/*
*
* * Copyright 2014 Orient Technologies LTD (info(at)orientechnologies.com)
* *
* * Licensed under the Apache License, Version 2.0 (the "License");
* * you may not use this file except in compliance with the License.
* * You may obtain a copy of the License at
* *
* * http://www.apache.org/licenses/LICENSE-2.0
* *
* * Unless required by applicable law or agreed to in writing, software
* * distributed under the License is distributed on an "AS IS" BASIS,
* * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* * See the License for the specific language governing permissions and
* * limitations under the License.
* *
* * For more information: http://www.orientechnologies.com
*
*/
package com.orientechnologies.orient.core.sql.functions.math;
import com.orientechnologies.common.collection.OMultiValue;
import com.orientechnologies.orient.core.command.OCommandContext;
import com.orientechnologies.orient.core.db.record.OIdentifiable;
import com.orientechnologies.orient.core.metadata.schema.OType;
import java.util.List;
/**
* Computes the sum of field. Uses the context to save the last sum number. When different Number class are used, take the class
* with most precision.
*
* @author Luca Garulli (l.garulli--at--orientechnologies.com)
*
*/
public class OSQLFunctionSum extends OSQLFunctionMathAbstract {
public static final String NAME = "sum";
private Number sum;
public OSQLFunctionSum() {
super(NAME, 1, -1);
}
public Object execute(Object iThis, final OIdentifiable iCurrentRecord, Object iCurrentResult, final Object[] iParams,
OCommandContext iContext) {
if (iParams.length == 1) {
if (iParams[0] instanceof Number)
sum((Number) iParams[0]);
else if (OMultiValue.isMultiValue(iParams[0]))
for (Object n : OMultiValue.getMultiValueIterable(iParams[0]))
sum((Number) n);
} else {
sum = null;
for (int i = 0; i < iParams.length; ++i)
sum((Number) iParams[i]);
}
return sum;
}
protected void sum(final Number value) {
if (value != null) {
if (sum == null)
// FIRST TIME
sum = value;
else
sum = OType.increment(sum, value);
}
}
@Override
public boolean aggregateResults() {
return configuredParameters.length == 1;
}
public String getSyntax() {
return "sum(<field> [,<field>*])";
}
@Override
public Object getResult() {
return sum;
}
@Override
public Object mergeDistributedResult(List<Object> resultsToMerge) {
Number sum = null;
for (Object iParameter : resultsToMerge) {
final Number value = (Number) iParameter;
if (value != null) {
if (sum == null)
// FIRST TIME
sum = value;
else
sum = OType.increment(sum, value);
}
}
return sum;
}
}