datahub/wherehows-api/app/utils/Dataset.java

/**
 * Copyright 2015 LinkedIn Corp. All rights reserved.
 *
 * Licensed 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.
 */
package utils;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import org.apache.commons.lang3.StringUtils;

import play.Logger;
import play.cache.Cache;
import java.io.BufferedReader;
import java.io.FileReader;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class Dataset
{
    private static Cache currentCache = null;

    public static final String URNIDMAPKey = "impactUrnIDMap";

    public static Cache getChacheInstance()
    {
        if (currentCache == null)
        {
            currentCache = new Cache();
        }
        return currentCache;
    }

    public static JsonNode addDatasetIDtoImpactAnalysisResult(JsonNode impacts)
    {
        if (impacts == null || (!impacts.isArray()))
        {
            return impacts;
        }

        try
        {
            Map<String, Integer> urnIDMap = new HashMap<String, Integer>();
            if (getChacheInstance().get("URNIDMAPKey") != null)
            {
                urnIDMap = (Map<String, Integer>)getChacheInstance().get("URNIDMAPKey");
            }
            else
            {
                FileReader fr = new FileReader("/var/tmp/wherehows/resource/dataset_urn_list.txt");
                BufferedReader br = new BufferedReader(fr);
                String line;

                while((line = br.readLine()) != null)
                {
                    String record = line.substring(0, line.length());
                    String[] values = record.split("\t");
                    if (values != null && values.length == 2)
                    {
                        String urn = values[0];
                        Integer id = Integer.parseInt(values[1]);
                        if (StringUtils.isNotBlank(urn) && id != null && id != 0)
                        {
                            urnIDMap.put(urn, id);
                        }
                    }
                }
                if (urnIDMap != null && urnIDMap.size() > 0)
                {
                    getChacheInstance().set(URNIDMAPKey, urnIDMap);
                }
            }

            if (urnIDMap != null && urnIDMap.size() > 0)
            {
                Iterator<JsonNode> arrayIterator = impacts.elements();
                if (arrayIterator != null)
                {
                    while (arrayIterator.hasNext())
                    {
                        JsonNode node = arrayIterator.next();
                        if (node.isContainerNode() && node.has("urn"))
                        {
                            String urn = node.get("urn").asText();
                            ObjectNode objectNode = (ObjectNode)node;
                            int index = urn.lastIndexOf("/");
                            String name = urn.substring(index+1);
                            objectNode.put("name", name);
                            if (urnIDMap.containsKey(urn))
                            {
                                Integer id = urnIDMap.get(urn);
                                objectNode.put("id", id);
                            }
                        }
                    }
                }
            }
        }
        catch (Exception e) {
            Logger.error(e.getMessage());
        }
        return impacts;
    }
}