Package uk.ac.starlink.datanode.nodes
Class NodeUtil
- java.lang.Object
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- uk.ac.starlink.datanode.nodes.NodeUtil
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public class NodeUtil extends java.lang.Object
Miscellaneous utilities.
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Constructor Summary
Constructors Constructor Description NodeUtil()
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static java.lang.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
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 java.lang.String
toString(DataNode node)
Returns a short string representation of a DataNode.
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Method Detail
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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
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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
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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
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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
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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
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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
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getNodePath
public static java.lang.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
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toString
public static java.lang.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
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