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Core YAML 1.2 parser and emitter for Java

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/*
 * Copyright (c) 2018, SnakeYAML
 *
 * 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 org.snakeyaml.engine.v2.tokens;

import java.util.List;
import java.util.Objects;
import java.util.Optional;
import org.snakeyaml.engine.v2.exceptions.Mark;
import org.snakeyaml.engine.v2.exceptions.YamlEngineException;

public final class DirectiveToken extends Token {

  public static final String YAML_DIRECTIVE = "YAML";
  public static final String TAG_DIRECTIVE = "TAG";
  private final String name;
  private final Optional> value;

  public DirectiveToken(String name, Optional> value, Optional startMark,
      Optional endMark) {
    super(startMark, endMark);
    Objects.requireNonNull(name);
    this.name = name;
    Objects.requireNonNull(value);
    if (value.isPresent() && value.get().size() != 2) {
      throw new YamlEngineException(
          "Two strings/integers must be provided instead of " + value.get().size());
    }
    this.value = value;
  }

  public String getName() {
    return this.name;
  }

  public Optional> getValue() {
    return this.value;
  }

  @Override
  public Token.ID getTokenId() {
    return ID.Directive;
  }
}