Java tutorial
/** * Copyright 2015 StreamSets Inc. * * Licensed under 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 com.streamsets.pipeline.kafka.common; import com.streamsets.pipeline.api.Field; import com.streamsets.pipeline.api.OnRecordError; import com.streamsets.pipeline.api.Record; import com.streamsets.pipeline.api.ext.ContextExtensions; import com.streamsets.pipeline.api.ext.RecordWriter; import com.streamsets.pipeline.api.impl.Utils; import com.streamsets.pipeline.lib.json.StreamingJsonParser; import com.streamsets.pipeline.sdk.ContextInfoCreator; import com.streamsets.pipeline.sdk.RecordCreator; import kafka.admin.AdminUtils; import kafka.consumer.Consumer; import kafka.consumer.ConsumerConfig; import kafka.consumer.KafkaStream; import kafka.javaapi.consumer.ConsumerConnector; import kafka.javaapi.producer.Producer; import kafka.producer.KeyedMessage; import kafka.producer.ProducerConfig; import kafka.server.KafkaConfig; import kafka.server.KafkaServer; import kafka.utils.MockTime; import kafka.utils.TestUtils; import kafka.utils.TestZKUtils; import kafka.utils.ZKStringSerializer$; import kafka.zk.EmbeddedZookeeper; import org.I0Itec.zkclient.ZkClient; import org.apache.commons.csv.CSVFormat; import org.apache.commons.csv.CSVPrinter; import org.apache.commons.io.IOUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.io.BufferedReader; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileReader; import java.io.IOException; import java.io.StringWriter; import java.util.ArrayList; import java.util.Collections; import java.util.HashMap; import java.util.LinkedHashMap; import java.util.List; import java.util.Map; import java.util.Properties; public class KafkaTestUtil { private static final String MIME = "text/plain"; private static final String TEST_STRING = "Hello World"; public static final String DATE_LEVEL_CLASS = "2015-03-24 17:49:16,808 ERROR ExceptionToHttpErrorProvider - "; public static final String ERROR_MSG_WITH_STACK_TRACE = "REST API call error: LOG_PARSER_01 - Error parsing log line '2015-03-24 12:38:05,206 DEBUG LogConfigurator - Log starting, from configuration: /Users/harikiran/Documents/workspace/streamsets/dev/dist/target/streamsets-datacollector-1.0.0b2-SNAPSHOT/streamsets-datacollector-1.0.0b2-SNAPSHOT/etc/log4j.properties', reason : 'LOG_PARSER_03 - Log line 2015-03-24 12:38:05,206 DEBUG LogConfigurator - Log starting, from configuration: /Users/harikiran/Documents/workspace/streamsets/dev/dist/target/streamsets-datacollector-1.0.0b2-SNAPSHOT/streamsets-datacollector-1.0.0b2-SNAPSHOT/etc/log4j.properties does not confirm to Log4j Log Format'\n" + "com.streamsets.pipeline.lib.parser.DataParserException: LOG_PARSER_01 - Error parsing log line '2015-03-24 12:38:05,206 DEBUG LogConfigurator - Log starting, from configuration: /Users/harikiran/Documents/workspace/streamsets/dev/dist/target/streamsets-datacollector-1.0.0b2-SNAPSHOT/streamsets-datacollector-1.0.0b2-SNAPSHOT/etc/log4j.properties', reason : 'LOG_PARSER_03 - Log line 2015-03-24 12:38:05,206 DEBUG LogConfigurator - Log starting, from configuration: /Users/harikiran/Documents/workspace/streamsets/dev/dist/target/streamsets-datacollector-1.0.0b2-SNAPSHOT/streamsets-datacollector-1.0.0b2-SNAPSHOT/etc/log4j.properties does not confirm to Log4j Log Format'\n" + "\tat com.streamsets.pipeline.lib.parser.log.LogDataParser.parse(LogDataParser.java:69)\n" + "\tat com.streamsets.pipeline.stage.origin.spooldir.SpoolDirSource.produce(SpoolDirSource.java:566)\n" + "\tat com.streamsets.pipeline.stage.origin.spooldir.SpoolDirSource.produce(SpoolDirSource.java:535)\n" + "\tat com.streamsets.pipeline.configurablestage.DSource.produce(DSource.java:24)\n" + "\tat com.streamsets.pipeline.runner.StageRuntime.execute(StageRuntime.java:149)\n" + "\tat com.streamsets.pipeline.runner.StagePipe.process(StagePipe.java:106)\n" + "\tat com.streamsets.pipeline.runner.preview.PreviewPipelineRunner.run(PreviewPipelineRunner.java:85)\n" + "\tat com.streamsets.pipeline.runner.Pipeline.run(Pipeline.java:98)\n" + "\tat com.streamsets.pipeline.runner.preview.PreviewPipeline.run(PreviewPipeline.java:38)\n" + "\tat com.streamsets.pipeline.restapi.PreviewResource.previewWithOverride(PreviewResource.java:105)\n" + "\tat sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)\n" + "\tat sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)\n" + "\tat sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\n" + "\tat java.lang.reflect.Method.invoke(Method.java:606)\n" + "\tat org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81)\n" + "\tat org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:151)\n" + "\tat org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:171)\n" + "\tat org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:152)\n" + "\tat org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:104)\n" + "\tat org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:384)\n" + "\tat org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:342)\n" + "\tat org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:101)\n" + "\tat org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:271)\n" + "\tat org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)\n" + "\tat org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)\n" + "\tat org.glassfish.jersey.internal.Errors.process(Errors.java:315)\n" + "\tat org.glassfish.jersey.internal.Errors.process(Errors.java:297)\n" + "\tat org.glassfish.jersey.internal.Errors.process(Errors.java:267)\n" + "\tat org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:297)\n" + "\tat org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:254)\n" + "\tat org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1030)\n" + "\tat org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:373)\n" + "\tat org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:381)\n" + "\tat org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:344)\n" + "\tat org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:221)\n" + "\tat org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:769)\n" + "\tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1667)\n" + "\tat com.streamsets.pipeline.http.LocaleDetectorFilter.doFilter(LocaleDetectorFilter.java:29)\n" + "\tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)\n" + "\tat org.eclipse.jetty.servlets.UserAgentFilter.doFilter(UserAgentFilter.java:83)\n" + "\tat org.eclipse.jetty.servlets.GzipFilter.doFilter(GzipFilter.java:300)\n" + "\tat org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)\n" + "\tat org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:583)\n" + "\tat org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)\n" + "\tat org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:542)\n" + "\tat org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)\n" + "\tat org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1125)\n" + "\tat org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)\n" + "\tat org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)\n" + "\tat org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1059)\n" + "\tat org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)\n" + "\tat org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)\n" + "\tat org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:309)\n" + "\tat org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)\n" + "\tat org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)\n" + "\tat org.eclipse.jetty.server.Server.handle(Server.java:497)\n" + "\tat org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)\n" + "\tat org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:248)\n" + "\tat org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)\n" + "\tat org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:610)\n" + "\tat org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:539)\n" + "\tat java.lang.Thread.run(Thread.java:745)\n" + "Caused by: com.streamsets.pipeline.lib.parser.DataParserException: LOG_PARSER_03 - Log line 2015-03-24 12:38:05,206 DEBUG LogConfigurator - Log starting, from configuration: /Users/harikiran/Documents/workspace/streamsets/dev/dist/target/streamsets-datacollector-1.0.0b2-SNAPSHOT/streamsets-datacollector-1.0.0b2-SNAPSHOT/etc/log4j.properties does not confirm to Log4j Log Format\n" + "\tat com.streamsets.pipeline.lib.parser.log.Log4jParser.handleNoMatch(Log4jParser.java:30)\n" + "\tat com.streamsets.pipeline.lib.parser.log.GrokParser.parseLogLine(GrokParser.java:51)\n" + "\tat com.streamsets.pipeline.lib.parser.log.LogDataParser.parse(LogDataParser.java:67)\n" + "\t... 61 more"; public static final String LOG_LINE_WITH_STACK_TRACE = DATE_LEVEL_CLASS + ERROR_MSG_WITH_STACK_TRACE; public static final String LOG_LINE = "2015-03-20 15:53:31,161 DEBUG PipelineConfigurationValidator - " + "Pipeline 'test:preview' validation. valid=true, canPreview=true, issuesCount=0"; public static final String TEST_STRING_255 = "StreamSets was founded in June 2014 by business and engineering " + "leaders in the data integration space with a history of bringing successful products to market. Were a " + "team that is laser-focused on solving hard problems so our customers dont have to."; private static final Logger LOG = LoggerFactory.getLogger(KafkaTestUtil.class); private static final long TIME_OUT = 5000; private static ZkClient zkClient; private static List<KafkaServer> kafkaServers; private static Map<String, String> kafkaProps; private static String metadataBrokerURI; private static String zkConnect; private static EmbeddedZookeeper zkServer; public KafkaTestUtil() { } public static String getMetadataBrokerURI() { return metadataBrokerURI; } public static String getZkConnect() { return zkConnect; } public static List<KafkaServer> getKafkaServers() { return kafkaServers; } public static EmbeddedZookeeper getZkServer() { return zkServer; } public static void startZookeeper() { zkConnect = TestZKUtils.zookeeperConnect(); try { zkServer = new EmbeddedZookeeper(zkConnect); } catch (Exception ex) { String msg = Utils.format("Error starting zookeeper {}: {}", zkConnect, ex); throw new RuntimeException(msg, ex); } zkClient = new ZkClient(zkServer.connectString(), 30000, 30000, ZKStringSerializer$.MODULE$); } public static void startKafkaBrokers(int numberOfBrokers) { kafkaServers = new ArrayList<>(numberOfBrokers); kafkaProps = new HashMap<>(); // setup Broker StringBuilder sb = new StringBuilder(); for (int i = 0; i < numberOfBrokers; i++) { int port = TestUtils.choosePort(); Properties props = TestUtils.createBrokerConfig(i, port); props.put("auto.create.topics.enable", "false"); kafkaServers.add(TestUtils.createServer(new KafkaConfig(props), new MockTime())); sb.append("localhost:" + port).append(","); } metadataBrokerURI = sb.deleteCharAt(sb.length() - 1).toString(); LOG.info("Setting metadataBrokerList and auto.offset.reset for test case"); kafkaProps.put("auto.offset.reset", "smallest"); } public static void createTopic(String topic, int partitions, int replicationFactor) { AdminUtils.createTopic(zkClient, topic, partitions, replicationFactor, new Properties()); TestUtils.waitUntilMetadataIsPropagated(scala.collection.JavaConversions.asScalaBuffer(kafkaServers), topic, 0, TIME_OUT); } public static void shutdown() { for (KafkaServer kafkaServer : kafkaServers) { kafkaServer.shutdown(); } zkClient.close(); zkServer.shutdown(); metadataBrokerURI = null; zkConnect = null; kafkaProps = null; } public static List<KafkaStream<byte[], byte[]>> createKafkaStream(String zookeeperConnectString, String topic, int partitions) { //create consumer Properties consumerProps = new Properties(); consumerProps.put("zookeeper.connect", zookeeperConnectString); consumerProps.put("group.id", "testClient"); consumerProps.put("zookeeper.session.timeout.ms", "6000"); consumerProps.put("zookeeper.sync.time.ms", "200"); consumerProps.put("auto.commit.interval.ms", "1000"); consumerProps.put("consumer.timeout.ms", "500"); ConsumerConfig consumerConfig = new ConsumerConfig(consumerProps); ConsumerConnector consumer = Consumer.createJavaConsumerConnector(consumerConfig); Map<String, Integer> topicCountMap = new HashMap<>(); topicCountMap.put(topic, partitions); Map<String, List<KafkaStream<byte[], byte[]>>> consumerMap = consumer.createMessageStreams(topicCountMap); return consumerMap.get(topic); } public static Producer<String, String> createProducer(String metadataBrokerURI, boolean setPartitioner) { Properties props = new Properties(); props.put("metadata.broker.list", metadataBrokerURI); props.put("serializer.class", "kafka.serializer.StringEncoder"); if (setPartitioner) { props.put("partitioner.class", "com.streamsets.pipeline.kafka.impl.ExpressionPartitioner"); } props.put("request.required.acks", "1"); ProducerConfig config = new ProducerConfig(props); Producer<String, String> producer = new Producer<>(config); return producer; } public static List<Record> createEmptyLogRecords() { return Collections.emptyList(); } public static List<Record> createStringRecords() { List<Record> records = new ArrayList<>(9); for (int i = 0; i < 9; i++) { Record r = RecordCreator.create("s", "s:1", (TEST_STRING + i).getBytes(), MIME); r.set(Field.create((TEST_STRING + i))); records.add(r); } return records; } public static List<Record> createIdenticalStringRecords() { List<Record> records = new ArrayList<>(9); int id = 0; for (int i = 0; i < 9; i++) { Record r = RecordCreator.create("s", "s:1", (TEST_STRING + id).getBytes(), MIME); r.set(Field.create((TEST_STRING + id))); records.add(r); } return records; } public static List<Record> createBinaryRecords() { List<Record> records = new ArrayList<>(9); for (int i = 0; i < 9; i++) { Record record = RecordCreator.create(); Map<String, Field> map = new HashMap<>(); map.put("data", Field.create((TEST_STRING_255 + i).getBytes())); record.set(Field.create(map)); records.add(record); } return records; } public static List<Record> createIntegerRecords() { List<Record> records = new ArrayList<>(9); for (int i = 0; i < 9; i++) { Record r = RecordCreator.create("s", "s:1", (TEST_STRING + i).getBytes(), MIME); r.set(Field.create(i)); records.add(r); } return records; } public static List<KeyedMessage<String, String>> produceStringMessages(String topic, String partition, int number) { List<KeyedMessage<String, String>> messages = new ArrayList<>(); for (int i = 0; i < number; i++) { messages.add(new KeyedMessage<>(topic, partition, (TEST_STRING + i))); } return messages; } public static List<KeyedMessage<String, String>> produceStringMessages(String topic, int partitions, int number) { List<KeyedMessage<String, String>> messages = new ArrayList<>(); int partition = 0; for (int i = 0; i < number; i++) { partition = (partition + 1) % partitions; messages.add(new KeyedMessage<>(topic, String.valueOf(partition), (TEST_STRING + i))); } return messages; } public static List<Record> produce20Records() throws IOException { List<Record> list = new ArrayList<>(); for (int i = 0; i < 20; i++) { Record record = RecordCreator.create(); Map<String, Field> map = new HashMap<>(); map.put("name", Field.create("NAME" + i)); map.put("lastStatusChange", Field.create(i)); record.set(Field.create(map)); list.add(record); } return list; } public static List<KeyedMessage<String, String>> produceJsonMessages(String topic, String partition) throws IOException { ContextExtensions ctx = (ContextExtensions) ContextInfoCreator.createTargetContext("", false, OnRecordError.TO_ERROR); List<KeyedMessage<String, String>> messages = new ArrayList<>(); for (Record record : produce20Records()) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); RecordWriter rw = ctx.createRecordWriter(baos); rw.write(record); rw.close(); messages.add(new KeyedMessage<>(topic, partition, baos.toString())); } return messages; } public static List<KeyedMessage<String, String>> produceXmlMessages(String topic, String partition) throws IOException { List<String> stringList = IOUtils .readLines(KafkaTestUtil.class.getClassLoader().getResourceAsStream("testKafkaTarget.xml")); StringBuilder sb = new StringBuilder(); for (String s : stringList) { sb.append(s); } String xmlString = sb.toString(); List<KeyedMessage<String, String>> messages = new ArrayList<>(); for (int i = 0; i < 10; i++) { messages.add(new KeyedMessage<>(topic, partition, xmlString)); } return messages; } public static List<KeyedMessage<String, String>> produceCsvMessages(String topic, String partition, CSVFormat csvFormat, File csvFile) throws IOException { List<KeyedMessage<String, String>> messages = new ArrayList<>(); String line; BufferedReader bufferedReader = new BufferedReader( new FileReader(KafkaTestUtil.class.getClassLoader().getResource("testKafkaTarget.csv").getFile())); while ((line = bufferedReader.readLine()) != null) { String[] strings = line.split(","); StringWriter stringWriter = new StringWriter(); CSVPrinter csvPrinter = new CSVPrinter(stringWriter, csvFormat); csvPrinter.printRecord(strings); csvPrinter.flush(); csvPrinter.close(); messages.add(new KeyedMessage<>(topic, partition, stringWriter.toString())); } return messages; } public static List<Record> createJsonRecords() throws IOException { return produce20Records(); } public static List<Record> createJsonRecordsWithTopicPartitionField(List<String> topics, int partitions) throws IOException { int size = topics.size(); List<Record> list = new ArrayList<>(); for (String topic : topics) { for (int i = 0; i < partitions; i++) { Record record = RecordCreator.create(); Map<String, Field> map = new HashMap<>(); map.put("name", Field.create("NAME" + i)); map.put("lastStatusChange", Field.create(i)); int j = i % size; map.put("topic", Field.create(topic)); map.put("partition", Field.create(i)); record.set(Field.create(map)); list.add(record); } } return list; } public static List<Record> createJsonRecordsWithTopicField(List<String> topics) throws IOException { int size = topics.size(); List<Record> list = new ArrayList<>(); for (int i = 0; i < size * 3; i++) { Record record = RecordCreator.create(); Map<String, Field> map = new HashMap<>(); map.put("name", Field.create("NAME" + i)); map.put("lastStatusChange", Field.create(i)); map.put("partition", Field.create(i % 2)); int j = i % size; map.put("topic", Field.create(topics.get(j))); record.set(Field.create(map)); list.add(record); } return list; } public static List<Record> createCsvRecords(File csvFile) throws Exception { List<Record> records = new ArrayList<>(); String line; BufferedReader bufferedReader = new BufferedReader(new FileReader(csvFile)); while ((line = bufferedReader.readLine()) != null) { String columns[] = line.split(","); List<Field> list = new ArrayList<>(); for (String column : columns) { Map<String, Field> map = new LinkedHashMap<>(); map.put("value", Field.create(column)); list.add(Field.create(map)); } Record record = RecordCreator.create("s", "s:1", null, null); record.set(Field.create(list)); records.add(record); } return records; } public static void createTopic(ZkClient zkClient, List<KafkaServer> kafkaServers, String topic, int partitions, int replicationFactor, int timeout) { AdminUtils.createTopic(zkClient, topic, partitions, replicationFactor, new Properties()); TestUtils.waitUntilMetadataIsPropagated(scala.collection.JavaConversions.asScalaBuffer(kafkaServers), topic, 0, timeout); } /*public static String generateTestData(DataType dataType) { return generateTestData(dataType, StreamingJsonParser.Mode.MULTIPLE_OBJECTS); }*/ public static String generateTestData(DataType dataType, StreamingJsonParser.Mode jsonMode) { switch (dataType) { case TEXT: return "Hello Kafka"; case JSON: return createJson(jsonMode); case CSV: return "2010,NLDS1,PHI,NL,CIN,NL,3,0,0"; case XML: return "<book id=\"bk104\">\n" + "<author>Corets, Eva</author>\n" + "<author>CoretsXX, EvaXX</author>\n" + "<title>Oberon's Legacy</title>\n" + "<genre>Fantasy</genre>\n" + "<price>5.95</price>\n" + "<publish_date>2001-03-10</publish_date>\n" + "<description>Description</description>\n" + "</book>"; case LOG: return LOG_LINE; case LOG_STACK_TRACE: return LOG_LINE_WITH_STACK_TRACE; } throw new IllegalArgumentException("Unsupported data type requested"); } private static String createJson(StreamingJsonParser.Mode jsonMode) { switch (jsonMode) { case MULTIPLE_OBJECTS: return "{\"menu\": {\n" + " \"id\": \"1\",\n" + " \"value\": \"File\",\n" + " \"popup\": {\n" + " \"menuitem\": [\n" + " {\"value\": \"New\", \"onclick\": \"CreateNewDoc()\"},\n" + " {\"value\": \"Open\", \"onclick\": \"OpenDoc()\"},\n" + " {\"value\": \"Close\", \"onclick\": \"CloseDoc()\"}\n" + " ]\n" + " }\n" + "}}\n" + "{\"menu\": {\n" + " \"id\": \"2\",\n" + " \"value\": \"File\",\n" + " \"popup\": {\n" + " \"menuitem\": [\n" + " {\"value\": \"New\", \"onclick\": \"CreateNewDoc()\"},\n" + " {\"value\": \"Open\", \"onclick\": \"OpenDoc()\"},\n" + " {\"value\": \"Close\", \"onclick\": \"CloseDoc()\"}\n" + " ]\n" + " }\n" + "}}\n" + "{\"menu\": {\n" + " \"id\": \"3\",\n" + " \"value\": \"File\",\n" + " \"popup\": {\n" + " \"menuitem\": [\n" + " {\"value\": \"New\", \"onclick\": \"CreateNewDoc()\"},\n" + " {\"value\": \"Open\", \"onclick\": \"OpenDoc()\"},\n" + " {\"value\": \"Close\", \"onclick\": \"CloseDoc()\"}\n" + " ]\n" + " }\n" + "}}\n" + "{\"menu\": {\n" + " \"id\": \"4\",\n" + " \"value\": \"File\",\n" + " \"popup\": {\n" + " \"menuitem\": [\n" + " {\"value\": \"New\", \"onclick\": \"CreateNewDoc()\"},\n" + " {\"value\": \"Open\", \"onclick\": \"OpenDoc()\"},\n" + " {\"value\": \"Close\", \"onclick\": \"CloseDoc()\"}\n" + " ]\n" + " }\n" + "}}\n"; case ARRAY_OBJECTS: return "[\n" + "{\"menu\": {\n" + " \"id\": \"1\",\n" + " \"value\": \"File\",\n" + " \"popup\": {\n" + " \"menuitem\": [\n" + " {\"value\": \"New\", \"onclick\": \"CreateNewDoc()\"},\n" + " {\"value\": \"Open\", \"onclick\": \"OpenDoc()\"},\n" + " {\"value\": \"Close\", \"onclick\": \"CloseDoc()\"}\n" + " ]\n" + " }\n" + "}}," + "{\"menu\": {\n" + " \"id\": \"2\",\n" + " \"value\": \"File\",\n" + " \"popup\": {\n" + " \"menuitem\": [\n" + " {\"value\": \"New\", \"onclick\": \"CreateNewDoc()\"},\n" + " {\"value\": \"Open\", \"onclick\": \"OpenDoc()\"},\n" + " {\"value\": \"Close\", \"onclick\": \"CloseDoc()\"}\n" + " ]\n" + " }\n" + "}}," + "{\"menu\": {\n" + " \"id\": \"3\",\n" + " \"value\": \"File\",\n" + " \"popup\": {\n" + " \"menuitem\": [\n" + " {\"value\": \"New\", \"onclick\": \"CreateNewDoc()\"},\n" + " {\"value\": \"Open\", \"onclick\": \"OpenDoc()\"},\n" + " {\"value\": \"Close\", \"onclick\": \"CloseDoc()\"}\n" + " ]\n" + " }\n" + "}}," + "{\"menu\": {\n" + " \"id\": \"4\",\n" + " \"value\": \"File\",\n" + " \"popup\": {\n" + " \"menuitem\": [\n" + " {\"value\": \"New\", \"onclick\": \"CreateNewDoc()\"},\n" + " {\"value\": \"Open\", \"onclick\": \"OpenDoc()\"},\n" + " {\"value\": \"Close\", \"onclick\": \"CloseDoc()\"}\n" + " ]\n" + " }\n" + "}}" + "]"; } throw new IllegalArgumentException("Unsupported data type requested"); } }