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/*
 * Copyright 2017-2020 original authors
 *
 * 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
 *
 * https://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.micronaut.context.env.yaml;

import io.micronaut.context.env.AbstractPropertySourceLoader;
import io.micronaut.core.util.CollectionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.yaml.snakeyaml.Yaml;

import java.io.InputStream;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

/**
 * Loads properties from a YML file.
 *
 * @author Graeme Rocher
 * @since 1.0
 */
public class YamlPropertySourceLoader extends AbstractPropertySourceLoader {

    private static final Logger LOG = LoggerFactory.getLogger(YamlPropertySourceLoader.class);

    @Override
    public boolean isEnabled() {
        return isSnakeYamlPresent();
    }

    @Override
    public Set getExtensions() {
        return CollectionUtils.setOf("yml", "yaml");
    }

    @Override
    protected void processInput(String name, InputStream input, Map finalMap) {
        // workaround for Graal which returns null
        if (System.getProperty("java.runtime.name") == null) {
            System.setProperty("java.runtime.name", "Unknown");
        }

        Yaml yaml = new Yaml();
        Iterable