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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.lib.rules.android;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.base.Function;
import com.google.common.collect.BiMap;
import com.google.common.collect.HashBiMap;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.analysis.TransitiveInfoProvider;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import javax.annotation.Nullable;
/**
* Provider of transitively available dex archives corresponding to Jars. A dex archive is a zip of
* {@code .dex} files that each encode exactly one {@code .class} file in an Android-readable form.
* The file names in a dex archive should match the file names in the originating Jar file, except
* with {@code .dex} appended, i.e., {@code <package/for/ClassName[$Inner].class.dex}.
*
* <p>For convenience this class implements a {@link Function} to map from Jars to dex archives if
* available (returns the given Jar otherwise).
*/
@Immutable
public class DexArchiveProvider implements TransitiveInfoProvider, Function<Artifact, Artifact> {
/**
* Provider that doesn't provide any dex archives, which is what any neverlink target should use.
* It's not strictly necessary to handle neverlink specially, but doing so reduces the amount
* of processing done for targets that won't be used for dexing anyway.
*/
public static final DexArchiveProvider NEVERLINK = new DexArchiveProvider.Builder().build();
/**
* Builder for {@link DexArchiveProvider}.
*/
public static class Builder {
private final BiMap<Artifact, Artifact> dexArchives = HashBiMap.create();
public Builder() {
}
/**
* Adds all dex archives from the given providers, which is useful to aggregate providers from
* dependencies.
*/
public Builder addTransitiveProviders(Iterable<DexArchiveProvider> providers) {
for (DexArchiveProvider provider : providers) {
dexArchives.putAll(provider.dexArchives);
}
return this;
}
/**
* Adds the given dex archive as a replacement for the given Jar.
*/
public Builder addDexArchive(Artifact dexArchive, Artifact dexedJar) {
checkArgument(dexArchive.getFilename().endsWith(".dex.zip"),
"Doesn't look like a dex archive: %s", dexArchive);
// Adding this artifact will fail iff dexArchive already appears as the value of another jar.
// It's ok and expected to put the same pair multiple times. Note that ImmutableBiMap fails
// in that situation, which is why we're not using it here.
// It's weird to put a dexedJar that's already in the map with a different value so we fail.
Artifact old = dexArchives.put(checkNotNull(dexedJar, "dexedJar"), dexArchive);
checkArgument(old == null || old.equals(dexedJar),
"We already had mapping %s-%s, so we don't also need %s", dexedJar, old, dexArchive);
return this;
}
/**
* Returns the finished {@link DexArchiveProvider}.
*/
public DexArchiveProvider build() {
return new DexArchiveProvider(ImmutableMap.copyOf(dexArchives));
}
}
/** Map from Jar artifacts to the corresponding dex archives. */
private final ImmutableMap<Artifact, Artifact> dexArchives;
private DexArchiveProvider(ImmutableMap<Artifact, Artifact> dexArchives) {
this.dexArchives = dexArchives;
}
/** Maps Jars to available dex archives and returns the given Jar otherwise. */
@Override
@Nullable
public Artifact apply(@Nullable Artifact jar) {
Artifact dexArchive = dexArchives.get(jar);
return dexArchive != null ? dexArchive : jar; // return null iff input == null
}
@Override
public int hashCode() {
return dexArchives.hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
DexArchiveProvider other = (DexArchiveProvider) obj;
return dexArchives.equals(other.dexArchives);
}
}
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