Package org.aspectj.util

Class LangUtil

java.lang.Object

org.aspectj.util.LangUtil

public class LangUtil
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	LangUtil.ProcessController	Handle an external process asynchrously.
static class	LangUtil.StringChecker	check if input contains any packages to elide.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	EOL
static final String	JRT_FS

Constructor Summary

Constructors

Constructor	Description
LangUtil()

Method Summary

Modifier and Type	Method	Description
static List<String>	anySplit(String input, String delim)	Splits input, removing delimiter and trimming any white space.
static <T> List<T>	arrayAsList(T[] array)	Replacement for Arrays.asList(..) which gacks on null and returns a List in which remove is an unsupported operation.
static List<String>	commaSplit(String input)	Splits input at commas, trimming any white space.
static String[][]	copyStrings(String[][] in)	copy non-null two-dimensional String[][]
static String[]	extractOptions(String[] args, String[][] options)	Extract options and arguments to input option list, returning remainder.
static boolean	getBoolean(String propertyName, boolean defaultValue)	Get System property as boolean, but use default value where the system property is not set.
static File	getJavaExecutable()	Find java executable File path from java.home system property.
static String	getJavaHome()
static String	getJrtFsFilePath()
static double	getVmVersion()
static String	getVmVersionString()
static boolean	isEmpty(byte[] ra)
static boolean	isEmpty(Object[] ra)
static boolean	isEmpty(String s)
static boolean	isEmpty(Collection<?> collection)
static boolean	isEmpty(Map<?,?> map)
static boolean	isVMGreaterOrEqual(double javaVersion)
static boolean	isVMGreaterOrEqual(int javaVersion)
static boolean	isVMLessOrEqual(double javaVersion)
static boolean	isVMLessOrEqual(int javaVersion)
static String	makeClasspath(String bootclasspath, String classpath, String classesDir, String outputJar)	Gen classpath.
static LangUtil.ProcessController	makeProcess(LangUtil.ProcessController controller, String classpath, String mainClass, String[] args)	Create or initialize a process controller to run a process in another VM asynchronously.
static String	renderException(Throwable t)	Renders exception t after unwrapping and eliding any test packages.
static String	renderException(Throwable t, boolean elide)	Renders exception t, unwrapping, optionally eliding and limiting total number of lines.
static String	renderExceptionShort(Throwable e)
static String	replace(String in, String sought, String replace)	inefficient way to replace all instances of sought with replace
static Object[]	safeCopy(Object[] source, Object[] sink)	Convert arrays safely.
static <T> List<T>	safeList(List<T> list)
static boolean	sleepUntil(long time)	Sleep until a particular time.
static String[]	split(String text)	Splits text at whitespace.
static String[]	splitClasspath(String classpath)	Split string as classpath, delimited at File.pathSeparator.
static StringBuffer	stackToString(Throwable throwable, boolean skipMessage)	Dump message and stack to StringBuffer.
static List<String>	strings(String text)	Splits strings into a List using a StringTokenizer.
static final void	throwIaxIfFalse(boolean test, String message)	Shorthand for "if false, throw IllegalArgumentException"
static final void	throwIaxIfNotAssignable(Object[] ra, Class<?> c, String name)	Shorthand for "if not null or not assignable, throw IllegalArgumentException"
static final void	throwIaxIfNotAssignable(Object o, Class<?> c, String name)	Shorthand for "if not null or not assignable, throw IllegalArgumentException"
static final void	throwIaxIfNull(Object o, String name)	Shorthand for "if null, throw IllegalArgumentException"
static String	toSizedString(long i, int width)	render i right-justified with a given width less than about 40
static String	unqualifiedClassName(Class<?> c)
static String	unqualifiedClassName(Object o)
static Throwable	unwrapException(Throwable t)

Methods inherited from class java.lang.Object

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

Field Details

EOL

public static final String EOL

JRT_FS

public static final String JRT_FS

See Also:

• Constant Field Values

Constructor Details

LangUtil

public LangUtil()

Method Details

getVmVersionString

public static String getVmVersionString()

Returns:

the vm version (1.1, 1.2, 1.3, 1.4, etc)

getVmVersion

public static double getVmVersion()

isVMGreaterOrEqual

public static boolean isVMGreaterOrEqual(int javaVersion)

isVMGreaterOrEqual

public static boolean isVMGreaterOrEqual(double javaVersion)

isVMLessOrEqual

public static boolean isVMLessOrEqual(int javaVersion)

isVMLessOrEqual

public static boolean isVMLessOrEqual(double javaVersion)

throwIaxIfNull

public static final void throwIaxIfNull(Object o,
 String name)

Shorthand for "if null, throw IllegalArgumentException"

Throws:

IllegalArgumentException - "null {name}" if o is null

throwIaxIfNotAssignable

public static final void throwIaxIfNotAssignable(Object[] ra,
 Class<?> c,
 String name)

Shorthand for "if not null or not assignable, throw IllegalArgumentException"

Parameters:

c - the Class to check - use null to ignore type check

Throws:

IllegalArgumentException - "null {name}" if o is null

throwIaxIfNotAssignable

public static final void throwIaxIfNotAssignable(Object o,
 Class<?> c,
 String name)

Shorthand for "if not null or not assignable, throw IllegalArgumentException"

Throws:

IllegalArgumentException - "null {name}" if o is null

throwIaxIfFalse

public static final void throwIaxIfFalse(boolean test,
 String message)

Shorthand for "if false, throw IllegalArgumentException"

Throws:

IllegalArgumentException - "{message}" if test is false

isEmpty

public static boolean isEmpty(String s)

Returns:

((null == s) || (0 == s.length()));

isEmpty

public static boolean isEmpty(Object[] ra)

Returns:

((null == ra) || (0 == ra.length))

isEmpty

public static boolean isEmpty(byte[] ra)

Returns:

((null == ra) || (0 == ra.length))

isEmpty

public static boolean isEmpty(Collection<?> collection)

Returns:

((null == collection) || (0 == collection.size()))

isEmpty

public static boolean isEmpty(Map<?,?> map)

Returns:

((null == map) || (0 == map.size()))

split

public static String[] split(String text)

Splits text at whitespace.

Parameters:

text - String to split.

commaSplit

public static List<String> commaSplit(String input)

Splits input at commas, trimming any white space.

Parameters:

input - String to split.

Returns:

List of String of elements.

splitClasspath

public static String[] splitClasspath(String classpath)

Split string as classpath, delimited at File.pathSeparator. Entries are not trimmed, but empty entries are ignored.

Parameters:

classpath - the String to split - may be null or empty

Returns:

String[] of classpath entries

getBoolean

public static boolean getBoolean(String propertyName,
 boolean defaultValue)

Get System property as boolean, but use default value where the system property is not set.

Returns:

true if value is set to true, false otherwise

anySplit

public static List<String> anySplit(String input,
 String delim)

Splits input, removing delimiter and trimming any white space. Returns an empty collection if the input is null. If delimiter is null or empty or if the input contains no delimiters, the input itself is returned after trimming white space.

Parameters:

input - String to split.

delim - String separators for input.

Returns:

List of String of elements.

strings

public static List<String> strings(String text)

Splits strings into a List using a StringTokenizer.

Parameters:

text - String to split.

safeList

public static <T> List<T> safeList(List<T> list)

Returns:

a non-null unmodifiable List

copyStrings

public static String[][] copyStrings(String[][] in)

copy non-null two-dimensional String[][]

See Also:

• extractOptions(java.lang.String[],java.lang.String[][])

extractOptions

public static String[] extractOptions(String[] args,
 String[][] options)

Extract options and arguments to input option list, returning remainder. The input options will be nullified if not found. e.g.,

 String[] options = new String[][] { new String[] { "-verbose" }, new String[] { "-classpath", null } };
 String[] args = extractOptions(args, options);
 boolean verbose = null != options[0][0];
 boolean classpath = options[1][1];
 

Parameters:

args - the String[] input options

options - the String[][]options to find in the input args - not null for each String[] component the first subcomponent is the option itself, and there is one String subcomponent for each additional argument.

Returns:

String[] of args remaining after extracting options to extracted

safeCopy

public static Object[] safeCopy(Object[] source,
 Object[] sink)

Convert arrays safely. The number of elements in the result will be 1 smaller for each element that is null or not assignable. This will use sink if it has exactly the right size. The result will always have the same component type as sink.

Returns:

an array with the same component type as sink containing any assignable elements in source (in the same order).

Throws:

IllegalArgumentException - if either is null

unqualifiedClassName

public static String unqualifiedClassName(Class<?> c)

Returns:

a String with the unqualified class name of the class (or "null")

unqualifiedClassName

public static String unqualifiedClassName(Object o)

Returns:

a String with the unqualified class name of the object (or "null")

replace

public static String replace(String in,
 String sought,
 String replace)

inefficient way to replace all instances of sought with replace

toSizedString

public static String toSizedString(long i,
 int width)

render i right-justified with a given width less than about 40

renderExceptionShort

public static String renderExceptionShort(Throwable e)

Returns:

"({UnqualifiedExceptionClass}) {message}"

renderException

public static String renderException(Throwable t)

Renders exception t after unwrapping and eliding any test packages.

Parameters:

t - Throwable to print.

See Also:

• LangUtil.StringChecker.TEST_PACKAGES

renderException

public static String renderException(Throwable t,
 boolean elide)

Renders exception t, unwrapping, optionally eliding and limiting total number of lines.

Parameters:

t - Throwable to print.

elide - true to limit to 100 lines and elide test packages

See Also:

• LangUtil.StringChecker.TEST_PACKAGES

stackToString

public static StringBuffer stackToString(Throwable throwable,
 boolean skipMessage)

Dump message and stack to StringBuffer.

unwrapException

public static Throwable unwrapException(Throwable t)

Returns:

Throwable input or tail of any wrapped exception chain

arrayAsList

public static <T> List<T> arrayAsList(T[] array)

Replacement for Arrays.asList(..) which gacks on null and returns a List in which remove is an unsupported operation.

Parameters:

array - the Object[] to convert (may be null)

Returns:

the List corresponding to array (never null)

makeClasspath

public static String makeClasspath(String bootclasspath,
 String classpath,
 String classesDir,
 String outputJar)

Gen classpath.

Parameters:

bootclasspath -

classpath -

classesDir -

outputJar -

Returns:

String combining classpath elements

makeProcess

public static LangUtil.ProcessController makeProcess(LangUtil.ProcessController controller,
 String classpath,
 String mainClass,
 String[] args)

Create or initialize a process controller to run a process in another VM asynchronously.

Parameters:

controller - the ProcessController to initialize, if not null

classpath -

mainClass -

args -

Returns:

initialized ProcessController

getJavaExecutable

public static File getJavaExecutable()

Find java executable File path from java.home system property.

Returns:

File associated with the java command, or null if not found.

sleepUntil

public static boolean sleepUntil(long time)

Sleep until a particular time.

Parameters:

time - the long time in milliseconds to sleep until

Returns:

true if delay succeeded, false if interrupted 100 times

getJrtFsFilePath

public static String getJrtFsFilePath()

getJavaHome

public static String getJavaHome()