Added value class wrapping timestamped values

Author: jmhofer

rxjava-core/src/main/java/rx/util/Timestamped.java

@@ -0,0 +1,56 @@
+package rx.util;
+
+/**
+ * Composite class that takes a value and a timestamp and wraps them.   
+ */
+public final class Timestamped<T> {
+    private final long timestampMillis;
+    private final T value;
+
+    public Timestamped(long timestampMillis, T value) {
+        this.value = value;
+        this.timestampMillis = timestampMillis;
+    }
+
+    public long getTimestampMillis() {
+        return timestampMillis;
+    }
+
+    public T getValue() {
+        return value;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (!(obj instanceof Timestamped)) {
+            return false;
+        }
+        Timestamped<?> other = (Timestamped<?>) obj;
+        if (timestampMillis != other.timestampMillis) {
+            return false;
+        }
+        if (value == null) {
+            if (other.value != null) {
+                return false;
+            }
+        } else if (!value.equals(other.value)) {
+            return false;
+        }
+        return true;
+    }
+    
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + (int) (timestampMillis ^ (timestampMillis));
+        result = prime * result + ((value == null) ? 0 : value.hashCode());
+        return result;
+    }
+}