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rnkoaa/Main.java

Created December 17, 2022 17:11
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  1. rnkoaa created this gist Dec 17, 2022.
    11 changes: 11 additions & 0 deletions Main.java
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    Original file line number Diff line number Diff line change
    @@ -0,0 +1,11 @@
    public static void main(String[] args) {
    try (var inputStream = Main.class.getClassLoader().getResourceAsStream("application.yml")) {
    var yamlToProperties = new YamlToProperties(inputStream);
    Map<String, Object> stringObjectMap = yamlToProperties.asProperties();
    stringObjectMap.forEach((key, value) -> {
    System.out.println("Key: " + key + ", Value: " + value);
    });
    } catch (IOException e) {
    System.out.println(e.getMessage());
    }
    }
    81 changes: 81 additions & 0 deletions YamlToProperties.java
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    @@ -0,0 +1,81 @@

    import java.io.InputStream;
    import java.util.Arrays;
    import java.util.Map;
    import java.util.Objects;
    import java.util.TreeMap;
    import java.util.stream.Collectors;
    import org.yaml.snakeyaml.Yaml;

    public class YamlToProperties {

    record Pair(String key, String value) {}

    static final Yaml yaml = new Yaml();
    TreeMap<String, Map<String, Object>> config;

    @SuppressWarnings({"raw_types", "unchecked"})
    public YamlToProperties(String content) {
    this.config = (TreeMap<String, Map<String, Object>>) yaml.loadAs(content, TreeMap.class);
    }

    @SuppressWarnings({"raw_types", "unchecked"})
    public YamlToProperties(InputStream inputStream) {
    this.config = (TreeMap<String, Map<String, Object>>) yaml.loadAs(inputStream, TreeMap.class);
    }

    @Override
    public String toString() {
    return toProperties(config);
    }

    public Map<String, Object> asProperties() {
    return toPropertyMap(config);
    }

    private static String toProperties(final TreeMap<String, Map<String, Object>> config) {
    StringBuilder sb = new StringBuilder();
    for (final String key : config.keySet()) {
    sb.append(toString(key, config.get(key)));
    }
    return sb.toString();
    }

    private static Map<String, Object> toPropertyMap(final TreeMap<String, Map<String, Object>> config) {
    return config.keySet().stream()
    .map(it -> toString(it, config.get(it)))
    .filter(it -> !it.isEmpty())
    .flatMap(it -> {
    String[] lines = it.split("\n");
    return Arrays.stream(lines)
    .map(line -> {
    String[] propertyParts = line.split("=");
    if (propertyParts.length == 2) {
    return new Pair(propertyParts[0], propertyParts[1]);
    }
    return null;
    });
    })
    .filter(Objects::nonNull)
    .collect(Collectors.toMap(Pair::key, Pair::value));
    }

    @SuppressWarnings("unchecked")
    private static String toString(final String key, final Object o) {
    StringBuilder sb = new StringBuilder();
    if (o instanceof Map) {
    Map<String, Object> map = (Map<String, Object>) o;
    for (final String mapKey : map.keySet()) {
    if (map.get(mapKey) instanceof Map) {
    sb.append(toString(String.format("%s.%s", key, mapKey), map.get(mapKey)));
    } else {
    sb.append(String.format("%s.%s=%s%n", key, mapKey,
    (null == map.get(mapKey)) ? null : map.get(mapKey).toString()));
    }
    }
    } else {
    sb.append(String.format("%s=%s%n", key, o));
    }
    return sb.toString();
    }
    }