| /* |
| * 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.nifi.processors.standard.util; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.nio.charset.StandardCharsets; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| import java.util.regex.Pattern; |
| |
| import org.apache.nifi.distributed.cache.client.Deserializer; |
| import org.apache.nifi.distributed.cache.client.Serializer; |
| import org.apache.nifi.distributed.cache.client.exception.DeserializationException; |
| import org.apache.nifi.distributed.cache.client.exception.SerializationException; |
| |
| /** |
| * Offers serialization and deserialization for flow file attribute maps. |
| * |
| */ |
| public class FlowFileAttributesSerializer implements Deserializer<Map<String, String>>, Serializer<Map<String, String>> { |
| |
| private static final String ATTRIBUTE_SEPARATOR = "<|--|>"; |
| |
| @Override |
| public Map<String, String> deserialize(final byte[] input) throws DeserializationException, IOException { |
| if (input == null || input.length == 0) { |
| return null; |
| } |
| Map<String, String> attributes = new HashMap<>(); |
| |
| String attributesText = new String(input, StandardCharsets.UTF_8); |
| String[] entries = attributesText.split(Pattern.quote(ATTRIBUTE_SEPARATOR)); |
| for(String entry : entries) { |
| int equalsIndex = entry.indexOf('='); |
| String key = entry.substring(0, equalsIndex); |
| String value = entry.substring(equalsIndex + 1); |
| attributes.put(key, value); |
| } |
| |
| return attributes; |
| } |
| |
| @Override |
| public void serialize(Map<String, String> value, OutputStream output) throws SerializationException, IOException { |
| int i = 0; |
| for(Entry<String, String> entry : value.entrySet()) { |
| output.write((entry.getKey() + '=' + entry.getValue()).getBytes(StandardCharsets.UTF_8)); |
| if (i < value.size() - 1) { |
| output.write(ATTRIBUTE_SEPARATOR.getBytes(StandardCharsets.UTF_8)); |
| } |
| i++; |
| } |
| output.flush(); |
| } |
| } |