com.facebook.buck.util.ThriftRuleKeyDeserializer.java Source code

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

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/*
 * Copyright 2017-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;

import com.facebook.buck.log.thrift.rulekeys.FullRuleKey;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import org.apache.thrift.TDeserializer;
import org.apache.thrift.TException;
import org.apache.thrift.protocol.TCompactProtocol;

public class ThriftRuleKeyDeserializer {
    /**
     * Reads in a list of rule keys from a file
     *
     * @param logPath The path to the file
     * @return A list of FullRuleKey objects from the file
     * @throws IOException Could not read the file
     * @throws TException Could not deserialize an entry from the file
     */
    public static List<FullRuleKey> readRuleKeys(Path logPath) throws IOException, TException {
        ByteBuffer lengthBuf = ByteBuffer.allocate(4);
        List<FullRuleKey> ret = new ArrayList<>();
        try (FileInputStream logFileStream = new FileInputStream(logPath.toAbsolutePath().toString())) {
            while (logFileStream.available() > 0) {
                logFileStream.read(lengthBuf.array());
                int length = lengthBuf.getInt();
                lengthBuf.rewind();

                byte[] serialized = new byte[length];
                logFileStream.read(serialized);
                TDeserializer serializer = new TDeserializer(new TCompactProtocol.Factory());
                FullRuleKey ruleKey = new FullRuleKey();
                serializer.deserialize(ruleKey, serialized);
                ret.add(ruleKey);
            }
            return ret;
        }
    }
}