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Java Client for Serialized APIs
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package io.serialized.client.feed;

import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.commons.lang3.builder.HashCodeBuilder;
import org.apache.commons.lang3.builder.ToStringBuilder;

import java.util.Map;
import java.util.UUID;

import static java.util.Collections.emptyMap;
import static java.util.Collections.unmodifiableMap;
import static org.apache.commons.lang3.builder.ToStringStyle.SHORT_PREFIX_STYLE;

public class Event {

  private UUID eventId;
  private String eventType;
  private Map data;
  private String encryptedData;

  public UUID eventId() {
    return eventId;
  }

  public String eventType() {
    return eventType;
  }

  public Map data() {
    return data == null ? emptyMap() : unmodifiableMap(data);
  }

  public  T dataValueAs(String key, Class clazz) {
    Object obj = data().get(key);
    if (obj == null) {
      throw new IllegalArgumentException("Key does not exist: " + key);
    } else {
      return clazz.cast(data.get(key));
    }
  }

  public String encryptedData() {
    return encryptedData;
  }

  @Override
  public int hashCode() {
    return HashCodeBuilder.reflectionHashCode(this);
  }

  @Override
  public boolean equals(Object obj) {
    return EqualsBuilder.reflectionEquals(this, obj);
  }

  @Override
  public String toString() {
    return ToStringBuilder.reflectionToString(this, SHORT_PREFIX_STYLE);
  }

  public static class Builder {

    private final String eventType;
    private UUID eventId;
    private Map data;
    private String encryptedData;

    public Builder(String eventType) {
      this.eventType = eventType;
    }

    public Builder withEventId(String eventId) {
      this.eventId = UUID.fromString(eventId);
      return this;
    }

    public Builder withEventId(UUID eventId) {
      this.eventId = eventId;
      return this;
    }

    public Builder withData(Map data) {
      this.data = data;
      return this;
    }

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

    public Event build() {
      Event event = new Event();
      event.eventType = this.eventType;
      event.eventId = this.eventId;
      event.data = this.data;
      event.encryptedData = this.encryptedData;
      return event;
    }

  }

}