// Copyright 2017 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.analysis; import com.google.common.collect.ImmutableMap; import com.google.common.collect.Interner; import com.google.devtools.build.lib.concurrent.BlazeInterners; import java.util.Arrays; import java.util.Map.Entry; import javax.annotation.Nullable; import javax.annotation.concurrent.Immutable; /** * Provides a mapping between a TransitiveInfoProvider class and an instance. * *
This class implements a map where it is expected that a lot of the key sets will be the same.
* These key sets are shared and an offset table of indices is computed. Each provider map instance
* thus contains only a reference to the shared offset table, and a plain array of providers.
*/
@Immutable
final class TransitiveInfoProviderMapOffsetBased implements TransitiveInfoProviderMap {
private static final Interner P getProvider(Class providerClass) {
Class effectiveClass = TransitiveInfoProviderEffectiveClassHelper.get(providerClass);
int offset = offsetTable.getOffsetForClass(effectiveClass);
return offset >= 0 ? (P) providers[offset] : null;
}
@Override
public int getProviderCount() {
return providers.length;
}
@Override
public Class extends TransitiveInfoProvider> getProviderClassAt(int i) {
return offsetTable.providerClasses[i];
}
@Override
public TransitiveInfoProvider getProviderAt(int i) {
return providers[i];
}
}