datahub/wherehows-frontend/app/utils/SchemaHistory.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 java.util.Iterator;
import java.util.Map;


public class SchemaHistory {

  public static int calculateDict(JsonNode node) {
    int count = 0;
    Iterator<Map.Entry<String, JsonNode>> iterator = node.fields();
    while (iterator.hasNext()) {
      Map.Entry<String, JsonNode> element = iterator.next();
      if (element.getValue().isArray()) {
        if (element.getKey().toLowerCase() == "fields") {
          count += element.getValue().size();
        }
        count += calculateList(element.getValue());
      } else if (element.getValue().isContainerNode()) {
        if (element.getKey().toLowerCase() == "fields") {
          count += element.getValue().size();
        }
        count += calculateDict(element.getValue());
      } else if (element.getKey().toLowerCase() == "fields") {
        count += 1;
      }
    }
    return count;
  }

  public static int calculateList(JsonNode node) {
    int count = 0;
    Iterator<JsonNode> arrayIterator = node.elements();
    while (arrayIterator.hasNext()) {
      JsonNode element = arrayIterator.next();
      if (element.isArray()) {
        count += calculateList(element);
      } else if (element.isContainerNode()) {
        count += calculateDict(element);
      }
    }
    return count;
  }

  public static int calculateFieldCount(JsonNode node) {
    int count = 0;
    JsonNode schemaNode = null;

    if (node != null && node.has("schema")) {
      schemaNode = node.get("schema");
    } else {
      schemaNode = node;
    }
    if (schemaNode.isArray()) {

      Iterator<JsonNode> arrayIterator = schemaNode.elements();
      while (arrayIterator.hasNext()) {
        JsonNode element = arrayIterator.next();
        if (element.isArray()) {
          count += calculateList(element);
        } else if (element.isContainerNode()) {
          count += calculateDict(element);
        }
      }
    } else if (schemaNode.isContainerNode()) {
      Iterator<Map.Entry<String, JsonNode>> iterator = schemaNode.fields();
      while (iterator.hasNext()) {
        Map.Entry<String, JsonNode> element = iterator.next();
        if (element.getValue().isArray()) {
          if (element.getKey().toLowerCase() == "fields") {
            count += element.getValue().size();
          }
          count += calculateList(element.getValue());
        } else if (element.getValue().isContainerNode()) {
          if (element.getKey().toLowerCase() == "fields") {
            count += element.getValue().size();
          }
          count += calculateDict(element.getValue());
        } else if (element.getKey().toLowerCase() == "fields") {
          count += 1;
        }
      }
    }
    return count;
  }
}