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

Introduction

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

Source

/**
 * 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.IOException;
import java.util.List;

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

import de.flapdoodle.logparser.IRewindableReader;

public class StringListReaderAdapter implements IRewindableReader {

    private final List<String> _lines;
    int _idx = 0;
    int _marker = -1;

    public StringListReaderAdapter(List<String> lines) {
        _lines = ImmutableList.copyOf(lines);
    }

    @Override
    public synchronized Optional<String> nextLine() throws IOException {
        if (_idx < _lines.size()) {
            String line = _lines.get(_idx);
            _idx++;
            return Optional.of(line);
        }
        return Optional.absent();
    }

    @Override
    public synchronized void setMarker() throws IOException {
        _marker = _idx;
    }

    @Override
    public synchronized void jumpToMarker() throws IOException {
        if (_marker == -1)
            throw new IOException("marker not set");
        _idx = _marker;
    }

}