Implement java.util.Objects

classpath/java/util/Objects.java

@@ -0,0 +1,64 @@
+package java.util;
+
+public final class Objects {
+  private Objects() {
+    throw new AssertionError("Instantiating java.long.Objetcs is not allowed!");
+  }
+
+  public static <T> int compare(final T x, final T y, final Comparator<? super T> comparator) {
+    if (x == y)
+      return 0;
+    else
+      return comparator.compare(x, y);
+  }
+
+  public static boolean deepEquals(final Object x, final Object y) {
+    if (x == y)
+      return true;
+    if (x == null || y == null)
+      return false;
+    throw new UnsupportedOperationException("deepEquals is not implemented yet.");
+  }
+
+  public static boolean equals(final Object x, final Object y) {
+    if (x == y)
+      return true;
+    if (x != null)
+      return x.equals(y);
+    return false;
+  }
+
+  public static int hash(final Object... values) {
+    return Arrays.hashCode(values);
+  }
+
+  public static int hashCode(final Object value) {
+    if (value == null)
+      return 0;
+    return value.hashCode();
+  }
+
+  public static <T> T requireNonNull(final T value) {
+    if (value == null)
+      throw new NullPointerException();
+    else
+      return value;
+  }
+
+  public static <T> T requireNonNull(final T value, String message) {
+    if (value == null)
+      throw new NullPointerException(message);
+    else
+      return value;
+  }
+
+  public static String toString(final Object value) {
+    return String.valueOf(value);
+  }
+
+  public static String toString(final Object value, final String defaultValue) {
+    if (value == null)
+      return defaultValue;
+    return value.toString();
+  }
+}