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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.events;

import org.snakeyaml.engine.v2.common.Anchor;
import org.snakeyaml.engine.v2.exceptions.Mark;

import java.util.Optional;

/**
 * Marks the inclusion of a previously anchored node.
 */
public final class AliasEvent extends NodeEvent {
    private final Anchor alias;

    public AliasEvent(Optional anchor, Optional startMark, Optional endMark) {
        super(anchor, startMark, endMark);
        if (!anchor.isPresent()) {
            throw new NullPointerException("Anchor is required in AliasEvent");
        } else {
            alias = anchor.get();
        }
    }

    public AliasEvent(Optional anchor) {
        this(anchor, Optional.empty(), Optional.empty());
    }

    @Override
    public ID getEventId() {
        return ID.Alias;
    }

    @Override
    public String toString() {
        return "=ALI *" + alias;
    }

    public Anchor getAlias() {
        return alias;
    }
}