java.text.CharacterIterator#first ( )源码实例Demo

/**
 * Calculate break positions eagerly parallel to reading text.
 */
public void setText(CharacterIterator ci) {
    int begin = ci.getBeginIndex();
    text = new char[ci.getEndIndex() - begin];
    int[] breaks0 = new int[text.length + 1];
    int brIx = 0;
    breaks0[brIx++] = begin;

    int charIx = 0;
    boolean inWs = false;
    for (char c = ci.first(); c != CharacterIterator.DONE; c = ci.next()) {
        text[charIx] = c;
        boolean ws = Character.isWhitespace(c);
        if (inWs && !ws) {
            breaks0[brIx++] = charIx + begin;
        }
        inWs = ws;
        charIx++;
    }
    if (text.length > 0) {
        breaks0[brIx++] = text.length + begin;
    }
    System.arraycopy(breaks0, 0, breaks = new int[brIx], 0, brIx);
}
 

/**
 * Decodes an Uri with % characters.
 *
 * @param uri String with the uri possibly containing % characters.
 * @return The decoded Uri
 */
private static String decodeUri(String uri) {
    if (uri.indexOf('%') == -1) {
        return uri;
    }
    StringBuffer sb = new StringBuffer();
    CharacterIterator iter = new StringCharacterIterator(uri);
    for (char c = iter.first(); c != CharacterIterator.DONE; c = iter.next()) {
        if (c == '%') {
            char c1 = iter.next();
            if (c1 != CharacterIterator.DONE) {
                int i1 = Character.digit(c1, 16);
                char c2 = iter.next();
                if (c2 != CharacterIterator.DONE) {
                    int i2 = Character.digit(c2, 16);
                    sb.append((char) ((i1 << 4) + i2));
                }
            }
        } else {
            sb.append(c);
        }
    }
    String path = sb.toString();
    return path;
}
 

/**
 * Calculate break positions eagerly parallel to reading text.
 */
public void setText(CharacterIterator ci) {
    int begin = ci.getBeginIndex();
    text = new char[ci.getEndIndex() - begin];
    int[] breaks0 = new int[text.length + 1];
    int brIx = 0;
    breaks0[brIx++] = begin;

    int charIx = 0;
    boolean inWs = false;
    for (char c = ci.first(); c != CharacterIterator.DONE; c = ci.next()) {
        text[charIx] = c;
        boolean ws = Character.isWhitespace(c);
        if (inWs && !ws) {
            breaks0[brIx++] = charIx + begin;
        }
        inWs = ws;
        charIx++;
    }
    if (text.length > 0) {
        breaks0[brIx++] = text.length + begin;
    }
    System.arraycopy(breaks0, 0, breaks = new int[brIx], 0, brIx);
}
 

private void string(Object obj) {
    add('"');
    CharacterIterator it = new StringCharacterIterator(obj.toString());
    for (char c = it.first(); c != CharacterIterator.DONE; c = it.next()) {
        if (c == '"') { add("\\\""); } else if (c == '\\') { add("\\\\"); } else if (c == '/') { add("\\/"); } else if (c == '\b') {
            add("\\b");
        } else if (c
                == '\f') { add("\\f"); } else if (c == '\n') {
            add("\\n");
        } else if (c
                == '\r') { add("\\r"); } else if (c
                == '\t') { add("\\t"); } else if (Character
                .isISOControl(c)) {
            unicode(c);
        } else {
            add(c);
        }
    }
    add('"');
}
 

/**
 * Sets the current iteration position to the beginning of the text.
 * (i.e., the CharacterIterator's starting offset).
 * @return The offset of the beginning of the text.
 */
@Override
public int first() {
    CharacterIterator t = getText();

    t.first();
    return t.getIndex();
}
 

public StandardGlyphVector(Font font, CharacterIterator iter, FontRenderContext frc) {
    int offset = iter.getBeginIndex();
    char[] text = new char [iter.getEndIndex() - offset];
    for(char c = iter.first();
        c != CharacterIterator.DONE;
        c = iter.next()) {
        text[iter.getIndex() - offset] = c;
    }
    init(font, text, 0, text.length, frc, UNINITIALIZED_FLAGS);
}
 

public StandardGlyphVector(Font font, CharacterIterator iter, FontRenderContext frc) {
    int offset = iter.getBeginIndex();
    char[] text = new char [iter.getEndIndex() - offset];
    for(char c = iter.first();
        c != CharacterIterator.DONE;
        c = iter.next()) {
        text[iter.getIndex() - offset] = c;
    }
    init(font, text, 0, text.length, frc, UNINITIALIZED_FLAGS);
}
 

/**
 * Sets the current iteration position to the beginning of the text.
 * (i.e., the CharacterIterator's starting offset).
 * @return The offset of the beginning of the text.
 */
@Override
public int first() {
    CharacterIterator t = getText();

    t.first();
    return t.getIndex();
}
 

public StandardGlyphVector(Font font, CharacterIterator iter, FontRenderContext frc) {
    int offset = iter.getBeginIndex();
    char[] text = new char [iter.getEndIndex() - offset];
    for(char c = iter.first();
        c != CharacterIterator.DONE;
        c = iter.next()) {
        text[iter.getIndex() - offset] = c;
    }
    init(font, text, 0, text.length, frc, UNINITIALIZED_FLAGS);
}
 

/**
 * Returns a string based on the input string, but with all characters
 * with ordinal values < 32 or >= 128 replaced with ' '.
 * 
 * @param src - The string to clean
 * 
 * @return The original string if it does not contain any characters
 *     outside the allowed range, or a new string with any characters
 *     outside the allowed range converted to ' '
 */
public static String cleanString(String src) {
    if (src == null) {
        return null;
    }

    boolean foundBad = false;
    final CharacterIterator it = new StringCharacterIterator(src);
    for (char c = it.first(); c != CharacterIterator.DONE; c = it.next()) {
        if (c < ASCII_PRINTABLE_LOW || c >= ASCII_PRINTABLE_HI) {
            foundBad = true;
            break;
        }
    }

    if (!foundBad) {
        return src;
    }

    final StringBuilder res = new StringBuilder();
    for (char c = it.first(); c != CharacterIterator.DONE; c = it.next()) {
        if (c < ASCII_PRINTABLE_LOW || c >= ASCII_PRINTABLE_HI) {
            res.append(ASCII_SPACE);
        } else {
            res.append(c);
        }
    }

    return res.toString();
}
 

/**
 * For the given string, returns the number of UTF-8 bytes
 * required to encode the string.
 * @param string text to encode
 * @return number of UTF-8 bytes required to encode
 */
public static int utf8Length(String string) {
  CharacterIterator iter = new StringCharacterIterator(string);
  char ch = iter.first();
  int size = 0;
  while (ch != CharacterIterator.DONE) {
    if ((ch >= 0xD800) && (ch < 0xDC00)) {
      // surrogate pair?
      char trail = iter.next();
      if ((trail > 0xDBFF) && (trail < 0xE000)) {
        // valid pair
        size += 4;
      } else {
        // invalid pair
        size += 3;
        iter.previous(); // rewind one
      }
    } else if (ch < 0x80) {
      size++;
    } else if (ch < 0x800) {
      size += 2;
    } else {
      // ch < 0x10000, that is, the largest char value
      size += 3;
    }
    ch = iter.next();
  }
  return size;
}
 

/**
 * For the given string, returns the number of UTF-8 bytes
 * required to encode the string.
 * @param string text to encode
 * @return number of UTF-8 bytes required to encode
 */
public static int utf8Length(String string) {
    CharacterIterator iter = new StringCharacterIterator(string);
    char ch = iter.first();
    int size = 0;
    while (ch != CharacterIterator.DONE) {
        if ((ch >= 0xD800) && (ch < 0xDC00)) {
            // surrogate pair?
            char trail = iter.next();
            if ((trail > 0xDBFF) && (trail < 0xE000)) {
                // valid pair
                size += 4;
            } else {
                // invalid pair
                size += 3;
                iter.previous(); // rewind one
            }
        } else if (ch < 0x80) {
            size++;
        } else if (ch < 0x800) {
            size += 2;
        } else {
            // ch < 0x10000, that is, the largest char value
            size += 3;
        }
        ch = iter.next();
    }
    return size;
}
 

/**
 * Sets the current iteration position to the beginning of the text.
 * (i.e., the CharacterIterator's starting offset).
 * @return The offset of the beginning of the text.
 */
@Override
public int first() {
    CharacterIterator t = getText();

    t.first();
    return t.getIndex();
}
 

/**
 * Sets the current iteration position to the beginning of the text.
 * (i.e., the CharacterIterator's starting offset).
 * @return The offset of the beginning of the text.
 */
@Override
public int first() {
    CharacterIterator t = getText();

    t.first();
    return t.getIndex();
}
 

private void string(Object obj) {
    add('"');
    CharacterIterator it = new StringCharacterIterator(obj.toString());
    for (char c = it.first(); c != CharacterIterator.DONE; c = it.next()) {
        if (c == '"')
            add("\\\"");
        else if (c == '\\')
            add("\\\\");
        else if (c == '/')
            add("\\/");
        else if (c == '\b')
            add("\\b");
        else if (c == '\f')
            add("\\f");
        else if (c == '\n')
            add("\\n");
        else if (c == '\r')
            add("\\r");
        else if (c == '\t')
            add("\\t");
        else if (Character.isISOControl(c)) {
            unicode(c);
        } else {
            add(c);
        }
    }
    add('"');
}
 

/**
 * Sets the current iteration position to the beginning of the text.
 * (i.e., the CharacterIterator's starting offset).
 * @return The offset of the beginning of the text.
 */
@Override
public int first() {
    CharacterIterator t = getText();

    t.first();
    return t.getIndex();
}
 

public StandardGlyphVector(Font font, CharacterIterator iter, FontRenderContext frc) {
    int offset = iter.getBeginIndex();
    char[] text = new char [iter.getEndIndex() - offset];
    for(char c = iter.first();
        c != CharacterIterator.DONE;
        c = iter.next()) {
        text[iter.getIndex() - offset] = c;
    }
    init(font, text, 0, text.length, frc, UNINITIALIZED_FLAGS);
}
 

/**
 * Sets the current iteration position to the beginning of the text.
 * (i.e., the CharacterIterator's starting offset).
 * @return The offset of the beginning of the text.
 */
public int first() {
    CharacterIterator t = getText();

    t.first();
    return t.getIndex();
}
 

IncrementalBuffer(CharacterIterator chars)
{
	this.atEnd = false;
	this.chars = chars;
	this.current = chars != null ? chars.first() : CharacterIterator.DONE;
}
 

/**
 * Escapes a string to make it usable in JavaScript.
 * @param s input string
 * @return escaped string, without quotes
 */
public static String makeJavaScriptString( String s )
{
	StringBuffer output = new StringBuffer( s.length( ) );
	CharacterIterator it = new StringCharacterIterator(s);		
	for (char c = it.first(); c != CharacterIterator.DONE; c = it.next())
	{
		switch ( c )
		{
			// backspace
			case 0x08:
				output.append( BACKSLASH + "b" );
				break;
			// tab
			case 0x09:
				output.append( BACKSLASH + "t" );
				break;
			// newline
			case 0x0A:
				output.append( BACKSLASH + "n" );
				break;
			// form feed
			case 0x0C:
				output.append( BACKSLASH + "f" );
				break;
			// carriage return
			case 0x0D:
				output.append( BACKSLASH + "r" );
				break;
			// single quote
			case 0x27:
			// double quote
			case 0x22:
			// slash
			case 0x2F:
			// backslash
			case 0x5C:
				output.append( BACKSLASH + c );
				break;
			// string ranges
			default:
				output.append( c );
		}			
	}
	return output.toString();
}