Add LcovMerger.

(series 2/4 of open-sourcing coverage command for java test)

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PiperOrigin-RevId: 141044216
MOS_MIGRATED_REVID=141044216

1 files changed, 70 insertions, 0 deletions

diff --git a/tools/test/LcovMerger/java/com/google/devtools/lcovmerger/Main.java b/tools/test/LcovMerger/java/com/google/devtools/lcovmerger/Main.java
new file mode 100644
index 0000000000..e5bf197c3a
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+++ b/tools/test/LcovMerger/java/com/google/devtools/lcovmerger/Main.java
@@ -0,0 +1,70 @@
+// Copyright 2016 The Bazel Authors. 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.lcovmerger;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * Command line utility to convert raw coverage files to lcov (text) format.
+ */
+public class Main {
+  private static final Logger logger = Logger.getLogger(Main.class.getName());
+
+  public static void main(String[] args) {
+    Map<String, String> flags = null;
+    try {
+      flags = parseFlags(args);
+    } catch (IllegalArgumentException e) {
+      logger.log(Level.SEVERE, e.getMessage());
+      System.exit(1);
+    }
+
+    LcovMerger lcovMerger = new LcovMerger(flags.get("coverage_dir"), flags.get("output_file"));
+    boolean success = lcovMerger.merge();
+    System.exit(success ? 0 : 1);
+  }
+
+  /**
+   * Parse flags in the form of "--coverage_dir=... -output_file=..."
+   */
+  private static Map<String, String> parseFlags(String[] args) {
+    Map<String, String> flags = new HashMap<>();
+
+    for (String arg : args) {
+      if (!arg.startsWith("--")) {
+        throw new IllegalArgumentException("Argument (" + arg + ") should start with --");
+      }
+      String[] parts = arg.substring(2).split("=", 2);
+      if (parts.length != 2) {
+        throw new IllegalArgumentException("There should be = in argument (" + arg + ")");
+      }
+      flags.put(parts[0], parts[1]);
+    }
+
+    // Validate flags
+    if (!flags.containsKey("coverage_dir")) {
+      throw new IllegalArgumentException("coverage_dir was not specified");
+    }
+    if (!flags.containsKey("output_file")) {
+      // Different from blaze, this should be mandatory
+      throw new IllegalArgumentException("output_file was not specified");
+    }
+
+    return flags;
+  }
+}