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Stream Feeds Java Client for backend and android integrations
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package io.getstream.core.models;

import static com.google.common.base.Preconditions.checkNotNull;
import static io.getstream.core.utils.Serialization.convert;

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonInclude.Include;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonPOJOBuilder;
import com.google.common.base.MoreObjects;
import java.util.Date;
import java.util.List;
import java.util.Objects;

@JsonInclude(Include.NON_NULL)
@JsonDeserialize(builder = Engagement.Builder.class)
public class Engagement {
  private final String feedID;
  private final UserData userData;
  private final String label;
  private final Content content;
  private final Integer boost;
  private final Integer position;
  private final String location;
  private final List features;
  private final Date trackedAt;

  private Engagement(Builder builder) {
    label = builder.label;
    content = builder.content;
    boost = builder.boost;
    position = builder.position;
    feedID = builder.feedID;
    location = builder.location;
    userData = builder.userData;
    features = builder.features;
    trackedAt = builder.trackedAt;
  }

  public static Builder builder() {
    return new Builder();
  }

  public String getLabel() {
    return label;
  }

  public Content getContent() {
    return content;
  }

  public int getBoost() {
    return boost;
  }

  public int getPosition() {
    return position;
  }

  @JsonProperty("feed_id")
  public String getFeedID() {
    return feedID;
  }

  public String getLocation() {
    return location;
  }

  @JsonProperty("user_data")
  public UserData getUserData() {
    return userData;
  }

  public List getFeatures() {
    return features;
  }

  @JsonProperty("tracked_at")
  public Date getTrackedAt() {
    return trackedAt;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;
    Engagement that = (Engagement) o;
    return Objects.equals(label, that.label)
        && Objects.equals(content, that.content)
        && Objects.equals(boost, that.boost)
        && Objects.equals(position, that.position)
        && Objects.equals(feedID, that.feedID)
        && Objects.equals(location, that.location)
        && Objects.equals(userData, that.userData)
        && Objects.equals(features, that.features)
        && Objects.equals(trackedAt, that.trackedAt);
  }

  @Override
  public int hashCode() {
    return Objects.hash(
        label, content, boost, position, feedID, location, userData, features, trackedAt);
  }

  @Override
  public String toString() {
    return MoreObjects.toStringHelper(this)
        .add("label", this.label)
        .add("content", this.content)
        .add("boost", this.boost)
        .add("position", this.position)
        .add("feedID", this.feedID)
        .add("location", this.location)
        .add("userData", this.userData)
        .add("features", this.features)
        .add("trackedAt", this.trackedAt)
        .toString();
  }

  @JsonPOJOBuilder(withPrefix = "")
  public static final class Builder {
    private String label;
    private Content content;
    private Integer boost;
    private Integer position;
    private String feedID;
    private String location;
    private UserData userData;
    private List features;
    private Date trackedAt;

    public Builder label(String label) {
      this.label = label;
      return this;
    }

    public Builder content(Content content) {
      this.content = content;
      return this;
    }

    public Builder boost(int boost) {
      this.boost = boost;
      return this;
    }

    public Builder position(int position) {
      this.position = position;
      return this;
    }

    @JsonProperty("feed_id")
    public Builder feedID(String feedID) {
      this.feedID = feedID;
      return this;
    }

    public Builder location(String location) {
      this.location = location;
      return this;
    }

    @JsonProperty("user_data")
    public Builder userData(UserData userData) {
      this.userData = userData;
      return this;
    }

    public Builder features(List features) {
      this.features = features;
      return this;
    }

    @JsonProperty("tracked_at")
    public Builder trackedAt(Date trackedAt) {
      this.trackedAt = trackedAt;
      return this;
    }

    @JsonIgnore
    public Builder fromEngagement(Engagement engagement) {
      label = engagement.label;
      content = engagement.content;
      boost = engagement.boost;
      position = engagement.position;
      feedID = engagement.feedID;
      location = engagement.location;
      userData = engagement.userData;
      features = engagement.features;
      trackedAt = engagement.trackedAt;
      return this;
    }

    @JsonIgnore
    public  Builder fromCustomEngagement(T custom) {
      return fromEngagement(convert(custom, Engagement.class));
    }

    public Engagement build() {
      checkNotNull(feedID, "Engagement 'feedID' field required");
      checkNotNull(userData, "Engagement 'userData' field required");
      checkNotNull(label, "Engagement 'label' field required");
      checkNotNull(content, "Engagement 'content' field required");

      return new Engagement(this);
    }
  }
}