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/*
 * The Apache Software License, Version 1.1
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 * modification, are permitted provided that the following conditions
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 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.codehaus.org/)."
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 * ====================================================================
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 * This software consists of voluntary contributions made by many
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 * .
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package org.codehaus.plexus.util;

import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;

/**
 * 

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.

* * @author Arnout J. Kuiper [email protected] * @author Magesh Umasankar * @author Bruce Atherton * * @since 1.5 */ public final class SelectorUtils { public static final String PATTERN_HANDLER_PREFIX = "["; public static final String PATTERN_HANDLER_SUFFIX = "]"; public static final String REGEX_HANDLER_PREFIX = "%regex" + PATTERN_HANDLER_PREFIX; public static final String ANT_HANDLER_PREFIX = "%ant" + PATTERN_HANDLER_PREFIX; private static SelectorUtils instance = new SelectorUtils(); /** * Private Constructor */ private SelectorUtils() { } /** * @return Retrieves the manager of the Singleton. */ public static SelectorUtils getInstance() { return instance; } /** *

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.

* * @param pattern The pattern to match against. Must not be null. * @param str The path to match, as a String. Must not be null. * @return whether or not a given path matches the start of a given pattern up to the first "**". */ public static boolean matchPatternStart( String pattern, String str ) { return matchPatternStart( pattern, str, true ); } /** *

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.

* * @param pattern The pattern to match against. Must not be null. * @param str The path to match, as a String. Must not be null. * @param isCaseSensitive Whether or not matching should be performed case sensitively. * @return whether or not a given path matches the start of a given pattern up to the first "**". */ public static boolean matchPatternStart( String pattern, String str, boolean isCaseSensitive ) { if ( isRegexPrefixedPattern( pattern ) ) { // FIXME: ICK! But we can't do partial matches for regex, so we have to reserve judgement until we have // a file to deal with, or we can definitely say this is an exclusion... return true; } else { if ( isAntPrefixedPattern( pattern ) ) { pattern = pattern.substring( ANT_HANDLER_PREFIX.length(), pattern.length() - PATTERN_HANDLER_SUFFIX.length() ); } String altStr = str.replace( '\\', '/' ); return matchAntPathPatternStart( pattern, str, File.separator, isCaseSensitive ) || matchAntPathPatternStart( pattern, altStr, "/", isCaseSensitive ); } } static boolean isAntPrefixedPattern( String pattern ) { return pattern.length() > ( ANT_HANDLER_PREFIX.length() + PATTERN_HANDLER_SUFFIX.length() + 1 ) && pattern.startsWith( ANT_HANDLER_PREFIX ) && pattern.endsWith( PATTERN_HANDLER_SUFFIX ); } @SuppressWarnings( "SimplifiableIfStatement" ) static boolean matchAntPathPatternStart( MatchPattern pattern, String str, String separator, boolean isCaseSensitive ) { if ( separatorPatternStartSlashMismatch( pattern, str, separator ) ) { return false; } return matchAntPathPatternStart( pattern.getTokenizedPathString(), str, separator, isCaseSensitive ); } static boolean matchAntPathPatternStart( String pattern, String str, String separator, boolean isCaseSensitive ) { // When str starts with a File.separator, pattern has to start with a // File.separator. // When pattern starts with a File.separator, str has to start with a // File.separator. if ( separatorPatternStartSlashMismatch( pattern, str, separator ) ) { return false; } String[] patDirs = tokenizePathToString( pattern, separator ); return matchAntPathPatternStart( patDirs, str, separator, isCaseSensitive ); } // When str starts with a File.separator, pattern has to start with a // File.separator. // When pattern starts with a File.separator, str has to start with a // File.separator. private static boolean separatorPatternStartSlashMismatch( String pattern, String str, String separator ) { return str.startsWith( separator ) != pattern.startsWith( separator ); } private static boolean separatorPatternStartSlashMismatch( MatchPattern matchPattern, String str, String separator ) { return str.startsWith( separator ) != matchPattern.startsWith( separator ); } static boolean matchAntPathPatternStart( String[] patDirs, String str, String separator, boolean isCaseSensitive ) { String[] strDirs = tokenizePathToString( str, separator ); int patIdxStart = 0; int patIdxEnd = patDirs.length - 1; int strIdxStart = 0; int strIdxEnd = strDirs.length - 1; // up to first '**' while ( patIdxStart <= patIdxEnd && strIdxStart <= strIdxEnd ) { String patDir = patDirs[patIdxStart]; if ( patDir.equals( "**" ) ) { break; } if ( !match( patDir, strDirs[strIdxStart], isCaseSensitive ) ) { return false; } patIdxStart++; strIdxStart++; } return strIdxStart > strIdxEnd || patIdxStart <= patIdxEnd; } /** * Tests whether or not a given path matches a given pattern. * * @param pattern The pattern to match against. Must not be null. * @param str The path to match, as a String. Must not be null. * @return true if the pattern matches against the string, or false otherwise. */ public static boolean matchPath( String pattern, String str ) { return matchPath( pattern, str, true ); } /** * Tests whether or not a given path matches a given pattern. * * @param pattern The pattern to match against. Must not be null. * @param str The path to match, as a String. Must not be null. * @param isCaseSensitive Whether or not matching should be performed case sensitively. * @return true if the pattern matches against the string, or false otherwise. */ public static boolean matchPath( String pattern, String str, boolean isCaseSensitive ) { return matchPath( pattern, str, File.separator, isCaseSensitive ); } public static boolean matchPath( String pattern, String str, String separator, boolean isCaseSensitive ) { if ( isRegexPrefixedPattern( pattern ) ) { String localPattern = pattern.substring( REGEX_HANDLER_PREFIX.length(), pattern.length() - PATTERN_HANDLER_SUFFIX.length() ); return str.matches( localPattern ); } else { String localPattern = isAntPrefixedPattern( pattern ) ? pattern.substring( ANT_HANDLER_PREFIX.length(), pattern.length() - PATTERN_HANDLER_SUFFIX.length() ) : pattern; final String osRelatedPath = toOSRelatedPath( str, separator ); final String osRelatedPattern = toOSRelatedPath( localPattern, separator ); return matchAntPathPattern( osRelatedPattern, osRelatedPath, separator, isCaseSensitive ); } } private static String toOSRelatedPath( String pattern, String separator ) { if ( "/".equals( separator ) ) { return pattern.replace( "\\", separator ); } if ( "\\".equals( separator ) ) { return pattern.replace( "/", separator ); } return pattern; } static boolean isRegexPrefixedPattern( String pattern ) { return pattern.length() > ( REGEX_HANDLER_PREFIX.length() + PATTERN_HANDLER_SUFFIX.length() + 1 ) && pattern.startsWith( REGEX_HANDLER_PREFIX ) && pattern.endsWith( PATTERN_HANDLER_SUFFIX ); } static boolean matchAntPathPattern( MatchPattern matchPattern, String str, String separator, boolean isCaseSensitive ) { if ( separatorPatternStartSlashMismatch( matchPattern, str, separator ) ) { return false; } String[] patDirs = matchPattern.getTokenizedPathString(); String[] strDirs = tokenizePathToString( str, separator ); return matchAntPathPattern( patDirs, strDirs, isCaseSensitive ); } static boolean matchAntPathPattern( String pattern, String str, String separator, boolean isCaseSensitive ) { if ( separatorPatternStartSlashMismatch( pattern, str, separator ) ) { return false; } String[] patDirs = tokenizePathToString( pattern, separator ); String[] strDirs = tokenizePathToString( str, separator ); return matchAntPathPattern( patDirs, strDirs, isCaseSensitive ); } static boolean matchAntPathPattern( String[] patDirs, String[] strDirs, boolean isCaseSensitive ) { int patIdxStart = 0; int patIdxEnd = patDirs.length - 1; int strIdxStart = 0; int strIdxEnd = strDirs.length - 1; // up to first '**' while ( patIdxStart <= patIdxEnd && strIdxStart <= strIdxEnd ) { String patDir = patDirs[patIdxStart]; if ( patDir.equals( "**" ) ) { break; } if ( !match( patDir, strDirs[strIdxStart], isCaseSensitive ) ) { return false; } patIdxStart++; strIdxStart++; } if ( strIdxStart > strIdxEnd ) { // String is exhausted for ( int i = patIdxStart; i <= patIdxEnd; i++ ) { if ( !patDirs[i].equals( "**" ) ) { return false; } } return true; } else { if ( patIdxStart > patIdxEnd ) { // String not exhausted, but pattern is. Failure. return false; } } // up to last '**' while ( patIdxStart <= patIdxEnd && strIdxStart <= strIdxEnd ) { String patDir = patDirs[patIdxEnd]; if ( patDir.equals( "**" ) ) { break; } if ( !match( patDir, strDirs[strIdxEnd], isCaseSensitive ) ) { return false; } patIdxEnd--; strIdxEnd--; } if ( strIdxStart > strIdxEnd ) { // String is exhausted for ( int i = patIdxStart; i <= patIdxEnd; i++ ) { if ( !patDirs[i].equals( "**" ) ) { return false; } } return true; } while ( patIdxStart != patIdxEnd && strIdxStart <= strIdxEnd ) { int patIdxTmp = -1; for ( int i = patIdxStart + 1; i <= patIdxEnd; i++ ) { if ( patDirs[i].equals( "**" ) ) { patIdxTmp = i; break; } } if ( patIdxTmp == patIdxStart + 1 ) { // '**/**' situation, so skip one patIdxStart++; continue; } // Find the pattern between padIdxStart & padIdxTmp in str between // strIdxStart & strIdxEnd int patLength = ( patIdxTmp - patIdxStart - 1 ); int strLength = ( strIdxEnd - strIdxStart + 1 ); int foundIdx = -1; strLoop: for ( int i = 0; i <= strLength - patLength; i++ ) { for ( int j = 0; j < patLength; j++ ) { String subPat = patDirs[patIdxStart + j + 1]; String subStr = strDirs[strIdxStart + i + j]; if ( !match( subPat, subStr, isCaseSensitive ) ) { continue strLoop; } } foundIdx = strIdxStart + i; break; } if ( foundIdx == -1 ) { return false; } patIdxStart = patIdxTmp; strIdxStart = foundIdx + patLength; } for ( int i = patIdxStart; i <= patIdxEnd; i++ ) { if ( !patDirs[i].equals( "**" ) ) { return false; } } return true; } static boolean matchAntPathPattern( char[][] patDirs, char[][] strDirs, boolean isCaseSensitive ) { int patIdxStart = 0; int patIdxEnd = patDirs.length - 1; int strIdxStart = 0; int strIdxEnd = strDirs.length - 1; // up to first '**' while ( patIdxStart <= patIdxEnd && strIdxStart <= strIdxEnd ) { char[] patDir = patDirs[patIdxStart]; if ( isDoubleStar( patDir ) ) { break; } if ( !match( patDir, strDirs[strIdxStart], isCaseSensitive ) ) { return false; } patIdxStart++; strIdxStart++; } if ( strIdxStart > strIdxEnd ) { // String is exhausted for ( int i = patIdxStart; i <= patIdxEnd; i++ ) { if ( !isDoubleStar( patDirs[i] ) ) { return false; } } return true; } else { if ( patIdxStart > patIdxEnd ) { // String not exhausted, but pattern is. Failure. return false; } } // up to last '**' while ( patIdxStart <= patIdxEnd && strIdxStart <= strIdxEnd ) { char[] patDir = patDirs[patIdxEnd]; if ( isDoubleStar( patDir ) ) { break; } if ( !match( patDir, strDirs[strIdxEnd], isCaseSensitive ) ) { return false; } patIdxEnd--; strIdxEnd--; } if ( strIdxStart > strIdxEnd ) { // String is exhausted for ( int i = patIdxStart; i <= patIdxEnd; i++ ) { if ( !isDoubleStar( patDirs[i] ) ) { return false; } } return true; } while ( patIdxStart != patIdxEnd && strIdxStart <= strIdxEnd ) { int patIdxTmp = -1; for ( int i = patIdxStart + 1; i <= patIdxEnd; i++ ) { if ( isDoubleStar( patDirs[i] ) ) { patIdxTmp = i; break; } } if ( patIdxTmp == patIdxStart + 1 ) { // '**/**' situation, so skip one patIdxStart++; continue; } // Find the pattern between padIdxStart & padIdxTmp in str between // strIdxStart & strIdxEnd int patLength = ( patIdxTmp - patIdxStart - 1 ); int strLength = ( strIdxEnd - strIdxStart + 1 ); int foundIdx = -1; strLoop: for ( int i = 0; i <= strLength - patLength; i++ ) { for ( int j = 0; j < patLength; j++ ) { char[] subPat = patDirs[patIdxStart + j + 1]; char[] subStr = strDirs[strIdxStart + i + j]; if ( !match( subPat, subStr, isCaseSensitive ) ) { continue strLoop; } } foundIdx = strIdxStart + i; break; } if ( foundIdx == -1 ) { return false; } patIdxStart = patIdxTmp; strIdxStart = foundIdx + patLength; } for ( int i = patIdxStart; i <= patIdxEnd; i++ ) { if ( !isDoubleStar( patDirs[i] ) ) { return false; } } return true; } private static boolean isDoubleStar( char[] patDir ) { return patDir != null && patDir.length == 2 && patDir[0] == '*' && patDir[1] == '*'; } /** * 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 * * @param pattern The pattern to match against. Must not be null. * @param str The string which must be matched against the pattern. Must not be null. * @return true if the string matches against the pattern, or false otherwise. */ public static boolean match( String pattern, String str ) { return match( pattern, str, true ); } /** * 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 * * @param pattern The pattern to match against. Must not be null. * @param str The string which must be matched against the pattern. Must not be null. * @param isCaseSensitive Whether or not matching should be performed case sensitively. * @return true if the string matches against the pattern, or false otherwise. */ public static boolean match( String pattern, String str, boolean isCaseSensitive ) { char[] patArr = pattern.toCharArray(); char[] strArr = str.toCharArray(); return match( patArr, strArr, isCaseSensitive ); } public static boolean match( char[] patArr, char[] strArr, boolean isCaseSensitive ) { int patIdxStart = 0; int patIdxEnd = patArr.length - 1; int strIdxStart = 0; int strIdxEnd = strArr.length - 1; char ch; boolean containsStar = false; for ( char aPatArr : patArr ) { if ( aPatArr == '*' ) { containsStar = true; break; } } if ( !containsStar ) { // No '*'s, so we make a shortcut if ( patIdxEnd != strIdxEnd ) { return false; // Pattern and string do not have the same size } for ( int i = 0; i <= patIdxEnd; i++ ) { ch = patArr[i]; if ( ch != '?' && !equals( ch, strArr[i], isCaseSensitive ) ) { return false; // Character mismatch } } return true; // String matches against pattern } if ( patIdxEnd == 0 ) { return true; // Pattern contains only '*', which matches anything } // Process characters before first star while ( ( ch = patArr[patIdxStart] ) != '*' && strIdxStart <= strIdxEnd ) { if ( ch != '?' && !equals( ch, strArr[strIdxStart], isCaseSensitive ) ) { return false; // Character mismatch } patIdxStart++; strIdxStart++; } if ( strIdxStart > strIdxEnd ) { // All characters in the string are used. Check if only '*'s are // left in the pattern. If so, we succeeded. Otherwise failure. for ( int i = patIdxStart; i <= patIdxEnd; i++ ) { if ( patArr[i] != '*' ) { return false; } } return true; } // Process characters after last star while ( ( ch = patArr[patIdxEnd] ) != '*' && strIdxStart <= strIdxEnd ) { if ( ch != '?' && !equals( ch, strArr[strIdxEnd], isCaseSensitive ) ) { return false; // Character mismatch } patIdxEnd--; strIdxEnd--; } if ( strIdxStart > strIdxEnd ) { // All characters in the string are used. Check if only '*'s are // left in the pattern. If so, we succeeded. Otherwise failure. for ( int i = patIdxStart; i <= patIdxEnd; i++ ) { if ( patArr[i] != '*' ) { return false; } } return true; } // process pattern between stars. padIdxStart and patIdxEnd point // always to a '*'. while ( patIdxStart != patIdxEnd && strIdxStart <= strIdxEnd ) { int patIdxTmp = -1; for ( int i = patIdxStart + 1; i <= patIdxEnd; i++ ) { if ( patArr[i] == '*' ) { patIdxTmp = i; break; } } if ( patIdxTmp == patIdxStart + 1 ) { // Two stars next to each other, skip the first one. patIdxStart++; continue; } // Find the pattern between padIdxStart & padIdxTmp in str between // strIdxStart & strIdxEnd int patLength = ( patIdxTmp - patIdxStart - 1 ); int strLength = ( strIdxEnd - strIdxStart + 1 ); int foundIdx = -1; strLoop: for ( int i = 0; i <= strLength - patLength; i++ ) { for ( int j = 0; j < patLength; j++ ) { ch = patArr[patIdxStart + j + 1]; if ( ch != '?' && !equals( ch, strArr[strIdxStart + i + j], isCaseSensitive ) ) { continue strLoop; } } foundIdx = strIdxStart + i; break; } if ( foundIdx == -1 ) { return false; } patIdxStart = patIdxTmp; strIdxStart = foundIdx + patLength; } // All characters in the string are used. Check if only '*'s are left // in the pattern. If so, we succeeded. Otherwise failure. for ( int i = patIdxStart; i <= patIdxEnd; i++ ) { if ( patArr[i] != '*' ) { return false; } } return true; } /** * Tests whether two characters are equal. */ private static boolean equals( char c1, char c2, boolean isCaseSensitive ) { if ( c1 == c2 ) { return true; } if ( !isCaseSensitive ) { // NOTE: Try both upper case and lower case as done by String.equalsIgnoreCase() if ( Character.toUpperCase( c1 ) == Character.toUpperCase( c2 ) || Character.toLowerCase( c1 ) == Character.toLowerCase( c2 ) ) { return true; } } return false; } private static String[] tokenizePathToString( String path, String separator ) { List ret = new ArrayList(); StringTokenizer st = new StringTokenizer( path, separator ); while ( st.hasMoreTokens() ) { ret.add( st.nextToken() ); } return ret.toArray( new String[0] ); } /** * 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. * * @param src the original file * @param target the file being compared against * @param granularity the amount in seconds of slack we will give in determining out of dateness * @return whether the target is out of date */ public static boolean isOutOfDate( File src, File target, int granularity ) { if ( !src.exists() ) { return false; } if ( !target.exists() ) { return true; } if ( ( src.lastModified() - granularity ) > target.lastModified() ) { return true; } return false; } /** * "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 argument constructor. * * @param input a String to remove all whitespace. * @return a String that has had all whitespace removed. */ public static String removeWhitespace( String input ) { StringBuilder result = new StringBuilder(); if ( input != null ) { StringTokenizer st = new StringTokenizer( input ); while ( st.hasMoreTokens() ) { result.append( st.nextToken() ); } } return result.toString(); } }




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