1 files changed, 110 insertions, 0 deletions
diff --git a/src/tools/android/java/com/google/devtools/build/android/aapt2/SdkToolAttributeWriter.java b/src/tools/android/java/com/google/devtools/build/android/aapt2/SdkToolAttributeWriter.java
new file mode 100644
index 0000000000..3f4f9dec34
--- /dev/null
+++ b/src/tools/android/java/com/google/devtools/build/android/aapt2/SdkToolAttributeWriter.java
@@ -0,0 +1,110 @@
+// 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.build.android.aapt2;
+
+import com.android.SdkConstants;
+import com.google.common.base.Splitter;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Multimap;
+import com.google.common.collect.MultimapBuilder;
+import com.google.devtools.build.android.AndroidDataWritingVisitor;
+import com.google.devtools.build.android.AndroidResourceMerger.MergingException;
+import com.google.devtools.build.android.FullyQualifiedName;
+import com.google.devtools.build.android.proto.SerializeFormat.ToolAttributes;
+import com.google.devtools.build.android.xml.Namespaces;
+import java.io.BufferedOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Collection;
+import java.util.Map.Entry;
+import java.util.function.Function;
+import javax.xml.namespace.QName;
+
+/**
+ * An AndroidDataWritingVisitor that only records {@link SdkConstants#TOOLS_URI} attributes to the
+ * {@link ToolAttributes} proto format. Comma delimited values {@link SdkConstants#ATTR_KEEP} and
+ * {@link SdkConstants#ATTR_DISCARD} will be expanded into separate values.
+ */
+class SdkToolAttributeWriter implements AndroidDataWritingVisitor {
+
+  private static final Splitter COMMA_SPLITTER = Splitter.on(',');
+
+  private static final Function<String, Iterable<String>> DEFAULT_ATTRIBUTE_PROCESSOR =
+      ImmutableList::of;
+
+  private static final ImmutableMap<String, Function<String, Iterable<String>>>
+      ATTRIBUTE_PROCESSORS =
+          ImmutableMap.of(
+              SdkConstants.ATTR_KEEP, COMMA_SPLITTER::split,
+              SdkConstants.ATTR_DISCARD, COMMA_SPLITTER::split);
+
+  final Multimap<String, String> attributes = MultimapBuilder.hashKeys().hashSetValues().build();
+  private final Path out;
+
+  SdkToolAttributeWriter(Path out) {
+    this.out = out;
+  }
+
+  @Override
+  public void flush() throws IOException {
+    ToolAttributes.Builder builder = ToolAttributes.newBuilder();
+    for (Entry<String, Collection<String>> entry : attributes.asMap().entrySet()) {
+      builder.putAttributes(
+          entry.getKey(),
+          ToolAttributes.ToolAttributeValues.newBuilder().addAllValues(entry.getValue()).build());
+    }
+    try (OutputStream stream = new BufferedOutputStream(Files.newOutputStream(out))) {
+      builder.build().writeTo(stream);
+    }
+  }
+
+  @Override
+  public Path copyManifest(Path sourceManifest) throws IOException {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void copyAsset(Path source, String relativeDestinationPath) throws IOException {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void copyResource(Path source, String relativeDestinationPath) throws MergingException {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void defineAttribute(FullyQualifiedName fqn, String name, String value) {
+    final QName qName = QName.valueOf(fqn.name());
+    if (SdkConstants.TOOLS_URI.equals(qName.getNamespaceURI())) {
+      attributes.putAll(
+          qName.getLocalPart(),
+          ATTRIBUTE_PROCESSORS
+              .getOrDefault(qName.getLocalPart(), DEFAULT_ATTRIBUTE_PROCESSOR)
+              .apply(value));
+    }
+  }
+
+  @Override
+  public void defineNamespacesFor(FullyQualifiedName fqn, Namespaces namespaces) {}
+
+  @Override
+  public ValueResourceDefinitionMetadata define(FullyQualifiedName fqn) {
+    throw new UnsupportedOperationException();
+  }
+}