package ca.uhn.hl7v2.hoh.util;
   
   import java.io.ByteArrayInputStream;
   import java.io.InputStreamReader;
   import java.nio.charset.Charset;
   
   public class StringUtils {
   
   	public static final String LINE_SEP = System.getProperty("line.separator");
  
  	/**
  	 * Null safe equals comparison
  	 */
  	public static boolean equals(String theString1, String theString2) {
  		if (theString1 == null && theString2 == null) {
  			return true;
  		}
  		if (theString1 == null || theString2 == null) {
  			return false;
  		}
  		return theString1.equals(theString2);
  	}
  
  	public static boolean isNotBlank(String theString) {
  		return !isBlank(theString);
  	}
  
  	public static boolean isBlank(String theString) {
  		int strLen;
  		if (theString == null || (strLen = theString.length()) == 0) {
  			return true;
  		}
  		for (int i = 0; i < strLen; i++) {
  			if ((!Character.isWhitespace(theString.charAt(i)))) {
  				return false;
  			}
  		}
  		return true;
  	}
  
  	public static String defaultString(String theString) {
  		if (theString == null) {
  			return "";
  		}
  		return theString;
  	}
  
  	public static String asciiEscape(byte[] theBytes, Charset theCharset) {
  		StringBuilder b = new StringBuilder();
  
  		try {
  			InputStreamReader reader = new InputStreamReader(new ByteArrayInputStream(theBytes), theCharset);
  			while (reader.ready()) {
  				char read = (char) reader.read();
  				if (read < 32) {
  					b.append('[').append((int) read).append(']');
  				} else {
  					b.append(read);
  				}
  			}
  		} catch (Exception e) {
  			b.append("ERROR: ").append(e.toString());
  		}
  		return b.toString();
  	}
  
  }