- package java.awt.font;
-
- import java.text.CharacterIterator;
-
- class CharArrayIterator implements CharacterIterator {
-
- private char[] chars;
- private int pos;
- private int begin;
-
- CharArrayIterator(char[] chars) {
-
- reset(chars, 0);
- }
-
- CharArrayIterator(char[] chars, int begin) {
-
- reset(chars, begin);
- }
-
- /**
- * Sets the position to getBeginIndex() and returns the character at that
- * position.
- * @return the first character in the text, or DONE if the text is empty
- * @see getBeginIndex
- */
- public char first() {
-
- pos = 0;
- return current();
- }
-
- /**
- * Sets the position to getEndIndex()-1 (getEndIndex() if the text is empty)
- * and returns the character at that position.
- * @return the last character in the text, or DONE if the text is empty
- * @see getEndIndex
- */
- public char last() {
-
- if (chars.length > 0) {
- pos = chars.length-1;
- }
- else {
- pos = 0;
- }
- return current();
- }
-
- /**
- * Gets the character at the current position (as returned by getIndex()).
- * @return the character at the current position or DONE if the current
- * position is off the end of the text.
- * @see getIndex
- */
- public char current() {
-
- if (pos >= 0 && pos < chars.length) {
- return chars[pos];
- }
- else {
- return DONE;
- }
- }
-
- /**
- * 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.
- * @return the character at the new position or DONE if the new
- * position is off the end of the text range.
- */
- public char next() {
-
- if (pos < chars.length-1) {
- pos++;
- return chars[pos];
- }
- else {
- pos = chars.length;
- return DONE;
- }
- }
-
- /**
- * 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.
- * @return the character at the new position or DONE if the current
- * position is equal to getBeginIndex().
- */
- public char previous() {
-
- if (pos > 0) {
- pos--;
- return chars[pos];
- }
- else {
- pos = 0;
- return DONE;
- }
- }
-
- /**
- * Sets the position to the specified position in the text and returns that
- * character.
- * @param position the position within the text. Valid values range from
- * getBeginIndex() to getEndIndex(). An IllegalArgumentException is thrown
- * if an invalid value is supplied.
- * @return the character at the specified position or DONE if the specified position is equal to getEndIndex()
- */
- public char setIndex(int position) {
-
- position -= begin;
- if (position < 0 || position > chars.length) {
- throw new IllegalArgumentException("Invalid index");
- }
- pos = position;
- return current();
- }
-
- /**
- * Returns the start index of the text.
- * @return the index at which the text begins.
- */
- public int getBeginIndex() {
- return begin;
- }
-
- /**
- * Returns the end index of the text. This index is the index of the first
- * character following the end of the text.
- * @return the index after the last character in the text
- */
- public int getEndIndex() {
- return begin+chars.length;
- }
-
- /**
- * Returns the current index.
- * @return the current index.
- */
- public int getIndex() {
- return begin+pos;
- }
-
- /**
- * Create a copy of this iterator
- * @return A copy of this
- */
- public Object clone() {
- CharArrayIterator c = new CharArrayIterator(chars, begin);
- c.pos = this.pos;
- return c;
- }
-
- void reset(char[] chars) {
- reset(chars, 0);
- }
-
- void reset(char[] chars, int begin) {
-
- this.chars = chars;
- this.begin = begin;
- pos = 0;
- }
- }