parameter-object-design-pattern-after.java

public class SearchService {

  /* Parameter Object example. Default values are abstracted into the Parameter Object 
  at the time of Object creation */
  public String search(ParameterObject parameterObject) {
    return getQuerySummary(parameterObject.getType(), parameterObject.getSortBy(),
        parameterObject.getSortOrder());
  }
  
  private String getQuerySummary(String type, String sortBy, SortOrder sortOrder) {
    return "Requesting shoes of type \"" + type + "\" sorted by \"" + sortBy + "\" in \""
        + sortOrder.getValue() + "ending\" order...";
  }
}

public class ParameterObject {
  public static final String DEFAULT_SORT_BY = "price";
  public static final SortOrder DEFAULT_SORT_ORDER = SortOrder.ASC;

  private String type;
  private String sortBy = DEFAULT_SORT_BY;
  private SortOrder sortOrder = DEFAULT_SORT_ORDER;

  private ParameterObject(Builder builder) {
    type = builder.type;
    sortBy = builder.sortBy != null && !builder.sortBy.isBlank() ? builder.sortBy : sortBy;
    sortOrder = builder.sortOrder != null ? builder.sortOrder : sortOrder;
  }

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

  //Getters and Setters...

  public static final class Builder {

    private String type;
    private String sortBy;
    private SortOrder sortOrder;

    private Builder() {
    }

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

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

    public Builder sortOrder(SortOrder sortOrder) {
      this.sortOrder = sortOrder;
      return this;
    }

    public ParameterObject build() {
      return new ParameterObject(this);
    }
  }
}