Add NullOutputStream and readDataFromFile

Some benchmarks need some kind of /dev/null output stream. Some others
need to read data from a file.
This CL adds implementations of NullOutputStream and readDataFromFile as
Util.java.

Test: benchmarks_run_target.sh --iterations 1
Change-Id: I7f647d737386553c442493394088b0d38b4d70ea

1 files changed, 54 insertions, 0 deletions

diff --git a/framework/org/linaro/bench/Util.java b/framework/org/linaro/bench/Util.java
new file mode 100644
index 0000000..66ce1a6
--- /dev/null
+++ b/framework/org/linaro/bench/Util.java
@@ -0,0 +1,54 @@
+/*
+ *    Copyright 2019 Linaro Limited
+ *
+ * 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 org.linaro.bench;
+
+import java.io.ByteArrayOutputStream;
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.io.OutputStream;
+
+public class Util {
+  public static final class NullOutputStream extends OutputStream {
+    @Override
+    public void write(int b) throws IOException {
+      // Writes to nowhere
+    }
+  }
+
+  public static String readDataFromFile(final String fileName) {
+    BufferedReader in = null;
+    try {
+      try {
+        in = new BufferedReader(new FileReader(fileName));
+        StringBuilder strBuilder = new StringBuilder(in.readLine());
+        String line;
+        while ((line = in.readLine()) != null) {
+          strBuilder.append('\n').append(line);
+        }
+        return strBuilder.toString();
+      } finally {
+        if (in != null) {
+          in.close();
+        }
+      }
+    } catch (Exception e) {
+      throw new RuntimeException(e);
+    }
+  }
+}