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RowDataStatic.java

/*
 Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
 

  The MySQL Connector/J is licensed under the terms of the GPLv2
  <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
  There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
  this software, see the FLOSS License Exception
  <http://www.mysql.com/about/legal/licensing/foss-exception.html>.

  This program is free software; you can redistribute it and/or modify it under the terms
  of the GNU General Public License as published by the Free Software Foundation; version 2
  of the License.

  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU General Public License for more details.

  You should have received a copy of the GNU General Public License along with this
  program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
  Floor, Boston, MA 02110-1301  USA



 */
package com.mysql.jdbc;

import java.sql.SQLException;
import java.util.List;

/**
 * Represents an in-memory result set
 * 
 * @author dgan
 * @version $Id$
 */
00037 public class RowDataStatic implements RowData {
      private Field[] metadata;
      
      private int index;

      ResultSetImpl owner;

      private List rows;

      /**
       * Creates a new RowDataStatic object.
       * 
       * @param rows
       *            DOCUMENT ME!
       */
00052       public RowDataStatic(List rows) {
            this.index = -1;
            this.rows = rows;
      }

      /**
       * DOCUMENT ME!
       * 
       * @param row
       *            DOCUMENT ME!
       */
00063       public void addRow(ResultSetRow row) {
            this.rows.add(row);
      }

      /**
       * Moves to after last.
       */
00070       public void afterLast() {
            this.index = this.rows.size();
      }

      /**
       * Moves to before first.
       */
00077       public void beforeFirst() {
            this.index = -1;
      }

      /**
       * DOCUMENT ME!
       */
00084       public void beforeLast() {
            this.index = this.rows.size() - 2;
      }

      /**
       * DOCUMENT ME!
       */
00091       public void close() {
      }

      /**
       * DOCUMENT ME!
       * 
       * @param atIndex
       *            DOCUMENT ME!
       * 
       * @return DOCUMENT ME!
       */
00102       public ResultSetRow getAt(int atIndex) throws SQLException {
            if ((atIndex < 0) || (atIndex >= this.rows.size())) {
                  return null;
            }

            return ((ResultSetRow) this.rows.get(atIndex)).setMetadata(this.metadata);
      }

      /**
       * DOCUMENT ME!
       * 
       * @return DOCUMENT ME!
       */
00115       public int getCurrentRowNumber() {
            return this.index;
      }

      /**
       * @see com.mysql.jdbc.RowData#getOwner()
       */
00122       public ResultSetInternalMethods getOwner() {
            return this.owner;
      }

      /**
       * DOCUMENT ME!
       * 
       * @return DOCUMENT ME!
       */
00131       public boolean hasNext() {
            boolean hasMore = (this.index + 1) < this.rows.size();

            return hasMore;
      }

      /**
       * Returns true if we got the last element.
       * 
       * @return DOCUMENT ME!
       */
00142       public boolean isAfterLast() {
            return this.index >= this.rows.size();
      }

      /**
       * Returns if iteration has not occured yet.
       * 
       * @return DOCUMENT ME!
       */
00151       public boolean isBeforeFirst() {
            return (this.index == -1) && (this.rows.size() != 0);
      }

      /**
       * DOCUMENT ME!
       * 
       * @return DOCUMENT ME!
       */
00160       public boolean isDynamic() {
            return false;
      }

      /**
       * DOCUMENT ME!
       * 
       * @return DOCUMENT ME!
       */
00169       public boolean isEmpty() {
            return this.rows.size() == 0;
      }

      /**
       * DOCUMENT ME!
       * 
       * @return DOCUMENT ME!
       */
00178       public boolean isFirst() {
            return this.index == 0;
      }

      /**
       * DOCUMENT ME!
       * 
       * @return DOCUMENT ME!
       */
00187       public boolean isLast() {
            //
            // You can never be on the 'last' row of
            // an empty result set
            //
            if (this.rows.size() == 0) {
                  return false;
            }

            return (this.index == (this.rows.size() - 1));
      }

      /**
       * DOCUMENT ME!
       * 
       * @param rows
       *            DOCUMENT ME!
       */
00205       public void moveRowRelative(int rowsToMove) {
            this.index += rowsToMove;
      }

      /**
       * DOCUMENT ME!
       * 
       * @return DOCUMENT ME!
       */
00214       public ResultSetRow next() throws SQLException {
            this.index++;

            if (this.index < this.rows.size()) {
                  ResultSetRow row = (ResultSetRow) this.rows.get(this.index);
                  
                  return row.setMetadata(this.metadata);
            }

            return null;
      }

      /**
       * DOCUMENT ME!
       * 
       * @param atIndex
       *            DOCUMENT ME!
       */
00232       public void removeRow(int atIndex) {
            this.rows.remove(atIndex);
      }

      /**
       * DOCUMENT ME!
       * 
       * @param newIndex
       *            DOCUMENT ME!
       */
00242       public void setCurrentRow(int newIndex) {
            this.index = newIndex;
      }

      /**
       * @see com.mysql.jdbc.RowData#setOwner(com.mysql.jdbc.ResultSetInternalMethods)
       */
00249       public void setOwner(ResultSetImpl rs) {
            this.owner = rs;
      }

      /**
       * DOCUMENT ME!
       * 
       * @return DOCUMENT ME!
       */
00258       public int size() {
            return this.rows.size();
      }

00262       public boolean wasEmpty() {
            return (this.rows != null && this.rows.size() == 0);
      }

00266       public void setMetadata(Field[] metadata) {
            this.metadata = metadata;
      }
}

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