de.flapdoodle.logparser.io.BufferedReaderAdapter.java Source code

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Here is the source code for de.flapdoodle.logparser.io.BufferedReaderAdapter.java

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/**
 * Copyright (C) 2013
 *   Michael Mosmann <michael@mosmann.de>
 *
 * with contributions from
 *    ${lic.developers}
 *
 * 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 de.flapdoodle.logparser.io;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.List;

import com.google.common.base.Optional;
import com.google.common.collect.Lists;

import de.flapdoodle.logparser.IReader;
import de.flapdoodle.logparser.IRewindableReader;

public class BufferedReaderAdapter implements IRewindableReader {

    private final BufferedReader _reader;
    private final int _readAheadLimit;

    public BufferedReaderAdapter(InputStream stream, Charset charset, int readAheadLimit) {
        _readAheadLimit = readAheadLimit;
        _reader = new BufferedReader(new InputStreamReader(stream, charset));
    }

    @Override
    public Optional<String> nextLine() throws IOException {
        String line = _reader.readLine();
        return line != null ? Optional.of(line) : Optional.<String>absent();
    }

    @Override
    public void setMarker() throws IOException {
        _reader.mark(_readAheadLimit);
    }

    @Override
    public void jumpToMarker() throws IOException {
        _reader.reset();
    }

}