Java Yaml.dump方法代码示例

import com.fasterxml.jackson.dataformat.yaml.snakeyaml.Yaml; //导入方法依赖的package包/类
private static String makeYaml(List<Map.Entry<String, Map<String, Object>>> keysAndComponents) {
    Map<String, Object> yamlMap;
    StringWriter yamlStr = new StringWriter();
    yamlMap = new LinkedHashMap<>();
    yamlMap.put(StormTopologyLayoutConstants.YAML_KEY_NAME, "topo1");

    for (Map.Entry<String, Map<String, Object>> entry: keysAndComponents) {
        addComponentToCollection(yamlMap, entry.getValue(), entry.getKey());
    }

    DumperOptions options = new DumperOptions();
    options.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK);
    options.setSplitLines(false);
    Yaml yaml = new Yaml (options);
    yaml.dump(yamlMap, yamlStr);
    return yamlStr.toString();
}
 

import com.fasterxml.jackson.dataformat.yaml.snakeyaml.Yaml; //导入方法依赖的package包/类
private Object[] buildParams(Object[] params,
        ServiceSpecification spec, Map<String, Object> serviceConfig) {

    // Add existing params
    List<Object> paramList = new ArrayList<Object>();
    for(int i = 0; i < params.length; ++i)
        paramList.add(params[i]);
    
    // Add any dependency services
    Class<?>[] dependencies = spec.metadata.dependencies();
    for(int i = 0; i < dependencies.length; ++i)
        paramList.add(getService(dependencies[i]));

    // If the service requires a configuration, add it
    Class<?> configClass = spec.metadata.configClass();
    if(configClass != Void.class){
        Yaml yaml = new Yaml();           
        String configString = yaml.dump(serviceConfig);
        Object configObject = yaml.loadAs(configString, configClass);
        paramList.add(configObject);
    }
    
    return paramList.toArray();
}
 

import com.fasterxml.jackson.dataformat.yaml.snakeyaml.Yaml; //导入方法依赖的package包/类
public String toYamlString(Map<String, Object> yamlMap) {
    StringWriter yamlStr = new StringWriter();
    DumperOptions options = new DumperOptions();
    options.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK);
    options.setSplitLines(true);
    options.setPrettyFlow(true);
    Yaml yaml = new Yaml(options);
    yaml.dump(yamlMap, yamlStr);

    return yamlStr.toString();
}
 

import com.fasterxml.jackson.dataformat.yaml.snakeyaml.Yaml; //导入方法依赖的package包/类
@SuppressWarnings("unchecked")
private static void modifyCassandraYaml(
    @NotNull final Marker taskIdMarker,
    @NotNull final String version,
    @NotNull final CassandraServerConfig cassandraServerConfig
) throws IOException {
    LOGGER.info(taskIdMarker, "Building cassandra.yaml");

    final File cassandraYaml = new File("apache-cassandra-" + version + "/conf/cassandra.yaml");

    final Yaml yaml = new Yaml();
    final Map<String, Object> yamlMap;
    LOGGER.info(taskIdMarker, "Reading cassandra.yaml");
    try (BufferedReader br = new BufferedReader(new FileReader(cassandraYaml))) {
        yamlMap = (Map<String, Object>) yaml.load(br);
    }
    LOGGER.info(taskIdMarker, "Modifying cassandra.yaml");
    for (final TaskConfig.Entry entry : cassandraServerConfig.getCassandraYamlConfig().getVariablesList()) {
        switch (entry.getName()) {
            case "seeds":
                final List<Map<String, Object>> seedProviderList = (List<Map<String, Object>>) yamlMap.get("seed_provider");
                final Map<String, Object> seedProviderMap = seedProviderList.get(0);
                final List<Map<String, Object>> parameters = (List<Map<String, Object>>) seedProviderMap.get("parameters");
                final Map<String, Object> parametersMap = parameters.get(0);
                parametersMap.put("seeds", entry.getStringValue());
                break;
            default:
                if (entry.hasStringValue()) {
                    yamlMap.put(entry.getName(), entry.getStringValue());
                } else if (entry.hasLongValue()) {
                    yamlMap.put(entry.getName(), entry.getLongValue());
                } else if (!entry.getStringValuesList().isEmpty()) {
                    yamlMap.put(entry.getName(), entry.getStringValuesList());
                }
        }
    }
    if (LOGGER.isDebugEnabled()) {
        final StringWriter sw = new StringWriter();
        yaml.dump(yamlMap, sw);
        LOGGER.debug("cassandra.yaml result: {}", sw);
    }
    LOGGER.info(taskIdMarker, "Writing cassandra.yaml");
    try (BufferedWriter bw = new BufferedWriter(new FileWriter(cassandraYaml))) {
        yaml.dump(yamlMap, bw);
    }
}