1 files changed, 82 insertions, 0 deletions
diff --git a/tools/test/LcovMerger/java/com/google/devtools/lcovmerger/LcovMergerFlags.java b/tools/test/LcovMerger/java/com/google/devtools/lcovmerger/LcovMergerFlags.java
new file mode 100644
index 0000000000..c218c53317
--- /dev/null
+++ b/tools/test/LcovMerger/java/com/google/devtools/lcovmerger/LcovMergerFlags.java
@@ -0,0 +1,82 @@
+// Copyright 2018 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 com.google.auto.value.AutoValue;
+import com.google.common.collect.ImmutableList;
+import java.util.List;
+import javax.annotation.Nullable;
+
+@AutoValue
+abstract class LcovMergerFlags {
+
+  @Nullable
+  abstract String coverageDir();
+
+  @Nullable
+  abstract String reportsFile();
+
+  abstract String outputFile();
+
+  abstract List<String> filterSources();
+
+  /** Parse flags in the form of "--coverage_dir=... -output_file=..." */
+  static LcovMergerFlags parseFlags(String[] args) {
+    ImmutableList.Builder<String> filterSources = new ImmutableList.Builder<>();
+    String coverageDir = null;
+    String reportsFile = null;
+    String outputFile = null;
+
+    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 + ")");
+      }
+      switch (parts[0]) {
+        case "coverage_dir":
+          coverageDir = parts[1];
+          break;
+        case "reports_file":
+          reportsFile = parts[1];
+          break;
+        case "output_file":
+          outputFile = parts[1];
+          break;
+        case "filter_sources":
+          filterSources.add(parts[1]);
+          break;
+        default:
+          throw new IllegalArgumentException("Unknown flag " + arg);
+      }
+    }
+
+    if (coverageDir == null && reportsFile == null) {
+      throw new IllegalArgumentException(
+          "At least one of --coverage_dir or --reports_file should be specified.");
+    }
+    if (coverageDir != null && reportsFile != null) {
+      throw new IllegalArgumentException(
+          "Only one of --coverage_dir or --reports_file must be specified.");
+    }
+    if (outputFile == null) {
+      throw new IllegalArgumentException("--output_file was not specified.");
+    }
+    return new AutoValue_LcovMergerFlags(
+        coverageDir, reportsFile, outputFile, filterSources.build());
+  }
+}