Package org.teiid.query.function.aggregate

Source Code of org.teiid.query.function.aggregate.Sum

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* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership.  Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/

package org.teiid.query.function.aggregate;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.List;

import org.teiid.api.exception.query.ExpressionEvaluationException;
import org.teiid.api.exception.query.FunctionExecutionException;
import org.teiid.core.TeiidComponentException;
import org.teiid.core.types.DataTypeManager;


/**
* Accumulates (per tuple) and calculates the sum of the values
* of a column.  The type of the result varies depending on the type
* of the input {@see AggregateSymbol}
*/
public class Sum extends AggregateFunction {

    // Various possible accumulators, depending on type
    protected static final int LONG = 0;
    protected static final int DOUBLE = 1;
    protected static final int BIG_INTEGER = 2;
    protected static final int BIG_DECIMAL = 3;
   
    protected int accumulatorType = LONG;
   
    private Object sum = null;

    /**
     * Allows subclasses to determine type of accumulator for the SUM.
     * @return Type, as defined in constants
     */   
    protected int getAccumulatorType() {
        return this.accumulatorType;
    }

    /**
     * @see org.teiid.query.function.aggregate.AggregateFunction#initialize(boolean, String)
     */
    public void initialize(Class<?> dataType, Class<?> inputType) {
        if(dataType.equals(DataTypeManager.DefaultDataClasses.LONG)) {
                   
            this.accumulatorType = LONG;   
           
        } else if(dataType.equals(DataTypeManager.DefaultDataClasses.DOUBLE)) {
       
            this.accumulatorType = DOUBLE;

        } else if(dataType.equals(DataTypeManager.DefaultDataClasses.BIG_INTEGER)) {
       
            this.accumulatorType = BIG_INTEGER;
        } else {
            this.accumulatorType = BIG_DECIMAL;
        }
    }
   
    public void reset() {
        sum = null;
    }

    /**
     * @see org.teiid.query.function.aggregate.AggregateFunction#addInputDirect(Object, List)
     */
    public void addInputDirect(Object input, List<?> tuple)
        throws FunctionExecutionException, ExpressionEvaluationException, TeiidComponentException {
       
        if (this.sum == null) {
            switch (this.accumulatorType) {
                case LONG:
                    this.sum = new Long(0);
                    break;
                case DOUBLE:
                    this.sum = new Double(0);
                    break;
                case BIG_INTEGER:
                    this.sum = new BigInteger(String.valueOf(0));
                    break;
                case BIG_DECIMAL:
                    this.sum = new BigDecimal(0);
                    break;
            }
        }
           
        switch(this.accumulatorType) {       
            case LONG:
                this.sum = new Long(((Long)this.sum).longValue() + ((Number)input).longValue());
                break;
            case DOUBLE:
                this.sum = new Double(((Double)this.sum).doubleValue() + ((Number)input).doubleValue());
                break;
            case BIG_INTEGER:
                this.sum = ((BigInteger)this.sum).add( (BigInteger) input );
                break;
            case BIG_DECIMAL:
                if (input instanceof BigInteger) {
                    BigInteger bigIntegerInput = (BigInteger) input;
                    this.sum = ((BigDecimal)this.sum).add( new BigDecimal(bigIntegerInput) );
                } else {
                    this.sum = ((BigDecimal)this.sum).add( (BigDecimal) input );
                }
                break;   
        }
    }

    /**
     * @see org.teiid.query.function.aggregate.AggregateFunction#getResult()
     */
    public Object getResult()
        throws FunctionExecutionException, ExpressionEvaluationException, TeiidComponentException {
       
        return sum;       
    }
}
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