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   fileTemplate    the regex to be used to identify dspace log files
     */
    public static void setRegex(String fileTemplate)
    {
        // build the exclude characters regular expression
        StringBuffer charRegEx = new StringBuffer();
        charRegEx.append("[");
        for (int i = 0; i < excludeChars.size(); i++)
        {
            charRegEx.append("\\" + (String) excludeChars.get(i));
        }
        charRegEx.append("]");
        excludeCharRX = Pattern.compile(charRegEx.toString());
        
        // regular expression to find handle indicators in strings
        handleRX = Pattern.compile("handle=");
        
        // regular expression to find item_id indicators in strings
        itemRX = Pattern.compile(",item_id=.*$");
        
        // regular expression to find query indicators in strings
        queryRX = Pattern.compile("query=");
        
        // regular expression to find collections in strings
        collectionRX = Pattern.compile("collection_id=[0-9]*,");
        
        // regular expression to find communities in strings
        communityRX = Pattern.compile("community_id=[0-9]*,");
        
        // regular expression to find search result sets
        resultsRX = Pattern.compile(",results=(.*)");
        
        // regular expressions to find single characters anywhere in the string
        singleRX = Pattern.compile("( . |^. | .$)");
        
        // set up the standard log file line regular expression
        String logLine13 = "^(\\d\\d\\d\\d-\\d\\d\\-\\d\\d) \\d\\d:\\d\\d:\\d\\d,\\d\\d\\d (\\w+)\\s+\\S+ @ ([^:]+):[^:]+:([^:]+):(.*)";
        String logLine14 = "^(\\d\\d\\d\\d-\\d\\d\\-\\d\\d) \\d\\d:\\d\\d:\\d\\d,\\d\\d\\d (\\w+)\\s+\\S+ @ ([^:]+):[^:]+:[^:]+:([^:]+):(.*)";
        valid13 = Pattern.compile(logLine13);
        valid14 = Pattern.compile(logLine14);
        
        // set up the pattern for validating log file names
        logRegex = Pattern.compile(fileTemplate);
        
        // set up the pattern for matching any of the query types
        StringBuffer typeRXString = new StringBuffer();
        typeRXString.append("(");
        for (int i = 0; i < excludeTypes.size(); i++)
        {
            if (i > 0)
            {
                typeRXString.append("|");
            }
            typeRXString.append((String) excludeTypes.get(i));
        }
        typeRXString.append(")");
        typeRX = Pattern.compile(typeRXString.toString());
        
        // set up the pattern for matching any of the words to exclude
        StringBuffer wordRXString = new StringBuffer();
        wordRXString.append("(");
        for (int i = 0; i < excludeWords.size(); i++)
        {
            if (i > 0)
            {
                wordRXString.append("|");
            }
            wordRXString.append(" " + (String) excludeWords.get(i) + " ");
            wordRXString.append("|");
            wordRXString.append("^" + (String) excludeWords.get(i) + " ");
            wordRXString.append("|");
            wordRXString.append(" " + (String) excludeWords.get(i) + "$");
        }
        wordRXString.append(")");
        wordRX = Pattern.compile(wordRXString.toString());
        
        return;
    }

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                        " WHERE element = 'type' " +
                        " AND qualifier IS NULL) ";
        }
        
        // start the date constraint query buffer
        StringBuffer dateQuery = new StringBuffer();
        if (oracle)
        {
            dateQuery.append("SELECT /*+ ORDERED_PREDICATES */ item_id ");
        }
        else
        {
            dateQuery.append("SELECT item_id ");
        }


        dateQuery.append("FROM metadatavalue " +
                          "WHERE metadata_field_id = (" +
                          " SELECT metadata_field_id " +
                          " FROM metadatafieldregistry " +
                          " WHERE element = 'date' " +
                          " AND qualifier = 'accessioned') ");
      
        if (startDate != null)
        {
            if (oracle)
            {
                dateQuery.append(" AND TO_TIMESTAMP( TO_CHAR(text_value), "+
                        "'yyyy-mm-dd\"T\"hh24:mi:ss\"Z\"' ) > TO_DATE('" +
                        unParseDate(startDate) + "', 'yyyy-MM-dd') ");
            }
            else
            {
                dateQuery.append(" AND text_value::timestamp > '" +
                        unParseDate(startDate) + "'::timestamp ");
            }
        }


        if (endDate != null)
        {
            if (oracle)
            {
                dateQuery.append(" AND TO_TIMESTAMP( TO_CHAR(text_value), "+
                        "'yyyy-mm-dd\"T\"hh24:mi:ss\"Z\"' ) < TO_DATE('" +
                        unParseDate(endDate) + "', 'yyyy-MM-dd') ");
            }
            else
            {
                dateQuery.append(" AND text_value::timestamp < '" +
                        unParseDate(endDate) + "'::timestamp ");
            }
        }
        
        // build the final query
        StringBuffer query = new StringBuffer();
        
        query.append("SELECT COUNT(*) AS num " +
                  "FROM item " +
                  "WHERE in_archive = " + (oracle ? "1 " : "true ") +
                  "AND withdrawn = " + (oracle ? "0 " : "false "));
        
        if (startDate != null || endDate != null)
        {
            query.append(" AND item_id IN ( " +
                         dateQuery.toString() + ") ");
        }


        if (type != null)
        {
            query.append(" AND item_id IN ( " +
                         typeQuery + ") ");
        }
        
        TableRow row = DatabaseManager.querySingle(context, query.toString());


        Integer numItems;
        if (oracle)
        {
            numItems = new Integer(row.getIntColumn("num"));

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      if (tmp.length() == 0)
      {
        return tmp;
      }
      String arrRows [] = tmp.split("\n");
      StringBuffer sp = new StringBuffer ();
      int max = arrRows.length;
      String row;
      int cntTyhjia_riveja = 0;
      for(int i = 0; i < max; i++)
      {
        row = arrRows[i];
        if (row == null || row.trim().length() == 0)
        {          
          if (tyhjien_rivien_lkm < 1)
              continue;
          if (cntTyhjia_riveja >= tyhjien_rivien_lkm)
            continue;
           cntTyhjia_riveja++;
           sp.append("\n");
           continue;
        }
        cntTyhjia_riveja = 0;
        sp.append(removeSpacesFromBeginOfRow(row)+"\n");
      }
      
      return sp.toString();      
   }

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    }      
    
    char [] arrCh = tmp.toCharArray();
    int max = arrCh.length;
    StringTokenizer tokens = new StringTokenizer(tmp);
    StringBuffer sb = new StringBuffer();
    String token;
    
    for(;tokens.hasMoreTokens();)
    {
    token = tokens.nextToken();
    if (token == null)
      continue;
    if (token.trim().length() == 0)
    {
      //System.out.println("if (token.trim().length() == 0)");
      continue;
    }
    arrCh = tmp.trim().toCharArray();
    max = arrCh.length;
    boolean hasOnlyEnters = true;
    for(int i = 0; i < max; i++)
      if (Character.isLetterOrDigit(arrCh[i]))
      {
        hasOnlyEnters = false;
        break;
      }
    if (!hasOnlyEnters)
      sb.append(token +' ');    
    }
    
    //System.out.println("d:removeDupleSpace 4 tmp='" +tmp +"'");
    return sb.toString();
   }

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        public ConvertedRow
        removeOrConvertChars(String tmp, String [] arrSearch, 
            String [] arrReplace, boolean bRegexReplace,
            CharArea [] arrExcludeAreas)
        {
           StringBuffer sb = new StringBuffer();
           String strSearch, strReplace;
           
           int max_search = arrSearch.length;
           int max_replace = arrReplace.length;
       
           int max = tmp.length();
           byte [] arrByteChangedChars = new byte[max];
           for(int i = 0; i < max; i++)
           {
           arrByteChangedChars[i] = 0;
           }
           
           // String inputString = new String(tmp);
           
           char chCurrent = 0;
           char chReplace = 0;
           int ichCurrent;
           boolean bCharFounded = false;
         
           for(int k = 0 ; k < max; k++ )
         {
             chCurrent = tmp.charAt(k);
             ichCurrent = chCurrent;
             chReplace = chCurrent;
             bCharFounded = false;
             strReplace = null;
             for(int i = 0 ; i < max_search; i++ )
             {
                 strSearch = arrSearch[i];
               if (strSearch == null)
                 continue;
               if (strSearch.toString().trim().length() == 0)
               {
                 //System.out.println("if (token.trim().length() == 0)");
                 continue;
               }
               strReplace = arrReplace[i];
               /*
               if (tmp.contains(strMuutettava))
               {
                 int ind = tmp.indexOf(strMuutettava);
                 //System.out.println(strMuutettava +"='" + strMuutettava +" " +ind);
               }
               */
               if (strReplace == null)
                 strReplace = ""; // tmp = tmp.replaceAll(strSearch, "");
               
               char chSearch = 0; // testi koodia:
               if (strSearch.length()>0)
                  chSearch = strSearch.charAt(0);
               int iSearch = chSearch;
               char chReplaceNewValue = 0;
               if (strReplace.length()>0)
                 chReplaceNewValue = strReplace.charAt(0);
               int iReplaceNewValue = chReplaceNewValue; // testikoodia loppu
               // regex-muutos kutsu: jos regexin erikoismerkkejä hakuarvoissa, 
               // ne pitää koodata hakuarvoihin erikseen!!! Huom! Erotin merkkeinä \\\\
               // eli kääntäjä muuttaa sen ajossa \\ merkkeiksi.
               //if (bRegexReplace)
                 //tmp = tmp.replaceAll(strMuutettava, strkorvattava);
               //else
                 //tmp = replaceAll(tmp, strMuutettava, strkorvattava);
               if (chCurrent == chSearch)
               {
                 chReplace = chReplaceNewValue; 
                 bCharFounded = true;
                 break;
               }                              
             }
             //if (chReplace == chCurrent || chReplace != 0)
             if (!bCharFounded) 
               sb.append(chCurrent);
             else
             if (strReplace != null)
               sb.append(strReplace);
             if (bCharFounded && (strReplace != null
               && !strReplace.equals("" +chCurrent))
               || strReplace == null /* chReplace != chCurrent */ )
             arrByteChangedChars[k] = 1;
         }
                   
           /*  Vanhaa koodia; ei toimi, koska StringTokenizer ei selviydy jakamisesta
            * oikein esim: \\\\ , vaan ohittaa kyseisen kohdan siististi päätyen \\\\ 
            * kohdan jälkeiseen taulukon alkioon.
           StringTokenizer tokenMuutettavat = new StringTokenizer(muutettavatMerkit, haeMerkkeja);
           StringTokenizer tokenkorvattavat = new StringTokenizer(korvattavatMerkit, haeMerkkeja);
           */  
           //System.out.println("d:removeDupleSpace 4 tmp='" +tmp +"'");
           
           /*
           int maxEA = arrExcludeAreas.length;
           int ind, chEnd;
           CharArea ca;
           
         int max = tmp.length();
           byte [] arrByteChangedChars = new byte[max];
           for(int i = 0; i < max; i++)
           {
           arrByteChangedChars[i] = 0;
           }
              
           for(int i = 0; i < maxEA; i++)
           {
           ca = arrExcludeAreas[i];
           if (ca == null)
             continue;
           chEnd = ca.getChEndChar();
           for (int j = ca.getChStartChar(); j < chEnd; j++)
           {
             if (isCharIn((char)j, arrMuutettavat))
               continue;
             ind = tmp.indexOf("" + j);
             if (ind == -1)
               continue;
             arrByteChangedChars[i] = 1;  // wrong none-changed excluded char founded
           }
           }
           */
           return new ConvertedRow(tmp, sb.toString(), arrByteChangedChars);
           // return tmp;
            }

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     //}
     final String cnstII = "<i><i>";
     newData = tmp.replaceAll(cnstII, "<i>");
     tmp = newData;
     if (newData != null)
       sp = new StringBuffer(newData);
   }

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   private  String
   poistaKTaiIKoodinEdestaTyhjiaRivinvaihtojaJosOn()
   {
     int cntPTR = sp.length();
     int i = cntPTR-1; 
     StringBuffer spTmp = new StringBuffer (sp.toString());
       char ch;
       
     while(i > -1)
     {
       ch = spTmp.charAt(i);
       if ( ch != '\n' && !Character.isWhitespace(ch))
       {
         spTmp.append('\n');
         sp = spTmp;         
         return spTmp.toString();
       }
         


       spTmp.deleteCharAt(i);
       i--;
     }


     spTmp.append('\n');
     sp = spTmp;
     return spTmp.toString();
   }

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     int len = value.length(), i = 0;
     if (strErikoismerkkijono_rivin_alussa != null)
       i = strErikoismerkkijono_rivin_alussa.length();
     boolean isWhiteSpace = false;
     
     StringBuffer spTmp = new StringBuffer (value);
       
     while(cntPTR > 0 && i < len)
     {
       isWhiteSpace = false;
       if (!Character.isWhitespace(spTmp.charAt(i)))
         return false;
       isWhiteSpace = true; 
       spTmp.deleteCharAt(i);
       len = spTmp.length();
       cntPTR--;
     }


       //System.out.println("1strErikoismerkkijono_rivin_alussa=" + value);
     return true;

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         htValues.put(htKey, htValue);         
         
         bEkaKierros = false;
       }
       
       StringBuffer configIsMissing = new StringBuffer(); 
       if (str_readcharacterset == null)
         configIsMissing.append("config value readcharacterset is missing!\n");
       if (str_writecharacterset == null)
         configIsMissing.append("config value writecharacterset is missing!\n");
       /*
       if (str_allowedcharacterset == null)
         configIsMissing.append("config value allowedcharacterset is missing!\n");
       if (str_allowedcharareas == null)
         configIsMissing.append("config value allowedcharareas is missing!\n");
       */
       if (str_excludecharareas == null)
         configIsMissing.append("config value excludecharareas is missing!\n");
       
       if (configIsMissing.length() > 0)
         throw new CharConvertRowsException("Error: " + configIsMissing.toString());
       
       // arvoilla kutsutaan: m_dtBook2Genre.removeOrConvertChars(..,..,..)
       //m_strKorvattavat = spKorvattavat.toString().trim();
       //m_strMuutettavat  = spMuutettavat.toString().trim();
       Object arrObjMuutettavat [] =  htValues.keySet().toArray();

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   throws Exception
   {
     int i, iRow, iRowChar, indErrorPos, iChError, 
     iLen = text.length();     
    char ch, chCharSet;
     StringBuffer sbErrorRow = new StringBuffer();
     StringBuffer sbErrorData = new StringBuffer();
     boolean bErrorFounded = false;
     String strCh, strCharSet, strErrorRow;
     
     iRowChar = 0;
     iRow = 1;
     
     for(i = 0; i < iLen; i++)
     {
       iRowChar++;
       ch = text.charAt(i);
       if (ch == '\n')
       {
        iRowChar = 0;
        if (bErrorFounded)
        {
             m_bPossibleErrorCharachters = true;
             sbErrorData.append(sbErrorRow.toString());
        }
         bErrorFounded = false;
        strErrorRow = "";
        sbErrorRow = new StringBuffer ();
        // dddd sbErrorRowPosition
        iRow++;
       }
        
       strCh = "" + ch;

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