Examples of java.util.ListIterator

java.util.ListIterator
An iterator for lists that allows the programmer to traverse the list in either direction, modify the list during iteration, and obtain the iterator's current position in the list. A ListIterator has no current element; its cursor position always lies between the element that would be returned by a call to previous() and the element that would be returned by a call to next(). An iterator for a list of length n has n+1 possible cursor positions, as illustrated by the carets (^) below:
```
 Element(0)   Element(1)   Element(2)   ... Element(n-1) cursor positions:  ^            ^            ^            ^                  ^ 
```
Note that the {@link #remove} and {@link #set(Object)} methods arenot defined in terms of the cursor position; they are defined to operate on the last element returned by a call to {@link #next} or {@link #previous()}.
This interface is a member of the Java Collections Framework. @author Josh Bloch @version 1.28, 04/21/06 @see Collection @see List @see Iterator @see Enumeration @see List#listIterator() @since 1.2

    Object source = event.getSource();
    Object[] args = new Object[1];
    args[0] = event;


    // send event to all listeners except the source
    ListIterator iter = listeners.listIterator();
    while (iter.hasNext()) {
      Object client = iter.next();
      if (client == source)
        continue;


      try {
        method.invoke(client, args);
      } catch (IllegalAccessException e) {
        iter.remove();
        logger.error("ListenerManager IllegalAccessException", e);
      } catch (IllegalArgumentException e) {
        iter.remove();
        logger.error("ListenerManager IllegalArgumentException", e);
      } catch (InvocationTargetException e) {
        iter.remove();
        logger.error("ListenerManager InvocationTargetException on " + method+ " threw exception " + e.getTargetException(), e);
      }
    }
  }

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                                    InetAddress localAddr, int localPort ) {
        SmbTransport conn;


        synchronized( CONNECTIONS ) {
            if( SSN_LIMIT != 1 ) {
                ListIterator iter = CONNECTIONS.listIterator();
                while( iter.hasNext() ) {
                    conn = (SmbTransport)iter.next();
                    if( conn.matches( address, port, localAddr, localPort ) &&
                            ( SSN_LIMIT == 0 || conn.sessions.size() < SSN_LIMIT )) {
                        return conn;
                    }
                }

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        return getSmbSession( new NtlmPasswordAuthentication( null, null, null ));
    }
    synchronized SmbSession getSmbSession( NtlmPasswordAuthentication auth ) {
        SmbSession ssn;


        ListIterator iter = sessions.listIterator();
        while( iter.hasNext() ) {
            ssn = (SmbSession)iter.next();
            if( ssn.matches( auth )) {
                ssn.auth = auth;
                return ssn;
            }
        }

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        if( socket == null ) {
            inError = true;
        }


        ListIterator iter = sessions.listIterator();
        while( iter.hasNext() ) {
            ssn = (SmbSession)iter.next();
            ssn.logoff( inError );
        }
        if( socket != null ) {
            try {
                socket.close();

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                         * with challenge from 'server' to access DFS vol. */
        return dr;
    }
    synchronized DfsReferral lookupReferral( String unc ) {
        DfsReferral dr;
        ListIterator iter = referrals.listIterator();
        int i, len;


        while( iter.hasNext() ) {
            dr = (DfsReferral)iter.next();
            len = dr.path.length();
            for( i = 0; i < len && i < unc.length(); i++ ) {
                if( dr.path.charAt( i ) != unc.charAt( i )) {
                    break;
                }

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    throws SQLException, NullPointerException, IllegalStateException {
    int c;
    boolean bFound;
    Object oVal;
    DBColumn oDBCol;
    ListIterator oColIterator;
    PreparedStatement oStmt = null;
    ResultSet oRSet = null;


    if (null==oColumns)
      throw new IllegalStateException("DBTable.loadRegister() Table columns list not initialized");


    if (null==oConn)
      throw new NullPointerException("DBTable.loadRegister() Connection is null");


    if (DebugFile.trace) {
      DebugFile.writeln("Begin DBTable.loadRegister([Connection:"+oConn.pid()+"], Object[], [HashMap])" );
      DebugFile.incIdent();


      boolean bAllNull = true;
      for (int n=0; n<PKValues.length; n++)
        bAllNull &= (PKValues[n]==null);


      if (bAllNull)
        throw new NullPointerException(sName + " cannot retrieve register, value supplied for primary key is NULL.");
    }


    if (sSelect==null) {
      throw new SQLException("Primary key not found", "42S12");
    }


    AllValues.clear();


    bFound = false;


    try {


      if (DebugFile.trace) DebugFile.writeln("  Connection.prepareStatement(" + sSelect + ")");


      // Prepare SELECT sentence for reading
      oStmt = oConn.prepareStatement(sSelect);


      try {
        if (oConn.getDataBaseProduct()!=JDCConnection.DBMS_POSTGRESQL)
          oStmt.setQueryTimeout(10);
      }
      catch (SQLException sqle) {
        if (DebugFile.trace) DebugFile.writeln("Error at PreparedStatement.setQueryTimeout(10)" + sqle.getMessage());
      }




      // Bind primary key values
      for (int p=0; p<oPrimaryKeys.size(); p++) {
        if (DebugFile.trace) DebugFile.writeln("  binding primary key " + PKValues[p] + ".");


        oConn.bindParameter(oStmt, p+1, PKValues[p]);
        //oStmt.setObject(p+1, PKValues[p]);
      } // next


      if (DebugFile.trace) DebugFile.writeln("  Connection.executeQuery()");


      oRSet = oStmt.executeQuery();


      if (oRSet.next()) {
        if (DebugFile.trace) DebugFile.writeln("  ResultSet.next()");


        bFound = true;


        // Iterate throught readed columns
        // and store readed values at AllValues
        oColIterator = oColumns.listIterator();


        c = 1;
        while (oColIterator.hasNext()) {
          oVal = oRSet.getObject(c++);
          oDBCol = (DBColumn) oColIterator.next();
          if (null!=oVal)
            AllValues.put(oDBCol.getName(), oVal);
        }
      }

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    int c;
    boolean bNewRow = false;
    DBColumn oCol;
    String sCol;
    String sSQL = "";
    ListIterator oColIterator;
    int iAffected = 0;
    PreparedStatement oStmt = null;


    if (null==oConn)
      throw new NullPointerException("DBTable.storeRegister() Connection is null");


    if (DebugFile.trace)
      {
      DebugFile.writeln("Begin DBTable.storeRegister([Connection:"+oConn.pid()+"], {" + AllValues.toString() + "})" );
      DebugFile.incIdent();
      }


    try {
      if (null!=sUpdate) {
        if (DebugFile.trace) DebugFile.writeln("Connection.prepareStatement(" + sUpdate + ")");


        sSQL = sUpdate;


        oStmt = oConn.prepareStatement(sSQL);


        try {
          if (oConn.getDataBaseProduct()!=JDCConnection.DBMS_POSTGRESQL)
          oStmt.setQueryTimeout(10);
        } catch (SQLException sqle) {
          if (DebugFile.trace) DebugFile.writeln("Error at PreparedStatement.setQueryTimeout(10)" + sqle.getMessage());
        }


        c = 1;
        oColIterator = oColumns.listIterator();


        while (oColIterator.hasNext()) {
          oCol = (DBColumn) oColIterator.next();
          sCol = oCol.getName().toLowerCase();


          if (!oPrimaryKeys.contains(sCol) &&
              (sCol.compareTo(DB.dt_created)!=0)) {


            if (DebugFile.trace) {
              if (oCol.getSqlType()==java.sql.Types.CHAR || oCol.getSqlType()==java.sql.Types.VARCHAR) {


                if (AllValues.get(sCol)!=null) {
                  DebugFile.writeln("Binding " + sCol + "=" + AllValues.get(sCol).toString());


                  if (AllValues.get(sCol).toString().length() > oCol.getPrecision())
                    DebugFile.writeln("ERROR: value for " + oCol.getName() + " exceeds columns precision of " + String.valueOf(oCol.getPrecision()));
                } // fi (AllValues.get(sCol)!=null)
                else
                  DebugFile.writeln("Binding " + sCol + "=NULL");
              }
            } // fi (DebugFile.trace)


            try {
              oConn.bindParameter (oStmt, c, AllValues.get(sCol), oCol.getSqlType());
              c++;
            } catch (ClassCastException e) {
                if (AllValues.get(sCol)!=null)
                  throw new SQLException("ClassCastException at column " + sCol + " Cannot cast Java " + AllValues.get(sCol).getClass().getName() + " to SQL type " + oCol.getSqlTypeName(), "07006");
                else
                  throw new SQLException("ClassCastException at column " + sCol + " Cannot cast NULL to SQL type " + oCol.getSqlTypeName(), "07006");
            }


            } // endif (!oPrimaryKeys.contains(sCol))
          } // wend


        oColIterator = oPrimaryKeys.listIterator();
        while (oColIterator.hasNext()) {
          sCol = (String) oColIterator.next();
          oCol = getColumnByName(sCol);


          if (DebugFile.trace) DebugFile.writeln("PreparedStatement.setObject (" + String.valueOf(c) + "," + AllValues.get(sCol) + "," + oCol.getSqlTypeName() + ")");


          oConn.bindParameter (oStmt, c, AllValues.get(sCol), oCol.getSqlType());
          c++;
        } // wend


        if (DebugFile.trace) DebugFile.writeln("PreparedStatement.executeUpdate()");


    try {
          iAffected = oStmt.executeUpdate();
    } catch (SQLException sqle) {
          if (DebugFile.trace) {
            DebugFile.writeln("SQLException "+sqle.getMessage());
            DebugFile.decIdent();
          }
      oStmt.close();
      throw new SQLException(sqle.getMessage(), sqle.getSQLState(), sqle.getErrorCode());
    }


        if (DebugFile.trace) DebugFile.writeln(String.valueOf(iAffected) +  " affected rows");


        oStmt.close();
        oStmt = null;
      } // fi (sUpdate!=null)
      else
        iAffected = 0;


      if (0==iAffected)
          {
          bNewRow = true;


          if (DebugFile.trace) DebugFile.writeln("Connection.prepareStatement(" + sInsert + ")");


          sSQL = sInsert;


          oStmt = oConn.prepareStatement(sInsert);


          try { if (oConn.getDataBaseProduct()!=JDCConnection.DBMS_POSTGRESQL) oStmt.setQueryTimeout(10); } catch (SQLException sqle) { if (DebugFile.trace) DebugFile.writeln("Error at PreparedStatement.setQueryTimeout(10)" + sqle.getMessage()); }


          c = 1;
          oColIterator = oColumns.listIterator();


          while (oColIterator.hasNext()) {


            oCol  = (DBColumn)oColIterator.next();
            sCol = oCol.getName();


            if (DebugFile.trace) {
              if (null!=AllValues.get(sCol))
                DebugFile.writeln("Binding " + sCol + "=" + AllValues.get(sCol).toString());

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  public boolean storeRegisterLong(JDCConnection oConn, HashMap AllValues, HashMap BinaryLengths) throws IOException, SQLException {
    int c;
    boolean bNewRow = false;
    DBColumn oCol;
    String sCol;
    ListIterator oColIterator;
    PreparedStatement oStmt;
    int iAffected;


    LinkedList oStreams;
    InputStream oStream;
    String sClassName;


    if (null==oConn)
      throw new NullPointerException("DBTable.storeRegisterLong() Connection is null");


    if (DebugFile.trace)
      {
      DebugFile.writeln("Begin DBTable.storeRegisterLong([Connection:"+oConn.pid()+"], {" + AllValues.toString() + "})" );
      DebugFile.incIdent();
      }


    oStreams  = new LinkedList();


    if (null!=sUpdate) {


      if (DebugFile.trace) DebugFile.writeln("Connection.prepareStatement(" + sUpdate + ")");


      oStmt = oConn.prepareStatement(sUpdate);


      try { if (oConn.getDataBaseProduct()!=JDCConnection.DBMS_POSTGRESQL) oStmt.setQueryTimeout(10); } catch (SQLException sqle) { if (DebugFile.trace) DebugFile.writeln("Error at PreparedStatement.setQueryTimeout(10)" + sqle.getMessage()); }


      c = 1;
      oColIterator = oColumns.listIterator();
      while (oColIterator.hasNext()) {
        oCol = (DBColumn) oColIterator.next();
        sCol = oCol.getName().toLowerCase();


        if (!oPrimaryKeys.contains(sCol) &&
            (!sCol.equalsIgnoreCase(DB.dt_created))) {


          if (DebugFile.trace) {
            if (oCol.getSqlType()==java.sql.Types.CHAR || oCol.getSqlType()==java.sql.Types.VARCHAR) {
              if (AllValues.get(sCol) != null) {
                DebugFile.writeln("Binding " + sCol + "=" +
                                  AllValues.get(sCol).toString());
                if (AllValues.get(sCol).toString().length() > oCol.getPrecision())
                  DebugFile.writeln("ERROR: value for " + oCol.getName() +
                                    " exceeds columns precision of " +
                                    String.valueOf(oCol.getPrecision()));
              } // fi (AllValues.get(sCol)!=null)
              else
                DebugFile.writeln("Binding " + sCol + "=NULL");
            }
          } // fi (DebugFile.trace)


          if (oCol.getSqlType()==java.sql.Types.LONGVARCHAR || oCol.getSqlType()==java.sql.Types.CLOB || oCol.getSqlType()==java.sql.Types.LONGVARBINARY || oCol.getSqlType()==java.sql.Types.BLOB) {
            if (BinaryLengths.containsKey(sCol)) {
              if (((Long)BinaryLengths.get(sCol)).intValue()>0) {
                sClassName = AllValues.get(sCol).getClass().getName();
                if (sClassName.equals("java.io.File"))
                  oStream = new FileInputStream((File) AllValues.get(sCol));
                else if (sClassName.equals("[B"))
                  oStream = new ByteArrayInputStream((byte[]) AllValues.get(sCol));
                else if (sClassName.equals("[C"))
                  oStream = new StringBufferInputStream(new String((char[]) AllValues.get(sCol)));
                else {
                  Class[] aInts = AllValues.get(sCol).getClass().getInterfaces();
                  if (aInts==null) {
                    throw new SQLException ("Invalid object binding for column " + sCol);
                  } else {
                    boolean bSerializable = false;
                    for (int i=0; i<aInts.length &!bSerializable; i++)
                      bSerializable |= aInts[i].getName().equals("java.io.Serializable");
                    if (bSerializable) {
                      ByteArrayOutputStream oBOut = new ByteArrayOutputStream();
                      ObjectOutputStream oOOut = new ObjectOutputStream(oBOut);
                      oOOut.writeObject(AllValues.get(sCol));
                      oOOut.close();
                      ByteArrayInputStream oBin = new ByteArrayInputStream(oBOut.toByteArray());
                      oStream = new ObjectInputStream(oBin);                    
                    } else {
                      throw new SQLException ("Invalid object binding for column " + sCol);                      
                    }
                  } // fi
                }
                oStreams.addLast(oStream);
                oStmt.setBinaryStream(c++, oStream, ((Long)BinaryLengths.get(sCol)).intValue());
              }
              else
                oStmt.setObject (c++, null, oCol.getSqlType());
            }
            else
             oStmt.setObject (c++, null, oCol.getSqlType());
          }
          else
            oConn.bindParameter (oStmt, c++, AllValues.get(sCol), oCol.getSqlType());
          } // fi (!oPrimaryKeys.contains(sCol))
        } // wend


      oColIterator = oPrimaryKeys.listIterator();
      while (oColIterator.hasNext()) {
        sCol = (String) oColIterator.next();
        oCol = getColumnByName(sCol);


        if (DebugFile.trace) DebugFile.writeln("PreparedStatement.setObject (" + String.valueOf(c) + "," + AllValues.get(sCol) + "," + oCol.getSqlTypeName() + ")");


        oConn.bindParameter (oStmt, c, AllValues.get(sCol), oCol.getSqlType());
        c++;
      } // wend


      if (DebugFile.trace) DebugFile.writeln("PreparedStatement.executeUpdate()");


      iAffected = oStmt.executeUpdate();


      if (DebugFile.trace) DebugFile.writeln(String.valueOf(iAffected) +  " affected rows");


      oStmt.close();


      oColIterator = oStreams.listIterator();


      while (oColIterator.hasNext())
        ((InputStream) oColIterator.next()).close();


      oStreams.clear();


    }
    else
      iAffected = 0;


    if (0==iAffected)
        {
        bNewRow = true;


        if (DebugFile.trace) DebugFile.writeln("Connection.prepareStatement(" + sInsert + ")");


        oStmt = oConn.prepareStatement(sInsert);


        c = 1;
        oColIterator = oColumns.listIterator();


        while (oColIterator.hasNext()) {


          oCol  = (DBColumn)oColIterator.next();
          sCol = oCol.getName();


          if (DebugFile.trace) {
            if (null!=AllValues.get(sCol))
              DebugFile.writeln("Binding " + sCol + "=" + AllValues.get(sCol).toString());
            else
              DebugFile.writeln("Binding " + sCol + "=NULL");
          }


          if (oCol.getSqlType()==java.sql.Types.LONGVARCHAR || oCol.getSqlType()==java.sql.Types.CLOB || oCol.getSqlType()==java.sql.Types.LONGVARBINARY || oCol.getSqlType()==java.sql.Types.BLOB) {
            if (BinaryLengths.containsKey(sCol)) {
              if ( ( (Long) BinaryLengths.get(sCol)).intValue() > 0) {
                sClassName = AllValues.get(sCol).getClass().getName();
                if (sClassName.equals("java.io.File"))
                  oStream = new FileInputStream((File) AllValues.get(sCol));
                else if (sClassName.equals("[B"))
                  oStream = new ByteArrayInputStream((byte[]) AllValues.get(sCol));
                else if (sClassName.equals("[C"))
                  oStream = new StringBufferInputStream(new String((char[]) AllValues.get(sCol)));
                else {
                  Class[] aInts = AllValues.get(sCol).getClass().getInterfaces();
                  if (aInts==null) {
                    throw new SQLException ("Invalid object binding for column " + sCol);
                  } else {
                    boolean bSerializable = false;
                    for (int i=0; i<aInts.length &!bSerializable; i++)
                      bSerializable |= aInts[i].getName().equals("java.io.Serializable");
                    if (bSerializable) {
                      ByteArrayOutputStream oBOut = new ByteArrayOutputStream();
                      ObjectOutputStream oOOut = new ObjectOutputStream(oBOut);
                      oOOut.writeObject(AllValues.get(sCol));
                      oOOut.close();
                      ByteArrayInputStream oBin = new ByteArrayInputStream(oBOut.toByteArray());
                      oStream = new ObjectInputStream(oBin);                    
                    } else {
                      throw new SQLException ("Invalid object binding for column " + sCol);                      
                    }
                  } // fi
                }
                oStreams.addLast(oStream);
                oStmt.setBinaryStream(c++, oStream, ((Long) BinaryLengths.get(sCol)).intValue());
              }
              else
                oStmt.setObject(c++, null, oCol.getSqlType());
            }
            else
              oStmt.setObject(c++, null, oCol.getSqlType());
          }
          else
            oConn.bindParameter (oStmt, c++, AllValues.get(sCol), oCol.getSqlType());
        } // wend


        if (DebugFile.trace) DebugFile.writeln("PreparedStatement.executeUpdate()");


        iAffected = oStmt.executeUpdate();


        if (DebugFile.trace) DebugFile.writeln(String.valueOf(iAffected) +  " affected rows");


        oStmt.close();


        oColIterator = oStreams.listIterator();


        while (oColIterator.hasNext())
          ((InputStream) oColIterator.next()).close();


        oStreams.clear();
    }


    else

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   */


  public boolean deleteRegister(JDCConnection oConn, HashMap AllValues) throws SQLException {
    int c;
    boolean bDeleted;
    ListIterator oColIterator;
    PreparedStatement oStmt;
    Object oPK;
    DBColumn oCol;


    if (DebugFile.trace)
      {
      DebugFile.writeln("Begin DBTable.deleteRegister([Connection], {" + AllValues.toString() + "})" );
      DebugFile.incIdent();
      }


      if (sDelete==null) {
        throw new SQLException("Primary key not found", "42S12");
      }


    // Begin SQLException


      if (DebugFile.trace) DebugFile.writeln("Connection.prepareStatement(" + sDelete + ")");


      oStmt = oConn.prepareStatement(sDelete);


      c = 1;
      oColIterator = oPrimaryKeys.listIterator();


      while (oColIterator.hasNext()) {
        oPK = oColIterator.next();
        oCol = getColumnByName((String) oPK);


        if (DebugFile.trace) DebugFile.writeln("PreparedStatement.setObject(" + String.valueOf(c) + "," + AllValues.get(oPK) + "," + oCol.getSqlTypeName() + ")");


        oStmt.setObject (c++, AllValues.get(oPK), oCol.getSqlType());

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  public boolean existsRegister(JDCConnection oConn, HashMap AllValues) throws SQLException {
    int c;
    boolean bExists;
    PreparedStatement oStmt;
    ResultSet oRSet;
    ListIterator oColIterator;
    Object oPK;
    DBColumn oCol;


    if (DebugFile.trace)
      {
      DebugFile.writeln("Begin DBTable.existsRegister([Connection], {" + AllValues.toString() + "})" );
      DebugFile.incIdent();
      }


    oStmt = oConn.prepareStatement(sExists, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);


    c = 1;
    oColIterator = oPrimaryKeys.listIterator();


    while (oColIterator.hasNext()) {
      oPK = oColIterator.next();
      oCol = getColumnByName((String) oPK);


      oStmt.setObject (c++, AllValues.get(oPK), oCol.getSqlType());
    } // wend

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