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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;
/**
* Partial implementation of Function interface.
*/
public abstract class AbstractFunction implements Function {
private final String name;
protected AbstractFunction(String name) {
this.name = name;
}
/**
* Returns the name of this function.
*/
@Override
public String getName() {
return name;
}
@Override
public Class<?> getObjectType() {
return null;
}
@Override public String toString() {
return name;
}
/**
* Abstract implementation of Function that accepts no parameters.
*/
public abstract static class NoArgFunction extends AbstractFunction {
public NoArgFunction(String name) {
super(name);
}
@Override
public Object call(List<Object> args, Map<String, Object> kwargs, FuncallExpression ast,
Environment env) throws EvalException, InterruptedException {
if (args.size() != 1 || !kwargs.isEmpty()) {
throw new EvalException(ast.getLocation(), "Invalid number of arguments (expected 0)");
}
return call(args.get(0), ast, env);
}
public abstract Object call(Object self, FuncallExpression ast, Environment env)
throws EvalException, InterruptedException;
}
}
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