service/src/main/java/io/mifos/identity/internal/command/handler/RoleCommandHandler.java

/*
 * Copyright 2017 The Mifos Initiative.
 *
 * 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 io.mifos.identity.internal.command.handler;

import io.mifos.core.command.annotation.Aggregate;
import io.mifos.core.command.annotation.CommandHandler;
import io.mifos.core.command.annotation.CommandLogLevel;
import io.mifos.core.command.annotation.EventEmitter;
import io.mifos.identity.api.v1.domain.Role;
import io.mifos.identity.api.v1.events.EventConstants;
import io.mifos.identity.internal.command.ChangeRoleCommand;
import io.mifos.identity.internal.command.CreateRoleCommand;
import io.mifos.identity.internal.command.DeleteRoleCommand;
import io.mifos.identity.internal.mapper.PermissionMapper;
import io.mifos.identity.internal.repository.RoleEntity;
import io.mifos.identity.internal.repository.Roles;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.Assert;

import javax.annotation.Nonnull;
import java.util.Optional;
import java.util.stream.Collectors;

/**
 * @author Myrle Krantz
 */
@SuppressWarnings("unused")
@Aggregate
@Component
public class RoleCommandHandler {

  private final Roles roles;

  @Autowired
  public RoleCommandHandler(final Roles roles)
  {
    this.roles = roles;
  }

  @CommandHandler(logStart = CommandLogLevel.INFO, logFinish = CommandLogLevel.INFO)
  @EventEmitter(selectorName = EventConstants.OPERATION_HEADER, selectorValue = EventConstants.OPERATION_PUT_ROLE)
  public String process(final ChangeRoleCommand command) {
    final Optional<RoleEntity> instance = roles.get(command.getIdentifier());
    Assert.isTrue(instance.isPresent());

    instance.ifPresent(x -> roles.change(mapRole(command.getInstance())));

    return command.getInstance().getIdentifier();
  }

  @CommandHandler(logStart = CommandLogLevel.INFO, logFinish = CommandLogLevel.INFO)
  @EventEmitter(selectorName = EventConstants.OPERATION_HEADER, selectorValue = EventConstants.OPERATION_POST_ROLE)
  public String process(final CreateRoleCommand command) {
    Assert.isTrue(!roles.get(command.getInstance().getIdentifier()).isPresent());

    roles.add(mapRole(command.getInstance()));

    return command.getInstance().getIdentifier();
  }

  @CommandHandler(logStart = CommandLogLevel.INFO, logFinish = CommandLogLevel.INFO)
  @EventEmitter(selectorName = EventConstants.OPERATION_HEADER, selectorValue = EventConstants.OPERATION_DELETE_ROLE)
  public String process(final DeleteRoleCommand command) {
    final Optional<RoleEntity> instance = roles.get(command.getIdentifier());
    Assert.isTrue(instance.isPresent());

    instance.ifPresent(roles::delete);

    return command.getIdentifier();
  }

  private @Nonnull RoleEntity mapRole(
      @Nonnull final Role role) {
    final RoleEntity ret = new RoleEntity();
    ret.setIdentifier(role.getIdentifier());
    ret.setPermissions(role.getPermissions().stream()
            .map(PermissionMapper::mapToPermissionType)
            .collect(Collectors.toList()));

    return ret;
  }
}