| /** |
| * 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 org.apache.apex.malhar.contrib.misc.streamquery.index; |
| |
| import java.util.Map; |
| |
| import javax.validation.constraints.NotNull; |
| |
| import org.apache.apex.malhar.lib.streamquery.index.ColumnIndex; |
| |
| /** |
| * <p>An implementation of column index that implements filter method using Round Double Index. </p> |
| * |
| * @displayName Round Double Index |
| * @category Stream Manipulators |
| * @tags alias, maths |
| * @since 0.3.4 |
| * @deprecated |
| */ |
| @Deprecated |
| public class RoundDoubleIndex extends ColumnIndex |
| { |
| private int rounder; |
| public RoundDoubleIndex(@NotNull String column, String alias, int numDecimals) |
| { |
| super(column, alias); |
| rounder = 1; |
| if (numDecimals > 0) { |
| rounder = (int)Math.pow(10, numDecimals); |
| } |
| } |
| |
| @Override |
| public void filter(@NotNull Map<String, Object> row, @NotNull Map<String, Object> collect) |
| { |
| if (!row.containsKey(column)) { |
| return; |
| } |
| double value = (Double)row.get(column); |
| value = Math.round(value * rounder) / rounder; |
| String name = getColumn(); |
| if (alias != null) { |
| name = alias; |
| } |
| collect.put(name, value); |
| } |
| } |
| |