Import code from internal repository to git

java/com/google/domain/registry/util/ResourceUtils.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.io.Resources.asByteSource;
+import static com.google.common.io.Resources.getResource;
+import static java.nio.charset.StandardCharsets.UTF_8;
+
+import com.google.common.io.ByteSource;
+import com.google.common.io.Resources;
+
+import java.io.IOException;
+import java.net.URL;
+
+/** Utility methods related to reading java resources. */
+public final class ResourceUtils {
+
+  /** Loads a file as a string, assuming UTF-8 encoding. */
+  public static String readResourceUtf8(String filename) {
+    return resourceToString(getResource(filename));
+  }
+
+  /** Loads a file (specified relative to the contextClass) as a string, assuming UTF-8 encoding. */
+  public static String readResourceUtf8(Class<?> contextClass, String filename) {
+    return resourceToString(getResource(contextClass, filename));
+  }
+
+  private static String resourceToString(URL url) {
+    try {
+      return Resources.toString(url, UTF_8);
+    } catch (IOException e) {
+      throw new IllegalArgumentException("Failed to load resource: " + url, e);
+    }
+  }
+
+  /** Loads a file (specified relative to the contextClass) as a ByteSource. */
+  public static ByteSource readResourceBytes(Class<?> contextClass, String filename) {
+    return asByteSource(getResource(contextClass, filename));
+  }
+}