com.gruelbox.transactionoutbox.Validator Maven / Gradle / Ivy

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package com.gruelbox.transactionoutbox;

import java.time.Clock;
import java.util.function.Supplier;

class Validator {

  private final String path;
  private final Supplier clockProvider;

  Validator(Supplier clockProvider) {
    this.clockProvider = clockProvider;
    this.path = "";
  }

  private Validator(String className, Validator validator) {
    this.clockProvider = validator.clockProvider;
    this.path = className;
  }

  public void validate(Validatable validatable) {
    validatable.validate(new Validator(validatable.getClass().getSimpleName(), this));
  }

  public void valid(String propertyName, Object object) {
    notNull(propertyName, object);
    if (!(object instanceof Validatable)) {
      return;
    }
    ((Validatable) object)
        .validate(new Validator(path.isEmpty() ? propertyName : (path + "." + propertyName), this));
  }

  public void notNull(String propertyName, Object object) {
    if (object == null) {
      error(propertyName, "may not be null");
    }
  }

  public void isTrue(String propertyName, boolean condition, String message, Object... args) {
    if (!condition) {
      error(propertyName, String.format(message, args));
    }
  }

  public void nullOrNotBlank(String propertyName, String object) {
    if (object != null && object.isEmpty()) {
      error(propertyName, "may be either null or non-blank");
    }
  }

  public void notBlank(String propertyName, String object) {
    notNull(propertyName, object);
    if (object.isEmpty()) {
      error(propertyName, "may not be blank");
    }
  }

  public void positiveOrZero(String propertyName, int object) {
    min(propertyName, object, 0);
  }

  public void min(String propertyName, int object, int minimumValue) {
    if (object < minimumValue) {
      error(propertyName, "must be greater than " + minimumValue);
    }
  }

  private void error(String propertyName, String message) {
    throw new IllegalArgumentException(
        (path.isEmpty() ? "" : path + ".") + propertyName + " " + message);
  }
}