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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.google.common.base.Function;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.devtools.build.android.proto.SerializeFormat;
import com.google.devtools.build.android.proto.SerializeFormat.Header;
import com.google.devtools.build.android.proto.SerializeFormat.ProtoSource;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.FileSystem;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.NavigableMap;
import java.util.stream.Collectors;
/**
* Tracks mappings from resource source paths (/foo/bar/res/values/colors.xml) to an ID for a more
* compact serialization format.
*/
class DataSourceTable {
private static final Function<DataValue, DataSource> VALUE_TO_SOURCE = DataValue::source;
private final Map<DataSource, Integer> sourceTable = new LinkedHashMap<>();
private DataSource[] idToSource;
/**
* Creates a DataSourceTable and serialize to the given outstream. Assigns each resource source
* path a number to enable {@link #getSourceId(DataSource)} queries.
*
* @param map the final map of resources
* @param outStream stream to serialize the source table
* @param headerBuilder the header to serialize
* @throws IOException if this fails to serialize the table to the outStream
*/
public static DataSourceTable createAndWrite(
NavigableMap<DataKey, DataValue> map, OutputStream outStream, Header.Builder headerBuilder)
throws IOException {
DataSourceTable sourceTable = new DataSourceTable();
sourceTable.writeSourceInfo(map, outStream);
sourceTable.setHeader(headerBuilder);
return sourceTable;
}
/** Convert the absolute source path to the source table index */
public int getSourceId(DataSource source) {
return sourceTable.get(source);
}
private void writeSourceInfo(NavigableMap<DataKey, DataValue> map, OutputStream outStream)
throws IOException {
int sourceNumber = 0;
LinkedList<DataSource> sourceQueue =
map.values()
.stream()
.map(VALUE_TO_SOURCE)
.collect(Collectors.toCollection(LinkedList::new));
while (!sourceQueue.isEmpty()) {
DataSource source = sourceQueue.pop();
if (!sourceTable.containsKey(source)) {
sourceTable.put(source, sourceNumber);
++sourceNumber;
sourceQueue.addAll(source.overrides());
}
}
for (DataSource dataSource : sourceTable.keySet()) {
ProtoSource.newBuilder()
.setFilename(dataSource.getPath().toString())
.addAllOverwritten(sourcesToIds(dataSource.overrides()))
.build()
.writeDelimitedTo(outStream);
}
}
private List<Integer> sourcesToIds(ImmutableSet<DataSource> overrides) {
ImmutableList.Builder<Integer> idsBuilder = ImmutableList.builder();
for (DataSource dataSource : overrides) {
if (!sourceTable.containsKey(dataSource)) {
throw new IllegalArgumentException(
"Cannot find data source: " + dataSource.toString() + " in " + sourceTable.keySet());
}
idsBuilder.add(sourceTable.get(dataSource));
}
return idsBuilder.build();
}
/** Fill in the serialize format header information required to deserialize */
private Header.Builder setHeader(Header.Builder headerBuilder) {
return headerBuilder.setSourceCount(sourceTable.size());
}
/** Deserialize the source table and allow {@link #sourceFromId(int)} queries. */
public static DataSourceTable read(InputStream in, FileSystem currentFileSystem, Header header)
throws IOException {
DataSourceTable sourceTable = new DataSourceTable();
sourceTable.readSourceInfo(in, currentFileSystem, header);
return sourceTable;
}
/** Convert the source ID to full Path */
public DataSource sourceFromId(int sourceId) {
return idToSource[sourceId];
}
private void readSourceInfo(InputStream in, FileSystem currentFileSystem, Header header)
throws IOException {
int numberOfSources = header.getSourceCount();
// Read back the sources.
idToSource = new DataSource[numberOfSources];
for (int i = 0; i < numberOfSources; i++) {
ProtoSource protoSource = SerializeFormat.ProtoSource.parseDelimitedFrom(in);
idToSource[i] = DataSource.from(protoSource, currentFileSystem);
}
}
}
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