Package org.zkoss.util.media

Class AMedia

java.lang.Object

org.zkoss.util.media.AMedia

All Implemented Interfaces:

Serializable, Media

public class AMedia
extends Object
implements Media, Serializable

A media object holding content such PDF, HTML, DOC or XLS content.

AMedia is serializable, but, if you are using InputStream or Reader, you have to extend this class, and provide the implementation to serialize and deserialize _isdata or _rddata (they are both transient).

Author:

tomyeh

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected InputStream	_isdata	The input stream, getStreamData()
protected Reader	_rddata	The input stream, getReaderData()
protected static final Reader	DYNAMIC_READER	Used if you want to implement a media whose reader is created dynamically each time getReaderData() is called.
protected static final InputStream	DYNAMIC_STREAM	Used if you want to implement a media whose input stream is created dynamically each time getStreamData() is called.

Constructor Summary

Constructors

Constructor	Description
AMedia(File file, String ctype, String charset)	Construct with a file.
AMedia(String name, String format, String ctype, byte[] data)	Construct with name, format, content type and binary data.
AMedia(String name, String format, String ctype, File file, boolean binary)	Construct with name, format, content type and a file.
AMedia(String name, String format, String ctype, File file, String charset)	Construct with name, format, content type and a file.
AMedia(String name, String format, String ctype, InputStream data)	Construct with name, format, content type and stream data (binary).
AMedia(String name, String format, String ctype, Reader data)	Construct with name, format, content type and reader data (textual).
AMedia(String name, String format, String ctype, String data)	Construct with name, format, content type and text data.
AMedia(String name, String format, String ctype, URL url, String charset)	Construct with name, format, content type and URL.
AMedia(URL url, String ctype, String charset)	Construct with a file.

Method Summary

Modifier and Type	Method	Description
byte[]	getByteData()	Returns the raw data in byte array.
String	getContentType()	Returns the content type, e.g., "image/jpeg", or null if not available.
String	getFormat()	Returns the format name, e.g., "jpeg", or null if not available.
String	getName()	Returns the name (usually filename) of this media, or null if not available.
Reader	getReaderData()	Returns the reader of this media to retrieve the data.
InputStream	getStreamData()	Returns the input stream of this media.
String	getStringData()	Returns the raw data in string.
boolean	inMemory()	Returns whether the data is cached in memory (in form of byte[] or String).
boolean	isBinary()	Returns whether the format of this content is binary or text-based.
boolean	isContentDisposition()	Whether to allow Content-Disposition or not when writing the media to response header.
void	setContentDisposition(boolean cntDisposition)	Set whether to allow Content-Disposition or not when writing the media to response header.
String	toString()

Methods inherited from class java.lang.Object

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

Field Details

DYNAMIC_STREAM

protected static final InputStream DYNAMIC_STREAM

Used if you want to implement a media whose input stream is created dynamically each time getStreamData() is called.

See Also:

• AMedia(String,String,String,InputStream)

DYNAMIC_READER

protected static final Reader DYNAMIC_READER

Used if you want to implement a media whose reader is created dynamically each time getReaderData() is called.

See Also:

• AMedia(String,String,String,Reader)

_isdata

protected transient InputStream _isdata

The input stream, getStreamData()

_rddata

protected transient Reader _rddata

The input stream, getReaderData()

Constructor Details

AMedia

public AMedia(String name,
 String format,
 String ctype,
 byte[] data)

Construct with name, format, content type and binary data.

It tries to construct format and ctype from each other or name.

Parameters:

name - the name (usually filename); might be null.

format - the format; might be null. Example: "html" and "xml"

ctype - the content type; might be null. Example: "text/html" and "text/xml;charset=UTF-8".

data - the binary data; never null

AMedia

public AMedia(String name,
 String format,
 String ctype,
 String data)

Construct with name, format, content type and text data.

It tries to construct format and ctype from each other or name.

Parameters:

name - the name (usually filename); might be null.

format - the format; might be null.

ctype - the content type; might be null.

data - the text data; never null

AMedia

public AMedia(String name,
 String format,
 String ctype,
 InputStream data)

Construct with name, format, content type and stream data (binary).

It tries to construct format and ctype from each other or name.

Parameters:

name - the name (usually filename); might be null.

format - the format; might be null.

ctype - the content type; might be null.

data - the binary data; never null. If the input stream is created dynamically each time getStreamData() is called, you shall pass DYNAMIC_STREAM as the data argument. Then, override getStreamData() to return the correct stream. Note: the caller of getStreamData() has to close the returned input stream.

AMedia

public AMedia(String name,
 String format,
 String ctype,
 Reader data)

Construct with name, format, content type and reader data (textual).

It tries to construct format and ctype from each other or name.

Parameters:

name - the name (usually filename); might be null.

format - the format; might be null.

ctype - the content type; might be null.

data - the string data; never null If the reader is created dynamically each time getReaderData() is called, you shall pass DYNAMIC_READER as the data argument. Then, override getReaderData() to return the correct reader.

AMedia

public AMedia(String name,
 String format,
 String ctype,
 File file,
 boolean binary)
       throws FileNotFoundException

Construct with name, format, content type and a file.

Unlike others, it uses the so-called repeatable input stream or reader (depending on binary or not) to represent the file, so the input stream (getStreamData()) or the reader (getReaderData()) will be re-opened in the next invocation of InputStream.read() after InputStream.close() is called. See also RepeatableInputStream and RepeatableReader.

Parameters:

name - the name (usually filename); might be null. If null, the file name is used.

format - the format; might be null.

ctype - the content type; might be null.

file - the file; never null.

binary - whether it is binary. If not binary, "UTF-8" is assumed.

Throws:

FileNotFoundException

AMedia

public AMedia(String name,
 String format,
 String ctype,
 File file,
 String charset)
       throws FileNotFoundException

Construct with name, format, content type and a file.

Unlike others, it uses the so-called repeatable input stream or reader (depending on charset is null or not) to represent the file, so the input stream (getStreamData()) or the reader (getReaderData()) will be re-opened in the next invocation of InputStream.read() after InputStream.close() is called. See also RepeatableInputStream and RepeatableReader.

Parameters:

name - the name (usually filename); might be null. If null, the file name is used.

format - the format; might be null.

ctype - the content type; might be null.

file - the file; never null.

charset - the charset. If null, it is assumed to be binary.

Throws:

FileNotFoundException

AMedia

public AMedia(File file,
 String ctype,
 String charset)
       throws FileNotFoundException

Construct with a file. It is the same as AMedia(null, null, ctype, file, charset).

Parameters:

ctype - the content type; might be null. If null, it is retrieved from the file name's extension.

Throws:

FileNotFoundException

Since:

3.0.8

AMedia

public AMedia(String name,
 String format,
 String ctype,
 URL url,
 String charset)
       throws FileNotFoundException

Construct with name, format, content type and URL.

Unlike others, it uses the so-called repeatable input stream or reader (depending on charset is null or not) to represent the resource, so the input stream (getStreamData()) or the reader (getReaderData()) will be re-opened in the next invocation of InputStream.read() after InputStream.close() is called. See also RepeatableInputStream and RepeatableReader.

Parameters:

name - the name; might be null. If null, URL's name is used.

format - the format; might be null.

ctype - the content type; might be null.

url - the resource URL; never null.

Throws:

FileNotFoundException

Since:

3.0.8

AMedia

public AMedia(URL url,
 String ctype,
 String charset)
       throws FileNotFoundException

Construct with a file. It is the same as AMedia(null, null, ctype, url, charset).

Parameters:

ctype - the content type; might be null. If null, it is retrieved from the file name's extension.

Throws:

FileNotFoundException

Since:

3.0.8

Method Details

setContentDisposition

public void setContentDisposition(boolean cntDisposition)

Set whether to allow Content-Disposition or not when writing the media to response header.

Since:

7.0.0

isBinary

public boolean isBinary()

Description copied from interface: Media

Returns whether the format of this content is binary or text-based. If true, use Media.getByteData() or Media.getStreamData() to retrieve its content. If false, use Media.getStringData() or Media.getReaderData() to retrieve its content.

Specified by:

isBinary in interface Media

See Also:

• Media.getStringData()
• Media.getByteData()
• Media.getReaderData()
• Media.getStreamData()

inMemory

public boolean inMemory()

Description copied from interface: Media

Returns whether the data is cached in memory (in form of byte[] or String).

Specified by:

inMemory in interface Media

See Also:

• Media.getStringData()
• Media.getByteData()
• Media.getReaderData()
• Media.getStreamData()

getByteData

public byte[] getByteData()

Description copied from interface: Media

Returns the raw data in byte array.

It might not be a copy, so don't modify it directly unless you know what you are doing.

If the data is not cached in memory (Media.inMemory() return false), the data will be read from Media.getStreamData(). Furthermore, it also implies you can not invoke this method again.

Specified by:

getByteData in interface Media

See Also:

• Media.getStringData()

getStringData

public String getStringData()

Description copied from interface: Media

Returns the raw data in string.

If the data is not cached in memory (Media.inMemory() return false), the data will be read from Media.getReaderData(). Furthermore, it also implies you can not invoke this method again.

Specified by:

getStringData in interface Media

See Also:

• Media.getByteData()

getStreamData

public InputStream getStreamData()

Returns the input stream of this media.

Note: the caller has to invoke InputStream.close() after using the input stream returned by this method.

It wraps getByteData() with ByteArrayInputStream if inMemory() returns true.

Specified by:

getStreamData in interface Media

Throws:

IllegalStateException - if the media isBinary() returns false

See Also:

• Media.getReaderData()

getReaderData

public Reader getReaderData()

Returns the reader of this media to retrieve the data.

Note: the caller has to invoke Reader.close() after using the input stream returned by this method.

It wraps getStringData() with StringReader, if inMemory() returns true.

Specified by:

getReaderData in interface Media

Throws:

IllegalStateException - if isBinary() returns true

See Also:

• Media.getStreamData()

getName

public String getName()

Description copied from interface: Media

Returns the name (usually filename) of this media, or null if not available.

Specified by:

getName in interface Media

getFormat

public String getFormat()

Description copied from interface: Media

Returns the format name, e.g., "jpeg", or null if not available.

Specified by:

getFormat in interface Media

See Also:

• Media.getContentType()

getContentType

public String getContentType()

Description copied from interface: Media

Returns the content type, e.g., "image/jpeg", or null if not available.

Specified by:

getContentType in interface Media

See Also:

• Media.getFormat()

isContentDisposition

public boolean isContentDisposition()

Description copied from interface: Media

Whether to allow Content-Disposition or not when writing the media to response header.

Default: true

Specified by:

isContentDisposition in interface Media

toString

public String toString()

Overrides:

toString in class Object