org.zkoss.image

Class AImage

java.lang.Object

org.zkoss.image.AImage

All Implemented Interfaces:

Serializable, Image, Media

public class AImage
extends Object
implements Image, Serializable

Represents an image. Unlike java.awt.Image and javax.swing.ImageIcon, this class holds the raw image data, i.e., the original format, as opaque.

In other words, it is used to retrieve and store the opaque data as polymorphic thru the Media interface.

To encode AWT image to an instance of Image, use Images.encode(java.lang.String, java.awt.image.RenderedImage, float, boolean).

Author:

tomyeh

See Also:

Images.encode(java.lang.String, java.awt.image.RenderedImage, float, boolean), Serialized Form

Constructor Summary

Constructors

Constructor and Description
AImage(File file) Constructs an image with a file.
AImage(String filename) Constructs an image with a file name.
AImage(String name, byte[] data) Constructs an image with a byte array.
AImage(String name, InputStream is) Constructs an image with an input stream.
AImage(URL url) Constructs an image with an URL.

Method Summary

Methods

Modifier and Type	Method and 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.
int	getHeight() Returns the height.
String	getName() Returns the name (usually filename) of this media, or null if not available.
Reader	getReaderData() Always throws IllegalStateException.
InputStream	getStreamData() An input stream on top of getByteData().
String	getStringData() Always throws IllegalStateException.
int	getWidth() Returns the width.
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.
ImageIcon	toImageIcon() Converts to an image icon.

Methods inherited from class java.lang.Object

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

Constructor Detail

AImage

public AImage(String name,
      byte[] data)
       throws IOException

Constructs an image with a byte array.

Throws:

IOException

AImage

public AImage(String name,
      InputStream is)
       throws IOException

Constructs an image with an input stream.

Note that this method automatically closes the input stream (since ZK 3.0.0).

Throws:

IOException

AImage

public AImage(String filename)
       throws IOException

Constructs an image with a file name.

Throws:

IOException

AImage

public AImage(File file)
       throws IOException

Constructs an image with a file.

Throws:

IOException

AImage

public AImage(URL url)
       throws IOException

Constructs an image with an URL.

Throws:

IOException

Method Detail

isBinary

public final 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 final 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 final String getStringData()

Always throws IllegalStateException.

Specified by:

getStringData in interface Media

See Also:

Media.getByteData()

getStreamData

public final InputStream getStreamData()

An input stream on top of getByteData().

Though harmless, the caller doesn't need to close the returned stream.

Specified by:

getStreamData in interface Media

See Also:

Media.getReaderData()

getReaderData

public final Reader getReaderData()

Always throws IllegalStateException.

Specified by:

getReaderData in interface Media

See Also:

Media.getStreamData()

getName

public final 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 final 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 final 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()

getWidth

public final int getWidth()

Returns the width.

Specified by:

getWidth in interface Image

getHeight

public final int getHeight()

Returns the height.

Specified by:

getHeight in interface Image

toImageIcon

public final ImageIcon toImageIcon()

Converts to an image icon.

Specified by:

toImageIcon in interface Image

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