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// Copyright 2017 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.android.desugar;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
import com.google.common.collect.ImmutableMap;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.annotation.CheckReturnValue;
import javax.annotation.Nullable;
/**
* Opens the given list of input files and compute an index of all classes in them, to avoid
* scanning all inputs over and over for each class to load. An indexed inputs can have a parent
* that is firstly used when a file name is searched.
*/
class IndexedInputs {
private final ImmutableMap<String, InputFileProvider> inputFiles;
/**
* Parent {@link IndexedInputs} to use before to search a file name into this {@link
* IndexedInputs}.
*/
@Nullable
private final IndexedInputs parent;
/** Index a list of input files without a parent {@link IndexedInputs}. */
public IndexedInputs(List<InputFileProvider> inputProviders) {
this.parent = null;
this.inputFiles = indexInputs(inputProviders);
}
/**
* Create a new {@link IndexedInputs} with input files previously indexed and with a parent {@link
* IndexedInputs}.
*/
private IndexedInputs(
ImmutableMap<String, InputFileProvider> inputFiles, IndexedInputs parentIndexedInputs) {
this.parent = parentIndexedInputs;
this.inputFiles = inputFiles;
}
/**
* Create a new {@link IndexedInputs} with input files already indexed and with a parent {@link
* IndexedInputs}.
*/
@CheckReturnValue
public IndexedInputs withParent(IndexedInputs parent) {
checkState(this.parent == null);
return new IndexedInputs(this.inputFiles, parent);
}
@Nullable
public InputFileProvider getInputFileProvider(String filename) {
checkArgument(filename.endsWith(".class"));
if (parent != null) {
InputFileProvider inputFileProvider = parent.getInputFileProvider(filename);
if (inputFileProvider != null) {
return inputFileProvider;
}
}
return inputFiles.get(filename);
}
private ImmutableMap<String, InputFileProvider> indexInputs(
List<InputFileProvider> inputProviders) {
Map<String, InputFileProvider> indexedInputs = new HashMap<>();
for (InputFileProvider inputProvider : inputProviders) {
for (String relativePath : inputProvider) {
if (relativePath.endsWith(".class") && !indexedInputs.containsKey(relativePath)) {
indexedInputs.put(relativePath, inputProvider);
}
}
}
return ImmutableMap.copyOf(indexedInputs);
}
}
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