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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.lazy;

import br.com.objectos.code.AccessInfo;
import br.com.objectos.code.MethodInfo;
import br.com.objectos.code.ModifierInfo;
import br.com.objectos.lazy.annotation.Lazy;
import br.com.objectos.metainf.Services;
import br.com.objectos.pojo.plugin.AbstractPlugin;
import br.com.objectos.pojo.plugin.Contribution;
import br.com.objectos.pojo.plugin.MethodAction;
import br.com.objectos.pojo.plugin.Plugin;
import br.com.objectos.pojo.plugin.PojoInfo;

/**
 * @author [email protected] (Marcio Endo)
 */
@Services(Plugin.class)
public class LazyPojoPlugin extends AbstractPlugin implements MethodAction {

  @Override
  protected void configure() {
    when(method(hasAnnotation(Lazy.class))).execute(this);
  }

  @Override
  public Contribution execute(PojoInfo pojoInfo, MethodInfo methodInfo) {
    if (methodInfo.hasModifierInfo(ModifierInfo.ABSTRACT)) {
      methodInfo.compilationError("@Lazy methods cannot be abstract.");
      return Contribution.empty();
    }

    if (methodInfo.hasAccessInfo(AccessInfo.PRIVATE)) {
      methodInfo.compilationError("@Lazy methods cannot be private.");
      return Contribution.empty();
    }

    if (!methodInfo.hasParameterInfoListSize(0)) {
      methodInfo.compilationError("@Lazy methods cannot have parameters.");
      return Contribution.empty();
    }

    return LazyMethod.of(pojoInfo, methodInfo).execute();
  }

}