package jetbrains.mps.core.aspects.behaviour.api;/*
 * Copyright 2003-2015 JetBrains s.r.o.
 *
 * 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.
 */

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * Represents a type abstraction in MPS.
 */
public interface SAbstractType {

  /**
   * every type must define its own default value
   * @return the default value
   */
  @Nullable Object getDefaultValue();

  /**
   * @param another -- another type
   * @return true iff objects of the type could be assigned to object of this type
   *
   * @see java.lang.Class#isAssignableFrom(Class)
   */
  boolean isAssignableFrom(@NotNull SAbstractType another);
}
