content: package pl.allegro.tech.hermes.api;
  
  import static pl.allegro.tech.hermes.api.constraints.Names.ALLOWED_NAME_REGEX;
  
  import com.fasterxml.jackson.annotation.JsonCreator;
  import com.fasterxml.jackson.annotation.JsonProperty;
  import com.google.common.base.Strings;
  import jakarta.validation.constraints.NotEmpty;
  import jakarta.validation.constraints.Pattern;
  import java.util.Objects;
  
  public class TopicName {
  
    public static final char GROUP_SEPARATOR = '.';
  
    @NotEmpty
    @Pattern(regexp = ALLOWED_NAME_REGEX)
    private final String groupName;
  
    @NotEmpty
    @Pattern(regexp = ALLOWED_NAME_REGEX)
    private final String name;
  
    @JsonCreator
    public TopicName(@JsonProperty("groupName") String groupName, @JsonProperty("name") String name) {
      this.groupName = groupName;
      this.name = name;
    }
  
    public static String toQualifiedName(TopicName topicName) {
      return topicName != null ? topicName.qualifiedName() : null;
    }
  
    public static TopicName fromQualifiedName(String qualifiedName) {
      if (Strings.isNullOrEmpty(qualifiedName)) {
        return null;
      }
  
      int index = qualifiedName.lastIndexOf(GROUP_SEPARATOR);
      if (index == -1) {
        throw new IllegalArgumentException("Invalid qualified name " + qualifiedName);
      }
  
      String groupName = qualifiedName.substring(0, index);
      String topicName = qualifiedName.substring(index + 1, qualifiedName.length());
      return new TopicName(groupName, topicName);
    }
  
    public String getGroupName() {
      return groupName;
    }
  
    public String getName() {
      return name;
    }
  
    public String qualifiedName() {
      return groupName + GROUP_SEPARATOR + name;
    }
  
    @Override
    public String toString() {
      return qualifiedName();
    }
  
    @Override
    public boolean equals(Object o) {
      if (this == o) {
        return true;
      }
      if (o == null || getClass() != o.getClass()) {
        return false;
      }
  
      TopicName that = (TopicName) o;
  
      return Objects.equals(this.name, that.name) && Objects.equals(this.groupName, that.groupName);
    }
  
    @Override
    public int hashCode() {
      return Objects.hash(name, groupName);
    }
  }
  