package org.cache2k.benchmark.util;

/*
 * #%L
 * Benchmarks: utilities
 * %%
 * Copyright (C) 2013 - 2017 headissue GmbH, Munich
 * %%
 * 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.
 * #L%
 */

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.nio.charset.Charset;

/**
 * @author Jens Wilke; created: 2015-01-22
 */
public class LisTraceReader extends AccessPattern {

  LineNumberReader reader;
  int value;
  int count;

  /**
   * Read in, default charset.
   */
  public LisTraceReader(InputStream in) {
    this(in, Charset.defaultCharset());
  }

  public LisTraceReader(InputStream in, Charset cs) {
    reader = new LineNumberReader(new InputStreamReader(in, cs));
  }

  @Override
  public boolean isEternal() {
    return false;
  }

  @Override
  public boolean hasNext() throws Exception {
    if (--count > 0) { return true; }
    String s;
    do {
      s = reader.readLine();
      if (s == null) {
        return false;
      }
    } while (s.startsWith("#") || s.trim().length() == 0);
    try {
      String[] sa = s.split(" ");
      value = Integer.parseInt(sa[0]);
      count = Integer.parseInt(sa[1]);
    } catch(NumberFormatException e) {
      System.err.println("parse error line " + reader.getLineNumber() + ": " + s);
      return hasNext();
    }
    return true;
  }

  @Override
  public int next() throws IOException {
    return value;
  }

  @Override
  public void close() throws IOException {
    reader.close();
  }

}