add account manager permission checking

core/java/android/util/Pair.java

@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2009 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.
+ */
+
+package android.util;
+
+/**
+ * Container to ease passing around a tuple of two objects. This object provides a sensible
+ * implementation of equals(), returning true if equals() is true on each of the contained
+ * objects.
+ */
+public class Pair<F, S> {
+    public final F first;
+    public final S second;
+
+    /**
+     * Constructor for a Pair. If either are null then equals() and hashCode() will throw
+     * a NullPointerException.
+     * @param first the first object in the Pair
+     * @param second the second object in the pair
+     */
+    public Pair(F first, S second) {
+        this.first = first;
+        this.second = second;
+    }
+
+    /**
+     * Checks the two objects for equality by delegating to their respective equals() methods.
+     * @param o the Pair to which this one is to be checked for equality
+     * @return true if the underlying objects of the Pair are both considered equals()
+     */
+    public boolean equals(Object o) {
+        if (o == this) return true;
+        if (!(o instanceof Pair)) return false;
+        final Pair<F, S> other;
+        try {
+            other = (Pair<F, S>) o;
+        } catch (ClassCastException e) {
+            return false;
+        }
+        return first.equals(other.first) && second.equals(other.second);
+    }
+
+    /**
+     * Compute a hash code using the hash codes of the underlying objects
+     * @return a hashcode of the Pair
+     */
+    public int hashCode() {
+        int result = 17;
+        result = 31 * result + first.hashCode();
+        result = 31 * result + second.hashCode();
+        return result;
+    }
+
+    /**
+     * Convenience method for creating an appropriately typed pair.
+     * @param a the first object in the Pair
+     * @param b the second object in the pair
+     * @return a Pair that is templatized with the types of a and b
+     */
+    public static <A, B> Pair <A, B> create(A a, B b) {
+        return new Pair<A, B>(a, b);
+    }
+}