// Copyright 2014 The Bazel Authors. 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.xcode.xcodegen;
import com.google.devtools.build.xcode.util.Mapping;
import com.facebook.buck.apple.xcode.xcodeproj.PBXFileReference;
import java.util.HashMap;
import java.util.Map;
/**
* A factory for {@link PBXFileReference}s. {@link PBXFileReference}s are inherently non-value
* types, in that each created instance appears in the serialized Xcodeproj file, even if some of
* the instances are equivalent. This serves as a cache so that a value type ({@link FileReference})
* can be converted to a canonical, cached {@link PBXFileReference} which is equivalent to it.
*/
final class PBXFileReferences {
private final Map<FileReference, PBXFileReference> cache = new HashMap<>();
/**
* Supplies a reference, containing values for fields specified in {@code reference}.
*/
public PBXFileReference get(FileReference reference) {
for (PBXFileReference existing : Mapping.of(cache, reference).asSet()) {
return existing;
}
PBXFileReference result = new PBXFileReference(
reference.name(), reference.path().orNull(), reference.sourceTree());
result.setExplicitFileType(reference.explicitFileType());
cache.put(reference, result);
return result;
}
}