org.zkoss.util.media
Class AMedia

java.lang.Object
  extended by org.zkoss.util.media.AMedia
All Implemented Interfaces:
java.io.Serializable, Media

public class AMedia
extends java.lang.Object
implements Media, java.io.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 serlialize and deserialize _isdata or _rddata (they are both transient).

Author:
tomyeh
See Also:
Serialized Form

Field Summary
protected  java.io.InputStream _isdata
          The input stream, getStreamData()
protected  java.io.Reader _rddata
          The input stream, getReaderData()
protected static java.io.Reader DYNAMIC_READER
          Used if you want to implement a meida whose reader is created dynamically each time getReaderData() is called.
protected static java.io.InputStream DYNAMIC_STREAM
          Used if you want to implement a meida whose input stream is created dynamically each time getStreamData() is called.
 
Constructor Summary
AMedia(java.io.File file, java.lang.String ctype, java.lang.String charset)
          Construct with a file.
AMedia(java.lang.String name, java.lang.String format, java.lang.String ctype, byte[] data)
          Construct with name, format, content type and binary data.
AMedia(java.lang.String name, java.lang.String format, java.lang.String ctype, java.io.File file, boolean binary)
          Construct with name, format, content type and a file.
AMedia(java.lang.String name, java.lang.String format, java.lang.String ctype, java.io.File file, java.lang.String charset)
          Construct with name, format, content type and a file.
AMedia(java.lang.String name, java.lang.String format, java.lang.String ctype, java.io.InputStream data)
          Construct with name, format, content type and stream data (binary).
AMedia(java.lang.String name, java.lang.String format, java.lang.String ctype, java.io.Reader data)
          Construct with name, format, content type and reader data (textual).
AMedia(java.lang.String name, java.lang.String format, java.lang.String ctype, java.lang.String data)
          Construct with name, format, content type and text data.
AMedia(java.lang.String name, java.lang.String format, java.lang.String ctype, java.net.URL url, java.lang.String charset)
          Construct with name, format, content type and URL.
AMedia(java.net.URL url, java.lang.String ctype, java.lang.String charset)
          Construct with a file.
 
Method Summary
 byte[] getByteData()
          Returns the raw data in byte array.
 java.lang.String getContentType()
          Returns the content type, e.g., "image/jpeg", or null if not available.
 java.lang.String getFormat()
          Returns the format name, e.g., "jpeg", or null if not available.
 java.lang.String getName()
          Returns the name (usually filename) of this media, or null if not available.
 java.io.Reader getReaderData()
          Returns the reader of this media to retrieve the data.
 java.io.InputStream getStreamData()
          Returns the input stream of this media.
 java.lang.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 tis content is binary or text-based.
 java.lang.String toString()
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

DYNAMIC_STREAM

protected static final java.io.InputStream DYNAMIC_STREAM
Used if you want to implement a meida whose input stream is created dynamically each time getStreamData() is called.

See Also:
AMedia(String,String,String,InputStream)

DYNAMIC_READER

protected static final java.io.Reader DYNAMIC_READER
Used if you want to implement a meida whose reader is created dynamically each time getReaderData() is called.

See Also:
AMedia(String,String,String,Reader)

_isdata

protected transient java.io.InputStream _isdata
The input stream, getStreamData()


_rddata

protected transient java.io.Reader _rddata
The input stream, getReaderData()

Constructor Detail

AMedia

public AMedia(java.lang.String name,
              java.lang.String format,
              java.lang.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(java.lang.String name,
              java.lang.String format,
              java.lang.String ctype,
              java.lang.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(java.lang.String name,
              java.lang.String format,
              java.lang.String ctype,
              java.io.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 dyanmically 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(java.lang.String name,
              java.lang.String format,
              java.lang.String ctype,
              java.io.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 dyanmically each tiime getReaderData() is called, you shall pass DYNAMIC_READER as the data argument. Then, override getReaderData() to return the correct reader.

AMedia

public AMedia(java.lang.String name,
              java.lang.String format,
              java.lang.String ctype,
              java.io.File file,
              boolean binary)
       throws java.io.FileNotFoundException
Construct with name, format, content type and a file.

Unlike others, it uses the so-called repetable 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:
java.io.FileNotFoundException

AMedia

public AMedia(java.lang.String name,
              java.lang.String format,
              java.lang.String ctype,
              java.io.File file,
              java.lang.String charset)
       throws java.io.FileNotFoundException
Construct with name, format, content type and a file.

Unlike others, it uses the so-called repetable 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:
java.io.FileNotFoundException

AMedia

public AMedia(java.io.File file,
              java.lang.String ctype,
              java.lang.String charset)
       throws java.io.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:
java.io.FileNotFoundException
Since:
3.0.8

AMedia

public AMedia(java.lang.String name,
              java.lang.String format,
              java.lang.String ctype,
              java.net.URL url,
              java.lang.String charset)
       throws java.io.FileNotFoundException
Construct with name, format, content type and URL.

Unlike others, it uses the so-called repetable 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:
java.io.FileNotFoundException
Since:
3.0.8

AMedia

public AMedia(java.net.URL url,
              java.lang.String ctype,
              java.lang.String charset)
       throws java.io.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:
java.io.FileNotFoundException
Since:
3.0.8
Method Detail

isBinary

public boolean isBinary()
Description copied from interface: Media
Returns whether the format of tis 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 java.lang.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 java.io.InputStream getStreamData()
Returns the input stream of this media.

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

Specified by:
getStreamData in interface Media
Throws:
java.lang.IllegalStateException - if the media is not binary isBinary().
See Also:
Media.getReaderData()

getReaderData

public java.io.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 getReaderData().

Specified by:
getReaderData in interface Media
Throws:
java.lang.IllegalStateException - if the media is binary isBinary().
See Also:
Media.getStreamData()

getName

public java.lang.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 java.lang.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 java.lang.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()

toString

public java.lang.String toString()
Overrides:
toString in class java.lang.Object


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