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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.syntax;
import java.util.List;
import java.util.Map;
/**
* Function values in the BUILD language.
*
* <p>Each implementation of this interface defines a function in the BUILD language.
*
*/
public interface Function {
/**
* Implements the behavior of a call to a function with positional arguments
* "args" and keyword arguments "kwargs". The "ast" argument is provided to
* allow construction of EvalExceptions containing source information.
*/
Object call(List<Object> args,
Map<String, Object> kwargs,
FuncallExpression ast,
Environment env)
throws EvalException, InterruptedException;
/**
* Returns the name of the function.
*/
String getName();
// TODO(bazel-team): implement this for MethodLibrary functions as well.
/**
* Returns the type of the object on which this function is defined or null
* if this is a global function.
*/
Class<?> getObjectType();
}
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