Extracting out CacheKey to a separate class

Change-Id: Ifdd7cc79668b34298e3f788ee684080cecb86c3e

src/com/android/launcher3/util/ComponentKey.java

@@ -0,0 +1,51 @@
+package com.android.launcher3.util;
+
+/**
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * 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.
+ */
+
+import android.content.ComponentName;
+
+import com.android.launcher3.compat.UserHandleCompat;
+
+import java.util.Arrays;
+
+public class ComponentKey {
+
+    public final ComponentName componentName;
+    public final UserHandleCompat user;
+
+    private final int mHashCode;
+
+    public ComponentKey(ComponentName componentName, UserHandleCompat user) {
+        assert (componentName != null);
+        assert (user != null);
+        this.componentName = componentName;
+        this.user = user;
+        mHashCode = Arrays.hashCode(new Object[] {componentName, user});
+
+    }
+
+    @Override
+    public int hashCode() {
+        return mHashCode;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        ComponentKey other = (ComponentKey) o;
+        return other.componentName.equals(componentName) && other.user.equals(user);
+    }
+}