com.facebook.buck.util.cache.MultiProjectFileHashCache.java Source code

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Here is the source code for com.facebook.buck.util.cache.MultiProjectFileHashCache.java

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/*
 * Copyright 2015-present Facebook, Inc.
 *
 * 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.facebook.buck.util.cache;

import com.facebook.buck.io.ProjectFilesystem;
import com.facebook.buck.model.Pair;
import com.google.common.base.Optional;
import com.google.common.collect.ImmutableList;
import com.google.common.hash.HashCode;

import java.io.IOException;
import java.nio.file.NoSuchFileException;
import java.nio.file.Path;

public class MultiProjectFileHashCache implements FileHashCache {

    private final ImmutableList<? extends ProjectFileHashCache> projectCaches;

    public MultiProjectFileHashCache(ImmutableList<? extends ProjectFileHashCache> projectCaches) {
        this.projectCaches = projectCaches;
    }

    private Optional<Pair<FileHashCache, Path>> lookup(Path path) {
        for (ProjectFileHashCache cache : projectCaches) {
            ProjectFilesystem filesystem = cache.getFilesystem();
            Optional<Path> relativePath = filesystem.getPathRelativeToProjectRoot(path);
            if (relativePath.isPresent() && !filesystem.isIgnored(relativePath.get())) {
                return Optional.of(new Pair<FileHashCache, Path>(cache, relativePath.get()));
            }
        }
        return Optional.absent();
    }

    @Override
    public boolean contains(Path path) {
        Optional<Pair<FileHashCache, Path>> found = lookup(path);
        return found.isPresent() && found.get().getFirst().contains(found.get().getSecond());
    }

    @Override
    public void invalidate(Path path) {
        Optional<Pair<FileHashCache, Path>> found = lookup(path);
        if (found.isPresent()) {
            found.get().getFirst().invalidate(found.get().getSecond());
        }
    }

    @Override
    public void invalidateAll() {
        for (ProjectFileHashCache cache : projectCaches) {
            cache.invalidateAll();
        }
    }

    @Override
    public HashCode get(Path path) throws IOException {
        Optional<Pair<FileHashCache, Path>> found = lookup(path);
        if (!found.isPresent()) {
            throw new NoSuchFileException(path.toString());
        }
        return found.get().getFirst().get(found.get().getSecond());
    }

}