Move several files out of Util.

[DictionaryPC.git] / src / com / hughes / util / MapUtil.java

diff --git a/src/com/hughes/util/MapUtil.java b/src/com/hughes/util/MapUtil.java
new file mode 100644 (file)
index 0000000..a62a86e
--- /dev/null
+++ b/src/com/hughes/util/MapUtil.java
@@ -0,0 +1,55 @@
+// Copyright 2011 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.hughes.util;
+
+import java.util.Map;
+
+@SuppressWarnings({"WeakerAccess", "unused"})
+public class MapUtil {
+
+    public static <K,V> V safeGet(final Map<K,V> map, K key, V defaultValue) {
+        if (!map.containsKey(key)) {
+            return defaultValue;
+        }
+        return map.get(key);
+    }
+
+    public static <K,V> V safeGetOrPut(final Map<K,V> map, K key, V defaultValue) {
+        if (!map.containsKey(key)) {
+            map.put(key, defaultValue);
+        }
+        return map.get(key);
+    }
+
+    public static <K,V> V safeGet(final Map<K,V> map, K key, Class<V> valueClass) {
+        if (!map.containsKey(key)) {
+            try {
+                map.put(key, valueClass.newInstance());
+            } catch (Exception e) {
+                throw new RuntimeException(e);
+            }
+        }
+        return map.get(key);
+    }
+
+    public static <K,V> V safeRemove(final Map<K,V> map, K key, V defaultValue) {
+        if (!map.containsKey(key)) {
+            return defaultValue;
+        }
+        return map.remove(key);
+    }
+
+
+}