/*
* Copyright 2012 Rui Afonso
*
* 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.
*/
package com.googlecode.gwt.charts.client;
/**
* An interface for providing a calculated function to a DataViewColumn.
*/
public interface ColumnFunction {
/**
* A function that will be called for each row in the column to calculate a value for that cell. The function
* signature is func(dataTable, row), where dataTable is the source DataTable, and row is the index of the
* source data row. The function should return a single value of the type specified by type.
*
* @param dataTable is the source DataTable
* @param row is the index of the source data row
* @return should return a single value of the type specified by the column type
*/
public Object calc(DataTable dataTable, int row);
}