org.springframework.boot.env.YamlPropertySourceLoader.java Source code

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Here is the source code for org.springframework.boot.env.YamlPropertySourceLoader.java

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/*
 * Copyright 2012-2019 the original author or 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 org.springframework.boot.env;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import org.springframework.core.env.PropertySource;
import org.springframework.core.io.Resource;
import org.springframework.util.ClassUtils;

/**
 * Strategy to load '.yml' (or '.yaml') files into a {@link PropertySource}.
 *
 * @author Dave Syer
 * @author Phillip Webb
 * @author Andy Wilkinson
 * @since 1.0.0
 */
public class YamlPropertySourceLoader implements PropertySourceLoader {

    @Override
    public String[] getFileExtensions() {
        return new String[] { "yml", "yaml" };
    }

    @Override
    public List<PropertySource<?>> load(String name, Resource resource) throws IOException {
        if (!ClassUtils.isPresent("org.yaml.snakeyaml.Yaml", null)) {
            throw new IllegalStateException(
                    "Attempted to load " + name + " but snakeyaml was not found on the classpath");
        }
        List<Map<String, Object>> loaded = new OriginTrackedYamlLoader(resource).load();
        if (loaded.isEmpty()) {
            return Collections.emptyList();
        }
        List<PropertySource<?>> propertySources = new ArrayList<>(loaded.size());
        for (int i = 0; i < loaded.size(); i++) {
            String documentNumber = (loaded.size() != 1) ? " (document #" + i + ")" : "";
            propertySources.add(new OriginTrackedMapPropertySource(name + documentNumber,
                    Collections.unmodifiableMap(loaded.get(i)), true));
        }
        return propertySources;
    }

}