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Eppo SDK for JVM shared library
There is a newer version: 3.3.2
package cloud.eppo.ufc.dto;

import java.util.List;

public class EppoValue {
  protected final EppoValueType type;
  protected Boolean boolValue;
  protected Double doubleValue;
  protected String stringValue;
  protected List stringArrayValue;

  protected EppoValue() {
    this.type = EppoValueType.NULL;
  }

  protected EppoValue(boolean boolValue) {
    this.boolValue = boolValue;
    this.type = EppoValueType.BOOLEAN;
  }

  protected EppoValue(double doubleValue) {
    this.doubleValue = doubleValue;
    this.type = EppoValueType.NUMBER;
  }

  protected EppoValue(String stringValue) {
    this.stringValue = stringValue;
    this.type = EppoValueType.STRING;
  }

  protected EppoValue(List stringArrayValue) {
    this.stringArrayValue = stringArrayValue;
    this.type = EppoValueType.ARRAY_OF_STRING;
  }

  public static EppoValue nullValue() {
    return new EppoValue();
  }

  public static EppoValue valueOf(boolean boolValue) {
    return new EppoValue(boolValue);
  }

  public static EppoValue valueOf(double doubleValue) {
    return new EppoValue(doubleValue);
  }

  public static EppoValue valueOf(String stringValue) {
    return new EppoValue(stringValue);
  }

  public static EppoValue valueOf(List value) {
    return new EppoValue(value);
  }

  public boolean booleanValue() {
    return this.boolValue;
  }

  public double doubleValue() {
    return this.doubleValue;
  }

  public String stringValue() {
    return this.stringValue;
  }

  public List stringArrayValue() {
    return this.stringArrayValue;
  }

  public boolean isNull() {
    return type == EppoValueType.NULL;
  }

  public boolean isBoolean() {
    return this.type == EppoValueType.BOOLEAN;
  }

  public boolean isNumeric() {
    return this.type == EppoValueType.NUMBER;
  }

  public boolean isString() {
    return this.type == EppoValueType.STRING;
  }

  public boolean isStringArray() {
    return type == EppoValueType.ARRAY_OF_STRING;
  }

  @Override
  public String toString() {
    switch (this.type) {
      case BOOLEAN:
        return this.boolValue.toString();
      case NUMBER:
        return this.doubleValue.toString();
      case STRING:
        return this.stringValue;
      case ARRAY_OF_STRING:
        return String.join(" ,", this.stringArrayValue);
      case NULL:
        return "";
      default:
        throw new UnsupportedOperationException(
            "Cannot stringify Eppo Value type " + this.type.name());
    }
  }
}