| /* |
| * Copyright (c) 2013 DataTorrent, Inc. ALL Rights Reserved. |
| * |
| * 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.datatorrent.lib.algo; |
| |
| import java.util.Map; |
| |
| import com.datatorrent.api.DefaultInputPort; |
| import com.datatorrent.api.DefaultOutputPort; |
| import com.datatorrent.api.annotation.OperatorAnnotation; |
| |
| import com.datatorrent.lib.util.BaseMatchOperator; |
| import com.datatorrent.lib.util.UnifierBooleanOr; |
| |
| /** |
| * This operator filters the incoming stream of key value pairs by obtaining the values corresponding to a specified key, |
| * and comparing those values to a specified number. |
| * If the comparison returns true for any of the key value pairs within a window, |
| * then a true is emitted at the end of the window. Otherwise a false is emitted at the end of the window. |
| * <p> |
| * Each tuple is tested for the compare function. The function is given by |
| * "key", "value", and "compare". If any tuple passes a Boolean(true) is emitted, else a Boolean(false) is emitted on the output port "any". |
| * The comparison is done by getting double value from the Number. |
| * </p> |
| * <p> |
| * This module is a pass through as it emits the moment the condition is met<br> |
| * <br> |
| * <b>StateFull : Yes, </b> tuple are compared across application window(s). <br> |
| * <b>Partitions : Yes, </b> match status is unified on output port. <br> |
| * <br> |
| * <b>Ports</b>:<br> |
| * <b>data</b>: expects Map<K,String><br> |
| * <b>any</b>: emits Boolean<br> |
| * <br> |
| * <b>Properties</b>:<br> |
| * <b>key</b>: The key on which compare is done<br> |
| * <b>value</b>: The value to compare with<br> |
| * <b>cmp</b>: The compare function. Supported values are "lte", "lt", "eq", "neq", "gt", "gte". Default is "eq"<br> |
| * <br> |
| * <b>Specific compile time checks</b>:<br> |
| * Key must be non empty<br> |
| * Value must be able to convert to a "double"<br> |
| * Compare string, if specified, must be one of "lte", "lt", "eq", "neq", "gt", "gte"<br> |
| * <br> |
| * </p> |
| * |
| * @displayName Emit Boolean For Match (String) |
| * @category Algorithmic |
| * @tags filter, key value, string |
| * |
| * @since 0.3.2 |
| */ |
| |
| @OperatorAnnotation(partitionable = true) |
| public class MatchAnyStringMap<K> extends BaseMatchOperator<K, String> |
| { |
| /** |
| * The input port which receives key value pairs. |
| */ |
| public final transient DefaultInputPort<Map<K, String>> data = new DefaultInputPort<Map<K, String>>() |
| { |
| /** |
| * Emits true on first matching tuple |
| */ |
| @Override |
| public void process(Map<K, String> tuple) |
| { |
| if (result) { |
| return; |
| } |
| String val = tuple.get(getKey()); |
| if (val == null) { // skip if key does not exist |
| return; |
| } |
| double tvalue = 0; |
| boolean errortuple = false; |
| try { |
| tvalue = Double.parseDouble(val); |
| } |
| catch (NumberFormatException e) { |
| errortuple = true; |
| } |
| result = !errortuple && compareValue(tvalue); |
| if (result) { |
| any.emit(true); |
| } |
| } |
| }; |
| /** |
| * The output port that emits true at the end of an application window if any tuple satisfies the comparison. |
| */ |
| public final transient DefaultOutputPort<Boolean> any = new DefaultOutputPort<Boolean>() |
| { |
| @Override |
| public Unifier<Boolean> getUnifier() |
| { |
| return new UnifierBooleanOr(); |
| } |
| }; |
| protected boolean result = false; |
| |
| /** |
| * Resets match flag |
| * @param windowId |
| */ |
| @Override |
| public void beginWindow(long windowId) |
| { |
| result = false; |
| } |
| } |