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/*
 * Copyright 2014 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.rio.core.main;

import br.com.objectos.way.core.auto.AutoPojo;

import com.google.common.base.Optional;

/**
 * @author [email protected] (Marcio Endo)
 */
@AutoPojo
abstract class ChainedMethodInvocation extends MethodInvocation {

  abstract MethodInvocation previousMethodInvocation();

  private InvokedMethod result;

  ChainedMethodInvocation() {
  }

  public static ChainedMethodInvocationBuilder builder() {
    return new ChainedMethodInvocationBuilderPojo();
  }

  @Override
  public void eval(Rio rio) {
    InvokedMethod previousInvoked = previousMethodInvocation().result();
    if (!previousInvoked.wasSuccessfull()) {
      return;
    }

    Optional maybeReturned = previousInvoked.returnedValue();
    if (!maybeReturned.isPresent()) {
      return;
    }

    Object returned = maybeReturned.get();
    Reference reference = Reference.object(returned);
    result = invoke(reference);
  }

  @Override
  InvokedMethod invoke() {
    throw new UnsupportedOperationException("Should be called on a ReferenceMethodInvocation");
  }

  @Override
  InvokedMethod result() {
    return result;
  }

}