visad.util
Class Util

java.lang.Object
  visad.util.Util

public class Util
extends Object

A hodge-podge of general utility methods.

Constructor Summary

Util()

Method Summary

static void	adjustComboBox(JComboBox combo) Limit the given combo box to one line in height.
static void	adjustTextField(JTextField field) Limit the given text field to one line in height.
static boolean	arraysEqual(Object[] o1, Object[] o2) Tests whether two arrays are component-wise equal.
static boolean	canDoHDF5() Test whether HDF-5 native code is present in this JVM.
static boolean	canDoImageJ() Test whether ImageJ is present in this JVM.
static boolean	canDoJAI() Test whether Java Advanced Imaging is present in this JVM.
static boolean	canDoJava3D() Test whether Java3D is present in this JVM.
static boolean	canDoJava3D(String version) Check to see if the version of Java3D being used is compatible with the desired specification version.
static boolean	canDoJPEG() Test whether javax.imageio can write JPEGs.
static boolean	canDoPython() Test whether Jython is present in this JVM.
static boolean	canDoQuickTime() Test whether QuickTime for Java is present in this JVM.
static void	captureDisplay(DisplayImpl display, String filename) Capture a DisplayImpl into a JPEG file
static void	captureDisplay(DisplayImpl display, String filename, boolean sync) Capture a DisplayImpl into a JPEG file
static void	centerWindow(Window window) Center the given window on the screen.
static void	centerWindow(Window parent, Window window) Center the given window within the specified parent window.
static double[][]	clone(double[][] input) do a deep clone
static float[][]	clone(float[][] input) do a deep clone
static Level	configureLogging(int verbosity)
static Level	configureLogging(int verbosity, String pkg) Configure basic logging for the visad package.
static ConstantMap[]	getColorMaps(Color color) Create a ConstantMap array of colors for use with Display.addReference(DataReference, ConstantMap[])
static String	getName(SceneGraphObject obj) Gets the name of the given SceneGraphObject.
static String	getStackTrace() Utility method to return the stack trace
static String	getTimestamp() Return a string representation of the current date and time.
static String	getVersionDate() Return a string representation of VisAD's build date and time.
static JFileChooser	getVisADFileChooser() Return a JFileChooser that recognizes supported VisAD file types.
static void	invoke(boolean wait, boolean printStackTraces, Runnable r) Executes the given Runnable object with the Swing event handling thread.
static void	invoke(boolean wait, Runnable r) Executes the given Runnable object with the Swing event handling thread.
static boolean	isApproximatelyEqual(double a, double b) Determine whether two numbers are roughly the same.
static boolean	isApproximatelyEqual(double a, double b, double epsilon) Determine whether two numbers are roughly the same.
static boolean	isApproximatelyEqual(float a, float b) Determine whether two numbers are roughly the same.
static boolean	isApproximatelyEqual(float a, float b, float epsilon) Determine whether two numbers are roughly the same.
static void	printArray(String prefix, double[] array) Print out the values in a double array.
static void	printArray(String prefix, Object[] array) Create a string representation of the given array
static void	printJ3DProperties(Canvas3D canvas) Print Java3D global and Canvas3D properties to System.err.
static void	printJ3DProperties(PrintStream str, Canvas3D canvas) Print Java3D properties.
static void	printSceneGraph(Node node)
static void	setName(SceneGraphObject obj, String name) Sets the name of the given SceneGraphObject.
static int	tenBitToTwoByte(byte[] input, short[] output) Convert 10-bit data to 2-byte data
static int	unsignedByteToInt(byte b) Converts an (unsigned) byte to an unsigned int.
static long	unsignedByteToLong(byte b) Converts an (unsigned) byte to an unsigned long.
static int	unsignedShortToInt(short s) Converts an (unsigned) byte to an unsigned int.

Methods inherited from class java.lang.Object

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

Constructor Detail

Util

public Util()

Method Detail

isApproximatelyEqual

public static boolean isApproximatelyEqual(float a,
                                           float b,
                                           float epsilon)

Determine whether two numbers are roughly the same.

Parameters:

a - First number

b - Second number

epsilon - Absolute amount by which they can differ.

Returns:

true if they're approximately equal.

isApproximatelyEqual

public static boolean isApproximatelyEqual(float a,
                                           float b)

Determine whether two numbers are roughly the same.

Parameters:

a - First number

b - Second number

Returns:

true if they're approximately equal.

isApproximatelyEqual

public static boolean isApproximatelyEqual(double a,
                                           double b,
                                           double epsilon)

Determine whether two numbers are roughly the same.

Parameters:

a - First number

b - Second number

epsilon - Absolute amount by which they can differ.

Returns:

true if they're approximately equal.

isApproximatelyEqual

public static boolean isApproximatelyEqual(double a,
                                           double b)

Determine whether two numbers are roughly the same.

Parameters:

a - First number

b - Second number

Returns:

true if they're approximately equal.

getVersionDate

public static String getVersionDate()

Return a string representation of VisAD's build date and time.

Returns:

VisAD build date and time

printJ3DProperties

public static void printJ3DProperties(PrintStream str,
                                      Canvas3D canvas)

Print Java3D properties.

Parameters:

str - Where to print properties.

canvas - The Canvas3D to get properties from. If null Canvas3D properties are skipped.

See Also:

printJ3DProperties(Canvas3D)

printJ3DProperties

public static void printJ3DProperties(Canvas3D canvas)

Print Java3D global and Canvas3D properties to System.err.

Parameters:

canvas - The Canvas3D to get properties from. If null Canvas3D properties are skipped.

See Also:

VirtualUniverse.getProperties(), Canvas3D.queryProperties()

printSceneGraph

public static void printSceneGraph(Node node)

Parameters:

node -

getName

public static String getName(SceneGraphObject obj)

Gets the name of the given SceneGraphObject. This method exists to avoid a compile-time dependency on Java3D 1.4+.

setName

public static void setName(SceneGraphObject obj,
                           String name)

Sets the name of the given SceneGraphObject. This method exists to avoid a compile-time dependency on Java3D 1.4+.

tenBitToTwoByte

public static int tenBitToTwoByte(byte[] input,
                                  short[] output)

Convert 10-bit data to 2-byte data

Parameters:

input -

output -

Returns:

0 if no errors

getTimestamp

public static String getTimestamp()

Return a string representation of the current date and time.

Returns:

string timestamp for current time

getVisADFileChooser

public static JFileChooser getVisADFileChooser()

Return a JFileChooser that recognizes supported VisAD file types.

Returns:

file chooser which recognizes supported VisAD file types

adjustTextField

public static void adjustTextField(JTextField field)

Limit the given text field to one line in height.

Parameters:

field -

adjustComboBox

public static void adjustComboBox(JComboBox combo)

Limit the given combo box to one line in height.

Parameters:

combo -

centerWindow

public static void centerWindow(Window window)

Center the given window on the screen.

Parameters:

window -

centerWindow

public static void centerWindow(Window parent,
                                Window window)

Center the given window within the specified parent window.

Parameters:

parent -

window -

canDoHDF5

public static boolean canDoHDF5()

Test whether HDF-5 native code is present in this JVM.

Returns:

true if found, otherwise false

canDoImageJ

public static boolean canDoImageJ()

Test whether ImageJ is present in this JVM.

Returns:

true if found, otherwise false

canDoJPEG

public static boolean canDoJPEG()

Test whether javax.imageio can write JPEGs.

Returns:

true if found, otherwise false

canDoJAI

public static boolean canDoJAI()

Test whether Java Advanced Imaging is present in this JVM.

Returns:

true if found, otherwise false

canDoPython

public static boolean canDoPython()

Test whether Jython is present in this JVM.

Returns:

true if found, otherwise false

canDoQuickTime

public static boolean canDoQuickTime()

Test whether QuickTime for Java is present in this JVM.

Returns:

true if found, otherwise false

canDoJava3D

public static boolean canDoJava3D()

Test whether Java3D is present in this JVM.

Returns:

true if found, otherwise false

canDoJava3D

public static boolean canDoJava3D(String version)

Check to see if the version of Java3D being used is compatible with the desired specification version.

Parameters:

version - version to check. Needs to conform to the dotted format of specification version numbers (e.g., 1.2)

Returns:

true if the Java3D version being used is greater than or equal to the desired version number

captureDisplay

public static void captureDisplay(DisplayImpl display,
                                  String filename)

Capture a DisplayImpl into a JPEG file

Parameters:

display - the DisplayImpl to capture

filename - the name of the file to write into

captureDisplay

public static void captureDisplay(DisplayImpl display,
                                  String filename,
                                  boolean sync)

Capture a DisplayImpl into a JPEG file

Parameters:

display - the DisplayImpl to capture

filename - the name of the file to write into

sync - ensure the display is "done" if true

arraysEqual

public static boolean arraysEqual(Object[] o1,
                                  Object[] o2)

Tests whether two arrays are component-wise equal.

Parameters:

o1 -

o2 -

Returns:

true if the arrays are equal

printArray

public static void printArray(String prefix,
                              Object[] array)

Create a string representation of the given array

Parameters:

prefix -

array - array to print

printArray

public static void printArray(String prefix,
                              double[] array)

Print out the values in a double array.

Parameters:

prefix - prefix string

array - array to print

invoke

public static void invoke(boolean wait,
                          Runnable r)

Executes the given Runnable object with the Swing event handling thread.

Parameters:

wait - true if method should block until Runnable code finishes execution.

r - Runnable object to execute using the event handling thread.

invoke

public static void invoke(boolean wait,
                          boolean printStackTraces,
                          Runnable r)

Executes the given Runnable object with the Swing event handling thread.

Parameters:

wait - true if method should block until Runnable code finishes execution.

printStackTraces - true if the stack trace for any exception should be printed.

r - Runnable object to execute using the event handling thread.

getColorMaps

public static ConstantMap[] getColorMaps(Color color)
                                  throws VisADException

Create a ConstantMap array of colors for use with Display.addReference(DataReference, ConstantMap[])

Parameters:

color - color to encode

Returns:

an array containing either 3 colors or, if the color parameter included an alpha component, a 4 element array with 3 colors and an @{link Display.Alpha alpha} component.

Throws:

VisADException

configureLogging

public static Level configureLogging(int verbosity,
                                     String pkg)

Configure basic logging for the visad package. In a production environment the preferred way to configure logging is using the logging.properties file. This is intended only as a convenience method for configuring console logging for the purposes of testing.

Parameters:

verbosity - 0 is Level.WARNING and progresses to a maximum of Level.ALL.

pkg - Name of the java package to configure logging for.

Returns:

The Level logging was set to.

configureLogging

public static Level configureLogging(int verbosity)

Parameters:

verbosity -

Returns:

logging level

See Also:

configureLogging(int, java.lang.String)

getStackTrace

public static String getStackTrace()

Utility method to return the stack trace

Returns:

The stack trace

clone

public static float[][] clone(float[][] input)

do a deep clone

Parameters:

input - the array

Returns:

cloned array

clone

public static double[][] clone(double[][] input)

do a deep clone

Parameters:

input - the array

Returns:

cloned array

unsignedShortToInt

public static int unsignedShortToInt(short s)

Converts an (unsigned) byte to an unsigned int. Since Java doesn't have an unsigned byte type, this requires some foolery. This solution based on information and code from http://www.rgagnon.com/javadetails/java-0026.html

Parameters:

s - The unsigned short to convert

Returns:

the unsigned int equivalent

unsignedByteToInt

public static int unsignedByteToInt(byte b)

Converts an (unsigned) byte to an unsigned int. Since Java doesn't have an unsigned byte type, this requires some foolery. This solution based on information and code from http://www.rgagnon.com/javadetails/java-0026.html

Parameters:

b - The unsigned byte to convert

Returns:

the unsigned int equivalent

unsignedByteToLong

public static long unsignedByteToLong(byte b)

Converts an (unsigned) byte to an unsigned long. Since Java doesn't have an unsigned byte type, this requires some foolery. This solution based on information and code from http://www.rgagnon.com/javadetails/java-0026.html

Parameters:

b - The unsigned byte to convert

Returns:

the unsigned long equivalent