com.google.devtools.kythe.platform.shared.FileDataDirectory.java Source code

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Here is the source code for com.google.devtools.kythe.platform.shared.FileDataDirectory.java

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/*
 * Copyright 2014 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.devtools.kythe.platform.shared;

import com.google.common.io.Files;
import com.google.common.util.concurrent.Futures;
import com.google.devtools.kythe.common.PathUtil;

import java.io.File;
import java.util.concurrent.Future;

/**
 * {@link FileDataProvider} that looks up file data using the local filesystem. Each lookup only
 * uses the path (not the digest) and prefixes the path with a given root directory.
 */
public class FileDataDirectory implements FileDataProvider {
    private final String rootDirectory;

    public FileDataDirectory(String rootDirectory) {
        this.rootDirectory = rootDirectory;
    }

    @Override
    public Future<byte[]> startLookup(String path, String digest) {
        try {
            return Futures.immediateFuture(Files.asByteSource(new File(PathUtil.join(rootDirectory, path))).read());
        } catch (Throwable t) {
            return Futures.immediateFailedFuture(t);
        }
    }
}