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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.packages;
import com.google.devtools.build.lib.events.EventHandler;
import com.google.devtools.build.lib.syntax.Environment;
import com.google.devtools.build.lib.syntax.Environment.Extension;
import com.google.devtools.build.lib.syntax.Mutability;
import com.google.devtools.build.lib.vfs.PathFragment;
import java.util.Map;
import javax.annotation.Nullable;
/**
* The collection of the supported build rules. Provides an Environment for Skylark rule creation.
*/
public interface RuleClassProvider {
/**
* Workspace relative path to the prelude file.
*/
PathFragment getPreludePath();
/**
* The default runfiles prefix (may be overwritten by the WORKSPACE file).
*/
String getRunfilesPrefix();
/**
* Returns a map from rule names to rule class objects.
*/
Map<String, RuleClass> getRuleClassMap();
/**
* Returns a map from aspect names to aspect factory objects.
*/
Map<String, Class<? extends AspectFactory<?, ?, ?>>> getAspectFactoryMap();
/**
* Returns a new Skylark Environment instance for rule creation.
* Implementations need to be thread safe.
* Be sure to close() the mutability before you return the results of said evaluation.
* @param mutability the Mutability for the current evaluation context
* @param eventHandler the EventHandler for warnings, errors, etc.
* @param astFileContentHashCode the hash code identifying this environment.
* @return an Environment, in which to evaluate load time skylark forms.
*/
Environment createSkylarkRuleClassEnvironment(
Mutability mutability,
EventHandler eventHandler,
@Nullable String astFileContentHashCode,
@Nullable Map<PathFragment, Extension> importMap);
/**
* Returns the default content of the WORKSPACE file.
*
* <p>Used to provide external dependencies for built-in rules. Rules defined here can be
* overwritten in the WORKSPACE file in the actual workspace.
*/
String getDefaultWorkspaceFile();
}
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