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// Copyright 2014 Google Inc. 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.bazel.repository;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.packages.NoSuchPackageException;
import com.google.devtools.build.lib.packages.PackageIdentifier.RepositoryName;
import com.google.devtools.build.lib.packages.Rule;
import com.google.devtools.build.lib.syntax.EvalException;
import com.google.devtools.build.skyframe.SkyFunction;
import com.google.devtools.build.skyframe.SkyFunctionException;
import com.google.devtools.build.skyframe.SkyFunctionException.Transience;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import java.io.IOException;
/**
* Implements delegation to the correct repository fetcher.
*/
public class RepositoryDelegatorFunction implements SkyFunction {
// Mapping of rule class name to SkyFunction.
private final ImmutableMap<String, RepositoryFunction> handlers;
public RepositoryDelegatorFunction(
ImmutableMap<String, RepositoryFunction> handlers) {
this.handlers = handlers;
}
@Override
public SkyValue compute(SkyKey skyKey, Environment env) throws SkyFunctionException {
RepositoryName repositoryName = (RepositoryName) skyKey.argument();
Rule rule = RepositoryFunction.getRule(repositoryName, null, env);
if (rule == null) {
return null;
}
RepositoryFunction handler = handlers.get(rule.getRuleClass());
if (handler == null) {
throw new IllegalStateException("Could not find handler for " + rule);
}
SkyKey key = new SkyKey(handler.getSkyFunctionName(), repositoryName);
try {
return env.getValueOrThrow(
key, NoSuchPackageException.class, IOException.class, EvalException.class);
} catch (NoSuchPackageException e) {
throw new RepositoryFunction.RepositoryFunctionException(e, Transience.PERSISTENT);
} catch (IOException e) {
throw new RepositoryFunction.RepositoryFunctionException(e, Transience.PERSISTENT);
} catch (EvalException e) {
throw new RepositoryFunction.RepositoryFunctionException(e, Transience.PERSISTENT);
}
}
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
}
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