org.apache.struts.util
Class WildcardHelper

java.lang.Object
  |
  +--org.apache.struts.util.WildcardHelper

public class WildcardHelper
extends java.lang.Object

This class is an utility class that perform wilcard-patterns matching and isolation taken from Apache Cocoon.

Since:
Struts 1.2
Version:
$Rev: 54929 $ $Date: 2004-10-16 17:38:42 +0100 (Sat, 16 Oct 2004) $

Field Summary
protected static int MATCH_BEGIN
          The int representing begin in the pattern int [].
protected static int MATCH_END
          The int value that terminates the pattern int [].
protected static int MATCH_FILE
          The int representing '*' in the pattern int [].
protected static int MATCH_PATH
          The int representing '**' in the pattern int [].
protected static int MATCH_THEEND
          The int representing end in pattern int [].
 
Constructor Summary
WildcardHelper()
           
 
Method Summary
 int[] compilePattern(java.lang.String data)
          Translate the given String into a int [] representing the pattern matchable by this class.
protected  int indexOfArray(int[] r, int rpos, int rend, char[] d, int dpos)
          Get the offset of a part of an int array within a char array.
protected  int lastIndexOfArray(int[] r, int rpos, int rend, char[] d, int dpos)
          Get the offset of a last occurance of an int array within a char array.
 boolean match(java.util.Map map, java.lang.String data, int[] expr)
          Match a pattern agains a string and isolates wildcard replacement into a Stack.
protected  boolean matchArray(int[] r, int rpos, int rend, char[] d, int dpos)
          Matches elements of array r from rpos to rend with array d, starting from dpos.
 
Methods inherited from class java.lang.Object
, clone, equals, finalize, getClass, hashCode, notify, notifyAll, registerNatives, toString, wait, wait, wait
 

Field Detail

MATCH_FILE

protected static final int MATCH_FILE
The int representing '*' in the pattern int [].

MATCH_PATH

protected static final int MATCH_PATH
The int representing '**' in the pattern int [].

MATCH_BEGIN

protected static final int MATCH_BEGIN
The int representing begin in the pattern int [].

MATCH_THEEND

protected static final int MATCH_THEEND
The int representing end in pattern int [].

MATCH_END

protected static final int MATCH_END
The int value that terminates the pattern int [].
Constructor Detail

WildcardHelper

public WildcardHelper()
Method Detail

compilePattern

public int[] compilePattern(java.lang.String data)
Translate the given String into a int [] representing the pattern matchable by this class.
This function translates a String into an int array converting the special '*' and '\' characters.
Here is how the conversion algorithm works: When more than two '*' characters, not separated by another character, are found their value is considered as '**' (MATCH_PATH).
The array is always terminated by a special value (MATCH_END).
All MATCH* values are less than zero, while normal characters are equal or greater.
Parameters:
data - The string to translate.
Returns:
The encoded string as an int array, terminated by the MATCH_END value (don't consider the array length).
Throws:
NullPointerException - If data is null.

match

public boolean match(java.util.Map map,
                     java.lang.String data,
                     int[] expr)
Match a pattern agains a string and isolates wildcard replacement into a Stack.
Parameters:
map - The map to store matched values
data - The string to match
expr - The compiled wildcard expression
Returns:
True if a match
Throws:
NullPointerException - If any parameters are null

indexOfArray

protected int indexOfArray(int[] r,
                           int rpos,
                           int rend,
                           char[] d,
                           int dpos)
Get the offset of a part of an int array within a char array.
This method return the index in d of the first occurrence after dpos of that part of array specified by r, starting at rpos and terminating at rend.
Parameters:
r - The array containing the data that need to be matched in d.
rpos - The index of the first character in r to look for.
rend - The index of the last character in r to look for plus 1.
d - The array of char that should contain a part of r.
dpos - The starting offset in d for the matching.
Returns:
The offset in d of the part of r matched in d or -1 if that was not found.

lastIndexOfArray

protected int lastIndexOfArray(int[] r,
                               int rpos,
                               int rend,
                               char[] d,
                               int dpos)
Get the offset of a last occurance of an int array within a char array.
This method return the index in d of the last occurrence after dpos of that part of array specified by r, starting at rpos and terminating at rend.
Parameters:
r - The array containing the data that need to be matched in d.
rpos - The index of the first character in r to look for.
rend - The index of the last character in r to look for plus 1.
d - The array of char that should contain a part of r.
dpos - The starting offset in d for the matching.
Returns:
The offset in d of the last part of r matched in d or -1 if that was not found.

matchArray

protected boolean matchArray(int[] r,
                             int rpos,
                             int rend,
                             char[] d,
                             int dpos)
Matches elements of array r from rpos to rend with array d, starting from dpos.
This method return true if elements of array r from rpos to rend equals elements of array d starting from dpos to dpos+(rend-rpos).
Parameters:
r - The array containing the data that need to be matched in d.
rpos - The index of the first character in r to look for.
rend - The index of the last character in r to look for.
d - The array of char that should start from a part of r.
dpos - The starting offset in d for the matching.
Returns:
true if array d starts from portion of array r.


Copyright 2000-2006 - The Apache Software Foundation