org.apache.wicket.util.upload
Class FileUploadBase

java.lang.Object
  org.apache.wicket.util.upload.FileUploadBase

Direct Known Subclasses:

FileUpload

public abstract class FileUploadBase
extends java.lang.Object

High level API for processing file uploads.

This class handles multiple files per single HTML widget, sent using multipart/mixed encoding type, as specified by RFC 1867. Use #parseRequest(HttpServletRequest) to acquire a list of FileItems associated with a given HTML widget.

How the data for individual parts is stored is determined by the factory used to create them; a given part may be in memory, on disk, or somewhere else.

Author:

Rafal Krzewski, Daniel Rall, Jason van Zyl, John McNally, Martin Cooper, Sean C. Sullivan

Nested Class Summary

static class	FileUploadBase.FileSizeLimitExceededException Thrown to indicate that A files size exceeds the configured maximum.
static class	FileUploadBase.FileUploadIOException This exception is thrown for hiding an inner FileUploadException in an IOException.
static class	FileUploadBase.InvalidContentTypeException Thrown to indicate that the request is not a multipart request.
static class	FileUploadBase.IOFileUploadException Thrown to indicate an IOException.
protected static class	FileUploadBase.SizeException This exception is thrown, if a requests permitted size is exceeded.
static class	FileUploadBase.SizeLimitExceededException Thrown to indicate that the request size exceeds the configured maximum.

Field Summary

static java.lang.String	ATTACHMENT Content-disposition value for file attachment.
static java.lang.String	CONTENT_DISPOSITION HTTP content disposition header name.
static java.lang.String	CONTENT_LENGTH HTTP content length header name.
static java.lang.String	CONTENT_TYPE HTTP content type header name.
static java.lang.String	FORM_DATA Content-disposition value for form data.
static java.lang.String	MULTIPART Part of HTTP content type header.
static java.lang.String	MULTIPART_FORM_DATA HTTP content type header for multipart forms.
static java.lang.String	MULTIPART_MIXED HTTP content type header for multiple uploads.

Constructor Summary

FileUploadBase()

Method Summary

protected byte[]	getBoundary(java.lang.String contentType) Retrieves the boundary from the Content-type header.
protected java.lang.String	getFieldName(FileItemHeaders headers) Retrieves the field name from the Content-disposition header.
abstract FileItemFactory	getFileItemFactory() Returns the factory class used when creating file items.
protected java.lang.String	getFileName(FileItemHeaders headers) Retrieves the file name from the Content-disposition header.
long	getFileSizeMax() Returns the maximum allowed size of a single uploaded file, as opposed to getSizeMax().
java.lang.String	getHeaderEncoding() Retrieves the character encoding used when reading the headers of an individual part.
FileItemIterator	getItemIterator(RequestContext ctx) Processes an RFC 1867 compliant multipart/form-data stream.
protected FileItemHeaders	getParsedHeaders(java.lang.String headerPart) Parses the header-part and returns as key/value pairs.
ProgressListener	getProgressListener() Returns the progress listener.
long	getSizeMax() Returns the maximum allowed size of a complete request, as opposed to getFileSizeMax().
static boolean	isMultipartContent(RequestContext ctx) Utility method that determines whether the request contains multipart content.
protected FileItemHeadersImpl	newFileItemHeaders() Creates a new instance of FileItemHeaders.
java.util.List<FileItem>	parseRequest(RequestContext ctx) Processes an RFC 1867 compliant multipart/form-data stream.
abstract void	setFileItemFactory(FileItemFactory factory) Sets the factory class to use when creating file items.
void	setFileSizeMax(long fileSizeMax) Sets the maximum allowed size of a single uploaded file, as opposed to getSizeMax().
void	setHeaderEncoding(java.lang.String encoding) Specifies the character encoding to be used when reading the headers of individual part.
void	setProgressListener(ProgressListener pListener) Sets the progress listener.
void	setSizeMax(long sizeMax) Sets the maximum allowed size of a complete request, as opposed to setFileSizeMax(long).

Methods inherited from class java.lang.Object

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

Field Detail

CONTENT_TYPE

public static final java.lang.String CONTENT_TYPE

HTTP content type header name.

See Also:

Constant Field Values

CONTENT_DISPOSITION

public static final java.lang.String CONTENT_DISPOSITION

HTTP content disposition header name.

See Also:

Constant Field Values

CONTENT_LENGTH

public static final java.lang.String CONTENT_LENGTH

HTTP content length header name.

See Also:

Constant Field Values

FORM_DATA

public static final java.lang.String FORM_DATA

Content-disposition value for form data.

See Also:

Constant Field Values

ATTACHMENT

public static final java.lang.String ATTACHMENT

Content-disposition value for file attachment.

See Also:

Constant Field Values

MULTIPART

public static final java.lang.String MULTIPART

Part of HTTP content type header.

See Also:

Constant Field Values

MULTIPART_FORM_DATA

public static final java.lang.String MULTIPART_FORM_DATA

HTTP content type header for multipart forms.

See Also:

Constant Field Values

MULTIPART_MIXED

public static final java.lang.String MULTIPART_MIXED

HTTP content type header for multiple uploads.

See Also:

Constant Field Values

Constructor Detail

FileUploadBase

public FileUploadBase()

Method Detail

isMultipartContent

public static final boolean isMultipartContent(RequestContext ctx)

Utility method that determines whether the request contains multipart content.

NOTE:This method will be moved to the ServletFileUpload class after the FileUpload 1.1 release. Unfortunately, since this method is static, it is not possible to provide its replacement until this method is removed.

Parameters:

ctx - The request context to be evaluated. Must be non-null.

Returns:

true if the request is multipart; false otherwise.

getFileItemFactory

public abstract FileItemFactory getFileItemFactory()

Returns the factory class used when creating file items.

Returns:

The factory class for new file items.

setFileItemFactory

public abstract void setFileItemFactory(FileItemFactory factory)

Sets the factory class to use when creating file items.

Parameters:

factory - The factory class for new file items.

getSizeMax

public long getSizeMax()

Returns the maximum allowed size of a complete request, as opposed to getFileSizeMax().

Returns:

The maximum allowed size, in bytes. The default value of -1 indicates, that there is no limit.

See Also:

setSizeMax(long)

setSizeMax

public void setSizeMax(long sizeMax)

Sets the maximum allowed size of a complete request, as opposed to setFileSizeMax(long).

Parameters:

sizeMax - The maximum allowed size, in bytes. The default value of -1 indicates, that there is no limit.

See Also:

getSizeMax()

getFileSizeMax

public long getFileSizeMax()

Returns the maximum allowed size of a single uploaded file, as opposed to getSizeMax().

Returns:

Maximum size of a single uploaded file.

See Also:

setFileSizeMax(long)

setFileSizeMax

public void setFileSizeMax(long fileSizeMax)

Sets the maximum allowed size of a single uploaded file, as opposed to getSizeMax().

Parameters:

fileSizeMax - Maximum size of a single uploaded file.

See Also:

getFileSizeMax()

getHeaderEncoding

public java.lang.String getHeaderEncoding()

Retrieves the character encoding used when reading the headers of an individual part. When not specified, or null, the request encoding is used. If that is also not specified, or null, the platform default encoding is used.

Returns:

The encoding used to read part headers.

setHeaderEncoding

public void setHeaderEncoding(java.lang.String encoding)

Specifies the character encoding to be used when reading the headers of individual part. When not specified, or null, the request encoding is used. If that is also not specified, or null, the platform default encoding is used.

Parameters:

encoding - The encoding used to read part headers.

getItemIterator

public FileItemIterator getItemIterator(RequestContext ctx)
                                 throws FileUploadException,
                                        java.io.IOException

Processes an RFC 1867 compliant multipart/form-data stream.

Parameters:

ctx - The context for the request to be parsed.

Returns:

An iterator to instances of FileItemStream parsed from the request, in the order that they were transmitted.

Throws:

FileUploadException - if there are problems reading/parsing the request or storing files.

FileUploadBase.FileUploadIOException - An I/O error occurred. This may be a network error while communicating with the client or a problem while storing the uploaded content.

java.io.IOException

parseRequest

public java.util.List<FileItem> parseRequest(RequestContext ctx)
                                      throws FileUploadException

Processes an RFC 1867 compliant multipart/form-data stream.

Parameters:

ctx - The context for the request to be parsed.

Returns:

A list of FileItem instances parsed from the request, in the order that they were transmitted.

Throws:

FileUploadException - if there are problems reading/parsing the request or storing files.

getBoundary

protected byte[] getBoundary(java.lang.String contentType)

Retrieves the boundary from the Content-type header.

Parameters:

contentType - The value of the content type header from which to extract the boundary value.

Returns:

The boundary, as a byte array.

getFileName

protected java.lang.String getFileName(FileItemHeaders headers)

Retrieves the file name from the Content-disposition header.

Parameters:

headers - The HTTP headers object.

Returns:

The file name for the current encapsulation.

getFieldName

protected java.lang.String getFieldName(FileItemHeaders headers)

Retrieves the field name from the Content-disposition header.

Parameters:

headers - A Map containing the HTTP request headers.

Returns:

The field name for the current encapsulation.

getParsedHeaders

protected FileItemHeaders getParsedHeaders(java.lang.String headerPart)

Parses the header-part and returns as key/value pairs.

If there are multiple headers of the same names, the name will map to a comma-separated list containing the values.

Parameters:

headerPart - The header-part of the current encapsulation.

Returns:

A Map containing the parsed HTTP request headers.

newFileItemHeaders

protected FileItemHeadersImpl newFileItemHeaders()

Creates a new instance of FileItemHeaders.

Returns:

The new instance.

getProgressListener

public ProgressListener getProgressListener()

Returns the progress listener.

Returns:

The progress listener, if any, or null.

setProgressListener

public void setProgressListener(ProgressListener pListener)

Sets the progress listener.

Parameters:

pListener - The progress listener, if any. Defaults to null.