1 files changed, 57 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/util/ResourceFileLoader.java b/src/main/java/com/google/devtools/build/lib/util/ResourceFileLoader.java
new file mode 100644
index 0000000000..ce26c6c8a8
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+++ b/src/main/java/com/google/devtools/build/lib/util/ResourceFileLoader.java
@@ -0,0 +1,57 @@
+// Copyright 2014 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.devtools.build.lib.util;
+
+import static java.nio.charset.StandardCharsets.UTF_8;
+
+import com.google.common.io.ByteStreams;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * A little utility to load resources (property files) from jars or
+ * the classpath. Recommended for longer texts that do not fit nicely into
+ * a piece of Java code - e.g. a template for a lengthy email.
+ */
+public final class ResourceFileLoader {
+
+  private ResourceFileLoader() {}
+
+  /**
+   * Loads a text resource that is located in a directory on the Java classpath that
+   * corresponds to the package of <code>relativeToClass</code> using UTF8 encoding.
+   * E.g.
+   * <code>loadResource(Class.forName("com.google.foo.Foo", "bar.txt"))</code>
+   * will look for <code>com/google/foo/bar.txt</code> in the classpath.
+   */
+  public static String loadResource(Class<?> relativeToClass, String resourceName)
+      throws IOException {
+    ClassLoader loader = relativeToClass.getClassLoader();
+    // TODO(bazel-team): use relativeToClass.getPackage().getName().
+    String className = relativeToClass.getName();
+    String packageName = className.substring(0, className.lastIndexOf('.'));
+    String path = packageName.replace('.', '/');
+    String resource = path + '/' + resourceName;
+    InputStream stream = loader.getResourceAsStream(resource);
+    if (stream == null) {
+      throw new IOException(resourceName + " not found.");
+    }
+    try {
+      return new String(ByteStreams.toByteArray(stream), UTF_8);
+    } finally {
+      stream.close();
+    }
+  }
+}