Working Stanford Tokenizer added.

pom.xml

@@ -45,6 +45,12 @@
       <artifactId>mallet</artifactId>
       <version>2.0.7-RC2</version>
     </dependency>
+
+    <dependency>
+      <groupId>edu.stanford.nlp</groupId>
+      <artifactId>stanford-corenlp</artifactId>
+      <version>1.3.4</version>
+    </dependency>
 
   </dependencies>
 

src/main/java/varaha/text/StanfordTokenize.java

@@ -0,0 +1,83 @@
+/*
+ * 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 varaha.text;
+
+import java.io.IOException;
+import java.io.StringReader;
+import java.util.Iterator;
+import java.util.Set;
+import java.util.HashSet;
+
+import org.apache.pig.EvalFunc;
+import org.apache.pig.data.Tuple;
+import org.apache.pig.data.TupleFactory;
+import org.apache.pig.data.DataBag;
+import org.apache.pig.data.BagFactory;
+
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.List;
+
+import edu.stanford.nlp.ling.CoreLabel;
+import edu.stanford.nlp.ling.HasWord;
+import edu.stanford.nlp.process.CoreLabelTokenFactory;
+import edu.stanford.nlp.process.DocumentPreprocessor;
+import edu.stanford.nlp.process.PTBTokenizer;
+
+/**
+ * TokenizeText uses the Lucene libraries StandardAnalyzer class to tokenize a
+ * raw text input. A list of the stopwords used is available {@link StopWords}.
+ * Output is a pig bag containing tokens.
+ *  
+ * <dt><b>Example:</b></dt>
+ * <dd><code>
+ * register varaha.jar;<br/>
+ * documents    = LOAD 'documents' AS (doc_id:chararray, text:chararray);<br/>
+ * tokenized    = FOREACH documents GENERATE doc_id AS doc_id, FLATTEN(StanfordTokenize(text)) AS (token:chararray);
+ * </code></dd>
+ * </dl>
+ * 
+ * @see
+ * @author Jacob Perkins
+ *
+ */
+public class StanfordTokenize extends EvalFunc<DataBag> {
+
+    private static TupleFactory tupleFactory = TupleFactory.getInstance();
+    private static BagFactory bagFactory = BagFactory.getInstance();
+
+    public DataBag exec(Tuple input) throws IOException {
+        if (input == null || input.size() < 1 || input.isNull(0))
+            return null;
+
+        // Output bag
+        DataBag bagOfTokens = bagFactory.newDefaultBag();
+
+        StringReader textInput = new StringReader(input.get(0).toString());
+        PTBTokenizer ptbt = new PTBTokenizer(textInput, new CoreLabelTokenFactory(), "");
+
+        for (CoreLabel label; ptbt.hasNext(); ) {
+          label = (CoreLabel)ptbt.next();
+          Tuple termText = tupleFactory.newTuple(label.toString());
+          bagOfTokens.add(termText);
+        }
+
+        return bagOfTokens;
+    }
+}