1 files changed, 107 insertions, 0 deletions
diff --git a/common/src/com/android/utils/Pair.java b/common/src/com/android/utils/Pair.java
new file mode 100644
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+++ b/common/src/com/android/utils/Pair.java
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+/*
+ * Copyright (C) 2010 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 com.android.utils;
+
+/**
+ * A Pair class is simply a 2-tuple for use in this package. We might want to
+ * think about adding something like this to a more central utility place, or
+ * replace it by a common tuple class if one exists, or even rewrite the layout
+ * classes using this Pair by a more dedicated data structure (so we don't have
+ * to pass around generic signatures as is currently done, though at least the
+ * construction is helped a bit by the {@link #of} factory method.
+ *
+ * @param <S> The type of the first value
+ * @param <T> The type of the second value
+ */
+public class Pair<S,T> {
+    private final S mFirst;
+    private final T mSecond;
+
+    // Use {@link Pair#of} factory instead since it infers generic types
+    private Pair(S first, T second) {
+        this.mFirst = first;
+        this.mSecond = second;
+    }
+
+    /**
+     * Return the first item in the pair
+     *
+     * @return the first item in the pair
+     */
+    public S getFirst() {
+        return mFirst;
+    }
+
+    /**
+     * Return the second item in the pair
+     *
+     * @return the second item in the pair
+     */
+    public T getSecond() {
+        return mSecond;
+    }
+
+    /**
+     * Constructs a new pair of the given two objects, inferring generic types.
+     *
+     * @param first the first item to store in the pair
+     * @param second the second item to store in the pair
+     * @param <S> the type of the first item
+     * @param <T> the type of the second item
+     * @return a new pair wrapping the two items
+     */
+    public static <S,T> Pair<S,T> of(S first, T second) {
+        return new Pair<S,T>(first,second);
+    }
+
+    @Override
+    public String toString() {
+        return "Pair [first=" + mFirst + ", second=" + mSecond + "]";
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((mFirst == null) ? 0 : mFirst.hashCode());
+        result = prime * result + ((mSecond == null) ? 0 : mSecond.hashCode());
+        return result;
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        Pair other = (Pair) obj;
+        if (mFirst == null) {
+            if (other.mFirst != null)
+                return false;
+        } else if (!mFirst.equals(other.mFirst))
+            return false;
+        if (mSecond == null) {
+            if (other.mSecond != null)
+                return false;
+        } else if (!mSecond.equals(other.mSecond))
+            return false;
+        return true;
+    }
+}