Utilities (NetBeans Utilities API) - NetBeans API Javadoc 5.5.0

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org.openide.util 6.8.22

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org.openide.util
Class Utilities

java.lang.Object
  org.openide.util.Utilities

public final class Utilities
extends Object
extends Object

Otherwise uncategorized useful static methods.

Nested Class Summary

static class Utilities.UnorderableException
          Deprecated. Used only by the deprecated partialSort

Field Summary

static int OS_AIX
          Operating system is IBM AIX.

static int OS_DEC
          Deprecated. please use OS_TRU64 instead

static int OS_FREEBSD
          Operating system is FreeBSD

static int OS_HP
          Operating system is HP-UX.

static int OS_IRIX
          Operating system is SGI IRIX.

static int OS_LINUX
          Operating system is Linux.

static int OS_MAC
          Operating system is Mac.

static int OS_OS2
          Operating system is OS/2.

static int OS_OTHER
          Operating system is unknown.

static int OS_SOLARIS
          Operating system is Solaris.

static int OS_SUNOS
          Operating system is Sun OS.

static int OS_TRU64
          Operating system is Compaq TRU64 Unix

static int OS_UNIX_MASK
          A mask for Unix platforms.

static int OS_VMS
          Operating system is Compaq OpenVMS

static int OS_WIN_OTHER
          Operating system is one of the Windows variants but we don't know which one it is

static int OS_WIN2000
          Operating system is Windows 2000.

static int OS_WIN95
          Operating system is Windows 95.

static int OS_WIN98
          Operating system is Windows 98.

static int OS_WINDOWS_MASK
          A mask for Windows platforms.

static int OS_WINNT
          Operating system is Windows NT.

static int TYPICAL_WINDOWS_TASKBAR_HEIGHT
          A height of the windows's taskbar

Method Summary

static Lookup actionsGlobalContext()
          Global context for actions.

static JPopupMenu actionsToPopup(Action[] actions, Component component)
          Builds a popup menu for provided component.

static JPopupMenu actionsToPopup(Action[] actions, Lookup context)
          Builds a popup menu from actions for provided context specified by Lookup.

static ReferenceQueue activeReferenceQueue()
          Useful queue for all parts of system that use java.lang.ref.References together with some ReferenceQueue and need to do some clean up when the reference is enqued.

static int arrayHashCode(Object[] arr)
          Compute hash code of array.

static void attachInitJob(Component comp4Init, AsyncGUIJob initJob)
          Attaches asynchronous init job to given component.

static boolean compareObjects(Object o1, Object o2)
          Safe equality check.

static boolean compareObjectsImpl(Object o1, Object o2, int checkArraysDepth)
          Safe equality check with array recursion.

static Cursor createCustomCursor(Component component, Image icon, String name)


static Cursor createProgressCursor(Component component)
          Returns a cursor with an arrow and an hourglass (or stop watch) badge, to be used when a component is busy but the UI is still responding to the user.

static String escapeParameters(String[] params)
          Complementary method to parseParameters

static Rectangle findCenterBounds(Dimension componentSize)
          Helps client code place components on the center of the screen.

static BeanInfo getBeanInfo(Class clazz)
          Central method for obtaining BeanInfo for potential JavaBean classes.

static BeanInfo getBeanInfo(Class clazz, Class stopClass)
          Central method for obtaining BeanInfo for potential JavaBean classes, with a stop class.

static String getClassName(Class clazz)
          Assemble a human-presentable class name for a specified class.

static Component getFocusTraversableComponent(Component c)
          Find a focus-traverable component.

static Class getObjectType(Class c)
          Get the object type for given primitive type.

static int getOperatingSystem()
          Get the operating system on which the IDE is running.

static Class getPrimitiveType(Class c)
          Get the primitive type for given object type.

static Dimension getScreenSize()
          Deprecated. this method is almost useless in multiple monitor configuration

static String getShortClassName(Class clazz)
          Assemble a human-presentable class name for a specified class (omitting the package).

static Rectangle getUsableScreenBounds()
          Returns the usable area of the screen where applications can place its windows.

static Rectangle getUsableScreenBounds(GraphicsConfiguration gconf)
          Returns the usable area of the screen where applications can place its windows.

static boolean isJavaIdentifier(String id)
          Test whether a given string is a valid Java identifier.

static boolean isLargeFrameIcons()
          Test whether the operating system supports icons on frames (windows).

static boolean isUnix()
          Test whether the IDE is running on some variant of Unix.

static boolean isWindows()
          Test whether the IDE is running on some variant of Windows.

static String keyToString(KeyStroke stroke)
          Converts a Swing key stroke descriptor to a familiar Emacs-like name.

static Image loadImage(String resourceID)
          Loads an image from the specified resource ID.

static Image loadImage(String resource, boolean localized)
          Loads an image based on resource path.

static Image mergeImages(Image image1, Image image2, int x, int y)
          This method merges two images into the new one.

static String[] parseParameters(String s)
          Parses parameters from a given string in shell-like manner.

static List partialSort(List l, Comparator c, boolean stable)
          Deprecated. Deprecated in favor of the potentially much faster (and possibly more correct) topologicalSort(java.util.Collection, java.util.Map).

static String pureClassName(String fullName)
          Turn full name of an inner class into its pure form.

static String replaceString(String original, String replaceFrom, String replaceTo)
          Search-and-replace fixed string matches within a string.

static int showJFileChooser(JFileChooser chooser, Component parent, String approveButtonText)
          Deprecated. Not needed in JDK 1.4.

static KeyStroke stringToKey(String s)
          Construct a new key description from a given universal string description.

static KeyStroke[] stringToKeys(String s)
          Convert a space-separated list of user-friendly key binding names to a list of Swing key strokes.

static File toFile(URL u)
          Deprecated. Use URI.URI(String) and File.File(URI) instead under JDK 1.4. (There was no proper equivalent under JDK 1.3.)

static Object[] toObjectArray(Object array)
          Convert an array of primitive types to an array of objects.

static List topologicalSort(Collection c, Map edges)
          Topologically sort some objects.

static Object toPrimitiveArray(Object[] array)
          Convert an array of objects to an array of primitive types.

static URL toURL(File f)
          Deprecated. Use File.toURI() and URI.toURL() instead under JDK 1.4. (File.toURL() is buggy in JDK 1.3 and the bugs are not fixed in JDK 1.4.)

static String translate(String className)
          Provides support for parts of the system that deal with classnames (use Class.forName, NbObjectInputStream, etc.).

static String wrapString(String original, int width, boolean wrapWords, boolean removeNewLines)
          Deprecated. Use (String, int, BreakIterator, boolean) as it is friendlier to I18N.

static String wrapString(String original, int width, BreakIterator breakIterator, boolean removeNewLines)
          Wrap multi-line strings.

static String[] wrapStringToArray(String original, int width, boolean wrapWords, boolean removeNewLines)
          Deprecated. use wrapStringToArray(String, int, BreakIterator, boolean) since it is better for I18N

static String[] wrapStringToArray(String original, int width, BreakIterator breakIterator, boolean removeNewLines)
          Wrap multi-line strings (and get the individual lines).

Methods inherited from class java.lang.Object

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

Nested Class Summary
`static class`	`Utilities.UnorderableException` Deprecated. Used only by the deprecated partialSort

Field Summary
`static int`	`OS_AIX` Operating system is IBM AIX.
`static int`	`OS_DEC` Deprecated. please use OS_TRU64 instead
`static int`	`OS_FREEBSD` Operating system is FreeBSD
`static int`	`OS_HP` Operating system is HP-UX.
`static int`	`OS_IRIX` Operating system is SGI IRIX.
`static int`	`OS_LINUX` Operating system is Linux.
`static int`	`OS_MAC` Operating system is Mac.
`static int`	`OS_OS2` Operating system is OS/2.
`static int`	`OS_OTHER` Operating system is unknown.
`static int`	`OS_SOLARIS` Operating system is Solaris.
`static int`	`OS_SUNOS` Operating system is Sun OS.
`static int`	`OS_TRU64` Operating system is Compaq TRU64 Unix
`static int`	`OS_UNIX_MASK` A mask for Unix platforms.
`static int`	`OS_VMS` Operating system is Compaq OpenVMS
`static int`	`OS_WIN_OTHER` Operating system is one of the Windows variants but we don't know which one it is
`static int`	`OS_WIN2000` Operating system is Windows 2000.
`static int`	`OS_WIN95` Operating system is Windows 95.
`static int`	`OS_WIN98` Operating system is Windows 98.
`static int`	`OS_WINDOWS_MASK` A mask for Windows platforms.
`static int`	`OS_WINNT` Operating system is Windows NT.
`static int`	`TYPICAL_WINDOWS_TASKBAR_HEIGHT` A height of the windows's taskbar

Method Summary
`static Lookup`	`actionsGlobalContext()` Global context for actions.
`static JPopupMenu`	`actionsToPopup(Action[] actions, Component component)` Builds a popup menu for provided component.
`static JPopupMenu`	`actionsToPopup(Action[] actions, Lookup context)` Builds a popup menu from actions for provided context specified by `Lookup`.
`static ReferenceQueue`	`activeReferenceQueue()` Useful queue for all parts of system that use `java.lang.ref.Reference`s together with some `ReferenceQueue` and need to do some clean up when the reference is enqued.
`static int`	`arrayHashCode(Object[] arr)` Compute hash code of array.
`static void`	`attachInitJob(Component comp4Init, AsyncGUIJob initJob)` Attaches asynchronous init job to given component.
`static boolean`	`compareObjects(Object o1, Object o2)` Safe equality check.
`static boolean`	`compareObjectsImpl(Object o1, Object o2, int checkArraysDepth)` Safe equality check with array recursion.
`static Cursor`	`createCustomCursor(Component component, Image icon, String name)`
`static Cursor`	`createProgressCursor(Component component)` Returns a cursor with an arrow and an hourglass (or stop watch) badge, to be used when a component is busy but the UI is still responding to the user.
`static String`	`escapeParameters(String[] params)` Complementary method to parseParameters
`static Rectangle`	`findCenterBounds(Dimension componentSize)` Helps client code place components on the center of the screen.
`static BeanInfo`	`getBeanInfo(Class clazz)` Central method for obtaining `BeanInfo` for potential JavaBean classes.
`static BeanInfo`	`getBeanInfo(Class clazz, Class stopClass)` Central method for obtaining `BeanInfo` for potential JavaBean classes, with a stop class.
`static String`	`getClassName(Class clazz)` Assemble a human-presentable class name for a specified class.
`static Component`	`getFocusTraversableComponent(Component c)` Find a focus-traverable component.
`static Class`	`getObjectType(Class c)` Get the object type for given primitive type.
`static int`	`getOperatingSystem()` Get the operating system on which the IDE is running.
`static Class`	`getPrimitiveType(Class c)` Get the primitive type for given object type.
`static Dimension`	`getScreenSize()` Deprecated. this method is almost useless in multiple monitor configuration
`static String`	`getShortClassName(Class clazz)` Assemble a human-presentable class name for a specified class (omitting the package).
`static Rectangle`	`getUsableScreenBounds()` Returns the usable area of the screen where applications can place its windows.
`static Rectangle`	`getUsableScreenBounds(GraphicsConfiguration gconf)` Returns the usable area of the screen where applications can place its windows.
`static boolean`	`isJavaIdentifier(String id)` Test whether a given string is a valid Java identifier.
`static boolean`	`isLargeFrameIcons()` Test whether the operating system supports icons on frames (windows).
`static boolean`	`isUnix()` Test whether the IDE is running on some variant of Unix.
`static boolean`	`isWindows()` Test whether the IDE is running on some variant of Windows.
`static String`	`keyToString(KeyStroke stroke)` Converts a Swing key stroke descriptor to a familiar Emacs-like name.
`static Image`	`loadImage(String resourceID)` Loads an image from the specified resource ID.
`static Image`	`loadImage(String resource, boolean localized)` Loads an image based on resource path.
`static Image`	`mergeImages(Image image1, Image image2, int x, int y)` This method merges two images into the new one.
`static String[]`	`parseParameters(String s)` Parses parameters from a given string in shell-like manner.
`static List`	`partialSort(List l, Comparator c, boolean stable)` Deprecated. Deprecated in favor of the potentially much faster (and possibly more correct) `topologicalSort(java.util.Collection, java.util.Map)`.
`static String`	`pureClassName(String fullName)` Turn full name of an inner class into its pure form.
`static String`	`replaceString(String original, String replaceFrom, String replaceTo)` Search-and-replace fixed string matches within a string.
`static int`	`showJFileChooser(JFileChooser chooser, Component parent, String approveButtonText)` Deprecated. Not needed in JDK 1.4.
`static KeyStroke`	`stringToKey(String s)` Construct a new key description from a given universal string description.
`static KeyStroke[]`	`stringToKeys(String s)` Convert a space-separated list of user-friendly key binding names to a list of Swing key strokes.
`static File`	`toFile(URL u)` Deprecated. Use `URI.URI(String)` and `File.File(URI)` instead under JDK 1.4. (There was no proper equivalent under JDK 1.3.)
`static Object[]`	`toObjectArray(Object array)` Convert an array of primitive types to an array of objects.
`static List`	`topologicalSort(Collection c, Map edges)` Topologically sort some objects.
`static Object`	`toPrimitiveArray(Object[] array)` Convert an array of objects to an array of primitive types.
`static URL`	`toURL(File f)` Deprecated. Use `File.toURI()` and `URI.toURL()` instead under JDK 1.4. (`File.toURL()` is buggy in JDK 1.3 and the bugs are not fixed in JDK 1.4.)
`static String`	`translate(String className)` Provides support for parts of the system that deal with classnames (use `Class.forName`, `NbObjectInputStream`, etc.).
`static String`	`wrapString(String original, int width, boolean wrapWords, boolean removeNewLines)` Deprecated. Use `(String, int, BreakIterator, boolean)` as it is friendlier to I18N.
`static String`	`wrapString(String original, int width, BreakIterator breakIterator, boolean removeNewLines)` Wrap multi-line strings.
`static String[]`	`wrapStringToArray(String original, int width, boolean wrapWords, boolean removeNewLines)` Deprecated. use `wrapStringToArray(String, int, BreakIterator, boolean)` since it is better for I18N
`static String[]`	`wrapStringToArray(String original, int width, BreakIterator breakIterator, boolean removeNewLines)` Wrap multi-line strings (and get the individual lines).

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

OS_WINNT

public static final int OS_WINNT

Operating system is Windows NT.

See Also:: Constant Field Values

OS_WIN95

public static final int OS_WIN95

Operating system is Windows 95.

See Also:: Constant Field Values

OS_WIN98

public static final int OS_WIN98

Operating system is Windows 98.

See Also:: Constant Field Values

OS_SOLARIS

public static final int OS_SOLARIS

Operating system is Solaris.

See Also:: Constant Field Values

OS_LINUX

public static final int OS_LINUX

Operating system is Linux.

See Also:: Constant Field Values

OS_HP

public static final int OS_HP

Operating system is HP-UX.

See Also:: Constant Field Values

OS_AIX

public static final int OS_AIX

Operating system is IBM AIX.

See Also:: Constant Field Values

OS_IRIX

public static final int OS_IRIX

Operating system is SGI IRIX.

See Also:: Constant Field Values

OS_SUNOS

public static final int OS_SUNOS

Operating system is Sun OS.

See Also:: Constant Field Values

OS_TRU64

public static final int OS_TRU64

Operating system is Compaq TRU64 Unix

See Also:: Constant Field Values

OS_DEC

public static final int OS_DEC

Deprecated. please use OS_TRU64 instead

See Also:: Constant Field Values

OS_OS2

public static final int OS_OS2

Operating system is OS/2.

See Also:: Constant Field Values

OS_MAC

public static final int OS_MAC

Operating system is Mac.

See Also:: Constant Field Values

OS_WIN2000

public static final int OS_WIN2000

Operating system is Windows 2000.

See Also:: Constant Field Values

OS_VMS

public static final int OS_VMS

Operating system is Compaq OpenVMS

See Also:: Constant Field Values

OS_WIN_OTHER

public static final int OS_WIN_OTHER

Operating system is one of the Windows variants but we don't know which one it is

See Also:: Constant Field Values

OS_OTHER

public static final int OS_OTHER

Operating system is unknown.

See Also:: Constant Field Values

OS_FREEBSD

public static final int OS_FREEBSD

Operating system is FreeBSD

Since:: 4.50
See Also:: Constant Field Values

OS_WINDOWS_MASK

public static final int OS_WINDOWS_MASK

A mask for Windows platforms.

See Also:: Constant Field Values

OS_UNIX_MASK

public static final int OS_UNIX_MASK

A mask for Unix platforms.

See Also:: Constant Field Values

TYPICAL_WINDOWS_TASKBAR_HEIGHT

public static final int TYPICAL_WINDOWS_TASKBAR_HEIGHT

A height of the windows's taskbar

See Also:: Constant Field Values

Method Detail

activeReferenceQueue

public static ReferenceQueue activeReferenceQueue()

Useful queue for all parts of system that use java.lang.ref.References together with some ReferenceQueue and need to do some clean up when the reference is enqued. Usually, in order to be notified about that, one needs to either create a dedicated thread that blocks on the queue and is Object.notify-ed, which is the right approach but consumes valuable system resources (threads) or one can peridically check the content of the queue by RequestProcessor.Task.schedule which is completelly wrong, because it wakes up the system every (say) 15 seconds. In order to provide useful support for this problem, this queue has been provided.

If you have a reference that needs clean up, make it implement Runnable inteface and register it with the activeReferenceQueue:

 class MyReference extends WeakReference implements Runnable {
   private Object dataToCleanUp;

   public MyReference (Object ref, Object data) {
     super (ref, Utilities.activeReferenceQueue ()); // here you specify the queue
     dataToCleanUp = data;
   }

   public void run () {
     // clean up your data
   }
 }

When the ref object is garbage collected, your run method will be invoked by calling ((Runnable)reference).run () and you can perform what ever cleanup is necessary. Be sure not to block in such cleanup for a long time as this prevents other waiting references to cleanup themselves.

Please do not call any methods of the ReferenceQueue yourself. They will throw exceptions.

Since:: 3.11

getOperatingSystem

public static final int getOperatingSystem()

Get the operating system on which the IDE is running.

Returns:: one of the OS_* constants (such as OS_WINNT)

isWindows

public static final boolean isWindows()

Test whether the IDE is running on some variant of Windows.

Returns:: true if Windows, false if some other manner of operating system

isUnix

public static final boolean isUnix()

Test whether the IDE is running on some variant of Unix. Linux is included as well as the commercial vendors.

Returns:: true some sort of Unix, false if some other manner of operating system

isJavaIdentifier

public static final boolean isJavaIdentifier(String id)

Test whether a given string is a valid Java identifier.

Parameters:: id - string which should be checked
Returns:: true if a valid identifier

getBeanInfo

public static BeanInfo getBeanInfo(Class clazz)
                            throws IntrospectionException

Central method for obtaining BeanInfo for potential JavaBean classes.

Parameters:: clazz - class of the bean to provide the BeanInfo for
Returns:: the bean info
Throws:: IntrospectionException - for the usual reasons
See Also:: Introspector.getBeanInfo(Class)

getBeanInfo

public static BeanInfo getBeanInfo(Class clazz,
                                   Class stopClass)
                            throws IntrospectionException

Central method for obtaining BeanInfo for potential JavaBean classes, with a stop class.

Parameters:: clazz - class of the bean to provide the BeanInfo for; stopClass - the stop class
Returns:: the bean info
Throws:: IntrospectionException - for the usual reasons
See Also:: Introspector.getBeanInfo(Class, Class)

wrapStringToArray

public static String[] wrapStringToArray(String original,
                                         int width,
                                         boolean wrapWords,
                                         boolean removeNewLines)

Deprecated. use wrapStringToArray(String, int, BreakIterator, boolean) since it is better for I18N

Wrap multi-line strings (and get the individual lines).

Parameters:: original - the original string to wrap; width - the maximum width of lines; wrapWords - if true, the lines are wrapped on word boundaries (if possible); if false, character boundaries are used; removeNewLines - if true, any newlines in the original string are ignored
Returns:: the lines after wrapping

wrapStringToArray

public static String[] wrapStringToArray(String original,
                                         int width,
                                         BreakIterator breakIterator,
                                         boolean removeNewLines)

Wrap multi-line strings (and get the individual lines).

Parameters:: original - the original string to wrap; width - the maximum width of lines; breakIterator - breaks original to chars, words, sentences, depending on what instance you provide.; removeNewLines - if true, any newlines in the original string are ignored
Returns:: the lines after wrapping

wrapString

public static String wrapString(String original,
                                int width,
                                BreakIterator breakIterator,
                                boolean removeNewLines)

Wrap multi-line strings.

Parameters:: original - the original string to wrap; width - the maximum width of lines; breakIterator - algorithm for breaking lines; removeNewLines - if true, any newlines in the original string are ignored
Returns:: the whole string with embedded newlines

wrapString

public static String wrapString(String original,
                                int width,
                                boolean wrapWords,
                                boolean removeNewLines)

Deprecated. Use (String, int, BreakIterator, boolean) as it is friendlier to I18N.

Wrap multi-line strings.

Parameters:: original - the original string to wrap; width - the maximum width of lines; wrapWords - if true, the lines are wrapped on word boundaries (if possible); if false, character boundaries are used; removeNewLines - if true, any newlines in the original string are ignored
Returns:: the whole string with embedded newlines

replaceString

public static String replaceString(String original,
                                   String replaceFrom,
                                   String replaceTo)

Search-and-replace fixed string matches within a string.

Parameters:: original - the original string; replaceFrom - the substring to be find; replaceTo - the substring to replace it with
Returns:: a new string with all occurrences replaced

pureClassName

public static final String pureClassName(String fullName)

Turn full name of an inner class into its pure form.

Parameters:: fullName - e.g. some.pkg.SomeClass$Inner
Returns:: e.g. Inner

isLargeFrameIcons

public static final boolean isLargeFrameIcons()

Test whether the operating system supports icons on frames (windows).

Returns:: true if it does not

arrayHashCode

public static int arrayHashCode(Object[] arr)

Compute hash code of array. Asks all elements for their own code and composes the values.

Parameters:: arr - array of objects, can contain nulls
Returns:: the hash code
See Also:: Object.hashCode()

compareObjects

public static boolean compareObjects(Object o1,
                                     Object o2)

Safe equality check. The supplied objects are equal if:

both are null
both are arrays with same length and equal items (if the items are arrays, they are not checked the same way again)
the two objects are Object.equals(java.lang.Object)

This method is null-safe, so if one of the parameters is true and the second not, it returns false.

Parameters:: o1 - the first object to compare; o2 - the second object to compare
Returns:: true if the objects are equal

compareObjectsImpl

public static boolean compareObjectsImpl(Object o1,
                                         Object o2,
                                         int checkArraysDepth)

Safe equality check with array recursion.

Parameters:: o1 - the first object to compare; o2 - the second object to compare; checkArraysDepth - the depth to which arrays should be compared for equality (negative for infinite depth, zero for no comparison of elements, one for shallow, etc.)
Returns:: true if the objects are equal
See Also:: compareObjects(Object, Object)

getClassName

public static String getClassName(Class clazz)

Assemble a human-presentable class name for a specified class. Arrays are represented as e.g. java.lang.String[].

Parameters:: clazz - the class to name
Returns:: the human-presentable name

getShortClassName

public static String getShortClassName(Class clazz)

Assemble a human-presentable class name for a specified class (omitting the package). Arrays are represented as e.g. String[].

Parameters:: clazz - the class to name
Returns:: the human-presentable name

toPrimitiveArray

public static Object toPrimitiveArray(Object[] array)

Convert an array of objects to an array of primitive types. E.g. an Integer[] would be changed to an int[].

Parameters:: array - the wrapper array
Returns:: a primitive array
Throws:: IllegalArgumentException - if the array element type is not a primitive wrapper

toObjectArray

public static Object[] toObjectArray(Object array)

Convert an array of primitive types to an array of objects. E.g. an int[] would be turned into an Integer[].

Parameters:: array - the primitive array
Returns:: a wrapper array
Throws:: IllegalArgumentException - if the array element type is not primitive

getObjectType

public static Class getObjectType(Class c)

Get the object type for given primitive type.

Parameters:: c - primitive type (e.g. int)
Returns:: object type (e.g. Integer)

getPrimitiveType

public static Class getPrimitiveType(Class c)

Get the primitive type for given object type.

Parameters:: c - object type (e.g. Integer)
Returns:: primitive type (e.g. int)

getFocusTraversableComponent

public static Component getFocusTraversableComponent(Component c)

Find a focus-traverable component.

Parameters:: c - the component to look in
Returns:: the same component if traversable, else a child component if present, else null
See Also:: Component.isFocusTraversable()

parseParameters

public static String[] parseParameters(String s)

Parses parameters from a given string in shell-like manner. Users of the Bourne shell (e.g. on Unix) will already be familiar with the behavior. For example, when using org.openide.execution.NbProcessDescriptor (Execution API) you should be able to:

Include command names with embedded spaces, such as c:\Program Files\jdk\bin\javac.
Include extra command arguments, such as -Dname=value.
Do anything else which might require unusual characters or processing. For example:
```
 "c:\program files\jdk\bin\java" -Dmessage="Hello /\\/\\ there!" -Xmx128m
 
```
This example would create the following executable name and arguments:
1. c:\program files\jdk\bin\java
2. -Dmessage=Hello /\/\ there!
3. -Xmx128m
Note that the command string does not escape its backslashes--under the assumption that Windows users will not think to do this, meaningless escapes are just left as backslashes plus following character.

Caveat: even after parsing, Windows programs (such as the Java launcher) may not fully honor certain characters, such as quotes, in command names or arguments. This is because programs under Windows frequently perform their own parsing and unescaping (since the shell cannot be relied on to do this). On Unix, this problem should not occur.

Parameters:: s - a string to parse
Returns:: an array of parameters

escapeParameters

public static String escapeParameters(String[] params)

Complementary method to parseParameters

See Also:: parseParameters(java.lang.String)

keyToString

public static String keyToString(KeyStroke stroke)

Converts a Swing key stroke descriptor to a familiar Emacs-like name.

Parameters:: stroke - key description
Returns:: name of the key (e.g. CS-F1 for control-shift-function key one)
See Also:: stringToKey(java.lang.String)

stringToKey

public static KeyStroke stringToKey(String s)

Construct a new key description from a given universal string description. Provides mapping between Emacs-like textual key descriptions and the KeyStroke object used in Swing.

This format has following form:

[C][A][S][M]-identifier

Where:

C stands for the Control key
A stands for the Alt key
S stands for the Shift key
M stands for the Meta key

The format also supports two wildcard codes, to support differences in platforms. These are the preferred choices for registering keystrokes, since platform conflicts will automatically be handled:

D stands for the default menu accelerator - the Control key on most platforms, the Command (meta) key on Macintosh
O stands for the alternate accelerator - the Alt key on most platforms, the Ctrl key on Macintosh (Macintosh uses Alt as a secondary shift key for composing international characters - if you bind Alt-8 to an action, a mac user with a French keyboard will not be able to type the [ character, which is a significant handicap

If you use the wildcard characters, and specify a key which will conflict with keys the operating system consumes, it will be mapped to whichever choice can work - for example, on Macintosh, Command-Q is always consumed by the operating system, so D-Q will always map to Control-Q.

Every modifier before the hyphen must be pressed. identifier can be any text constant from KeyEvent but without the leading VK_ characters. So KeyEvent.VK_ENTER is described as ENTER.

Parameters:: s - the string with the description of the key
Returns:: key description object, or null if the string does not represent any valid key

stringToKeys

public static KeyStroke[] stringToKeys(String s)

Convert a space-separated list of user-friendly key binding names to a list of Swing key strokes.

Parameters:: s - the string with keys
Returns:: array of key strokes, or null if the string description is not valid
See Also:: stringToKey(java.lang.String)

getUsableScreenBounds

public static Rectangle getUsableScreenBounds()

Returns the usable area of the screen where applications can place its windows. The method subtracts from the screen the area of taskbars, system menus and the like. The screen this method applies to is the one which is considered current, ussually the one where the current input focus is.

Returns:: the rectangle of the screen where one can place windows
Since:: 2.5

getUsableScreenBounds

public static Rectangle getUsableScreenBounds(GraphicsConfiguration gconf)

Returns the usable area of the screen where applications can place its windows. The method subtracts from the screen the area of taskbars, system menus and the like.

Parameters:: gconf - the GraphicsConfiguration of the monitor
Returns:: the rectangle of the screen where one can place windows
Since:: 2.5

findCenterBounds

public static Rectangle findCenterBounds(Dimension componentSize)

Helps client code place components on the center of the screen. It handles multiple monitor configuration correctly

Parameters:: componentSize - the size of the component
Returns:: bounds of the centered component
Since:: 2.5

getScreenSize

public static final Dimension getScreenSize()

Deprecated. this method is almost useless in multiple monitor configuration

Returns:: size of the screen. The size is modified for Windows OS - some pointes are subtracted to reflect a presence of the taskbar
See Also:: getUsableScreenBounds(), findCenterBounds(Dimension)

showJFileChooser

public static final int showJFileChooser(JFileChooser chooser,
                                         Component parent,
                                         String approveButtonText)

Deprecated. Not needed in JDK 1.4.

Utility method for avoiding of memory leak in JDK 1.3 / JFileChooser.showDialog(...)

Parameters:: parent -; approveButtonText -

partialSort

public static List partialSort(List l,
                               Comparator c,
                               boolean stable)
                        throws Utilities.UnorderableException

Deprecated. Deprecated in favor of the potentially much faster (and possibly more correct) topologicalSort(java.util.Collection, java.util.Map).

Sort a list according to a specified partial order. Note that in the current implementation, the comparator will be called exactly once for each distinct pair of list elements, ignoring order, so caching its results is a waste of time.

Parameters:: l - the list to sort (will not be modified); c - a comparator to impose the partial order; "equal" means that the elements are not ordered with respect to one another, i.e. may be only a partial order; stable - whether to attempt a stable sort, meaning that the position of elements will be disturbed as little as possible; might be slightly slower
Returns:: the partially-sorted list
Throws:: Utilities.UnorderableException - if the specified partial order is inconsistent on this list

topologicalSort

public static List topologicalSort(Collection c,
                                   Map edges)
                            throws TopologicalSortException

Topologically sort some objects.

There may not be any nulls among the objects, nor duplicates (as per hash/equals), nor duplicates among the edge lists. The edge map need not contain an entry for every object, only if it has some outgoing edges (empty but not null map values are permitted). The edge map may contain neither keys nor value entries for objects not in the collection to be sorted.

The incoming parameters will not be modified; they must not be changed during the call and possible calls to TopologicalSortException methods. The returned list will support modifications.

There is a weak stability guarantee: if there are no edges which contradict the incoming order, the resulting list will be in the same order as the incoming elements. However if some elements need to be rearranged, it is not guaranteed that others will not also be rearranged, even if they did not strictly speaking need to be.

Parameters:: c - a collection of objects to be topologically sorted; edges - constraints among those objects, of type Map<Object,Collection>; if an object is a key in this map, the resulting order will have that object before any objects listed in the value
Returns:: a partial ordering of the objects in the collection,
Throws:: TopologicalSortException - if the sort cannot succeed due to cycles in the graph, the exception contains additional information to describe and possibly recover from the error
Since:: 3.30
See Also:: Issue #27286

translate

public static String translate(String className)

Provides support for parts of the system that deal with classnames (use Class.forName, NbObjectInputStream, etc.).

Often class names (especially package names) changes during lifecycle of a module. When some piece of the system stores the name of a class in certain point of a time and wants to find the correct Class later it needs to count with the possibility of rename.

For such purposes this method has been created. It allows modules to register their classes that changed names and other parts of system that deal with class names to find the correct names.

To register a mapping from old class names to new ones create a file META-INF/netbeans/translate.names in your module and fill it with your mapping:

 #
 # Mapping of legacy classes to new ones
 #

 org.oldpackage.MyClass=org.newpackage.MyClass # rename of package for one class
 org.mypackage.OldClass=org.mypackage.NewClass # rename of class in a package

 # rename of class and package
 org.oldpackage.OldClass=org.newpackage.NewClass

 # rename of whole package
 org.someoldpackage=org.my.new.package.structure

Btw. one can use spaces instead of = sign. For a real world example check the xml module.

For purposes of org.openide.util.io.NbObjectInputStream there is a following special convention: If the className is not listed as one that is to be renamed, the returned string == className, if the className is registered to be renamed than the className != returned value, even in a case when className.equals (retValue)

Parameters:: className - fully qualified name of a class to translate
Returns:: new name of the class according to renaming rules.

mergeImages

public static final Image mergeImages(Image image1,
                                      Image image2,
                                      int x,
                                      int y)

This method merges two images into the new one. The second image is drawn over the first one with its top-left corner at x, y. Images mustn't be of the same size. New image will have a size of max(second image size + top-left corner, first image size). Method is used mostly when second image contains transparent pixels (e.g. for badging). If both images are null, it makes default transparent 16x16 image.

Parameters:: image1 - underlying image; image2 - second image; x - x position of top-left corner; y - y position of top-left corner
Returns:: new merged image

loadImage

public static final Image loadImage(String resourceID)

Loads an image from the specified resource ID. The image is loaded using the "system" classloader registered in Lookup.

Parameters:: resourceID - resource path of the icon (no initial slash)
Returns:: icon's Image, or null, if the icon cannot be loaded.

actionsToPopup

public static JPopupMenu actionsToPopup(Action[] actions,
                                        Lookup context)

Builds a popup menu from actions for provided context specified by Lookup. Takes list of actions and for actions whic are instances of ContextAwareAction creates and uses the context aware instance. Then gets the action presenter or simple menu item for the action to the popup menu for each action (or separator for each 'lonely' null array member).

Parameters:: actions - array of actions to build menu for. Can contain null elements, they will be replaced by separators; context - the context for which the popup is build
Returns:: the constructed popup menu
Since:: 3.29
See Also:: ContextAwareAction

actionsToPopup

public static JPopupMenu actionsToPopup(Action[] actions,
                                        Component component)

Builds a popup menu for provided component. It retrieves context (lookup) from provided component instance or one of its parent (it searches up to the hierarchy for Lookup.Provider instance). If none of the components is Lookup.Provider instance, then it is created context which is fed with composite ActionMap which delegates to all components up to hierarchy started from the specified one. Then actionsToPopup(Action[], Lookup)} is called with the found Lookup instance, which actually creates a popup menu.

Parameters:: actions - array of actions to build menu for. Can contain null elements, they will be replaced by separators; component - a component in which to search for a context
Returns:: the constructed popup menu
Since:: 3.29
See Also:: Lookup.Provider, actionsToPopup(Action[], Lookup)

actionsGlobalContext

public static Lookup actionsGlobalContext()

Global context for actions. Toolbar, menu or any other "global" action presenters shall operate in this context.

Returns:: the context for actions
Since:: 4.10
See Also:: ContextGlobalProvider

loadImage

public static final Image loadImage(String resource,
                                    boolean localized)

Loads an image based on resource path. Exactly like loadImage(String) but may do a localized search. For example, requesting org/netbeans/modules/foo/resources/foo.gif might actually find org/netbeans/modules/foo/resources/foo_ja.gif or org/netbeans/modules/foo/resources/foo_mybranding.gif.

Since:: 3.24

createProgressCursor

public static final Cursor createProgressCursor(Component component)

Returns a cursor with an arrow and an hourglass (or stop watch) badge, to be used when a component is busy but the UI is still responding to the user. Similar to the predefined Cursor.WAIT_CURSOR, but has an arrow to indicate a still-responsive UI.

Typically you will set the cursor only temporarily:

  // code is running in other then event dispatch thread
  currentComponent.setCursor(Utilities.createProgressCursor(currentComponent));
  try {
      // perform some work in other than event dispatch thread
      // (do not block UI)
  } finally {
      currentComponent.setCursor(null);
  }

This implementation provides one cursor for all Mac systems, one for all Unix systems (regardless of window manager), and one for all other systems including Windows.

Parameters:: component - the non-null component that will use the progress cursor
Returns:: a progress cursor (Unix, Windows or Mac)
Since:: 3.23

createCustomCursor

public static Cursor createCustomCursor(Component component,
                                        Image icon,
                                        String name)

attachInitJob

public static final void attachInitJob(Component comp4Init,
                                       AsyncGUIJob initJob)

Attaches asynchronous init job to given component. AsyncGUIJob.construct() will be called after first paint, when paint event arrives. Later, AsyncGUIJob.finished() will be called according to the rules of the AsyncGUIJob interface. Useful for components that have slower initialization phase, component can benefit from more responsive behaviour during init.

Parameters:: comp4Init - Regular component in its pre-inited state, state in which component will be shown between first paint and init completion.; initJob - Initialization job to be called asynchronously. Job can optionally implement Cancellable interface for proper cancel logic. Cancel method will be called when component stops to be showing during job's progress. See Component.isShowing()
Since:: 3.36

toURL

public static URL toURL(File f)
                 throws MalformedURLException

Deprecated. Use File.toURI() and URI.toURL() instead under JDK 1.4. (File.toURL() is buggy in JDK 1.3 and the bugs are not fixed in JDK 1.4.)

Convert a file to a matching file: URL.

Parameters:: f - a file (absolute only)
Returns:: a URL using the file protocol
Throws:: MalformedURLException - for no good reason
Since:: 3.26
See Also:: toFile(java.net.URL), Issue #29711

toFile

public static File toFile(URL u)

Deprecated. Use URI.URI(String) and File.File(URI) instead under JDK 1.4. (There was no proper equivalent under JDK 1.3.)

Convert a file: URL to a matching file.

You may not use a URL generated from a file on a different platform, as file name conventions may make the result meaningless or even unparsable.

Parameters:: u - a URL with the file protocol
Returns:: an absolute file it points to, or null if the URL does not seem to point to a file at all
Since:: 3.26
See Also:: toURL(java.io.File), Issue #29711

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Utilities (NetBeans Utilities API) - NetBeans API Javadoc 5.5.0

org.openide.util Class Utilities

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activeReferenceQueue

getOperatingSystem

isWindows

isUnix

isJavaIdentifier

getBeanInfo

getBeanInfo

wrapStringToArray

wrapStringToArray

wrapString

wrapString

replaceString

pureClassName

isLargeFrameIcons

arrayHashCode

compareObjects

compareObjectsImpl

getClassName

getShortClassName

toPrimitiveArray

toObjectArray

getObjectType

getPrimitiveType

getFocusTraversableComponent

parseParameters

escapeParameters

keyToString

stringToKey

stringToKeys

getUsableScreenBounds

getUsableScreenBounds

findCenterBounds

getScreenSize

showJFileChooser

partialSort

topologicalSort

translate

mergeImages

loadImage

actionsToPopup

actionsToPopup

actionsGlobalContext

loadImage

createProgressCursor

createCustomCursor

attachInitJob

toURL

toFile

org.openide.util
Class Utilities