Changeset 8 in josm for src/org/openstreetmap/josm/data/osm/Key.java

Timestamp:

2005-10-03T04:18:02+02:00 (19 years ago)

Author:

imi

Message:

• added Selection Dialog
• added support for graphic engines with a better default engine
• reorganized data classes with back references

File:

• src/org/openstreetmap/josm/data/osm/Key.java (modified) (3 diffs)

src/org/openstreetmap/josm/data/osm/Key.java

@@ -2 +2 @@
 
 import java.util.Collection;
+import java.util.HashMap;
 import java.util.LinkedList;
+import java.util.Map;
+
+import org.openstreetmap.josm.data.osm.visitor.Visitor;
 
 
@@ -15 +19 @@
          * The key's name
          */
-        public String name;
+        public final String name;
 
+        /**
+         * All keys are stored here.
+         */
+        private static Map<String, Key> allKeys = new HashMap<String, Key>();
+        
+        /**
+         * Generate a key with the given name. You cannot call this directly but
+         * have to use the static constructor. This makes sure, you get every key
+         * only once.
+         */
+        private Key(String name) {
+                this.name = name;
+        }
+
+        /**
+         * Get an instance of the key with the given name.
+         * @param name  The name of the key to get.
+         * @return An shared instance of the key with the given name. 
+         */
+        public static Key get(String name) {
+                Key key = allKeys.get(name);
+                if (key == null) {
+                        key = new Key(name);
+                        allKeys.put(name, key);
+                }
+                return key;
+        }
+        
         /**
          * Return an empty list, since keys cannot have nodes. 
@@ -39 +71 @@
                 return name.hashCode();
         }
+
+        @Override
+        public void visit(Visitor visitor) {
+                visitor.visit(this);
+        }
 }