package org.jboss.resteasy.microprofile.config;

import org.eclipse.microprofile.config.spi.ConfigSource;

import java.util.Collections;
import java.util.Map;
import java.util.Set;

I know this implementation is weird, but we do this for two reasons
1. So that resteasy doesn't require servlet
2. Because Graal VM will barf with an unhandled reference if we reference servlet classes directly
/**
 * I know this implementation is weird, but we do this for two reasons
 * 1. So that resteasy doesn't require servlet
 * 2. Because Graal VM will barf with an unhandled reference if we reference servlet classes directly
 *
 */
public class BaseServletConfigSource implements ConfigSource {
    protected ConfigSource source;
    protected final boolean available;
    protected final int defaultOrdinal;
    private final String name;

    public BaseServletConfigSource(final Class<?> sourceClass, final int defaultOrdinal) {
        this.defaultOrdinal = defaultOrdinal;
        if (sourceClass != null) {
            try {
                source = (ConfigSource)sourceClass.newInstance();
                name = source.getName();
                available = true;
            } catch (Throwable e) {
                throw new RuntimeException(e);
            }
        } else {
            name = toString();
            available = false;
        }
    }

   @Override
   public Map<String, String> getProperties() {
       if (!available) {
          return Collections.<String, String>emptyMap();
       }
       return source.getProperties();
    }

   @Override
   public Set<String> getPropertyNames() {
        return getProperties().keySet();
    }

    @Override
    public int getOrdinal() {
       if (!available) {
          return defaultOrdinal;
       }
       return source.getOrdinal();
   }

   @Override
   public String getValue(String propertyName) {
       if (!available) {
          return null;
       }
       return source.getValue(propertyName);
    }

    @Override
    public String getName() {
       return name;
    }

}