1 files changed, 111 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/util/PathFragmentFilter.java b/src/main/java/com/google/devtools/build/lib/util/PathFragmentFilter.java
new file mode 100644
index 0000000000..34f6cd2c95
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+++ b/src/main/java/com/google/devtools/build/lib/util/PathFragmentFilter.java
@@ -0,0 +1,111 @@
+// 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 com.google.common.base.Joiner;
+import com.google.common.base.Splitter;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Lists;
+import com.google.devtools.build.lib.vfs.PathFragment;
+import com.google.devtools.common.options.Converter;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Handles options that specify list of included/excluded directories.
+ * Validates whether path is included in that filter.
+ *
+ * Excluded directories always take precedence over included ones (path depth
+ * and order are not important).
+ */
+public class PathFragmentFilter implements Serializable {
+  private final List<PathFragment> inclusions;
+  private final List<PathFragment> exclusions;
+
+  /**
+   * Converts from a colon-separated list of of paths with optional '-' prefix into the
+   * PathFragmentFilter:
+   *   [-]path1[,[-]path2]...
+   *
+   * Order of paths is not important. Empty entries are ignored. '-' marks an excluded path.
+   */
+  public static class PathFragmentFilterConverter implements Converter<PathFragmentFilter> {
+
+    @Override
+    public PathFragmentFilter convert(String input) {
+      List<PathFragment> inclusionList = new ArrayList<>();
+      List<PathFragment> exclusionList = new ArrayList<>();
+
+      for (String piece : Splitter.on(',').split(input)) {
+        if (piece.length() > 1 && piece.startsWith("-")) {
+          exclusionList.add(new PathFragment(piece.substring(1)));
+        } else if (piece.length() > 0) {
+          inclusionList.add(new PathFragment(piece));
+        }
+      }
+
+      // TODO(bazel-team): (2010) Both lists could be optimized not to include unnecessary
+      // entries - e.g.  entry 'a/b/c' is not needed if 'a/b' is also specified and 'a/b' on
+      // inclusion list is not needed if 'a' or 'a/b' is on exclusion list.
+      return new PathFragmentFilter(inclusionList, exclusionList);
+    }
+
+    @Override
+    public String getTypeDescription() {
+      return "a comma-separated list of paths with prefix '-' specifying excluded paths";
+    }
+
+  }
+
+  /**
+   * Creates new PathFragmentFilter using provided inclusion and exclusion path lists.
+   */
+  public PathFragmentFilter(List<PathFragment> inclusions, List<PathFragment> exclusions) {
+    this.inclusions = ImmutableList.copyOf(inclusions);
+    this.exclusions = ImmutableList.copyOf(exclusions);
+  }
+
+  /**
+   * @return true iff path is included (it is not on the exclusion list and
+   *         it is either on the inclusion list or inclusion list is empty).
+   */
+  public boolean isIncluded(PathFragment path) {
+    for (PathFragment excludedPath : exclusions) {
+      if (path.startsWith(excludedPath)) {
+        return false;
+      }
+    }
+    for (PathFragment includedPath : inclusions) {
+      if (path.startsWith(includedPath)) {
+        return true;
+      }
+    }
+    return inclusions.isEmpty(); // If inclusion filter is not specified, path is included.
+  }
+
+  @Override
+  public String toString() {
+    List<String> list = Lists.newArrayListWithExpectedSize(inclusions.size() + exclusions.size());
+    for (PathFragment path : inclusions) {
+      list.add(path.getPathString());
+    }
+    for (PathFragment path : exclusions) {
+      list.add("-" + path.getPathString());
+    }
+    return Joiner.on(',').join(list);
+  }
+}