[FLINK-1615] [java api] SimpleTweetInputFormat

This closes apache#621
This closes apache#442

flink-contrib/docker-flink/flink/conf/logback-yarn.xml

@@ -36,4 +36,4 @@
         <appender-ref ref="file"/>
         <appender-ref ref="console"/>
     </root>
-</configuration>
+</configuration>

flink-contrib/pom.xml

@@ -18,8 +18,9 @@ specific language governing permissions and limitations
 under the License.
 
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
 
 	<modelVersion>4.0.0</modelVersion>
 
@@ -36,6 +37,21 @@ under the License.
 	<packaging>jar</packaging>
 
 	<dependencies>
+		<dependency>
+			<groupId>org.apache.flink</groupId>
+			<artifactId>flink-java</artifactId>
+			<version>${project.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>com.googlecode.json-simple</groupId>
+			<artifactId>json-simple</artifactId>
+			<version>1.1.1</version>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.flink</groupId>
+			<artifactId>flink-clients</artifactId>
+			<version>${project.version}</version>
+		</dependency>
 	</dependencies>
 
 </project>

flink-contrib/src/main/java/org/apache/flink/contrib/tweetinputformat/io/SimpleTweetInputFormat.java

@@ -0,0 +1,93 @@
+/*
+ * 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.flink.contrib.tweetinputformat.io;
+
+import org.apache.flink.api.common.io.DelimitedInputFormat;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.java.typeutils.GenericTypeInfo;
+import org.apache.flink.api.java.typeutils.ResultTypeQueryable;
+import org.apache.flink.contrib.tweetinputformat.model.tweet.Tweet;
+import org.apache.flink.core.fs.FileInputSplit;
+import org.codehaus.jackson.JsonParseException;
+import org.json.simple.parser.JSONParser;
+import org.json.simple.parser.ParseException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+
+public class SimpleTweetInputFormat extends DelimitedInputFormat<Tweet> implements ResultTypeQueryable<Tweet> {
+
+	private static final Logger LOG = LoggerFactory.getLogger(SimpleTweetInputFormat.class);
+
+	private transient JSONParser parser;
+	private transient TweetHandler handler;
+
+	@Override
+	public void open(FileInputSplit split) throws IOException {
+		super.open(split);
+		this.handler = new TweetHandler();
+		this.parser = new JSONParser();
+	}
+
+	@Override
+	public Tweet nextRecord(Tweet record) throws IOException {
+		Boolean result = false;
+
+		do {
+			try {
+				record.reset(0);
+				record = super.nextRecord(record);
+				result = true;
+
+			} catch (JsonParseException e) {
+				result = false;
+
+			}
+		} while (!result);
+
+		return record;
+	}
+
+	@Override
+	public Tweet readRecord(Tweet reuse, byte[] bytes, int offset, int numBytes) throws IOException {
+
+		InputStreamReader jsonReader = new InputStreamReader(new ByteArrayInputStream(bytes));
+		jsonReader.skip(offset);
+
+		try {
+
+			handler.reuse = reuse;
+			parser.parse(jsonReader, handler, false);
+		} catch (ParseException e) {
+
+			LOG.debug(" Tweet Parsing Exception : " + e.getMessage());
+		}
+
+		return reuse;
+	}
+
+	@Override
+	public TypeInformation<Tweet> getProducedType() {
+		return new GenericTypeInfo<Tweet>(Tweet.class);
+	}
+}