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   1 /*
   2  * (c) Copyright IBM Corp. 2000, 2001.
   3  * All Rights Reserved.
   4  */
   5 package net.sourceforge.phpdt.internal.corext.template;
   6
   7 import java.util.HashMap;
   8 import java.util.Iterator;
   9 import java.util.Map;
  10
  11 import net.sourceforge.phpdt.internal.corext.template.php.HTMLContextType;
  12 import net.sourceforge.phpdt.internal.corext.template.php.PHPContextType;
  13 import net.sourceforge.phpdt.internal.corext.template.php.PHPDocContextType;
  14
  15
  16
  17 /**
  18  * A singleton to keep track of all known context types.
  19  */
  20 public class ContextTypeRegistry {
  21
  22         /** the singleton */
  23         private static ContextTypeRegistry fInstance;
  24
  25         /** all known context types */
  26         private final Map fContextTypes= new HashMap();
  27
  28         /**
  29          * Returns the single instance of this class.
  30          */
  31         public static ContextTypeRegistry getInstance() {
  32                 if (fInstance == null)
  33                         fInstance= new ContextTypeRegistry();
  34
  35                 return fInstance;
  36         }
  37
  38         /**
  39          * Adds a context type to the registry.
  40          */
  41         public void add(ContextType contextType) {
  42                 fContextTypes.put(contextType.getName(), contextType);
  43         }
  44
  45         /**
  46          * Removes a context type from the registry.
  47          */
  48         public void remove(ContextType contextType) {
  49                 fContextTypes.remove(contextType.getName());
  50         }
  51
  52         /**
  53          * Returns the context type if the name is valid, <code>null</code> otherwise.
  54          */
  55         public ContextType getContextType(String name) {
  56                 return (ContextType) fContextTypes.get(name);
  57         }
  58
  59         /**
  60          * Returns an iterator over the registered context type names.
  61          */
  62         public Iterator iterator() {
  63                 return fContextTypes.keySet().iterator();
  64         }
  65
  66         // XXX bootstrap with java and javadoc context types
  67         private ContextTypeRegistry() {
  68                 add(new PHPContextType());
  69     add(new PHPDocContextType());
  70                 add(new HTMLContextType());
  71         }
  72
  73 }