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Core YAML 1.2 parser and emitter for Java

There is a newer version: 2.9

/**
 * Copyright (c) 2018, http://www.snakeyaml.org
 * 
 * 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 org.snakeyaml.engine.v2.exceptions.Mark;
import org.snakeyaml.engine.v2.exceptions.YamlEngineException;

import java.util.List;
import java.util.Objects;
import java.util.Optional;

public final class DirectiveToken extends Token {
    private final String name;
    private final Optional> value;

    public static final String YAML_DIRECTIVE = "YAML";
    public static final String TAG_DIRECTIVE = "TAG";

    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;
    }
}