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Bootique is a simple DI-based framework for launching command-line Java applications of any kind. Be it webservices, webapps, jobs, etc.

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/*
 * Licensed to ObjectStyle LLC under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ObjectStyle LLC licenses
 * this file to you 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.bootique.config;

import io.bootique.cli.Cli;
import io.bootique.log.BootLogger;
import io.bootique.resource.ResourceFactory;

import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.stream.Stream;

/**
 * A {@link ConfigurationSource} that locates configuration in a resource
 * specified via command-line '--config' option.
 */
public class CliConfigurationSource implements ConfigurationSource {

    public static final String CONFIG_OPTION = "config";

    private List locations;
    private BootLogger bootLogger;

    protected CliConfigurationSource(List locations, BootLogger bootLogger) {
        this.locations = locations;
        this.bootLogger = bootLogger;
    }

    public static Builder builder(BootLogger bootLogger) {
        return new Builder(bootLogger);
    }

    @Override
    public Stream get() {
        return locations.stream().map(this::toURL);
    }

    protected URL toURL(String location) {
        bootLogger.trace(() -> "Reading configuration at " + location);
        return new ResourceFactory(location).getUrl();
    }

    /**
     * @since 0.25
     */
    public static class Builder {
        private BootLogger bootLogger;

        private Set diConfigs;
        private List cliConfigs;
        private Set diPostConfigs;

        protected Builder(BootLogger bootLogger) {
            this.bootLogger = bootLogger;
            this.diConfigs = Collections.emptySet();
            this.cliConfigs = Collections.emptyList();
            this.diPostConfigs = Collections.emptySet();
        }

        public Builder cliConfigs(Cli cli) {
            this.cliConfigs = cli.optionStrings(CONFIG_OPTION);
            return this;
        }

        public Builder diConfigs(Set diConfigs) {
            this.diConfigs = diConfigs;
            return this;
        }

        /**
         * @since 2.0
         */
        public Builder diPostConfigs(Set diPostConfigs) {
            this.diPostConfigs = diPostConfigs;
            return this;
        }

        public CliConfigurationSource build() {
            return new CliConfigurationSource(mergeConfigs(), bootLogger);
        }

        private List mergeConfigs() {

            // 1. DI configs go first in undefined order
            // 2. CLI configs follow in the order they were declared on command line
            // 3. DI post-configs go last

            List merged = new ArrayList<>(diConfigs);
            merged.addAll(cliConfigs);
            merged.addAll(diPostConfigs);
            return merged;
        }
    }
}