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/*
 * Copyright 2015 Objectos, Fábrica de Software LTDA.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package br.com.objectos.way.testable;

import java.util.Objects;

/**
 * @author [email protected] (Marcio Endo)
 */
class Property {

  private final String name;
  private final Getter getter;

  private Property(String name, Getter getter) {
    this.name = name;
    this.getter = getter;
  }

  public static  Property of(String name, Getter getter) {
    Objects.requireNonNull(name);
    Objects.requireNonNull(getter);
    return new Property<>(name, getter);
  }

  public Equality test(T first, T second, TestMap map) {
    Object a = getter.apply(first);
    Object b = getter.apply(second);
    return testUnchecked(a, b, map);
  }

  private  Equality testUnchecked(X a, X b, TestMap map) {
    if (a == null) {
      return b == null ? Equality.equal() : Equality.notEqual(name, "null", b.toString());
    }

    Class type = a.getClass();
    @SuppressWarnings("unchecked")
    Test test = (Test) map.get(type);
    return test.execute(name, a, b);
  }

}