uk.ac.starlink.datanode.nodes

Class NodeUtil

java.lang.Object

uk.ac.starlink.datanode.nodes.NodeUtil

public class NodeUtil
extends Object

Miscellaneous utilities.

Constructor Summary

Constructors

Constructor and Description
NodeUtil()

Method Summary

Modifier and Type	Method and Description
static String	getNodePath(DataNode node) Returns the full path of a node, if possible.
static boolean	hasAST() Indicates whether the JNIAST package is present.
static boolean	hasGUI() Indicates whether applications within this JVM should be considered to be running within a graphical context or not.
static boolean	hasHDS() Indicates whether the JNIHDS package is present.
static boolean	hasJAI() Indicates whether the Java Advanced Imaging classes are available.
static boolean	hasTAMFITS() Indicates whether the nom.tam.fits FITS I/O library is available.
static boolean	isASCII(byte[] buf) Indicates whether the bytes in a given buffer look like ASCII text or not.
static void	setGUI(boolean hasGUI) Sets whether applications running within this JVM should be considered to be running within a GUI or not.
static String	toString(DataNode node) Returns a short string representation of a DataNode.

Methods inherited from class java.lang.Object

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

Constructor Detail

NodeUtil

public NodeUtil()

Method Detail

isASCII

public static boolean isASCII(byte[] buf)

Indicates whether the bytes in a given buffer look like ASCII text or not. This is just a guess based on what characters are in there.

Parameters:

buf - the buffer to test

Returns:

true iff buf looks like ASCII

hasHDS

public static boolean hasHDS()

Indicates whether the JNIHDS package is present. It might not be if the native libraries for this platform have not been installed.

Returns:

true iff JNIDHS is availble

hasAST

public static boolean hasAST()

Indicates whether the JNIAST package is present. It might not be if the native libraries for this platform have not been installed.

Returns:

true iff JNIAST is available

hasJAI

public static boolean hasJAI()

Indicates whether the Java Advanced Imaging classes are available. These are an extension to the J2SE1.4, so may not be present if they have not been installed.

Returns:

true iff JAI is available

hasTAMFITS

public static boolean hasTAMFITS()

Indicates whether the nom.tam.fits FITS I/O library is available.

Returns:

true iff nom.tam.fits is available

hasGUI

public static boolean hasGUI()

Indicates whether applications within this JVM should be considered to be running within a graphical context or not.

Returns:

true iff this JVM appears to be using graphical components

setGUI

public static void setGUI(boolean hasGUI)

Sets whether applications running within this JVM should be considered to be running within a GUI or not.

Parameters:

hasGUI - true iff this JVM ought to be using graphical components

getNodePath

public static String getNodePath(DataNode node)

Returns the full path of a node, if possible. The idea is to give a human-readable string indictating what you're looking at, describing position within filesystem, tar archive, XML document, whatever.

Parameters:

node - node to trace

Returns:

node path, or null

toString

public static String toString(DataNode node)

Returns a short string representation of a DataNode. This is suitable for use as the string used in rendering the node in the tree.

Returns:

a string summarising the node