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

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

import org.litesoft.core.typeutils.*;
import org.litesoft.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
    {
        Objects.assertNotNull( "LoadedFromDirectory", pLoadedFromDirectory );
        Objects.assertNotNull( "LoadedFromName", pLoadedFromName );
        Objects.assertNotNull( "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 Utils.toStringArray( mProperties.keySet() );
        }

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