RLEStringRunIterator.java :  » Game » droidlife » org » jtb » droidlife » Android Open Source

package org.jtb.droidlife;

public class RLEStringRunIterator {
  private String line = null;
  private int position = 0;

  public RLEStringRunIterator(String line) {
    this.line = line;
  }

  public RLERun next() {
    if (!hasNext()) {
      return null;
    }

    RLERun run = new RLERun();
    String n = "";
    while (line.charAt(position) >= '0' && line.charAt(position) <= '9') {
      n += line.charAt(position++);
    }
    if (n.length() > 0) {
      run.length = Integer.parseInt(n);
    } else {
      run.length = 1;
    }
    if (line.charAt(position) == 'b') {
      run.type = RLERun.Type.DEAD;
    } else if (line.charAt(position) == '$') {
      run.type = RLERun.Type.EOL;
    } else {
      run.type = RLERun.Type.ALIVE;
    }
    position++;

    return run;
  }

  public boolean hasNext() {
    return position < line.length() && line.charAt(position) != '!';
  }
}