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/* Copyright (C) 2003 Vladimir Roubtsov. All rights reserved.
*
* This program and the accompanying materials are made available under
* the terms of the Common Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/cpl-v10.html
*
* $Id: WCMatcher.java,v 1.1.1.1 2004/05/09 16:57:56 vlad_r Exp $
*/
package com.vladium.util;
// ----------------------------------------------------------------------------
/**
* @author Vlad Roubtsov, (C) 2002
*/
public
abstract class WCMatcher
{
// public: ................................................................
public static WCMatcher compile (final String pattern)
{
if (pattern == null) throw new IllegalArgumentException ("null input: pattern");
final char [] chars = pattern.toCharArray (); // is this faster than using charAt()?
final int charsLength = chars.length;
if (charsLength == 0)
return EMPTY_MATCHER; // TODO: should be an EMPTY_MATCHER
else
{
int patternLength = 0, starCount = 0, questionCount = 0;
boolean star = false;
for (int c = 0; c < charsLength; ++ c)
{
final char ch = chars [c];
if (ch == '*')
{
if (! star)
{
star = true;
++ starCount;
chars [patternLength ++] = '*';
}
}
else
{
star = false;
if (ch == '?') ++ questionCount;
chars [patternLength ++] = ch;
}
}
// [assertion: patternLength > 0]
if ((starCount == 1) && (questionCount == 0))
{
if (patternLength == 1)
return ALL_MATCHER;
else if (chars [0] == '*')
return new EndsWithMatcher (chars, patternLength);
else if (chars [patternLength - 1] == '*')
return new StartsWithMatcher (chars, patternLength);
}
return new PatternMatcher (chars, patternLength);
}
}
public abstract boolean matches (String s);
public abstract boolean matches (char [] chars);
// private boolean matches (int pi, int si, final char [] string)
// {
// System.out.println ("pi = " + pi + ", si = " + si);
//
// if (pi == m_pattern.length)
// return si == string.length;
// else
// {
// switch (m_pattern [pi])
// {
// case '?':
// {
// return (si < string.length) && matches (pi + 1, si + 1, string);
// }
//
// case '*':
// {
// return matches (pi + 1, si, string) || ((si < string.length) && matches (pi, si + 1, string));
// }
//
// default:
// {
// return (si < string.length) && (m_pattern [pi] == string [si]) && matches (pi + 1, si + 1, string);
// }
//
// } // end of switch
// }
// }
// protected: .............................................................
// package: ...............................................................
WCMatcher () {}
// private: ...............................................................
private static final class AllMatcher extends WCMatcher
{
public final boolean matches (final String s)
{
if (s == null) throw new IllegalArgumentException ("null input: s");
return true;
}
public final boolean matches (final char [] chars)
{
if (chars == null) throw new IllegalArgumentException ("null input: chars");
return true;
}
} // end of nested class
private static final class EmptyMatcher extends WCMatcher
{
public final boolean matches (final String s)
{
if (s == null) throw new IllegalArgumentException ("null input: s");
return false;
}
public final boolean matches (final char [] chars)
{
if (chars == null) throw new IllegalArgumentException ("null input: chars");
return chars.length == 0;
}
} // end of nested class
private static final class StartsWithMatcher extends WCMatcher
{
public final boolean matches (final String s)
{
if (s == null) throw new IllegalArgumentException ("null input: s");
return s.startsWith (m_prefix);
}
public final boolean matches (final char [] chars)
{
if (chars == null) throw new IllegalArgumentException ("null input: chars");
final char [] prefixChars = m_prefixChars;
final int prefixLength = prefixChars.length - 1;
if (chars.length < prefixLength) return false;
for (int c = 0; c < prefixLength; ++ c)
{
if (chars [c] != prefixChars [c]) return false;
}
return true;
}
StartsWithMatcher (final char [] pattern, final int patternLength)
{
m_prefixChars = pattern;
m_prefix = new String (pattern, 0, patternLength - 1);
}
private final char [] m_prefixChars;
private final String m_prefix;
} // end of nested class
private static final class EndsWithMatcher extends WCMatcher
{
public final boolean matches (final String s)
{
if (s == null) throw new IllegalArgumentException ("null input: s");
return s.endsWith (m_suffix);
}
public final boolean matches (final char [] chars)
{
if (chars == null) throw new IllegalArgumentException ("null input: chars");
final char [] suffixChars = m_suffixChars;
final int suffixLength = suffixChars.length - 1;
final int charsLength = chars.length;
if (charsLength < suffixLength) return false;
for (int c = 0; c < suffixLength; ++ c)
{
if (chars [charsLength - 1 - c] != suffixChars [suffixLength - c]) return false;
}
return true;
}
EndsWithMatcher (final char [] pattern, final int patternLength)
{
m_suffixChars = pattern;
m_suffix = new String (pattern, 1, patternLength - 1);
}
private final char [] m_suffixChars;
private final String m_suffix;
} // end of nested class
private static final class PatternMatcher extends WCMatcher
{
public final boolean matches (final String s)
{
if (s == null) throw new IllegalArgumentException ("null input: s");
final char [] string = s.toCharArray (); // implies an array copy; is this faster than using charAt()?
final int stringLength = string.length;
final char [] pattern = m_pattern;
final int patternLength = m_patternLength;
// [assertion: patternLength > 0]
int si = 0, pi = 0;
boolean star = false;
next: while (true)
{
//System.out.println ("pi = " + pi + ", si = " + si);
int i = 0;
for ( ; pi + i < patternLength; ++ i)
{
final char patternChar = pattern [pi + i];
if (patternChar == '*')
{
si += i;
pi += (i + 1);
star = true;
continue next;
}
final int si_i = si + i;
if (si_i == stringLength) return false;
if (patternChar != string [si_i])
{
if (patternChar == '?') continue;
if (! star) return false;
++ si;
continue next;
}
} // end of for
if (si + i == stringLength) return true;
if (! star) return false;
++ si;
// [continue next;]
}
}
public final boolean matches (final char [] string)
{
if (string == null) throw new IllegalArgumentException ("null input: string");
final int stringLength = string.length;
final char [] pattern = m_pattern;
final int patternLength = m_patternLength;
// [assertion: patternLength > 0]
int si = 0, pi = 0;
boolean star = false;
next: while (true)
{
//System.out.println ("pi = " + pi + ", si = " + si);
int i = 0;
for ( ; pi + i < patternLength; ++ i)
{
final char patternChar = pattern [pi + i];
if (patternChar == '*')
{
si += i;
pi += (i + 1);
star = true;
continue next;
}
final int si_i = si + i;
if (si_i == stringLength) return false;
if (patternChar != string [si_i])
{
if (patternChar == '?') continue;
if (! star) return false;
++ si;
continue next;
}
} // end of for
if (si + i == stringLength) return true;
if (! star) return false;
++ si;
// [continue next;]
}
}
PatternMatcher (final char [] pattern, final int patternLength)
{
m_pattern = pattern;
m_patternLength = patternLength;
}
private final char [] m_pattern;
private final int m_patternLength;
} // end of nested class
private static final WCMatcher ALL_MATCHER = new AllMatcher ();
private static final WCMatcher EMPTY_MATCHER = new EmptyMatcher ();
} // end of class
// ----------------------------------------------------------------------------
|
