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// 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.MoreObjects;
import com.google.common.base.Objects;
import com.google.common.collect.ImmutableSet;
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 sourcePath) {
return new DataSource(sourcePath, ImmutableSet.<DataSource>of());
}
private final Path path;
private final ImmutableSet<DataSource> overrides;
private DataSource(Path path, ImmutableSet<DataSource> overrides) {
this.path = path;
this.overrides = overrides;
}
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)
&& Objects.equal(overrides, ((DataSource) o).overrides);
}
@Override
public int hashCode() {
return Objects.hashCode(path, overrides);
}
@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 DataSource overwrite(DataSource... sources) {
ImmutableSet.Builder<DataSource> overridesBuilder =
ImmutableSet.<DataSource>builder().addAll(this.overrides);
for (DataSource dataSource : sources) {
// A DataSource cannot overwrite itself.
// This will be an error once the depot can be assured not have source files.
if (!dataSource.path.equals(path)) {
// Flatten the DataSource to a placeholder to avoid building trees, which end up being
// expensive, slow, and hard to reason about.
overridesBuilder.add(of(dataSource.path));
}
overridesBuilder.addAll(dataSource.overrides);
}
return new DataSource(path, overridesBuilder.build());
}
public ImmutableSet<DataSource> overrides() {
return overrides;
}
public boolean isInValuesFolder() {
return path.getParent().getFileName().toString().startsWith(SdkConstants.FD_RES_VALUES);
}
public boolean hasOveridden(DataSource source) {
return overrides.contains(source);
}
@Override
public String toString() {
return MoreObjects.toStringHelper(getClass())
.add("path", path)
.add("overrides", overrides)
.toString();
}
/** Returns a representation suitible for a conflict message. */
public String asConflictString() {
return path.toString();
}
}
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