com.opensymphony.xwork2.util

## Class WildcardHelper

- java.lang.Object
- - com.opensymphony.xwork2.util.WildcardHelper

- All Implemented Interfaces:
    PatternMatcher<int[]>

      public class WildcardHelper
      extends Object
      implements PatternMatcher<int[]>

  This class is an utility class that perform wilcard-patterns matching and isolation taken from Apache Cocoon.
  Version:
    $Rev$ $Date: 2005-05-07 12:11:38 -0400 (Sat, 07 May 2005) $

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `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

    Constructors
    Constructor and Description
    `WildcardHelper()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `int[]` | `compilePattern(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.
    `boolean` | `isLiteral(String pattern)` Determines if the pattern contains any * characters
    `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(Map<String,String> map, 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, toString, wait, wait, wait`

- - ### Field Detail

    - #### MATCH_FILE

          protected static final int MATCH_FILE

      The int representing '*' in the pattern `int []`.
      See Also:
        Constant Field Values

    - #### MATCH_PATH

          protected static final int MATCH_PATH

      The int representing '**' in the pattern `int []`.
      See Also:
        Constant Field Values

    - #### MATCH_BEGIN

          protected static final int MATCH_BEGIN

      The int representing begin in the pattern `int []`.
      See Also:
        Constant Field Values

    - #### MATCH_THEEND

          protected static final int MATCH_THEEND

      The int representing end in pattern `int []`.
      See Also:
        Constant Field Values

    - #### MATCH_END

          protected static final int MATCH_END

      The int value that terminates the pattern `int []`.
      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### WildcardHelper

          public WildcardHelper()

  - ### Method Detail

    - #### isLiteral

          public boolean isLiteral(String pattern)

      Determines if the pattern contains any * characters
      Specified by:
        `isLiteral` in interface `PatternMatcher<int[]>`
      Parameters:
        `pattern` - The pattern
      Returns:
        True if no wildcards are found

    - #### compilePattern

          public int[] compilePattern(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:

      - The '*' character is converted to MATCH_FILE, meaning that zero or more characters (excluding the path separator '/') are to be matched.
      - The '**' sequence is converted to MATCH_PATH, meaning that zero or more characters (including the path separator '/') are to be matched.
      - The '\' character is used as an escape sequence ('\*' is translated in '*', not in MATCH_FILE). If an exact '\' character is to be matched the source string must contain a '\\'. sequence.

      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.

      Specified by:
        `compilePattern` in interface `PatternMatcher<int[]>`
      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(Map<String,String> map,
                      String data,
                      int[] expr)

      Match a pattern agains a string and isolates wildcard replacement into a `Stack`.
      Specified by:
        `match` in interface `PatternMatcher<int[]>`
      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.

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