package com.student.bizImpl;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.Key;
import java.util.Properties;

import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
import org.springframework.core.io.Resource;
import org.springframework.util.DefaultPropertiesPersister;
import org.springframework.util.PropertiesPersister;

import com.student.uilt.DESEncryptUtil;


public class DecryptPropertyPlaceholderConfigurer extends
        PropertyPlaceholderConfigurer
{
    private Resource[] locations;
    
    private Resource keyLocation;
    
    private String fileEncoding;
    
    public void setKeyLocation(Resource keyLocation)
    {
        this.keyLocation = keyLocation;
    }
    
    public void setLocations(Resource[] locations)
    {
        this.locations = locations;
    }
    
    public void loadProperties(Properties props) throws IOException
    {
        if (this.locations != null)
        {
            PropertiesPersister propertiesPersister = new DefaultPropertiesPersister();
            for (int i = 0; i < this.locations.length; i++)
            {
                Resource location = this.locations[i];
                if (logger.isInfoEnabled())
                {
                    logger.info("Loading properties file from " + location);
                }
                InputStream is = null;
                try
                {
                    is = location.getInputStream();
                    Key key = DESEncryptUtil.getKey(keyLocation.getInputStream());
                    is = DESEncryptUtil.doDecrypt(key, is);
                    if (fileEncoding != null)
                    {
                        propertiesPersister.load(props, new InputStreamReader(
                                is, fileEncoding));
                    }
                    else
                    {
                        propertiesPersister.load(props, is);
                    }
                }
                finally
                {
                    if (is != null)
                    {
                        is.close();
                    }
                }
            }
        }
    }
}