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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;
/**
* Creates the Skyframe node of an aspect.
*
* <p>Also has a reference to the definition of the aspect.
*/
public interface AspectFactory<TConfiguredTarget, TRuleContext, TAspect> {
/**
* Creates the aspect based on the configured target of the associated rule.
*
* @param base the configured target of the associated rule
* @param context the context of the associated configured target plus all the attributes the
* aspect itself has defined
*/
TAspect create(TConfiguredTarget base, TRuleContext context);
/**
* Returns the definition of the aspect.
*/
AspectDefinition getDefinition();
/**
* Dummy wrapper class for utility methods because interfaces cannot even have static ones.
*/
public static final class Util {
private Util() {
// Should never be instantiated
}
public static AspectFactory create(Class<? extends AspectFactory<?, ?, ?>> clazz) {
// TODO(bazel-team): This should be cached somehow, because this method is invoked quite often
try {
return clazz.newInstance();
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
}
}
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