package cz.cuni.amis.utils;
   
   import java.util.Arrays;
   
   /**
    * You will stuff strings into the object and it will check whether the 'limiter'
    * is present. If so, it will cut the string buffer along the 'limiter' and return
    * you the parts.
    * 
   * @author Jimmy
   */
  public class StringCutter {
  		
  	private String limiter = "\r\n";
  	
  	private StringBuffer buffer = new StringBuffer(200);
  	
  	private String[] empty = new String[0];
  	
  	/**
  	 * Default limiter is "\r\n" (windows new line).
  	 */
  	public StringCutter() {			
  	}
  	
  	public StringCutter(String limiter) {
  		this.limiter = limiter;
  	}
  	
  	/**
  	 * Adding string to the buffer, returning strings if 'limiter' is found.
  	 * If no limiter is present, returns String[0].
  	 * @param str
  	 * @return
  	 */
  	public String[] add(String str) {
  		buffer.append(str);
  		if (buffer.indexOf(limiter) > 0) {
  			String bufferString = buffer.toString();
  			String[] strs = bufferString.split(limiter);
  			String[] result;
  			if (bufferString.endsWith(limiter)) {
  				result = strs;
  				buffer.delete(0, buffer.length());
  			} else {
  				result = Arrays.copyOf(strs, strs.length-1);
  				buffer.delete(0, buffer.length());
  				buffer.append(strs[strs.length-1]);
  			}
  			return result;
  		}	
  		return empty;			
  	}
  	
  	/**
  	 * Clear the string buffer.
  	 */
  	public void clear() {
  		buffer.delete(0, buffer.length());
  	}
  	
  }