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1   package ca.uhn.hl7v2.conf.store;
2   
3   import java.io.BufferedReader;
4   import java.io.BufferedWriter;
5   import java.io.File;
6   import java.io.FileReader;
7   import java.io.FileWriter;
8   import java.io.IOException;
9   
10  import org.slf4j.Logger;
11  import org.slf4j.LoggerFactory;
12  
13  /**
14   * Stores profiles in a local directory.  Profiles are stored as text
15   * in files named ID.xml (where ID is the profile ID).
16   * 
17   * @author Bryan Tripp
18   */
19  public class FileProfileStore implements ProfileStore {
20      
21      private File root;
22      private static final Logger log = LoggerFactory.getLogger(FileProfileStore.class);
23      
24      /** Creates a new instance of FileProfileStore */
25      public FileProfileStore(String theFile) {
26          root = new File(theFile);
27          if (root.exists()) {
28  	        if (!root.isDirectory()) {
29  	            log.warn("Profile store is not a directory (won't be able to retrieve any profiles): {}", theFile);
30  	        }
31          } else {
32          	log.debug("Profile store directory doesn't exist: {}", theFile);
33          }
34      }
35      
36      /**
37       * Retrieves profile from persistent storage (by ID).  Returns null
38       * if the profile isn't found.
39       */
40      public String getProfile(String theID) throws IOException {
41          String profile = null;
42          
43          String fileName = getFileName(theID);
44  		File source = new File(fileName);
45          if (!source.exists()) {
46          	log.debug("File for profile {} doesn't exist: {}", theID, fileName);
47          } else if (source.isFile()) {
48              BufferedReader in = new BufferedReader(new FileReader(source));
49              char[] buf = new char[(int) source.length()];
50              int check = in.read(buf, 0, buf.length);
51              in.close();
52              if (check != buf.length)
53                  throw new IOException("Only read " + check + " of " + buf.length
54                  + " bytes of file " + source.getAbsolutePath());
55              profile = new String(buf);
56              log.debug("Got profile {}: \r\n {}", theID, profile);
57          }
58          return profile;
59      }
60      
61      /**
62       * Stores profile in persistent storage with given ID.
63       */
64      public void persistProfile(String ID, String profile) throws IOException {
65          if (!root.exists()) {
66          	throw new IOException("Can't persist profile. Directory doesn't exist: " + root.getAbsolutePath());
67          }
68          if (!root.isDirectory()) {
69          	throw new IOException("Can't persist profile. Not a directory: " + root.getAbsolutePath());
70          }
71      	
72      	File dest = new File(getFileName(ID));
73          BufferedWriter out = new BufferedWriter(new FileWriter(dest));
74          out.write(profile);
75          out.flush();
76          out.close();
77      }
78      
79      private String getFileName(String ID) {
80          return root.getAbsolutePath() + "/" + ID + ".xml";
81      }
82  }