Import code from internal repository to git

java/com/google/domain/registry/util/SerializeUtils.java

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+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// 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.google.domain.registry.util;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.io.BaseEncoding.base16;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+
+import javax.annotation.Nullable;
+
+/** Utilities for easy serialization with informative error messages. */
+public final class SerializeUtils {
+
+  /**
+   * Turns an object into a byte array.
+   *
+   * @return serialized object or {@code null} if {@code value} is {@code null}
+   */
+  @Nullable
+  public static byte[] serialize(@Nullable Object value) {
+    if (value == null) {
+      return null;
+    }
+    ByteArrayOutputStream objectBytes = new ByteArrayOutputStream();
+    try (ObjectOutputStream oos = new ObjectOutputStream(objectBytes)) {
+      oos.writeObject(value);
+    } catch (IOException e) {
+      throw new IllegalArgumentException("Unable to serialize: " + value, e);
+    }
+    return objectBytes.toByteArray();
+  }
+
+  /**
+   * Turns a byte array into an object.
+   *
+   * @return deserialized object or {@code null} if {@code objectBytes} is {@code null}
+   */
+  @Nullable
+  public static <T> T deserialize(Class<T> type, @Nullable byte[] objectBytes) {
+    checkNotNull(type);
+    if (objectBytes == null) {
+      return null;
+    }
+    try {
+      return type.cast(new ObjectInputStream(new ByteArrayInputStream(objectBytes)).readObject());
+    } catch (ClassNotFoundException | IOException e) {
+      throw new IllegalArgumentException(
+          "Unable to deserialize: objectBytes=" + base16().encode(objectBytes), e);
+    }
+  }
+
+  private SerializeUtils() {}
+}