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/**
 * This class wraps a set of {@link ConfigProvider} instances and uses them to perform
 * transformations.
 */
public class ConfigTransformer {
    private static final Pattern DEFAULT_PATTERN = Pattern.compile("\\$\\{(.*?):((.*?):)?(.*?)\\}");

    private final Map<String, ConfigProvider> configProviders;
    private final Pattern pattern;

    public ConfigTransformer(Map<String, ConfigProvider> configProviders) {
        this(configProviders, DEFAULT_PATTERN);
    }

    public ConfigTransformer(Map<String, ConfigProvider> configProviders, Pattern pattern) {
        this.configProviders = configProviders;
        this.pattern = pattern;
    }

    public Map<String, String> transform(Map<String, String> configs, ConfigChangeCallback callback) {
        ...
    }
}