com.google.devtools.build.lib.bazel.rules.android.AndroidRepositoryFunction.java Source code

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Here is the source code for com.google.devtools.build.lib.bazel.rules.android.AndroidRepositoryFunction.java

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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.lib.bazel.rules.android;

import com.google.common.collect.ImmutableSortedSet;
import com.google.devtools.build.lib.rules.repository.RepositoryFunction;
import com.google.devtools.build.lib.skyframe.DirectoryListingValue;
import com.google.devtools.build.lib.skyframe.Dirents;
import com.google.devtools.build.lib.skyframe.FileSymlinkException;
import com.google.devtools.build.lib.skyframe.FileValue;
import com.google.devtools.build.lib.skyframe.InconsistentFilesystemException;
import com.google.devtools.build.lib.vfs.Dirent;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.build.lib.vfs.RootedPath;
import com.google.devtools.build.skyframe.SkyFunction.Environment;
import com.google.devtools.build.skyframe.SkyFunctionException.Transience;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/** This class contains the common logic between Android NDK and SDK repository functions. */
abstract class AndroidRepositoryFunction extends RepositoryFunction {
    private static final Pattern PLATFORMS_API_LEVEL_PATTERN = Pattern.compile("android-(\\d+)");

    /**
     * Android rules depend on the contents in the SDK and NDK existing in the correct locations. This
     * error is thrown when required files or directories are not found or believed to be tampered
     * with.
     */
    abstract void throwInvalidPathException(Path path, Exception e) throws RepositoryFunctionException;

    /**
     * Gets a {@link DirectoryListingValue} for {@code dirPath} or returns null.
     *
     * <p>First, we get a {@link FileValue} to check the {@code dirPath} exists and is a directory. If
     * not, we throw an exception.
     */
    final DirectoryListingValue getDirectoryListing(Path root, PathFragment dirPath, Environment env)
            throws RepositoryFunctionException, InterruptedException {
        RootedPath rootedPath = RootedPath.toRootedPath(root, dirPath);
        try {
            FileValue dirFileValue = (FileValue) env.getValueOrThrow(FileValue.key(rootedPath), IOException.class,
                    FileSymlinkException.class, InconsistentFilesystemException.class);
            if (dirFileValue == null) {
                return null;
            }
            if (!dirFileValue.exists() || !dirFileValue.isDirectory()) {
                throwInvalidPathException(root,
                        new IOException(String.format(
                                "Expected directory at %s but it is not a directory or it does not exist.",
                                rootedPath.asPath().getPathString())));
            }
            return (DirectoryListingValue) env.getValueOrThrow(
                    DirectoryListingValue.key(RootedPath.toRootedPath(root, dirPath)),
                    InconsistentFilesystemException.class);
        } catch (IOException e) {
            throw new RepositoryFunctionException(e, Transience.PERSISTENT);
        } catch (FileSymlinkException | InconsistentFilesystemException e) {
            throw new RepositoryFunctionException(new IOException(e), Transience.PERSISTENT);
        }
    }

    /**
     * Gets the numeric api levels from the contents of the platforms directory in descending order.
     *
     * <p>Note that the directory entries are assumed to match {@code android-[0-9]+}. Any directory
     * entries that are not directories or do not match that pattern are ignored.
     */
    static final ImmutableSortedSet<Integer> getApiLevels(Dirents platformsDirectories) {
        ImmutableSortedSet.Builder<Integer> apiLevels = ImmutableSortedSet.reverseOrder();
        for (Dirent platformDirectory : platformsDirectories) {
            if (platformDirectory.getType() != Dirent.Type.DIRECTORY) {
                continue;
            }
            Matcher matcher = PLATFORMS_API_LEVEL_PATTERN.matcher(platformDirectory.getName());
            if (matcher.matches()) {
                apiLevels.add(Integer.parseInt(matcher.group(1)));
            }
        }
        return apiLevels.build();
    }
}