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   1 package org.collectionspace.services.id.part;
   2
   3 import java.util.IllegalFormatException;
   4 import java.io.PrintWriter;
   5 import java.io.StringWriter;
   6
   7 // Uses Java's interpreter for printf-style format strings.
   8 // http://java.sun.com/javase/1.6/docs/api/java/util/Formatter.html
   9
  10 public class JavaPrintfIDPartOutputFormatter implements IDPartOutputFormatter {
  11
  12     StringWriter stringwriter = new StringWriter();
  13     private int maxOutputLength = DEFAULT_MAX_OUTPUT_LENGTH;
  14     private String formatPattern;
  15
  16     public JavaPrintfIDPartOutputFormatter () {
  17     }
  18
  19     @Override
  20     public int getMaxOutputLength () {
  21         return this.maxOutputLength;
  22     }
  23
  24     public void setMaxOutputLength (int length) {
  25         this.maxOutputLength = length;
  26     }
  27
  28     @Override
  29     public String getFormatPattern () {
  30         return this.formatPattern;
  31     }
  32
  33     public void setFormatPattern(String pattern) {
  34         this.formatPattern = pattern;
  35     }
  36
  37     @Override
  38     public String format(String id) {
  39
  40         String formattedID = id;
  41
  42         String pattern = getFormatPattern();
  43
  44         // If the formatting pattern is empty, just check length.
  45         if (pattern == null || pattern.trim().isEmpty()) {
  46             isValidLength(formattedID);
  47
  48         // Otherwise, format the ID using the pattern, then check length.
  49         } else {
  50             // Clear the StringWriter's buffer from its last usage.
  51             StringBuffer buf = stringwriter.getBuffer();
  52             buf.setLength(0);
  53             // Apply the formatting pattern to the ID.
  54             try {
  55                 PrintWriter printwriter = new PrintWriter(stringwriter);
  56                 printwriter.printf(id, pattern);
  57                 formattedID = stringwriter.toString();
  58             } catch(IllegalFormatException e) {
  59                 // @TODO Log and handle this exception.
  60             }
  61             isValidLength(formattedID);
  62         }
  63
  64         return formattedID;
  65     }
  66
  67     // Check whether the formatted ID exceeds the specified maximum length.
  68
  69     private void isValidLength(String id) {
  70         if (id.length() > getMaxOutputLength()) {
  71             // @TODO Log error, possibly throw exception.
  72         }
  73
  74     }
  75
  76 }
  77