com.puppycrawl.tools.checkstyle.api

Class Utils

java.lang.Object

com.puppycrawl.tools.checkstyle.api.Utils

public final class Utils
extends Object

Contains utility methods.

Version:

1.0

Author:

Oliver Burn

Method Summary

Methods

Modifier and Type	Method and Description
static String	baseClassname(String aType)
static void	closeQuietly(Closeable aShutting) Closes the supplied Closeable object ignoring an IOException if it is thrown.
static Pattern	createPattern(String aPattern) Helper method to create a regular expression.
static org.apache.commons.logging.Log	getExceptionLogger() Accessor for shared instance of logger which should be used to log all exceptions occurred during FileSetCheck work (debug() should be used).
static String[]	getLines(String aFileName) Deprecated. consider using FileText instead
static String[]	getLines(String aFileName, String aCharsetName) Deprecated. consider using FileText instead
static Pattern	getPattern(String aPattern) This is a factory method to return an Pattern object for the specified regular expression.
static Pattern	getPattern(String aPattern, int aCompileFlags) This is a factory method to return an Pattern object for the specified regular expression and compile flags.
static String	getStrippedFileName(String aBasedir, String aFileName) Create a stripped down version of a filename.
static int	lengthExpandedTabs(String aString, int aToIdx, int aTabWidth) Returns the length of a String prefix with tabs expanded.
static int	lengthMinusTrailingWhitespace(String aLine) Returns the length of a string ignoring all trailing whitespace.
static boolean	whitespaceBefore(int aIndex, String aLine) Returns whether the specified string contains only whitespace up to the specified index.

Methods inherited from class java.lang.Object

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

Method Detail

getExceptionLogger

public static org.apache.commons.logging.Log getExceptionLogger()

Accessor for shared instance of logger which should be used to log all exceptions occurred during FileSetCheck work (debug() should be used).

Returns:

shared exception logger.

whitespaceBefore

public static boolean whitespaceBefore(int aIndex,
                       String aLine)

Returns whether the specified string contains only whitespace up to the specified index.

Parameters:

aIndex - index to check up to

aLine - the line to check

Returns:

whether there is only whitespace

lengthMinusTrailingWhitespace

public static int lengthMinusTrailingWhitespace(String aLine)

Returns the length of a string ignoring all trailing whitespace. It is a pity that there is not a trim() like method that only removed the trailing whitespace.

Parameters:

aLine - the string to process

Returns:

the length of the string ignoring all trailing whitespace

lengthExpandedTabs

public static int lengthExpandedTabs(String aString,
                     int aToIdx,
                     int aTabWidth)

Returns the length of a String prefix with tabs expanded. Each tab is counted as the number of characters is takes to jump to the next tab stop.

Parameters:

aString - the input String

aToIdx - index in aString (exclusive) where the calculation stops

aTabWidth - the distance between tab stop position.

Returns:

the length of aString.substring(0, aToIdx) with tabs expanded.

getPattern

public static Pattern getPattern(String aPattern)
                          throws PatternSyntaxException

This is a factory method to return an Pattern object for the specified regular expression. It calls getPattern(String, int) with the compile flags defaults to 0.

Parameters:

aPattern - the regular expression pattern

Returns:

an Pattern object for the supplied pattern

Throws:

PatternSyntaxException - an invalid pattern was supplied

getPattern

public static Pattern getPattern(String aPattern,
                 int aCompileFlags)
                          throws PatternSyntaxException

This is a factory method to return an Pattern object for the specified regular expression and compile flags.

This method is not MT safe, but neither are the returned Pattern objects.

Parameters:

aPattern - the regular expression pattern

aCompileFlags - the compilation flags

Returns:

an Pattern object for the supplied pattern

Throws:

PatternSyntaxException - an invalid pattern was supplied

getLines

@Deprecated
public static String[] getLines(String aFileName)
                         throws IOException

Deprecated. consider using FileText instead

Loads the contents of a file in a String array.

Parameters:

aFileName - the name of the file to load

Returns:

the lines in the file

Throws:

IOException - error occurred

getLines

@Deprecated
public static String[] getLines(String aFileName,
                           String aCharsetName)
                         throws IOException

Deprecated. consider using FileText instead

Loads the contents of a file in a String array using the named charset.

Parameters:

aFileName - the name of the file to load

aCharsetName - the name of a supported charset

Returns:

the lines in the file

Throws:

IOException - error occurred

createPattern

public static Pattern createPattern(String aPattern)
                             throws org.apache.commons.beanutils.ConversionException

Helper method to create a regular expression.

Parameters:

aPattern - the pattern to match

Returns:

a created regexp object

Throws:

org.apache.commons.beanutils.ConversionException - if unable to create Pattern object.

baseClassname

public static String baseClassname(String aType)

Parameters:

aType - the fully qualified name. Cannot be null

Returns:

the base class name from a fully qualified name

getStrippedFileName

public static String getStrippedFileName(String aBasedir,
                         String aFileName)

Create a stripped down version of a filename.

Parameters:

aBasedir - the prefix to strip off the original filename

aFileName - the original filename

Returns:

the filename where an initial prefix of basedir is stripped

closeQuietly

public static void closeQuietly(Closeable aShutting)

Closes the supplied Closeable object ignoring an IOException if it is thrown. Honestly, what are you going to do if you cannot close a file.

Parameters:

aShutting - the object to be closed.