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A Java client for Spotify's Web API
There is a newer version: 9.0.0-RC1
package com.wrapper.spotify.model_objects.specification;

import com.google.gson.JsonObject;
import com.wrapper.spotify.model_objects.AbstractModelObject;

/**
 * Retrieve information about 
 * Recommendation objects by building instances from this class.
 */
public class Recommendations extends AbstractModelObject {
  private final RecommendationsSeed[] seeds;
  private final TrackSimplified[] tracks;

  private Recommendations(final Builder builder) {
    super(builder);

    this.seeds = builder.seeds;
    this.tracks = builder.tracks;
  }

  /**
   * Get the recommendation seeds from the recommendations object.
   *
   * @return An array of recommendation seed objects.
   */
  public RecommendationsSeed[] getSeeds() {
    return seeds;
  }

  /**
   * Get the (simplified) tracks from the recommendations object.
   *
   * @return An array of track object (simplified) ordered according to the parameters supplied.
   */
  public TrackSimplified[] getTracks() {
    return tracks;
  }

  @Override
  public Builder builder() {
    return new Builder();
  }

  /**
   * Builder class for building {@link Recommendations} instances.
   */
  public static final class Builder extends AbstractModelObject.Builder {
    private RecommendationsSeed[] seeds;
    private TrackSimplified[] tracks;

    /**
     * The recommendation seeds setter.
     *
     * @param seeds An array of recommendation seed objects.
     * @return A {@link Recommendations.Builder}.
     */
    public Builder setSeeds(RecommendationsSeed... seeds) {
      this.seeds = seeds;
      return this;
    }

    /**
     * The recommendated tracks setter.
     *
     * @param tracks An array of track objects (simplified).
     * @return A {@link Recommendations.Builder}.
     */
    public Builder setTracks(TrackSimplified... tracks) {
      this.tracks = tracks;
      return this;
    }

    @Override
    public Recommendations build() {
      return new Recommendations(this);
    }
  }

  /**
   * JsonUtil class for building {@link Recommendations} instances.
   */
  public static final class JsonUtil extends AbstractModelObject.JsonUtil {
    public Recommendations createModelObject(JsonObject jsonObject) {
      if (jsonObject == null || jsonObject.isJsonNull()) {
        return null;
      }

      return new Recommendations.Builder()
              .setSeeds(
                      hasAndNotNull(jsonObject, "seeds")
                              ? new RecommendationsSeed.JsonUtil().createModelObjectArray(
                              jsonObject.getAsJsonArray("seeds"))
                              : null)
              .setTracks(
                      hasAndNotNull(jsonObject, "tracks")
                              ? new TrackSimplified.JsonUtil().createModelObjectArray(
                              jsonObject.getAsJsonArray("tracks"))
                              : null)
              .build();
    }
  }
}