////////////////////////////////////////////////////////////////////////////////
//
// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You 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.
//
////////////////////////////////////////////////////////////////////////////////
package mx.collections
{
/**
* The DefaultSummaryCalculator class provides summary calculation logic for
* SUM
, MIN
, MAX
, AVG
, and COUNT
operations.
*
* @see mx.collections.SummaryField2
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 4
*/
public class DefaultSummaryCalculator implements ISummaryCalculator
{
//--------------------------------------------------------------------------
//
// Methods
//
//--------------------------------------------------------------------------
/**
* @inheritDoc
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 4
*/
public function summaryCalculationBegin(field:SummaryField2):Object
{
var dataField:String = field.dataField;
var newObj:Object = {};
switch (field.summaryOperation)
{
case "SUM": newObj[dataField] = 0;
break;
case "MIN": newObj[dataField] = Number.MAX_VALUE;
break;
case "MAX": newObj[dataField] = -Number.MAX_VALUE;
break;
case "COUNT": newObj[dataField] = [];
newObj[dataField + "Counter"] = 0;
break;
case "AVG": newObj[dataField] = 0;
newObj[dataField + "Count"] = 0;
break;
}
return newObj;
}
/**
* @inheritDoc
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 4
*/
public function calculateSummary(data:Object, field:SummaryField2, rowData:Object):void
{
var dataField:String = field.dataField;
var value:Number = rowData[dataField];
if (typeof(value) == "xml")
value = Number(value.toString());
switch (field.summaryOperation)
{
case "SUM": if (!data.hasOwnProperty(dataField))
data[dataField] = value ;
else
data[dataField] += value;
break;
case "MIN": if (!data.hasOwnProperty(dataField))
data[dataField] = value;
else
data[dataField] = data[dataField] < value ? data[dataField] : value;
break;
case "MAX": if (!data.hasOwnProperty(dataField))
data[dataField] = value;
else
data[dataField] = data[dataField] > value ? data[dataField] : value;
break;
case "COUNT": if (!data.hasOwnProperty(dataField))
{
data[dataField] = [rowData[dataField]];
data[dataField + "Counter"] = 1;
}
else
{
data[dataField].push(rowData[dataField]);
data[dataField + "Counter"] = data[dataField + "Counter"] + 1;
}
break;
case "AVG": if (!data.hasOwnProperty(dataField))
{
data[dataField] = value;
data[dataField + "Count"] = 1;
}
else
{
data[dataField] += value;
data[dataField + "Count"] = data[dataField + "Count"] + 1;
}
break;
}
}
/**
* @inheritDoc
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 4
*/
public function returnSummary(data:Object, field:SummaryField2):Number
{
var summary:Number = 0;
var dataField:String = field.dataField;
switch (field.summaryOperation)
{
case "SUM":
case "MIN":
case "MAX": summary = data[dataField];
break;
case "COUNT": summary = data[dataField + "Counter"];
break;
case "AVG": summary = data[dataField]/data[dataField + "Count"];
break;
}
return summary;
}
/**
* @inheritDoc
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 4
*/
public function summaryOfSummaryCalculationBegin(value:Object, field:SummaryField2):Object
{
var newObj:Object = {};
for (var p:String in value)
{
newObj[p] = value[p];
}
return newObj;
}
/**
* @inheritDoc
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 4
*/
public function calculateSummaryOfSummary(oldValue:Object, newValue:Object, field:SummaryField2):void
{
var p:String;
switch (field.summaryOperation)
{
case "AVG":
case "SUM": for (p in newValue)
{
oldValue[p] += newValue[p];
}
break;
case "MIN": for (p in newValue)
{
oldValue[p] = oldValue[p] < newValue[p] ? oldValue[p] : newValue[p];
}
break;
case "MAX": for (p in newValue)
{
oldValue[p] = oldValue[p] > newValue[p] ? oldValue[p] : newValue[p];
}
break;
case "COUNT": for (p in newValue)
{
if (oldValue[p] is Array)
oldValue[p] = oldValue[p].concat(newValue[p]);
else
oldValue[p] += newValue[p];
}
break;
}
}
/**
* @inheritDoc
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 4
*/
public function returnSummaryOfSummary(oldValue:Object, field:SummaryField2):Number
{
var summary:Number = 0;
var dataField:String = field.dataField;
switch (field.summaryOperation)
{
case "SUM":
case "MIN":
case "MAX": summary = oldValue[dataField];
break;
case "COUNT": summary = oldValue[dataField + "Counter"];
break;
case "AVG": summary = oldValue[dataField]/oldValue[dataField + "Count"];
break;
}
return summary;
}
}
}