textutil.java

wiki建站资源 java编写的 很好用

    {
        String val = props.getProperty( key );

        if( val == null ) return defval;

        return isPositive( val );
    }

    /**
     *  Fetches a String property from the set of Properties.  This differs from
     *  Properties.getProperty() in a couple of key respects: First, property value
     *  is trim()med (so no extra whitespace back and front), and well, that's it.
     *  
     *  @param props The Properties to search through
     *  @param key   The property key
     *  @param defval A default value to return, if the property does not exist.
     *  @return The property value.
     *  @since 2.1.151
     */
    public static String getStringProperty( Properties props,
                                            String key,
                                            String defval )
    {
        String val = props.getProperty( key );
        
        if( val == null ) return defval;
        
        return val.trim();
    }
    
    /**
     *  Returns true, if the string "val" denotes a positive string.  Allowed
     *  values are "yes", "on", and "true".  Comparison is case-insignificant.
     *  Null values are safe.
     *
     *  @param val Value to check.
     *  @return True, if val is "true", "on", or "yes"; otherwise false.
     *
     *  @since 2.0.26
     */
    public static boolean isPositive( String val )
    {
        if( val == null ) return false;

        return ( val.equalsIgnoreCase("true") || val.equalsIgnoreCase("on") ||
                 val.equalsIgnoreCase("yes") );
    }

    /**
     *  Makes sure that the POSTed data is conforms to certain rules.  These
     *  rules are:
     *  <UL>
     *  <LI>The data always ends with a newline (some browsers, such
     *      as NS4.x series, does not send a newline at the end, which makes
     *      the diffs a bit strange sometimes.
     *  <LI>The CR/LF/CRLF mess is normalized to plain CRLF.
     *  </UL>
     *
     *  The reason why we're using CRLF is that most browser already
     *  return CRLF since that is the closest thing to a HTTP standard.
     */
    public static String normalizePostData( String postData )
    {
        StringBuffer sb = new StringBuffer();

        for( int i = 0; i < postData.length(); i++ )
        {
            switch( postData.charAt(i) )
            {
              case 0x0a: // LF, UNIX
                sb.append( "\r\n" );
                break;

              case 0x0d: // CR, either Mac or MSDOS
                sb.append( "\r\n" );
                // If it's MSDOS, skip the LF so that we don't add it again.
                if( i < postData.length()-1 && postData.charAt(i+1) == 0x0a )
                {
                    i++;
                }
                break;

              default:
                sb.append( postData.charAt(i) );
                break;
            }
        }

        if( sb.length() < 2 || !sb.substring( sb.length()-2 ).equals("\r\n") )
        {
            sb.append( "\r\n" );
        }

        return sb.toString();
    }

    private static final int EOI   = 0;
    private static final int LOWER = 1;
    private static final int UPPER = 2;
    private static final int DIGIT = 3;
    private static final int OTHER = 4;

    private static int getCharKind(int c)
    {
        if (c==-1)
        {
            return EOI;
        }

        char ch = (char) c;

        if (Character.isLowerCase(ch))
            return LOWER;
        else if (Character.isUpperCase(ch))
            return UPPER;
        else if (Character.isDigit(ch))
            return DIGIT;
        else
            return OTHER;
    }

    /**
     *  Adds spaces in suitable locations of the input string.  This is
     *  used to transform a WikiName into a more readable format.
     *
     *  @param s String to be beautified.
     *  @return A beautified string.
     */
    public static String beautifyString( String s )
    {
        return beautifyString( s, " " );
    }

    /**
     *  Adds spaces in suitable locations of the input string.  This is
     *  used to transform a WikiName into a more readable format.
     *
     *  @param s String to be beautified.
     *  @param space Use this string for the space character.
     *  @return A beautified string.
     *  @since 2.1.127
     */
    public static String beautifyString( String s, String space )
    {
        StringBuffer result = new StringBuffer();

        if( s == null || s.length() == 0 ) return "";

        int cur     = s.charAt(0);
        int curKind = getCharKind(cur);

        int prevKind = LOWER;
        int nextKind = -1;

        int next = -1;
        int nextPos = 1;

        while( curKind != EOI )
        {
            next = (nextPos < s.length()) ? s.charAt(nextPos++) : -1;
            nextKind = getCharKind( next );

            if( (prevKind == UPPER) && (curKind == UPPER) && (nextKind == LOWER) )
            {
                result.append(space);
                result.append((char) cur);
            }
            else
            {
                result.append((char) cur);
                if( ( (curKind == UPPER) && (nextKind == DIGIT) )
                    || ( (curKind == LOWER) && ((nextKind == DIGIT) || (nextKind == UPPER)) )
                    || ( (curKind == DIGIT) && ((nextKind == UPPER) || (nextKind == LOWER)) ))
                {
                    result.append(space);
                }
            }
            prevKind = curKind;
            cur      = next;
            curKind  = nextKind;
        }

        return result.toString();
    }

    /**
     *  Creates a Property object based on an array which contains alternatively
     *  a key and a value.  It is useful for generating default mappings.
     *  For example:
     *  <pre>
     *     String[] properties = { "jspwiki.property1", "value1",
     *                             "jspwiki.property2", "value2 };
     *
     *     Properties props = TextUtil.createPropertes( values );
     *
     *     System.out.println( props.getProperty("jspwiki.property1") );
     *  </pre>
     *  would output "value1".
     *
     *  @param values Alternating key and value pairs.
     *  @return Property object
     *  @see java.util.Property
     *  @throws IllegalArgumentException, if the property array is missing
     *          a value for a key.
     *  @since 2.2.
     */

    public static Properties createProperties( String[] values )
        throws IllegalArgumentException
    {
        if( values.length % 2 != 0 )
            throw new IllegalArgumentException( "One value is missing.");

        Properties props = new Properties();

        for( int i = 0; i < values.length; i += 2 )
        {
            props.setProperty( values[i], values[i+1] );
        }

        return props;
    }

    /**
     *  Counts the number of sections (separated with "----") from the page.
     *
     *  @param pagedata The WikiText to parse.
     *  @return int Number of counted sections.
     *  @since 2.1.86.
     */

    public static int countSections( String pagedata )
    {
        int tags  = 0;
        int start = 0;

        while( (start = pagedata.indexOf("----",start)) != -1 )
        {
            tags++;
            start+=4; // Skip this "----"
        }

        //
        // The first section does not get the "----"
        //
        return pagedata.length() > 0 ? tags+1 : 0;
    }

    /**
     *  Gets the given section (separated with "----") from the page text.
     *  Note that the first section is always #1.  If a page has no section markers,
     *  them there is only a single section, #1.
     *
     *  @param pagedata WikiText to parse.
     *  @param section  Which section to get.
     *  @return String  The section.
     *  @throws IllegalArgumentException If the page does not contain this many sections.
     *  @since 2.1.86.
     */
    public static String getSection( String pagedata, int section )
        throws IllegalArgumentException
    {
        int tags  = 0;
        int start = 0;
        int previous = 0;

        while( (start = pagedata.indexOf("----",start)) != -1 )
        {
            if( ++tags == section )
            {
                return pagedata.substring( previous, start );
            }

            start += 4; // Skip this "----"

            previous = start;
        }

        if( ++tags == section )
        {
            return pagedata.substring( previous );
        }

        throw new IllegalArgumentException("There is no section no. "+section+" on the page.");
    }

    /**
     *  A simple routine which just repeates the arguments.  This is useful
     *  for creating something like a line or something.
     *
     *  @param what String to repeat
     *  @param times How many times to repeat the string.
     *  @return Guess what?
     *  @since 2.1.98.
     */
    public static String repeatString( String what, int times )
    {
        StringBuffer sb = new StringBuffer();

        for( int i = 0; i < times; i++ )
        {
            sb.append( what );
        }

        return sb.toString();
    }
    
    /**
     *  Converts a string from the Unicode representation into something that can be
     *  embedded in a java properties file.  All references outside the ASCII range 
     *  are replaced with \\uXXXX.
     *  
     *  @param s
     *  @return 
     */
    public static String native2Ascii(String s)
    {
        StringBuffer sb = new StringBuffer();
        for(int i = 0; i < s.length(); i++)
        {
            char aChar = s.charAt(i);
            if ((aChar < 0x0020) || (aChar > 0x007e)) 
            {
                sb.append('\\');
                sb.append('u');
                sb.append(toHex((aChar >> 12) & 0xF));
                sb.append(toHex((aChar >>  8) & 0xF));
                sb.append(toHex((aChar >>  4) & 0xF));
                sb.append(toHex( aChar        & 0xF));
            } 
            else 
            {
                sb.append(aChar);
            }
        }
        return sb.toString();
    }
    
    private static char toHex(int nibble) 
    {
        final char[] hexDigit = 
        {
            '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'
        };
        return hexDigit[(nibble & 0xF)];
    }
}