Source Code Cross Referenced for AverageFunction.java in  » Database-DBMS » axion » org » axiondb » functions » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » axion » org.axiondb.functions 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: AverageFunction.java,v 1.6 2005/05/02 22:28:41 ahimanikya Exp $
003:         * =======================================================================
004:         * Copyright (c) 2003-2005 Axion Development Team.  All rights reserved.
005:         *
006:         * Redistribution and use in source and binary forms, with or without
007:         * modification, are permitted provided that the following conditions
008:         * are met:
009:         *
010:         * 1. Redistributions of source code must retain the above
011:         *    copyright notice, this list of conditions and the following
012:         *    disclaimer.
013:         *
014:         * 2. Redistributions in binary form must reproduce the above copyright
015:         *    notice, this list of conditions and the following disclaimer in
016:         *    the documentation and/or other materials provided with the
017:         *    distribution.
018:         *
019:         * 3. The names "Tigris", "Axion", nor the names of its contributors may
020:         *    not be used to endorse or promote products derived from this
021:         *    software without specific prior written permission.
022:         *
023:         * 4. Products derived from this software may not be called "Axion", nor
024:         *    may "Tigris" or "Axion" appear in their names without specific prior
025:         *    written permission.
026:         *
027:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
028:         * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
029:         * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
030:         * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
031:         * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
032:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
033:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
034:         * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
035:         * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
036:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
037:         * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
038:         * =======================================================================
039:         */
040:
041:        package org.axiondb.functions;
042:
043:        import java.math.BigDecimal;
044:
045:        import org.axiondb.AxionException;
046:        import org.axiondb.DataType;
047:        import org.axiondb.FunctionFactory;
048:        import org.axiondb.RowDecoratorIterator;
049:        import org.axiondb.Selectable;
050:        import org.axiondb.types.BigDecimalType;
051:
052:        /**
053:         * @version $Revision: 1.6 $ $Date: 2005/05/02 22:28:41 $
054:         * @author Sanjeeth Duvuru
055:         * @author Ahimanikya Satapathy
056:         */
057:        public class AverageFunction extends BaseAggregateFunction implements 
058:                AggregateFunction, FunctionFactory {
059:
060:            public AverageFunction() {
061:                super ("AVG");
062:            }
063:
064:            public ConcreteFunction makeNewInstance() {
065:                return new AverageFunction();
066:            }
067:
068:            public final DataType getDataType() {
069:                return _targetType == null ? BIG_DECIMAL_TYPE : _targetType;
070:            }
071:
072:            public final Object evaluate(RowDecoratorIterator rows)
073:                    throws AxionException {
074:                Selectable sel = getArgument(0);
075:                _targetType = sel.getDataType();
076:                setDistinct();
077:
078:                double rowCount = 0;
079:                BigDecimal sum = null;
080:                while (rows.hasNext()) {
081:                    Object val = _targetType.convert(sel.evaluate(rows.next()));
082:                    if (null != val && acceptable(val)) {
083:                        rowCount++;
084:                        sum = evaluate(sum, _targetType.toBigDecimal(val));
085:                    }
086:                }
087:
088:                if (null != sum) {
089:                    return sum.divide(new BigDecimal(rowCount),
090:                            BigDecimal.ROUND_HALF_UP);
091:                }
092:                return null;
093:            }
094:
095:            protected BigDecimal evaluate(BigDecimal src, BigDecimal val) {
096:                return null == src ? val : src.add(val);
097:            }
098:
099:            private DataType _targetType = null;
100:            private static final DataType BIG_DECIMAL_TYPE = new BigDecimalType();
101:        }
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