package ca.uhn.hl7v2.conf.store;

 import java.io.BufferedReader;

 import java.io.BufferedWriter;

 import java.io.File;

 import java.io.FileReader;

 import java.io.FileWriter;

 import java.io.IOException;

 import org.slf4j.Logger;

 import org.slf4j.LoggerFactory;

 /**

  * Stores profiles in a local directory.  Profiles are stored as text

  * in files named ID.xml (where ID is the profile ID).

  * 

  * @author Bryan Tripp

  */

 public class FileProfileStore implements ProfileStore {

     private File root;

     private static final Logger log = LoggerFactory.getLogger(FileProfileStore.class);

     /** Creates a new instance of FileProfileStore */

     public FileProfileStore(String theFile) {

         root = new File(theFile);

         if (root.exists()) {

                 if (!root.isDirectory()) {

                     log.warn("Profile store is not a directory (won't be able to retrieve any profiles): {}", theFile);

                 }

         } else {

                 log.debug("Profile store directory doesn't exist: {}", theFile);

         }

     }

     /**

      * Retrieves profile from persistent storage (by ID).  Returns null

      * if the profile isn't found.

      */

     public String getProfile(String theID) throws IOException {

         String profile = null;

         String fileName = getFileName(theID);

                 File source = new File(fileName);

         if (!source.exists()) {

                 log.debug("File for profile {} doesn't exist: {}", theID, fileName);

         } else if (source.isFile()) {

             BufferedReader in = new BufferedReader(new FileReader(source));

             char[] buf = new char[(int) source.length()];

             int check = in.read(buf, 0, buf.length);

             in.close();

             if (check != buf.length)

                 throw new IOException("Only read " + check + " of " + buf.length

                 + " bytes of file " + source.getAbsolutePath());

             profile = new String(buf);

             log.debug("Got profile {}: \r\n {}", theID, profile);

         }

         return profile;

     }

     /**

      * Stores profile in persistent storage with given ID.

      */

     public void persistProfile(String ID, String profile) throws IOException {

         if (!root.exists()) {

                 throw new IOException("Can't persist profile. Directory doesn't exist: " + root.getAbsolutePath());

         }

         if (!root.isDirectory()) {

                 throw new IOException("Can't persist profile. Not a directory: " + root.getAbsolutePath());

         }

             File dest = new File(getFileName(ID));

         BufferedWriter out = new BufferedWriter(new FileWriter(dest));

         out.write(profile);

         out.flush();

         out.close();

     }

     private String getFileName(String ID) {

         return root.getAbsolutePath() + "/" + ID + ".xml";

     }

 }