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From: tushargosavi <git@git.apache.org>
To: dev@apex.incubator.apache.org
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References: <git-pr-22-incubator-apex-malhar@git.apache.org>
In-Reply-To: <git-pr-22-incubator-apex-malhar@git.apache.org>
Subject: [GitHub] incubator-apex-malhar pull request: MLHR-1838 added parser
 and for...
Content-Type: text/plain
Message-Id: <20151009185231.22DD2DFDD7@git1-us-west.apache.org>
Date: Fri,  9 Oct 2015 18:52:31 +0000 (UTC)

Github user tushargosavi commented on a diff in the pull request:

    https://github.com/apache/incubator-apex-malhar/pull/22#discussion_r41665402
  
    --- Diff: contrib/src/main/java/com/datatorrent/contrib/schema/formatter/XmlFormatter.java ---
    @@ -0,0 +1,172 @@
    +/**
    + * 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 com.datatorrent.contrib.schema.formatter;
    +
    +import java.io.Writer;
    +
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import org.apache.hadoop.classification.InterfaceStability;
    +
    +import com.datatorrent.api.Context;
    +
    +import com.thoughtworks.xstream.XStream;
    +import com.thoughtworks.xstream.XStreamException;
    +import com.thoughtworks.xstream.converters.basic.DateConverter;
    +import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
    +import com.thoughtworks.xstream.io.xml.CompactWriter;
    +import com.thoughtworks.xstream.io.xml.XppDriver;
    +
    +/**
    + * @displayName XmlParser
    + * @category Formatter
    + * @tags xml pojo formatter
    + */
    +@InterfaceStability.Evolving
    +public class XmlFormatter extends Formatter<String>
    +{
    +
    +  private transient XStream xstream;
    +
    +  protected String alias;
    +  protected String dateFormat;
    +  protected boolean prettyPrint;
    +
    +  public XmlFormatter()
    +  {
    +    alias = null;
    +    dateFormat = null;
    +  }
    +
    +  @Override
    +  public void activate(Context context)
    +  {
    +    if (prettyPrint) {
    +      xstream = new XStream();
    +    } else {
    +      xstream = new XStream(new XppDriver()
    +      {
    +        @Override
    +        public HierarchicalStreamWriter createWriter(Writer out)
    +        {
    +          return new CompactWriter(out, getNameCoder());
    +        }
    +      });
    +    }
    +    if (alias != null) {
    +      try {
    +        xstream.alias(alias, clazz);
    +      } catch (Throwable e) {
    +        throw new RuntimeException("Unable find provided class");
    +      }
    +    }
    +    if (dateFormat != null) {
    +      xstream.registerConverter(new DateConverter(dateFormat, new String[] {}));
    +    }
    +  }
    +
    +  @Override
    +  public void deactivate()
    +  {
    +
    +  }
    +
    +  @Override
    +  public String convert(Object tuple)
    +  {
    +    try {
    +      return xstream.toXML(tuple);
    +    } catch (XStreamException e) {
    +      logger.error("Error while converting tuple {} ", tuple + " " + e.getMessage());
    --- End diff --
    
    same as above.


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