/*
 * Copyright (c) 2016 Cisco and/or its affiliates.
 *
 * 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.fd.honeycomb.infra.distro.activation;

import com.google.inject.Module;

import java.util.Set;
import java.util.stream.Collectors;

import static java.lang.String.format;

/**
 * Provides static set of active activeModulesClasses
 */
public class ActiveModules {
    private final Set<Class<? extends Module>> activeModulesClasses;

    public ActiveModules(final Set<Class<? extends Module>> activeModulesClasses) {
        this.activeModulesClasses = activeModulesClasses;
    }

    public Set<Class<? extends Module>> getActiveModulesClasses() {
        return activeModulesClasses;
    }

    public Set<? extends Module> createModuleInstances() {
        return activeModulesClasses.stream()
                .map(moduleClass -> {
                    try {
                        return moduleClass.newInstance();
                    } catch (InstantiationException | IllegalAccessException e) {
                        throw new IllegalStateException(format("Unable to create instance of module %s", moduleClass),
                                e);
                    }
                }).collect(Collectors.toSet());
    }

    @Override
    public String toString() {
        return "ActiveModules{" +
                "activeModulesClasses=" + activeModulesClasses +
                '}';
    }
}