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

  public String getColumnsStr() throws IllegalStateException {


    if (null==oColumns)
      throw new IllegalStateException("Table columns list has not been initialized");


    ListIterator oColIterator = oColumns.listIterator();
    String sGetAllCols = new String("");


    while (oColIterator.hasNext())
      sGetAllCols += ((DBColumn) oColIterator.next()).getName() + ",";


    return sGetAllCols.substring(0, sGetAllCols.length()-1);


  } // getColumnsStr

View Full Code Here

  public DBColumn getColumnByName (String sColumnName) throws IllegalStateException {


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


    ListIterator oColIterator = oColumns.listIterator();
    DBColumn oCol = null;


    while (oColIterator.hasNext()) {
      oCol = (DBColumn) oColIterator.next();
      if (oCol.getName().equalsIgnoreCase(sColumnName)) {
        break;
      }
      oCol = null;
    } // wend

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   * @param sColumnName Column Name
   * @return Column Index[1..columnsCount()] or -1 if no column with such name was found.
   */


  public int getColumnIndex (String sColumnName) {
    ListIterator oColIterator = oColumns.listIterator();
    DBColumn oCol = null;


    while (oColIterator.hasNext()) {
      oCol = (DBColumn) oColIterator.next();
      if (oCol.getName().equalsIgnoreCase(sColumnName)) {
        return oCol.getPosition();
      }
      oCol = null;
    } // wend

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      ResultSet oRSet;
      ResultSetMetaData oRData;
      DBColumn oCol;
      String sCol;
      int iCols;
      ListIterator oColIterator;


      String sColName;
      short iSQLType;
      String sTypeName;
      int iPrecision;
      int iDigits;
      int iNullable;
      int iColPos;


      int iDBMS;


      String sGetAllCols = "";
      String sSetPKCols = "";
      String sSetAllCols = "";
      String sSetNoPKCols = "";


      oColumns = new LinkedList<DBColumn>();
    oIndexes = new LinkedList<DBIndex>();
      oPrimaryKeys = new LinkedList<String>();


      if (DebugFile.trace)
        {
        DebugFile.writeln("Begin DBTable.readColumns([DatabaseMetaData])" );
        DebugFile.incIdent();


        DebugFile.writeln("DatabaseMetaData.getColumns(" + sCatalog + "," + sSchema + "," + sName + ",%)");
        }


      if (oConn.getMetaData().getDatabaseProductName().equals("PostgreSQL"))
        iDBMS = JDCConnection.DBMS_POSTGRESQL;
      else if (oConn.getMetaData().getDatabaseProductName().equals("Oracle"))
        iDBMS = JDCConnection.DBMS_ORACLE;
      else if (oConn.getMetaData().getDatabaseProductName().equals("MySQL"))
        iDBMS = JDCConnection.DBMS_MYSQL;
      else if (oConn.getMetaData().getDatabaseProductName().equals("ACCESS"))
        iDBMS = JDCConnection.DBMS_ACCESS;
      else if (oConn.getMetaData().getDatabaseProductName().equals("Microsoft SQL Server"))
        iDBMS = JDCConnection.DBMS_MSSQL;
      else if (oConn.getMetaData().getDatabaseProductName().equals("SQLite"))
        iDBMS = JDCConnection.DBMS_SQLITE;
      else
        iDBMS = 0;


      oStmt = oConn.createStatement();


      try {
        if (DebugFile.trace) DebugFile.writeln("Statement.executeQuery(SELECT * FROM " + sName + " WHERE 1=0)");


        oRSet = oStmt.executeQuery("SELECT * FROM " + sName + " WHERE 1=0");
        iErrCode = 0;
      }
      catch (SQLException sqle) {
        // Patch for Oracle. DatabaseMetadata.getTables() returns table names
        // that later cannot be SELECTed, so this catch ignore these system tables


        oStmt.close();
        oRSet = null;


        if (DebugFile.trace) DebugFile.writeln("SQLException " + sName + " " + sqle.getMessage());


        iErrCode = sqle.getErrorCode();
        if (iErrCode==0) iErrCode=-1;
        if (!sqle.getSQLState().equals("42000"))
          throw new SQLException(sqle.getMessage(), sqle.getSQLState(), sqle.getErrorCode());
      }


      if (0==iErrCode) {
        if (DebugFile.trace) DebugFile.writeln("ResultSet.getMetaData()");


        oRData= oRSet.getMetaData();


        iCols = oRData.getColumnCount();


        if (DebugFile.trace) DebugFile.writeln("table has " + String.valueOf(iCols) + " columns");


        for (int c=1; c<=iCols; c++) {
          sColName = oRData.getColumnName(c).toLowerCase();
          sTypeName = oRData.getColumnTypeName(c);
          iSQLType = (short) oRData.getColumnType(c);


          if (iDBMS==JDCConnection.DBMS_POSTGRESQL)
            switch (iSQLType) {
              case Types.CHAR:
              case Types.VARCHAR:
                iPrecision = oRData.getColumnDisplaySize(c);
                break;
              default:
                iPrecision = oRData.getPrecision(c);
            }
          else {
            // New for v2.0, solves bug SF887614
            if (iSQLType==Types.BLOB || iSQLType==Types.CLOB)
              iPrecision = 2147483647;
            // end v2.0
            else
              iPrecision = oRData.getPrecision(c);
          }


          iDigits = oRData.getScale(c);
          iNullable = oRData.isNullable(c);
          iColPos = c;


          if (5==iDBMS && iSQLType==Types.NUMERIC && iPrecision<=6 && iDigits==0) {
            // Workaround for an Oracle 9i bug witch is unable to convert from Short to NUMERIC but does understand SMALLINT
            oCol = new DBColumn (sName,sColName,(short) Types.SMALLINT, sTypeName, iPrecision, iDigits, iNullable,iColPos);
          }
          else {
            oCol = new DBColumn (sName,sColName,iSQLType,sTypeName,iPrecision,iDigits,iNullable,iColPos);
          }


          // Establecer el comportamiento de no tocar en ningún caso los campos dt_created
          // quitar este if si se desea asignarlos manualmente al insertar cada registro
          if (!sColName.equals(DB.dt_created))
            oColumns.add(oCol);
        } // next


        if (DebugFile.trace) DebugFile.writeln("ResultSet.close()");


        oRSet.close();
        oRSet = null;
        oStmt.close();
        oStmt = null;


        if (5==iDBMS) /* Oracle */ {


          /* getPrimaryKeys() not working properly on some Oracle versions,
             use non portable implementation instead. Sergio 12-01-2004.


          Code until v1.1.4:


          if (DebugFile.trace)
            DebugFile.writeln("DatabaseMetaData.getPrimaryKeys(null, " + sSchema.toUpperCase() + ", " + sName.toUpperCase() + ")");


          oRSet = oMData.getPrimaryKeys(sCatalog, sSchema.toUpperCase(), sName.toUpperCase());
          */


          oStmt = oConn.createStatement();


          if (DebugFile.trace) {
            if (null==sSchema)
              DebugFile.writeln("Statement.executeQuery(SELECT NULL AS TABLE_CAT, COLS.OWNER AS TABLE_SCHEM, COLS.TABLE_NAME, COLS.COLUMN_NAME, COLS.POSITION AS KEY_SEQ, COLS.CONSTRAINT_NAME AS PK_NAME FROM USER_CONS_COLUMNS COLS, USER_CONSTRAINTS CONS WHERE CONS.OWNER=COLS.OWNER AND CONS.CONSTRAINT_NAME=COLS.CONSTRAINT_NAME AND CONS.CONSTRAINT_TYPE='P' AND CONS.TABLE_NAME='" + sName.toUpperCase()+ "')");
            else
              DebugFile.writeln("Statement.executeQuery(SELECT NULL AS TABLE_CAT, COLS.OWNER AS TABLE_SCHEM, COLS.TABLE_NAME, COLS.COLUMN_NAME, COLS.POSITION AS KEY_SEQ, COLS.CONSTRAINT_NAME AS PK_NAME FROM USER_CONS_COLUMNS COLS, USER_CONSTRAINTS CONS WHERE CONS.OWNER=COLS.OWNER AND CONS.CONSTRAINT_NAME=COLS.CONSTRAINT_NAME AND CONS.CONSTRAINT_TYPE='P' AND CONS.OWNER='" + sSchema.toUpperCase() + "' AND CONS.TABLE_NAME='" + sName.toUpperCase()+ "')");
          }


          if (null==sSchema)
            oRSet = oStmt.executeQuery("SELECT NULL AS TABLE_CAT, COLS.OWNER AS TABLE_SCHEM, COLS.TABLE_NAME, COLS.COLUMN_NAME, COLS.POSITION AS KEY_SEQ, COLS.CONSTRAINT_NAME AS PK_NAME FROM USER_CONS_COLUMNS COLS, USER_CONSTRAINTS CONS WHERE CONS.OWNER=COLS.OWNER AND CONS.CONSTRAINT_NAME=COLS.CONSTRAINT_NAME AND CONS.CONSTRAINT_TYPE='P' AND CONS.TABLE_NAME='" + sName.toUpperCase()+ "'");
          else
            oRSet = oStmt.executeQuery("SELECT NULL AS TABLE_CAT, COLS.OWNER AS TABLE_SCHEM, COLS.TABLE_NAME, COLS.COLUMN_NAME, COLS.POSITION AS KEY_SEQ, COLS.CONSTRAINT_NAME AS PK_NAME FROM USER_CONS_COLUMNS COLS, USER_CONSTRAINTS CONS WHERE CONS.OWNER=COLS.OWNER AND CONS.CONSTRAINT_NAME=COLS.CONSTRAINT_NAME AND CONS.CONSTRAINT_TYPE='P' AND CONS.OWNER='" + sSchema.toUpperCase() + "' AND CONS.TABLE_NAME='" + sName.toUpperCase()+ "'");


          // End new code v1.2.0
          }
          else if (10==iDBMS) { // Microsoft Access
            oRSet=null;
          }
          else {
            if (DebugFile.trace)
              DebugFile.writeln("DatabaseMetaData.getPrimaryKeys(" + sCatalog + "," + sSchema + "," + sName + ")");


            oRSet = oMData.getPrimaryKeys(sCatalog, sSchema, sName);
          } // fi (iDBMS)


        if (oRSet!=null) {
          while (oRSet.next()) {
            oPrimaryKeys.add(oRSet.getString(4).toLowerCase());
            sSetPKCols += oRSet.getString(4) + "=? AND ";
          } // wend


          if (DebugFile.trace) DebugFile.writeln("pk cols " + sSetPKCols);


          if (sSetPKCols.length()>7)
            sSetPKCols = sSetPKCols.substring(0, sSetPKCols.length()-5);


          if (DebugFile.trace) DebugFile.writeln("ResultSet.close()");


          oRSet.close();
          oRSet = null;
        } // fi (oRSet)


      if (null!=oStmt) { oStmt.close(); oStmt = null; }


      oColIterator = oColumns.listIterator();


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


        sGetAllCols += sCol + ",";
        sSetAllCols += "?,";


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

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   * @return <b>true</b> if a callback with such name was found and unregistered,
   * <b>false</b> otherwise
   */
  public boolean unregisterCallback(String sCallbackName) {
    WorkerThreadCallback oCallback;
    ListIterator oIter = oCallbacks.listIterator();


    while (oIter.hasNext()) {
      oCallback = (WorkerThreadCallback) oIter.next();


      if (oCallback.name().equals(sCallbackName)) {
        oIter.remove();
        iCallbacks--;
        return true;
      } // fi
    } // wend

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      DebugFile.writeln("Begin Quotation.createOrder([Connection])");
      DebugFile.incIdent();
    }
    String sSQL;
    Order oOrder = new Order();
    ListIterator oIter = oOrder.getTable(oConn).getColumns().listIterator();
    while (oIter.hasNext()) {
      String sKey = ((DBColumn) oIter.next()).getName();
      if (!isNull(sKey)) {
        if (DebugFile.trace) DebugFile.writeln("Order.put("+sKey+","+get(sKey)+")");
        oOrder.put(sKey, get(sKey));
      }
    } // wend

View Full Code Here

  // ---------------------------------------------------------------------------


  private void callBack (int iOpCode, String sMessage, Exception oXcpt, Object oParam) {


    WorkerThreadCallback oCallback;
    ListIterator oIter = oCallbacks.listIterator();


    while (oIter.hasNext()) {
      oCallback = (WorkerThreadCallback) oIter.next();
      oCallback.call(getName(), iOpCode, sMessage, oXcpt, oParam);
    } // wend


  } // callBack

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  public DBMatch[] toArray() {
  DBMatch[] aMatches = null;
  Collections.sort(oSortedList, DBMatch.COMPARATOR);
  if (count()>0) {
    aMatches = new DBMatch[count()];
    ListIterator oIter = iterator();
    int m = 0;
    while (oIter.hasNext()) aMatches[m++] = (DBMatch) oIter.next();
  } // fi
  return aMatches;
  } // toArray

View Full Code Here

  }
    
  public String toXML() {
  Collections.sort(oSortedList, DBMatch.COMPARATOR);
    StringBuffer oBuff = new StringBuffer(200*count()+1);
    ListIterator oIter = iterator();
    oBuff.append("<DBMatchSet>\n");
  while (oIter.hasNext()) {
    DBMatch oMatch = (DBMatch) oIter.next();
      oBuff.append("  <DBMatch>\n");
    oBuff.append("    <guid>"+oMatch.guid()+"</guid>\n");
    oBuff.append("    <index>"+String.valueOf(oMatch.index())+"</index>\n");
    oBuff.append("    <grade>"+String.valueOf(oMatch.grade())+"</grade>\n");
    oBuff.append("    <value><![CDATA["+oMatch.matchingValue()+"]]></value>\n");

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        } // fi
      } // next (r)


      StringBuffer oTermsBuff = new StringBuffer();
    
      ListIterator oIter = oTerms.listIterator();
      while (oIter.hasNext()) {
        Term oChld = (Term) oIter.next();


        oTermsBuff.append("<OPTION VALUE=\"" + oChld.getString(DB.gu_term) + "\">");
        for (int s=1; s<oChld.level(); s++)
          oTermsBuff.append(" ");
        oTermsBuff.append(oChld.getString(DB.tx_term));

View Full Code Here

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