// This Source Code is in the Public Domain per: http://unlicense.org
package org.litesoft.configuration;

import org.litesoft.commonfoundation.base.*;
import org.litesoft.commonfoundation.typeutils.*;

import java.io.*;
import java.util.*;

public class ConfigAccessorFactoryProperties implements ConfigAccessorFactory {
    public static final ConfigAccessorFactory INSTANCE = new ConfigAccessorFactoryProperties();

    private ConfigAccessorFactoryProperties() {
    }

    @Override
    public ConfigDataAccessor create( String pLoadedFromDirectory, String pLoadedFromName, InputStream pInputStream )
            throws IOException {
        Confirm.isNotNull( "LoadedFromDirectory", pLoadedFromDirectory );
        Confirm.isNotNull( "LoadedFromName", pLoadedFromName );
        Confirm.isNotNull( "InputStream", pInputStream );
        Properties props = new Properties();
        props.load( pInputStream );

        return new ConfigDataAccessorImpl( pLoadedFromDirectory, pLoadedFromName, props );
    }

    private static class ConfigDataAccessorImpl extends AbstractConfigDataAccessor {
        private final Properties mProperties;

        public ConfigDataAccessorImpl( String pLoadedFromDirectory, String pLoadedFromName, Properties pProperties ) {
            super( pLoadedFromDirectory, pLoadedFromName + " from '" + pLoadedFromDirectory + "'", null );
            mProperties = pProperties;
        }

        @Override
        protected String getExceptionPlus() {
            return " Properties";
        }

        @Override
        protected void setOtherLevelKeyValue( String pKey, String pValue ) {
            throw new IllegalStateException( "Huh" );
        }

        @Override
        protected String[] getBaseKeys() {
            return Strings.toArray( mProperties.keySet() );
        }

        @Override
        protected String getBaseValue( String pKey ) {
            Object o = mProperties.get( pKey );
            return (o == null) ? null : o.toString();
        }
    }
}