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/*
* Copyright 2019 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.turbine.binder.lookup;
import com.google.common.collect.Iterables;
import com.google.turbine.binder.sym.ClassSymbol;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* A scope that corresponds to a particular package, which supports iteration over its enclosed
* classes.
*/
public interface PackageScope extends Scope {
/** Returns the top-level classes enclosed by this package. */
Iterable<ClassSymbol> classes();
default PackageScope append(PackageScope next) {
return concat(this, next);
}
static PackageScope concat(PackageScope base, PackageScope next) {
return new PackageScope() {
@Override
public Iterable<ClassSymbol> classes() {
return Iterables.concat(base.classes(), next.classes());
}
@Override
public @Nullable LookupResult lookup(LookupKey lookupKey) {
LookupResult result = base.lookup(lookupKey);
if (result != null) {
return result;
}
return next.lookup(lookupKey);
}
};
}
}
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