Wrap the source Path in a DataSource object.

The DataSource object will then be used to track which values have been
overwritten and avoid incorrect merge warnings.

--
MOS_MIGRATED_REVID=137159260

1 files changed, 98 insertions, 0 deletions

diff --git a/src/tools/android/java/com/google/devtools/build/android/DataSource.java b/src/tools/android/java/com/google/devtools/build/android/DataSource.java
new file mode 100644
index 0000000000..5c51ea729a
--- /dev/null
+++ b/src/tools/android/java/com/google/devtools/build/android/DataSource.java
@@ -0,0 +1,98 @@
+// 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.build.android;
+
+import com.android.SdkConstants;
+import com.google.common.base.Objects;
+import com.google.devtools.build.android.proto.SerializeFormat.ProtoSource;
+import java.io.BufferedInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.FileSystem;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.attribute.BasicFileAttributeView;
+
+/** Represents where the DataValue was derived from. */
+public class DataSource implements Comparable<DataSource> {
+
+  public static DataSource from(ProtoSource protoSource, FileSystem currentFileSystem) {
+    Path path = currentFileSystem.getPath(protoSource.getFilename());
+    return of(path);
+  }
+
+  public static DataSource of(Path source) {
+    return new DataSource(source);
+  }
+
+  private final Path path;
+
+  private DataSource(Path path) {
+    this.path = path;
+  }
+
+  public Path getPath() {
+    return path;
+  }
+
+  public long getFileSize() throws IOException {
+    return Files.getFileAttributeView(path, BasicFileAttributeView.class).readAttributes().size();
+  }
+
+  @Override
+  public boolean equals(Object o) {
+    if (this == o) {
+      return true;
+    }
+    if (o == null || getClass() != o.getClass()) {
+      return false;
+    }
+    return Objects.equal(path, ((DataSource) o).path);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hashCode(path);
+  }
+
+  @Override
+  public int compareTo(DataSource o) {
+    return path.compareTo(o.path);
+  }
+
+  public InputStream newBufferedInputStream() throws IOException {
+    return new BufferedInputStream(Files.newInputStream(path));
+  }
+
+  /** Selects which DataSource should be considered the authoritative source of a value. */
+  // TODO(corysmith): Combine the sources so that we know both of the originating libraries.
+  // For now, prefer sources that have explicit definitions (values/ and not layout/), since the
+  // values are ultimately written out to a merged values.xml. Sources from layout/menu, etc.
+  // can come from "@+id" definitions.
+  public DataSource combine(DataSource otherSource) {
+    boolean thisInValuesFolder = isInValuesFolder();
+    boolean otherInValuesFolder = otherSource.isInValuesFolder();
+    if (thisInValuesFolder && !otherInValuesFolder) {
+      return this;
+    }
+    if (!thisInValuesFolder && otherInValuesFolder) {
+      return otherSource;
+    }
+    return this;
+  }
+
+  public boolean isInValuesFolder() {
+    return path.getParent().getFileName().toString().startsWith(SdkConstants.FD_RES_VALUES);
+  }
+}