http.HttpServletResponse response)
                     throws ImageOpException,
IOException

Transfers an image file as-is with the mime type mt. The local file is copied to the OutputStream of the ServletResponse. If mt is null then the mime-type is auto-detected with mimeForFile.

Parameters:

f - Image file to be sent.

mt - mime-type of the file.

name - name of the download file (for application/x)

response - ServletResponse where the image file will be sent.

Throws:

ImageOpException - on error

IOException - on error

sendFile

public static void sendFile(File f,
 String mt,
 String name,
 javax.servlet.http.HttpServletResponse response,
 org.slf4j.Logger logger)
                     throws ImageOpException,
IOException

Transfers an image file as-is with the mime type mt. The local file is copied to the OutputStream of the ServletResponse. If mt is null then the mime-type is auto-detected with mimeForFile.

Parameters:

f - Image file to be sent.

mt - mime-type of the file.

name - name of the download file (for application/x)

response - ServletResponse where the image file will be sent.

logger - Logger to use

Throws:

ImageOpException - on error

IOException - on error

sendImage

public static void sendImage(DocuImage img,
 String mimeType,
 javax.servlet.http.HttpServletResponse response)
                      throws ImageOpException,
IOException

Write image img to ServletResponse response.

Parameters:

img - the DocuImage

mimeType - the mime-type

response - the HttpServletResponse

Throws:

ImageOpException - on error

javax.servlet.ServletException - Exception on sending data.

IOException

sendImage

public static void sendImage(DocuImage img,
 String mimeType,
 javax.servlet.http.HttpServletResponse response,
 org.slf4j.Logger logger)
                      throws ImageOpException,
IOException

Write image img to ServletResponse response as data of mimeType. If mimeType is null, use heuristics for type.

Parameters:

img - the DocuImage

mimeType - the mime-type

response - the HttpServletResponse

logger - the Logger

Throws:

ImageOpException - on error

javax.servlet.ServletException - Exception on sending data.

IOException

sendIiifInfo

public static void sendIiifInfo(DigilibServletRequest dlReq,
 javax.servlet.http.HttpServletResponse response,
 org.slf4j.Logger logger)
                         throws javax.servlet.ServletException

Sends IIIF compatible image information as application/json response.

Parameters:

dlReq - the DigilibServletRequest

response - the HttpServletResponse

logger - the Logger

Throws:

javax.servlet.ServletException - on error

See Also:

• IIIF Image Information Request

writeIiifV1Info

protected static void writeIiifV1Info(jakarta.json.stream.JsonGenerator info,
 ImageSize size,
 String url)
                               throws IOException

Write IIIF Image API version 1 image information to info.

Parameters:

info -

size -

url -

Throws:

IOException

writeIiifV2Info

protected static void writeIiifV2Info(jakarta.json.stream.JsonGenerator info,
 org.slf4j.Logger logger,
 ImageSize size,
 ImageSet imageSet,
 String url)
                               throws IOException

Write IIIF Image API version 2 image information to info.

Parameters:

info -

logger -

size -

imageSet -

url -

Throws:

IOException

writeIiifV3Info

protected static void writeIiifV3Info(jakarta.json.stream.JsonGenerator info,
 org.slf4j.Logger logger,
 ImageSize size,
 ImageSet imageSet,
 String url)
                               throws IOException

Write IIIF Image API version 3 image information to info.

Parameters:

info -

logger -

size -

imageSet -

url -

Throws:

IOException

getIiifImageUrl

public static String getIiifImageUrl(DigilibServletRequest dlReq)

Returns the IIIF URL for the requested image.

Parameters:

dlReq -

Returns:

headersToString

public static String headersToString(javax.servlet.http.HttpServletRequest req)

Returns text representation of headers for debuggging purposes.

Parameters:

req - the HttpServletRequest

Returns:

the headers string