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A config module for rule-engine based response transformer.
There is a newer version: 2.1.37
package com.networknt.restrans;

import com.fasterxml.jackson.core.type.TypeReference;
import com.networknt.config.Config;
import com.networknt.config.ConfigException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

public class ResponseTransformerConfig {
    public static final String CONFIG_NAME = "response-transformer";
    private static final Logger logger = LoggerFactory.getLogger(ResponseTransformerConfig.class);

    private static final String ENABLED = "enabled";
    private static final String REQUIRED_CONTENT = "requiredContent";
    private static final String DEFAULT_BODY_ENCODING = "defaultBodyEncoding";
    private static final String APPLIED_PATH_PREFIXES = "appliedPathPrefixes";

    private Map mappedConfig;
    private Config config;
    private boolean enabled;
    private boolean requiredContent;
    private String defaultBodyEncoding;
    List appliedPathPrefixes;

    private ResponseTransformerConfig() {
        this(CONFIG_NAME);
    }

    private ResponseTransformerConfig(String configName) {
        config = Config.getInstance();
        mappedConfig = config.getJsonMapConfigNoCache(configName);
        setConfigData();
        setConfigList();
    }

    public static ResponseTransformerConfig load() {
        return new ResponseTransformerConfig();
    }

    public static ResponseTransformerConfig load(String configName) {
        return new ResponseTransformerConfig(configName);
    }

    public void reload() {
        mappedConfig = config.getJsonMapConfigNoCache(CONFIG_NAME);
        setConfigData();
        setConfigList();
    }


    public boolean isEnabled() {
        return enabled;
    }
    public boolean isRequiredContent() { return requiredContent; }
    public String getDefaultBodyEncoding() { return defaultBodyEncoding; }
    public List getAppliedPathPrefixes() {
        return appliedPathPrefixes;
    }

    public Map getMappedConfig() {
        return mappedConfig;
    }

    private void setConfigData() {
        Object object = mappedConfig.get(ENABLED);
        if(object != null) {
            if(object instanceof String) {
                enabled = Boolean.parseBoolean((String)object);
            } else if (object instanceof Boolean) {
                enabled = (Boolean) object;
            } else {
                throw new ConfigException("enabled must be a boolean value.");
            }
        }
        object = mappedConfig.get(REQUIRED_CONTENT);
        if(object != null) {
            if(object instanceof String) {
                requiredContent = Boolean.parseBoolean((String)object);
            } else if (object instanceof Boolean) {
                requiredContent = (Boolean) object;
            } else {
                throw new ConfigException("requiredContent must be a boolean value.");
            }
        }
        object = mappedConfig.get(DEFAULT_BODY_ENCODING);
        if (object != null) defaultBodyEncoding = (String) object;
    }

    private void setConfigList() {
        if (mappedConfig.get(APPLIED_PATH_PREFIXES) != null) {
            Object object = mappedConfig.get(APPLIED_PATH_PREFIXES);
            appliedPathPrefixes = new ArrayList<>();
            if(object instanceof String) {
                String s = (String)object;
                s = s.trim();
                if(logger.isTraceEnabled()) logger.trace("s = " + s);
                if(s.startsWith("[")) {
                    // json format
                    try {
                        appliedPathPrefixes = Config.getInstance().getMapper().readValue(s, new TypeReference>() {});
                    } catch (Exception e) {
                        throw new ConfigException("could not parse the appliedPathPrefixes json with a list of strings.");
                    }
                } else {
                    // comma separated
                    appliedPathPrefixes = Arrays.asList(s.split("\\s*,\\s*"));
                }
            } else if (object instanceof List) {
                List prefixes = (List)object;
                prefixes.forEach(item -> {
                    appliedPathPrefixes.add((String)item);
                });
            } else {
                throw new ConfigException("appliedPathPrefixes must be a string or a list of strings.");
            }
        }
    }

}