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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.rules.python;
import com.google.common.base.Function;
import com.google.common.collect.ImmutableSet;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration.Fragment;
import com.google.devtools.build.lib.analysis.config.BuildOptions;
import com.google.devtools.build.lib.analysis.config.ConfigurationEnvironment;
import com.google.devtools.build.lib.analysis.config.ConfigurationFragmentFactory;
import com.google.devtools.build.lib.analysis.config.FragmentOptions;
import com.google.devtools.build.lib.analysis.config.InvalidConfigurationException;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.rules.cpp.CppConfiguration;
import com.google.devtools.build.lib.rules.cpp.CppOptions;
import com.google.devtools.build.lib.rules.cpp.CrosstoolConfigurationLoader;
import com.google.devtools.build.lib.view.config.crosstool.CrosstoolConfig;
import javax.annotation.Nullable;
/**
* A factory implementation for {@link PythonConfiguration} objects.
*/
public class PythonConfigurationLoader implements ConfigurationFragmentFactory {
private final Function<String, String> cpuTransformer;
public PythonConfigurationLoader(Function<String, String> cpuTransformer) {
this.cpuTransformer = cpuTransformer;
}
@Override
public ImmutableSet<Class<? extends FragmentOptions>> requiredOptions() {
return ImmutableSet.of(PythonOptions.class, CppOptions.class);
}
@Nullable
private CrosstoolConfig.CToolchain getToolchain(
ConfigurationEnvironment env, BuildOptions buildOptions, Label crosstoolTop)
throws InvalidConfigurationException {
CrosstoolConfigurationLoader.CrosstoolFile file =
CrosstoolConfigurationLoader.readCrosstool(env, crosstoolTop);
if (file == null) {
return null;
}
return CrosstoolConfigurationLoader.selectToolchain(
file.getProto(), buildOptions, cpuTransformer);
}
@Override
public PythonConfiguration create(ConfigurationEnvironment env, BuildOptions buildOptions)
throws InvalidConfigurationException {
PythonOptions pythonOptions = buildOptions.get(PythonOptions.class);
CppConfiguration cppConfiguration = env.getFragment(buildOptions, CppConfiguration.class);
if (cppConfiguration == null) {
return null;
}
CrosstoolConfig.CToolchain toolchain = getToolchain(
env, buildOptions, buildOptions.get(CppOptions.class).crosstoolTop);
if (toolchain == null) {
return null;
}
boolean ignorePythonVersionAttribute = pythonOptions.forcePython != null;
PythonVersion pythonVersion = pythonOptions.getPythonVersion();
return new PythonConfiguration(pythonVersion, ignorePythonVersionAttribute);
}
@Override
public Class<? extends Fragment> creates() {
return PythonConfiguration.class;
}
}
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