| /** |
| * 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.Null; |
| |
| |
| /** |
| * An implementation of Unary Expression that implements filter method using negate metric sql semantic on column value. |
| * <p> |
| * @displayName Negate Expression |
| * @category Stream Manipulators |
| * @tags expression, alias |
| * @since 0.3.4 |
| * @deprecated |
| */ |
| @Deprecated |
| public class NegateExpression extends UnaryExpression |
| { |
| |
| /** |
| * @param column Name of column value to be negated. |
| */ |
| public NegateExpression(@Null String column, String alias) |
| { |
| super(column, alias); |
| if (this.alias == null) { |
| this.alias = "NEGATE(" + column + ")"; |
| } |
| } |
| |
| /* (non-Javadoc) |
| * @see com.datatorrent.lib.streamquery.index.Index#filter(java.util.Map, java.util.Map) |
| */ |
| @Override |
| public void filter(Map<String, Object> row, Map<String, Object> collect) |
| { |
| if (!row.containsKey(column)) { |
| return; |
| } |
| collect.put(alias, -((Number)row.get(column)).doubleValue()); |
| } |
| } |