Changeset 9755 in josm for trunk/src/org/openstreetmap/josm/tools/MultiMap.java

Timestamp:

2016-02-08T00:01:48+01:00 (8 years ago)

Author:

bastiK

Message:

add preference type MultiMap (closes #12437)

File:

• trunk/src/org/openstreetmap/josm/tools/MultiMap.java (modified) (3 diffs)

trunk/src/org/openstreetmap/josm/tools/MultiMap.java

@@ -4 +4 @@
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.LinkedHashSet;
@@ -43 +44 @@
 
     /**
+     * Constructs a new {@code MultiMap} from an ordinary {@code Map}.
+     * @param map0 the {@code Map}
+     */
+    public MultiMap(Map<A, Set<B>> map0) {
+        if (map0 == null) {
+            map = new HashMap<>();
+        } else {
+            map = new HashMap<>(Utils.hashMapInitialCapacity(map0.size()));
+            for (Entry<A, Set<B>> e : map0.entrySet()) {
+                map.put(e.getKey(), new LinkedHashSet<>(e.getValue()));
+            }
+        }
+    }
+
+    /**
      * Map a key to a value.
      *
@@ -216 +232 @@
     public int hashCode() {
         return Objects.hash(map);
+    }
+
+    /**
+     * Converts this {@code MultiMap} to a {@code Map} with {@code Set} values.
+     * @return the converted {@code Map}
+     */
+    public Map<A, Set<B>> toMap() {
+        Map<A, Set<B>> result = new HashMap<>();
+        for (Entry<A, Set<B>> e : map.entrySet()) {
+            result.put(e.getKey(), Collections.unmodifiableSet(e.getValue()));
+        }
+        return result;
     }