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Json Utility to transform Jsons

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/*
 * Copyright (c) Balajee TM 2016.
 * All rights reserved.
 * License -  @see 
 */

/*
 * Created on 25 Aug, 2016 by balajeetm
 * http://www.balajeetm.com
 */
package com.balajeetm.mystique.core;

import java.util.List;

import org.apache.commons.collections4.CollectionUtils;

import com.balajeetm.mystique.core.util.MystiqueConstants;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;

/**
 * The Class CopyMystTurn.
 *
 * @author balajeetm
 */
public class CopyMystTurn extends AbstractMystTurn {

  /* (non-Javadoc)
   * @see com.futuresight.util.mystique.Mystique#transform(java.util.List, com.google.gson.JsonObject, java.lang.String)
   */
  @Override
  public JsonElement transmute(
      List source, JsonObject deps, JsonObject aces, JsonObject turn) {
    JsonElement transform = null;
    if (CollectionUtils.isNotEmpty(source)) {
      if (source.size() > 1) {
        transform = new JsonArray();
        for (JsonElement jsonElement : source) {
          JsonElement granularSource = getGranularSource(jsonElement, turn, deps, aces);
          granularSource = getSubset(granularSource, deps, aces, turn);
          transform.getAsJsonArray().add(granularSource);
        }
      } else {
        JsonElement granularSource = getGranularSource(source.get(0), turn, deps, aces);
        transform = getSubset(granularSource, deps, aces, turn);
      }
    }
    return transform;
  }

  /**
   * Gets the subset.
   *
   * @param source the source
   * @param deps the deps
   * @param aces the aces
   * @param turn the turn
   * @return the subset
   */
  private JsonElement getSubset(
      JsonElement source, JsonObject deps, JsonObject aces, JsonObject turn) {
    JsonElement value = null != turn ? turn.get(MystiqueConstants.VALUE) : null;
    value = mystiqueLever.isNull(value) ? null : value;
    return null != value ? mystiqueLever.subset(source, deps, aces, value) : source;
  }
}