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Simple persistent scheduler for scheduled tasks, recurring or ad-hoc.

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/*
 * Copyright (C) Gustav Karlsson
 *
 * 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.github.kagkarlsson.scheduler.task.schedule;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.regex.MatchResult;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public abstract class RegexBasedParser implements Parser {
  private final Pattern pattern;
  private final List examples;

  public RegexBasedParser(Pattern pattern, List examples) {
    this.pattern = Objects.requireNonNull(pattern);
    this.examples = new ArrayList<>(examples);
  }

  @Override
  public Optional parse(String scheduleString) {
    if (scheduleString == null) {
      return Optional.empty();
    }
    Matcher m = pattern.matcher(scheduleString);
    if (m.matches()) {
      return Optional.of(matchedSchedule(m));
    } else {
      return Optional.empty();
    }
  }

  @Override
  public List examples() {
    return Collections.unmodifiableList(examples);
  }

  protected abstract Schedule matchedSchedule(MatchResult result);
}