Examples of java.lang.StringBuffer

java.lang.StringBuffer
A thread-safe, mutable sequence of characters. A string buffer is like a {@link String}, but can be modified. At any point in time it contains some particular sequence of characters, but the length and content of the sequence can be changed through certain method calls.
String buffers are safe for use by multiple threads. The methods are synchronized where necessary so that all the operations on any particular instance behave as if they occur in some serial order that is consistent with the order of the method calls made by each of the individual threads involved.
The principal operations on a StringBuffer are the append and insert methods, which are overloaded so as to accept data of any type. Each effectively converts a given datum to a string and then appends or inserts the characters of that string to the string buffer. The append method always adds these characters at the end of the buffer; the insert method adds the characters at a specified point.
For example, if z refers to a string buffer object whose current contents are "start", then the method call z.append("le") would cause the string buffer to contain "startle", whereas z.insert(4, "le") would alter the string buffer to contain "starlet".
In general, if sb refers to an instance of a StringBuffer, then sb.append(x) has the same effect as sb.insert(sb.length(), x).
Whenever an operation occurs involving a source sequence (such as appending or inserting from a source sequence) this class synchronizes only on the string buffer performing the operation, not on the source.
Every string buffer has a capacity. As long as the length of the character sequence contained in the string buffer does not exceed the capacity, it is not necessary to allocate a new internal buffer array. If the internal buffer overflows, it is automatically made larger. As of release JDK 5, this class has been supplemented with an equivalent class designed for use by a single thread, {@link StringBuilder}. The StringBuilder class should generally be used in preference to this one, as it supports all of the same operations but it is faster, as it performs no synchronization. @author Arthur van Hoff @version 1.101, 11/17/05 @see java.lang.StringBuilder @see java.lang.String @since JDK1.0

   * @param sDelimiter Delimiter for elements in resulting String
   * @return List joined as a String
   */
  public static String join (Collection oList, String sDelimiter) {
    // Join a Collection into a single String
    StringBuffer oBuff = new StringBuffer(oList.size()*(32+sDelimiter.length())+1);
    Iterator oIter = oList.iterator();
    boolean bFirst = true;
    
    while (oIter.hasNext()) {
      if (bFirst) {
        bFirst = false;
      } else {
        oBuff.append(sDelimiter);
      }
      oBuff.append(oIter.next());
    } // wend()


    oIter = null;


    return oBuff.toString();
  } // join

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    final int iCount = aList.length;
    if (iCount==0) return "";
    if (null==sDelimiter) sDelimiter="";


    // Join an array into a single String
    StringBuffer oBuff = new StringBuffer(iCount*(32+sDelimiter.length())+1);
    oBuff.append(aList[0]);
    for (int s=1; s<iCount; s++) {
      oBuff.append(sDelimiter);
      oBuff.append(aList[s]);
    }
    return oBuff.toString();
  } // join

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    if (len<0)
      throw new IndexOutOfBoundsException("Gadgets.fill() numbers of characters must be greater than or equal to zero");
    else if (len==0)
      return "";
    else {
      StringBuffer oStrBuff = new StringBuffer(len);
      for (int i=0; i<len; i++) oStrBuff.append(c);
      return oStrBuff.toString();
    }
  } // fill

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   */
  public static String repeat (String sSubStr, int nTimes)
    throws IndexOutOfBoundsException {
    if (null==sSubStr) return null;
    if (sSubStr.length()==0) return "";
    StringBuffer oStrBuff = new StringBuffer(sSubStr.length()*nTimes);
    for (int t=0; t<nTimes; t++) oStrBuff.append(sSubStr);
    return oStrBuff.toString();
  } // repeat

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   */
  public static String replace(String sSource, char cSought, String sNewVal) throws NullPointerException {
    if (null==sSource) return null;
    int nLen = sSource.length();
  if (0==nLen) return "";
    StringBuffer oOut = new StringBuffer(nLen+100);
    if (sNewVal.length()==0) {
      for (int c=0; c<nLen; c++) {
        char cAt = sSource.charAt(c);
        if (cAt!=cSought) oOut.append(cAt);
      } // next
    } else {
      for (int c=0; c<nLen; c++) {
        char cAt = sSource.charAt(c);
        if (cAt==cSought)
          oOut.append(sNewVal);
        else
          oOut.append(cAt);
      } // next
    }
    return oOut.toString();
  } // replace

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    } else {
      final int iLen = sSource.length();
      ArrayList oTokens = new ArrayList();
      char cTextQualifier = (char) 0;
      char cCurrentChar;
      StringBuffer oCurrentToken = new StringBuffer(256);
      for (int p=0; p<iLen; p++) {
        cCurrentChar = sSource.charAt(p);
        switch (cCurrentChar) {
          case ' ':
            if (0!=cTextQualifier) {
              oCurrentToken.append(cCurrentChar);
            } else if (oCurrentToken.length()>0) {
              oTokens.add(oCurrentToken.toString());
              oCurrentToken.setLength(0);
            }
            break;
          case '\\':
            if (p==iLen-1) throw new StringIndexOutOfBoundsException("Input string terminated with a single backslash character");
            switch (sSource.charAt(++p)) {
              case 'n':
                oCurrentToken.append('\n');
                break;
              case 't':
                oCurrentToken.append('\t');
                break;
              case '\\':
                oCurrentToken.append('\\');
                break;
              case '"':
                oCurrentToken.append('"');
                break;
              default:
                throw new StringIndexOutOfBoundsException("Unrecognized escape sequence \\"+sSource.charAt(p)+" at "+sSource.substring(p-5>=0 ? p-5 : 0, p+5<=sSource.length()-1 ? p+5 : sSource.length()-1));
            } // end switch (charAt(++p))
            break;
          case '"':
            if (0==cTextQualifier) {
              cTextQualifier='"';
            } else if ('"'==cTextQualifier) {
              cTextQualifier=(char)0;
            }
            break;
          case '\'':
            if (0==cTextQualifier) {
              cTextQualifier='\'';
            } else if ('\''==cTextQualifier) {
              cTextQualifier=(char)0;
            }
            break;
          case ',':
          case ';':
          case '(':
          case ')':
          case '[':
          case ']':
          case '{':
          case '}':
          case '-':
          case '+':
          case '/':
          case '*':
          case '=':
          case '&':
          case '!':
          case '?':
            if (0!=cTextQualifier) {
              oCurrentToken.append(cCurrentChar);
            }
            else  {
              if (oCurrentToken.length()>0) {
                oTokens.add(oCurrentToken.toString());
                oCurrentToken.setLength(0);
              }
              oTokens.add(new String(new char[]{cCurrentChar}));
            }
            break;
          default:
            oCurrentToken.append(cCurrentChar);
        }
      } // next
      if (oCurrentToken.length()>0) {
        oTokens.add(oCurrentToken.toString());
      }
      aTokens=new String[oTokens.size()];
      System.arraycopy(oTokens.toArray(),0,aTokens,0,aTokens.length);
    }


    if (DebugFile.trace) {
      StringBuffer oOutput = new StringBuffer();
      if (aTokens!=null)
        for (int t=0; t<aTokens.length; t++)
          oOutput.append(aTokens[t]+(t<aTokens.length-1 ? "¶" :""));
      DebugFile.decIdent();
      DebugFile.writeln("End Gadgets.tokenizeCmdLine() : " + oOutput.toString());
    }


    return aTokens;
  } // tokenizeCmdLine

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  public static String removeChar(String sInput, char cRemove) {
    if (null==sInput) return null;
    if (sInput.length()==0) return sInput;


    final int iLen = sInput.length();
    StringBuffer oOutput = new StringBuffer(iLen);


    for (int i=0; i<iLen; i++) {
      char c = sInput.charAt(i);
      if (cRemove!=c)
        oOutput.append(c);
    } // next


    return oOutput.toString();
  } // removeChar

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    if (null==sRemove) return sInput;
    if (sInput.length()==0) return sInput;
    if (sRemove.length()==0) return sInput;


    final int iLen = sInput.length();
    StringBuffer oOutput = new StringBuffer(iLen);


    for (int i=0; i<iLen; i++) {
      char c = sInput.charAt(i);
      if (sRemove.indexOf(c)<0)
        oOutput.append(c);
    } // next


    return oOutput.toString();
  } // removeChars

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    if (null==sInput) return null;
    
    final int nLen = sInput.length();
    if (nLen==0) return "";
    
    StringBuffer oOutput = new StringBuffer(nLen+100);
  char cAt;
  for (int c=0; c<nLen; c++) {
    cAt = sInput.charAt(c);
    if (sSpecialSet.indexOf(cAt)>=0)
    oOutput.append(cEsc);
    oOutput.append(cAt);
  } // next
  return oOutput.toString();
  } // escapeChars

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        }
        return false;
    }
    
    public String getDescription() {
        StringBuffer buf = new StringBuffer();
        for (int i = 0; i < _extensions.size(); i++) {
            buf.append(_descriptions.get(i));
            buf.append(" (*.");
            buf.append(_extensions.get(i));
            buf.append(")");
            if (i < _extensions.size() - 1)
                buf.append("; ");
        }
        return buf.toString();
    }

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