Interface CharacterIterator

All Superinterfaces:

Cloneable

All Known Subinterfaces:

AttributedCharacterIterator

All Known Implementing Classes:

Segment, StringCharacterIterator

public interface CharacterIterator
extends Cloneable

public void traverseForward(CharacterIterator iter) {
     for(char c = iter.first(); c != CharacterIterator.DONE; c = iter.next()) {
         processChar(c);
     }
 }

public void traverseBackward(CharacterIterator iter) {
     for(char c = iter.last(); c != CharacterIterator.DONE; c = iter.previous()) {
         processChar(c);
     }
 }

public void traverseOut(CharacterIterator iter, int pos) {
     for (char c = iter.setIndex(pos);
              c != CharacterIterator.DONE && notBoundary(c);
              c = iter.next()) {
     }
     int end = iter.getIndex();
     for (char c = iter.setIndex(pos);
             c != CharacterIterator.DONE && notBoundary(c);
             c = iter.previous()) {
     }
     int start = iter.getIndex();
     processSection(start, end);
 }

See Also:

StringCharacterIterator, AttributedCharacterIterator

Fields

DONE

static final char DONE

Constant that is returned when the iterator has reached either the end or the beginning of the text. The value is '\\uFFFF', the "not a character" value which should not occur in any valid Unicode string.

Methods

first

char first()

Sets the position to getBeginIndex() and returns the character at that position.

Returns:

the first character in the text, or DONE if the text is empty

See Also:

getBeginIndex()

last

char last()

Sets the position to getEndIndex()-1 (getEndIndex() if the text is empty) and returns the character at that position.

Returns:

the last character in the text, or DONE if the text is empty

See Also:

getEndIndex()

current

char current()

Gets the character at the current position (as returned by getIndex()).

Returns:

the character at the current position or DONE if the current position is off the end of the text.

See Also:

getIndex()

next

char next()

Increments the iterator's index by one and returns the character at the new index. If the resulting index is greater or equal to getEndIndex(), the current index is reset to getEndIndex() and a value of DONE is returned.

Returns:

the character at the new position or DONE if the new position is off the end of the text range.

previous

char previous()

Decrements the iterator's index by one and returns the character at the new index. If the current index is getBeginIndex(), the index remains at getBeginIndex() and a value of DONE is returned.

Returns:

the character at the new position or DONE if the current position is equal to getBeginIndex().

setIndex

char setIndex(int position)

Sets the position to the specified position in the text and returns that character.

Parameters:

position - the position within the text. Valid values range from getBeginIndex() to getEndIndex(). An IllegalArgumentException is thrown if an invalid value is supplied.

Returns:

the character at the specified position or DONE if the specified position is equal to getEndIndex()

getBeginIndex

int getBeginIndex()

Returns the start index of the text.

Returns:

the index at which the text begins.

getEndIndex

int getEndIndex()

Returns the end index of the text. This index is the index of the first character following the end of the text.

Returns:

the index after the last character in the text

getIndex

int getIndex()

Returns the current index.

Returns:

the current index.

clone

Object clone()

Create a copy of this iterator

Returns:

A copy of this