Add MemoryAvatarMetadataStore

smack-extensions/src/main/java/org/jivesoftware/smackx/avatar/MemoryAvatarMetadataStore.java

@@ -0,0 +1,68 @@
+package org.jivesoftware.smackx.avatar;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.jivesoftware.smack.util.HashCode;
+import org.jivesoftware.smack.util.Objects;
+
+import org.jxmpp.jid.EntityBareJid;
+
+public class MemoryAvatarMetadataStore implements AvatarMetadataStore {
+
+    private Map<Tuple<EntityBareJid, String>, Boolean> availabilityMap = new ConcurrentHashMap<>();
+
+    @Override
+    public boolean hasAvatarAvailable(EntityBareJid jid, String itemId) {
+        Boolean available = availabilityMap.get(new Tuple<>(jid, itemId));
+        return available != null && available;
+    }
+
+    @Override
+    public void setAvatarAvailable(EntityBareJid jid, String itemId) {
+        availabilityMap.put(new Tuple<>(jid, itemId), Boolean.TRUE);
+    }
+
+    private static class Tuple<A, B> {
+        private final A first;
+        private final B second;
+
+        public Tuple(A first, B second) {
+            this.first = first;
+            this.second = second;
+        }
+
+        public A getFirst() {
+            return first;
+        }
+
+        public B getSecond() {
+            return second;
+        }
+
+        @Override
+        public int hashCode() {
+            return HashCode.builder()
+                    .append(first)
+                    .append(second)
+                    .build();
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+            if (obj == null) {
+                return false;
+            }
+            if (obj == this) {
+                return true;
+            }
+            if (!(obj instanceof Tuple)) {
+                return false;
+            }
+
+            @SuppressWarnings("unchecked") Tuple<A, B> other = (Tuple<A, B>) obj;
+            return Objects.equals(getFirst(), other.getFirst())
+                    && Objects.equals(getSecond(), other.getSecond());
+        }
+    }
+}