HdfsConfFileUrlJsonFinder.java

package org.apache.mesos.hbase.util;

import java.io.IOException;
import java.net.URL;
import java.util.Iterator;
import org.codehaus.jackson.JsonNode;
import org.codehaus.jackson.map.ObjectMapper;

/**
 *
 * @author jzajic
 */
public class HdfsConfFileUrlJsonFinder {

  private ObjectMapper mapper;

  public HdfsConfFileUrlJsonFinder(ObjectMapper mapper)
  {
    this.mapper = mapper;
  }

  public String findUrl(URL jsonURL) throws IOException
  {
    JsonNode rootNode = mapper.readTree(jsonURL);
    Iterator<JsonNode> frameworkIterator = rootNode.path("frameworks").iterator();
    for (Iterator<JsonNode> iterator = frameworkIterator; iterator.hasNext();) {
      JsonNode framework = iterator.next();

      JsonNode nameNode = framework.path("name");
      if (nameNode.getTextValue().equals("hdfs"))
      {
        JsonNode uris = framework.findValue("uris");
        Iterator<JsonNode> urisIterator = uris.iterator();
        for (Iterator<JsonNode> iterator2 = urisIterator; iterator.hasNext();) {

          String value = iterator2.next().findValue("value").getTextValue();
          if (value.contains(HBaseConstants.HDFS_CONFIG_FILE_NAME))
            return value;
        };
      }
    }
    return null;
  }

}