com.izforge.izpack.util.file.types.selectors

Class SelectorUtils

java.lang.Object

com.izforge.izpack.util.file.types.selectors.SelectorUtils

public final class SelectorUtils
extends Object

This is a utility class used by selectors and DirectoryScanner. The functionality more properly belongs just to selectors, but unfortunately DirectoryScanner exposed these as protected methods. Thus we have to support any subclasses of DirectoryScanner that may access these methods.

This is a Singleton.

Method Summary

Modifier and Type	Method and Description
static SelectorUtils	getInstance() Retrieves the instance of the Singleton.
static boolean	hasWildcards(String input) Tests if a string contains stars or question marks
static boolean	isOutOfDate(File src, File target, int granularity) Returns dependency information on these two files.
static boolean	isOutOfDate(Resource src, Resource target, int granularity) Returns dependency information on these two resources.
static boolean	match(String pattern, String str) Tests whether or not a string matches against a pattern.
static boolean	match(String pattern, String str, boolean isCaseSensitive) Tests whether or not a string matches against a pattern.
static boolean	matchPath(String pattern, String str) Tests whether or not a given path matches a given pattern.
static boolean	matchPath(String pattern, String str, boolean isCaseSensitive) Tests whether or not a given path matches a given pattern.
static boolean	matchPatternStart(String pattern, String str) Tests whether or not a given path matches the start of a given pattern up to the first "**".
static boolean	matchPatternStart(String pattern, String str, boolean isCaseSensitive) Tests whether or not a given path matches the start of a given pattern up to the first "**".
static String	removeWhitespace(String input) "Flattens" a string by removing all whitespace (space, tab, linefeed, carriage return, and formfeed).
static String	rtrimWildcardTokens(String input) removes from a pattern all tokens to the right containing wildcards
static Vector<String>	tokenizePath(String path) Breaks a path up into a Vector of path elements, tokenizing on File.separator.
static Vector<String>	tokenizePath(String path, String separator) Breaks a path up into a Vector of path elements, tokenizing on

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static SelectorUtils getInstance()

Retrieves the instance of the Singleton.

Returns:

singleton instance

matchPatternStart

public static boolean matchPatternStart(String pattern,
                                        String str)

Tests whether or not a given path matches the start of a given pattern up to the first "**".

This is not a general purpose test and should only be used if you can live with false positives. For example, pattern=**\a and str=b will yield true.

Parameters:

pattern - The pattern to match against. Must not be null.

str - The path to match, as a String. Must not be null.

Returns:

whether or not a given path matches the start of a given pattern up to the first "**".

matchPatternStart

public static boolean matchPatternStart(String pattern,
                                        String str,
                                        boolean isCaseSensitive)

Tests whether or not a given path matches the start of a given pattern up to the first "**".

This is not a general purpose test and should only be used if you can live with false positives. For example, pattern=**\a and str=b will yield true.

Parameters:

pattern - The pattern to match against. Must not be null.

str - The path to match, as a String. Must not be null.

isCaseSensitive - Whether or not matching should be performed case sensitively.

Returns:

whether or not a given path matches the start of a given pattern up to the first "**".

matchPath

public static boolean matchPath(String pattern,
                                String str)

Tests whether or not a given path matches a given pattern.

Parameters:

pattern - The pattern to match against. Must not be null.

str - The path to match, as a String. Must not be null.

Returns:

true if the pattern matches against the string, or false otherwise.

matchPath

public static boolean matchPath(String pattern,
                                String str,
                                boolean isCaseSensitive)

Tests whether or not a given path matches a given pattern.

Parameters:

pattern - The pattern to match against. Must not be null.

str - The path to match, as a String. Must not be null.

isCaseSensitive - Whether or not matching should be performed case sensitively.

Returns:

true if the pattern matches against the string, or false otherwise.

match

public static boolean match(String pattern,
                            String str)

Tests whether or not a string matches against a pattern. The pattern may contain two special characters:
'*' means zero or more characters
'?' means one and only one character

Parameters:

pattern - The pattern to match against. Must not be null.

str - The string which must be matched against the pattern. Must not be null.

Returns:

true if the string matches against the pattern, or false otherwise.

match

public static boolean match(String pattern,
                            String str,
                            boolean isCaseSensitive)

Tests whether or not a string matches against a pattern. The pattern may contain two special characters:
'*' means zero or more characters
'?' means one and only one character

Parameters:

pattern - The pattern to match against. Must not be null.

str - The string which must be matched against the pattern. Must not be null.

isCaseSensitive - Whether or not matching should be performed case sensitively.

Returns:

true if the string matches against the pattern, or false otherwise.

tokenizePath

public static Vector<String> tokenizePath(String path)

Breaks a path up into a Vector of path elements, tokenizing on File.separator.

Parameters:

path - Path to tokenize. Must not be null.

Returns:

a Vector of path elements from the tokenized path

tokenizePath

public static Vector<String> tokenizePath(String path,
                                          String separator)

Breaks a path up into a Vector of path elements, tokenizing on

Parameters:

path - Path to tokenize. Must not be null.

separator - the separator against which to tokenize.

Returns:

a Vector of path elements from the tokenized path

isOutOfDate

public static boolean isOutOfDate(File src,
                                  File target,
                                  int granularity)

Returns dependency information on these two files. If src has been modified later than target, it returns true. If target doesn't exist, it likewise returns true. Otherwise, target is newer than src and is not out of date, thus the method returns false. It also returns false if the src file doesn't even exist, since how could the target then be out of date.

Parameters:

src - the original file

target - the file being compared against

granularity - the amount in seconds of slack we will give in determining out of dateness

Returns:

whether the target is out of date

isOutOfDate

public static boolean isOutOfDate(Resource src,
                                  Resource target,
                                  int granularity)

Returns dependency information on these two resources. If src has been modified later than target, it returns true. If target doesn't exist, it likewise returns true. Otherwise, target is newer than src and is not out of date, thus the method returns false. It also returns false if the src file doesn't even exist, since how could the target then be out of date.

Parameters:

src - the original resource

target - the resource being compared against

granularity - the amount in seconds of slack we will give in determining out of dateness

Returns:

whether the target is out of date

removeWhitespace

public static String removeWhitespace(String input)

"Flattens" a string by removing all whitespace (space, tab, linefeed, carriage return, and formfeed). This uses StringTokenizer and the default set of tokens as documented in the single arguement constructor.

Parameters:

input - a String to remove all whitespace.

Returns:

a String that has had all whitespace removed.

hasWildcards

public static boolean hasWildcards(String input)

Tests if a string contains stars or question marks

Parameters:

input - a String which one wants to test for containing wildcard

Returns:

true if the string contains at least a star or a question mark

rtrimWildcardTokens

public static String rtrimWildcardTokens(String input)

removes from a pattern all tokens to the right containing wildcards

Parameters:

input - the input string

Returns:

the leftmost part of the pattern without wildcards