com.manywho.sdk.services.configuration.ConfigurationRepository Maven / Gradle / Ivy

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package com.manywho.sdk.services.configuration;

import org.reflections.Reflections;

import javax.inject.Inject;
import java.lang.reflect.Field;
import java.util.Set;
import java.util.stream.Collectors;

public class ConfigurationRepository {
    private final Reflections reflections;

    private Set configurationSettings;

    @Inject
    public ConfigurationRepository(Reflections reflections) {
        this.reflections = reflections;
    }

    public Class getConfigurationClass() {
        Set> configurationClasses = reflections.getSubTypesOf(Configuration.class);

        if (configurationClasses.isEmpty()) {
            throw new RuntimeException("No class implementing " + Configuration.class.getCanonicalName() + " was found");
        }

        if (configurationClasses.size() > 1) {
            throw new RuntimeException("More than one class implementing " + Configuration.class.getCanonicalName() + " was found - only a single implementation is currently supported");
        }

        return configurationClasses.iterator().next();
    }

    public Set getConfigurationSettings() {
        if (configurationSettings == null) {
            configurationSettings = reflections.getFieldsAnnotatedWith(Configuration.Setting.class);
        }

        return configurationSettings;
    }

    public Set findConfigurationSettings(Class configurationClass) {
        return getConfigurationSettings().stream()
                .filter(annotation -> annotation.getDeclaringClass().equals(configurationClass))
                .collect(Collectors.toSet());
    }
}