/*
* JBoss, Home of Professional Open Source.
* 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.Arrays;
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;
import org.teiid.query.function.FunctionMethods;
import org.teiid.query.util.CommandContext;
/**
* 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 SingleArgumentAggregateFunction {
// 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 long sumLong;
private double sumDouble;
private BigDecimal sumBigDecimal;
private boolean isNull = true;
/**
* 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() {
sumLong = 0;
sumDouble = 0;
sumBigDecimal = null;
isNull = true;
}
/**
* @see org.teiid.query.function.aggregate.AggregateFunction#addInputDirect(List, CommandContext, CommandContext)
*/
public void addInputDirect(Object input, List<?> tuple, CommandContext commandContext)
throws FunctionExecutionException, ExpressionEvaluationException, TeiidComponentException {
isNull = false;
switch(this.accumulatorType) {
case LONG:
this.sumLong = FunctionMethods.plus(this.sumLong, ((Number)input).longValue());
break;
case DOUBLE:
this.sumDouble += ((Number)input).doubleValue();
break;
case BIG_INTEGER:
case BIG_DECIMAL:
if (sumBigDecimal == null) {
sumBigDecimal = BigDecimal.valueOf(0);
}
if (input instanceof BigInteger) {
BigInteger bigIntegerInput = (BigInteger) input;
this.sumBigDecimal = this.sumBigDecimal.add( new BigDecimal(bigIntegerInput) );
} else if (input instanceof BigDecimal){
this.sumBigDecimal = this.sumBigDecimal.add( (BigDecimal) input );
} else {
this.sumBigDecimal = this.sumBigDecimal.add( new BigDecimal(((Number)input).longValue()));
}
break;
}
}
/**
* @see org.teiid.query.function.aggregate.AggregateFunction#getResult(CommandContext)
*/
public Object getResult(CommandContext commandContext)
throws FunctionExecutionException, ExpressionEvaluationException, TeiidComponentException {
if (isNull){
return null;
}
switch(this.accumulatorType) {
case LONG:
return this.sumLong;
case DOUBLE:
return this.sumDouble;
case BIG_INTEGER:
return this.sumBigDecimal.toBigInteger();
}
return this.sumBigDecimal;
}
@Override
public void getState(List<Object> state) {
switch (this.accumulatorType) {
case LONG:
if (isNull) {
state.add(null);
} else {
state.add(sumLong);
}
break;
case DOUBLE:
if (isNull) {
state.add(null);
} else {
state.add(sumDouble);
}
break;
default:
state.add(sumBigDecimal);
break;
}
}
@Override
public List<? extends Class<?>> getStateTypes() {
switch (this.accumulatorType) {
case LONG:
return Arrays.asList(Long.class);
case DOUBLE:
return Arrays.asList(Double.class);
default:
return Arrays.asList(BigDecimal.class);
}
}
public int setState(java.util.List<?> state, int index) {
switch (this.accumulatorType) {
case LONG:
{
Long val = (Long)state.get(index);
if (val == null) {
isNull = true;
sumLong = 0;
} else {
isNull = false;
sumLong = val;
}
break;
}
case DOUBLE:
{
Double val = (Double)state.get(index);
if (val == null) {
isNull = true;
sumDouble = 0;
} else {
isNull = false;
sumDouble = val;
}
break;
}
default:
this.sumBigDecimal = (BigDecimal)state.get(index);
if (this.sumBigDecimal != null) {
isNull = false;
}
break;
}
return index + 1;
}
}