com.knowgate.hipergate
Class Image

java.lang.Object
  com.knowgate.dataobjs.DBPersist
      com.knowgate.hipergate.Image

All Implemented Interfaces:

java.io.Serializable, java.util.Map

public class Image
extends DBPersist

Simple imaging transformations

See Also:

Image, Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

java.util.Map.Entry<K,V>

Field Summary

static short	ClassId
static int	USE_AWT
static int	USE_JAI

Fields inherited from class com.knowgate.dataobjs.DBPersist

AllVals, sAuditCls, sAuditUsr, sTransactId

Constructor Summary

Image()
Create empty image, use AWT imaging routines.

Image(java.awt.Image oAWTImage, java.lang.String sImagePath, int iLibrary)
Load Image directly from a Java AWT abstract Image

Image(int iLibraryCode)
Create empty image.

Image(JDCConnection oConn, java.io.File oFile, java.lang.String sFilePath)
Load Image properties from database using file path as key.

Image(JDCConnection oConn, java.lang.String sImageId)
Load image properties from database.

Method Summary

static byte[]	blankGIF() Get a transparent GIF image that can be served throught a JSP page Use code like response.setContentType("image/gif"); OutputStream oOut = response.getOutputStream(); oOut.write(Image.blankGIF()); oOut.flush();
byte[]	createThumbBitmap(int iThumbWidth, int iThumbHeight, float fQuality) Resample image.
void	createThumbFile(java.lang.String sOutputPath, int iThumbWidth, int iThumbHeight, float fQuality) Resample image.
boolean	delete(JDCConnection oConn) Delete Image from database and from disk.
boolean	dimensions() Get image dimensions.
java.lang.String	getImageCodec()
java.lang.String	getImageType() Get image file extension in lowercase.
int	getImagingLibrary() Get active imaging library.
static void	main(java.lang.String[] argv) Image command line interface
void	setImagingLibrary(int iLibraryCode) Set imaging library to use.
boolean	store(JDCConnection oConn) Store image properties at database.
void	write(java.io.OutputStream oOut) Encode Image and write it to an OutputStream

Methods inherited from class com.knowgate.dataobjs.DBPersist

allcaps, allcaps, changelog, clear, clone, containsKey, containsValue, entrySet, exists, get, get, getAuditClassName, getCreationDate, getDate, getDateFormated, getDateShort, getDateTime, getDateTime24, getDecimal, getDecimalFormated, getDecimalFormated, getDouble, getDoubleFormated, getFloat, getFloatFormated, getInt, getInteger, getIntervalPart, getItemMap, getItems, getMoney, getShort, getSQLDate, getSQLTime, getString, getStringHtml, getStringNull, getTable, getTable, getTableName, getTime, getTimeOfDay, getTimestamp, getUIdFromName, isEmpty, isNull, iterator, keySet, load, load, parseXML, put, put, put, put, put, put, put, put, put, put, put, put, put, put, put, put, put, putAll, putAll, remove, remove, replace, replace, replace, replace, replace, replace, replace, replace, setAuditTransact, setAuditUser, setCreationDate, size, toLowerCase, toUpperCase, toXML, toXML, toXML, toXML, values

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

equals, hashCode

Field Detail

USE_AWT

public static final int USE_AWT

See Also:

Constant Field Values

USE_JAI

public static final int USE_JAI

See Also:

Constant Field Values

ClassId

public static final short ClassId

See Also:

Constant Field Values

Constructor Detail

Image

public Image()

Create empty image, use AWT imaging routines.

Image

public Image(int iLibraryCode)
      throws java.lang.IllegalArgumentException

Create empty image.

Parameters:

iLibraryCode - Imaging library to use. Either USE_AWT or USE_JAI.

Throws:

java.lang.IllegalArgumentException

Image

public Image(JDCConnection oConn,
             java.lang.String sImageId)
      throws java.sql.SQLException

Load image properties from database.

Parameters:

oConn - Database Connection.

sImageId - Image GUID at k_images table.

Throws:

java.sql.SQLException

Image

public Image(java.awt.Image oAWTImage,
             java.lang.String sImagePath,
             int iLibrary)

Load Image directly from a Java AWT abstract Image

Parameters:

oAWTImage - java.awt.Image object

sImagePath - Optional. Path to image file name.

iLibraryCode - Imaging library to use. Either USE_AWT or USE_JAI.

Image

public Image(JDCConnection oConn,
             java.io.File oFile,
             java.lang.String sFilePath)
      throws java.sql.SQLException

Load Image properties from database using file path as key.

This method searched a file path into field path_image from k_images table.

Parameters:

oConn - Database Connection

oFile - Image File Object

sFilePath - Full path to Image File (as stored at k_images.path_image)

Throws:

java.sql.SQLException

Method Detail

setImagingLibrary

public void setImagingLibrary(int iLibraryCode)

Set imaging library to use.

On many systems it is neccesary to have X-Windows started for being able to use AWT imaging routines.

Parameters:

iLibraryCode - USE_AWT or USE_JAI

See Also:

http://java.sun.com/products/java-media/jai/, http://java.sun.com/j2se/1.4.2/docs/api/

getImagingLibrary

public int getImagingLibrary()

Get active imaging library.

Returns:

USE_AWT or USE_JAI

store

public boolean store(JDCConnection oConn)
              throws java.sql.SQLException,
                     java.lang.UnsatisfiedLinkError,
                     java.lang.NoClassDefFoundError

Store image properties at database.

The image itself is kept as a disk file pointe by path_file field.
On saving the Image a GUID is automatically assigned if one is not provided.
Image file length, width and height are saved to len_file, dm_width and dm_height fields.
Only GIF 89a and JPG/JPEG images are recognized for automatic dimensions computation.

Overrides:

store in class DBPersist

Parameters:

oConn - Database Connection

Returns:

boolean true if register was stored for the first time, false if register already existed.

Throws:

java.sql.SQLException

java.lang.NoClassDefFoundError

java.lang.UnsatisfiedLinkError - hen JAI native libraries (*_jai.so) are not installed Sun JAI tries to use AWT which is slower but more compatible. Some libraries of AWT are requiered. Particularly from Fedora Core 2:
xorg-x11-devel (contains libXp.so, requiered by libawt.so), fontconfig, fontconfig-devel, xorg-x11-libs, xorg-x11-libs-data, xorg-x11-Mesa-libGL

delete

public boolean delete(JDCConnection oConn)
               throws java.sql.SQLException

Delete Image from database and from disk.

Overrides:

delete in class DBPersist

Parameters:

oConn - Database Connection

Returns:

true if register was successfully erased, false if not.

Throws:

java.sql.SQLException

getImageType

public java.lang.String getImageType()

Get image file extension in lowercase.

getImageCodec

public java.lang.String getImageCodec()

dimensions

public boolean dimensions()
                   throws java.io.IOException,
                          java.io.FileNotFoundException,
                          java.lang.ArrayIndexOutOfBoundsException,
                          java.lang.UnsatisfiedLinkError,
                          java.lang.NullPointerException

Get image dimensions.

Dimensions are stored at dm_width and dm_height properties.
Only GIF 89a and JPG/JPEG images are supported

Returns:

true if dimensions where successfully computed, false if routine was unable to recognize file format.

Throws:

java.io.IOException

java.io.FileNotFoundException

java.lang.ArrayIndexOutOfBoundsException

java.lang.NullPointerException

java.lang.UnsatisfiedLinkError - When JAI native libraries (*_jai.so) are not installed Sun JAI tries to use AWT which is slower but more compatible. Some libraries of AWT are requiered. Particularly from Fedora Core 2:
xorg-x11-devel (contains libXp.so, requiered by libawt.so), fontconfig, fontconfig-devel, xorg-x11-libs, xorg-x11-libs-data, xorg-x11-Mesa-libGL

createThumbBitmap

public byte[] createThumbBitmap(int iThumbWidth,
                                int iThumbHeight,
                                float fQuality)
                         throws java.lang.NullPointerException,
                                java.io.IOException,
                                java.lang.InterruptedException,
                                java.lang.InstantiationException

Resample image.

Parameters:

iThumbWidth - Desired width

iThumbHeight - Desired height

fQuality - JPG Quality [1..100]

Returns:

Byte array holding the generated JPEG image

Throws:

java.lang.NullPointerException

java.io.IOException

java.lang.InterruptedException

java.lang.InstantiationException

createThumbFile

public void createThumbFile(java.lang.String sOutputPath,
                            int iThumbWidth,
                            int iThumbHeight,
                            float fQuality)
                     throws java.lang.NullPointerException,
                            java.lang.InterruptedException,
                            java.io.IOException,
                            java.lang.InstantiationException

Resample image.

Parameters:

sOutputPath - File path where generated JPEG shall be saved.

iThumbWidth - Desired width

iThumbHeight - Desired height

fQuality - JPG Quality [1..100]

Throws:

java.lang.NullPointerException

java.io.IOException

java.lang.InstantiationException

java.lang.InterruptedException

java.lang.InstantiationException

write

public void write(java.io.OutputStream oOut)
           throws java.lang.NullPointerException,
                  java.io.IOException,
                  java.lang.InstantiationException,
                  java.lang.InterruptedException

Encode Image and write it to an OutputStream

Parameters:

oOut - OutputStream

Throws:

java.lang.NullPointerException - If underlying java.awt.Image object is null

java.io.IOException

java.lang.InstantiationException

java.lang.InterruptedException

blankGIF

public static byte[] blankGIF()

Get a transparent GIF image that can be served throught a JSP page

Use code like response.setContentType("image/gif"); OutputStream oOut = response.getOutputStream(); oOut.write(Image.blankGIF()); oOut.flush();

Returns:

byte[]

Since:

3.0

main

public static void main(java.lang.String[] argv)
                 throws java.lang.NumberFormatException,
                        java.lang.InstantiationException,
                        java.lang.InterruptedException,
                        java.io.FileNotFoundException,
                        java.io.IOException

Image command line interface

Parameters:

argv - [jai|awt] thumbnail path_original path_new_thumbnail int_thumb_width int_thumb_height float_quality
Options:
jai -> Use SUN Java Advanced Imaging (requires SUN's libraries
awt -> Use Abstract Windowing Toolkit (requires X-Windows or Win32)
path_original -> Full path to original .GIF or .JPEG image
path_new_thumbnail -> Full path to generated thumbnail
int_thumb_width -> Thumbnail width"); int_thumb_height -> Thumbnail height
float_quality -> JPEG quality for thumbnail [0..100]

Throws:

java.lang.NumberFormatException

java.lang.InstantiationException

java.lang.InterruptedException

java.io.FileNotFoundException

java.io.IOException