Class StringBuilder

classpath/java/lang/StringBuilder.java:13–384

package java.lang;

public class StringBuilder implements CharSequence, Appendable {
  private static final int BufferSize = 32;

  private Cell chain;
  private int length;
  private char[] buffer;
  private int position;

  public StringBuilder(String s) {
    append(s);
  }

  public StringBuilder(int capacity) { }

  public StringBuilder() {
    this(0);
  }

  private void flush() {
    if (position > 0) {
      chain = new Cell(new String(buffer, 0, position, false), chain);
      buffer = null;
      position = 0;
    }
  }

  public StringBuilder append(String s) {
    if (s == null) {
      return append("null");
    } else {
      if (s.length() > 0) {
        if (buffer != null && s.length() <= buffer.length - position) {
          s.getChars(0, s.length(), buffer, position);
          position += s.length();
        } else {
          flush();
          chain = new Cell(s, chain);
        }
        length += s.length();
      }
      return this;
    }
  }

  public StringBuilder append(StringBuffer sb) {
    return append(sb.toString());
  }

  public StringBuilder append(CharSequence sequence) {
    return append(sequence.toString());
  }

  public Appendable append(CharSequence sequence, int start, int end) {
    return append(sequence.subSequence(start, end));
  }

  public StringBuilder append(char[] b, int offset, int length) {
    return append(new String(b, offset, length));