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// Copyright 2014 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.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import javax.annotation.Nullable;
/**
* Instances of {@link MakeVariableSupplier} passed to {@link ConfigurationMakeVariableContext} will
* be called before getting value from {@link ConfigurationMakeVariableContext} itself.
*/
public interface MakeVariableSupplier {
/** Returns Make variable value or null if value is not supplied. */
@Nullable
String getMakeVariable(String variableName);
/** Returns all Make variables that it supplies */
ImmutableMap<String, String> getAllMakeVariables();
/**
* {@link MakeVariableSupplier} that reads variables from a list of {@link TemplateVariableInfo}
* providers. This implementation respects the ordering of providers, with the first listed being
* the highest priority.
*/
class TemplateVariableInfoBackedMakeVariableSupplier implements MakeVariableSupplier {
private final ImmutableList<TemplateVariableInfo> templateVariableProviders;
public TemplateVariableInfoBackedMakeVariableSupplier(
List<TemplateVariableInfo> templateVariableProviders) {
this.templateVariableProviders = ImmutableList.copyOf(templateVariableProviders);
}
@Nullable
@Override
public String getMakeVariable(String variableName) {
for (TemplateVariableInfo templateVariableInfo : templateVariableProviders) {
if (templateVariableInfo.getVariables().containsKey(variableName)) {
return templateVariableInfo.getVariables().get(variableName);
}
}
return null;
}
@Override
public ImmutableMap<String, String> getAllMakeVariables() {
Map<String, String> variables = new TreeMap<>();
for (TemplateVariableInfo templateVariableInfo : templateVariableProviders) {
variables.putAll(templateVariableInfo.getVariables());
}
return ImmutableMap.copyOf(variables);
}
}
/** {@link MakeVariableSupplier} that reads variables it supplies from a map. */
class MapBackedMakeVariableSupplier implements MakeVariableSupplier {
private final ImmutableMap<String, String> makeVariables;
public MapBackedMakeVariableSupplier(ImmutableMap<String, String> makeVariables) {
this.makeVariables = Preconditions.checkNotNull(makeVariables);
}
@Nullable
@Override
public String getMakeVariable(String variableName) {
return makeVariables.get(variableName);
}
@Override
public ImmutableMap<String, String> getAllMakeVariables() {
return makeVariables;
}
}
}
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