com.teradata.benchto.driver.utils.YamlUtils.java Source code

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Here is the source code for com.teradata.benchto.driver.utils.YamlUtils.java

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/*
 * 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 com.teradata.benchto.driver.utils;

import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableList;
import org.yaml.snakeyaml.Yaml;

import java.util.List;
import java.util.Map;
import java.util.stream.StreamSupport;

import static java.util.stream.Collectors.toList;
import static java.util.stream.Collectors.toMap;

/**
 * Useful methods for dealing with Yaml files.
 */
public final class YamlUtils {
    @SuppressWarnings("unchecked")
    public static Map<String, Object> loadYamlFromString(String string) {
        Yaml yaml = new Yaml();
        return (Map<String, Object>) yaml.load(string);
    }

    public static Map<String, List<String>> stringifyMultimap(Map<String, Object> variableMap) {
        return variableMap.entrySet().stream().collect(toMap(Map.Entry::getKey, e -> asStringList(e.getValue())));
    }

    public static List<String> asStringList(Object object) {
        if (!(object instanceof Iterable<?>)) {
            return ImmutableList.copyOf(Splitter.on(",").trimResults().omitEmptyStrings().split(object.toString()));
        } else {
            Iterable<?> iterable = (Iterable<?>) object;
            return StreamSupport.stream(iterable.spliterator(), false).map(Object::toString).collect(toList());
        }
    }

    private YamlUtils() {
    }
}