src/jalview/io/JalviewFileFilter.java

   1 package jalview.io;\r
   2 \r
   3 import javax.swing.filechooser.*;\r
   4 import java.io.File;\r
   5 import java.util.*;\r
   6 \r
   7 public class JalviewFileFilter extends FileFilter\r
   8 {\r
   9       private static String TYPE_UNKNOWN = "Type Unknown";\r
  10       private static String HIDDEN_FILE = "Hidden File";\r
  11       public static Hashtable suffixHash = new Hashtable();\r
  12 \r
  13       private Hashtable filters = null;\r
  14       private String description = "no description";\r
  15       private String fullDescription = "full description";\r
  16       private boolean useExtensionsInDescription = true;\r
  17 \r
  18       public JalviewFileFilter() {\r
  19           this.filters = new Hashtable();\r
  20       }\r
  21 \r
  22       public JalviewFileFilter(String extension) {\r
  23           this(extension,null);\r
  24       }\r
  25 \r
  26       public JalviewFileFilter(String extension, String description) {\r
  27           this();\r
  28           if(extension!=null) addExtension(extension);\r
  29            if(description!=null) setDescription(description);\r
  30       }\r
  31 \r
  32       public JalviewFileFilter(String[] filts) {\r
  33           this(filts, null);\r
  34       }\r
  35 \r
  36       public JalviewFileFilter(String[] filts, String description) {\r
  37           this();\r
  38           for (int i = 0; i < filts.length; i++) {\r
  39               // add filters one by one\r
  40               addExtension(filts[i]);\r
  41           }\r
  42            if(description!=null) setDescription(description);\r
  43       }\r
  44 \r
  45       // takes account of the fact that database is a directory\r
  46       public boolean accept(File f) {\r
  47           if(f != null) {\r
  48               String extension = getExtension(f);\r
  49               if(f.isDirectory()) {\r
  50                  if(extension == null || extension.equals("")) {\r
  51                     return true;\r
  52                  } else {\r
  53                     if(filters.get(getExtension(f)) != null) {\r
  54                        return true;\r
  55                     }\r
  56                  }\r
  57               }\r
  58               if(extension != null && filters.get(getExtension(f)) != null) {\r
  59                   return true;\r
  60               }\r
  61           }\r
  62           return false;\r
  63       }\r
  64 \r
  65        public String getExtension(File f) {\r
  66           if(f != null) {\r
  67               String filename = f.getName();\r
  68               int i = filename.lastIndexOf('.');\r
  69               if(i>0 && i<filename.length()-1) {\r
  70                   return filename.substring(i+1).toLowerCase();\r
  71               };\r
  72           }\r
  73           return "";\r
  74       }\r
  75 \r
  76       public void addExtension(String extension) {\r
  77           if(filters == null) {\r
  78               filters = new Hashtable(5);\r
  79           }\r
  80           filters.put(extension.toLowerCase(), this);\r
  81           fullDescription = null;\r
  82       }\r
  83 \r
  84 \r
  85       public String getDescription() {\r
  86           if(fullDescription == null) {\r
  87               if(description == null || isExtensionListInDescription()) {\r
  88                    fullDescription = description==null ? "(" : description + " (";\r
  89                   // build the description from the extension list\r
  90                   Enumeration extensions = filters.keys();\r
  91                   if(extensions != null) {\r
  92                       fullDescription += "." + (String) extensions.nextElement();\r
  93                       while (extensions.hasMoreElements()) {\r
  94                           fullDescription += ", " + (String) extensions.nextElement();\r
  95                       }\r
  96                   }\r
  97                   fullDescription += ")";\r
  98               } else {\r
  99                   fullDescription = description;\r
 100               }\r
 101           }\r
 102           return fullDescription;\r
 103       }\r
 104 \r
 105       public void setDescription(String description) {\r
 106           this.description = description;\r
 107           fullDescription = null;\r
 108       }\r
 109 \r
 110       public void setExtensionListInDescription(boolean b) {\r
 111           useExtensionsInDescription = b;\r
 112           fullDescription = null;\r
 113       }\r
 114 \r
 115       public boolean isExtensionListInDescription() {\r
 116           return useExtensionsInDescription;\r
 117       }\r
 118   }\r