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Swirlds is a software platform designed to build fully-distributed applications that harness the power of the cloud without servers. Now you can develop applications with fairness in decision making, speed, trust and reliability, at a fraction of the cost of traditional server-based platforms.

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/*
 * Copyright (C) 2023-2024 Hedera Hashgraph, LLC
 *
 * 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.swirlds.logging.legacy;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * An object that is able to read a swirlds log file.
 */
public class SwirldsLogFileReader extends SwirldsLogReader {

    private final SwirldsLogParser parser;
    private final BufferedReader fileReader;

    /**
     * Create a new log file reader.
     *
     * @param logFile
     * 		The log file to read.
     * @param parser
     * 		The parser that should be used to read the log file.
     * @throws FileNotFoundException
     * 		thrown when the file is not found
     */
    public SwirldsLogFileReader(final File logFile, final SwirldsLogParser parser) throws FileNotFoundException {
        this.parser = parser;
        this.fileReader = new BufferedReader(new InputStreamReader(new FileInputStream(logFile)));
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected T readNextEntry() throws IOException {
        while (true) {
            String line = fileReader.readLine();
            if (line == null) {
                return null;
            }

            // skip empty lines
            if (line.strip().isEmpty()) {
                continue;
            }

            T entry = parser.parse(line);
            if (entry != null) {
                return entry;
            }
        }
    }
}