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/**
 * Copyright (c) 2008, 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.yaml.snakeyaml.events;

import java.util.Map;
import org.yaml.snakeyaml.DumperOptions.Version;
import org.yaml.snakeyaml.error.Mark;

/**
 * Marks the beginning of a document.
 * 
 * This event followed by the document's content and a {@link DocumentEndEvent}.
 * 
 */
public final class DocumentStartEvent extends Event {

  private final boolean explicit;
  private final Version version;
  private final Map tags;

  /**
   * Create
   *
   * @param startMark - start
   * @param endMark - end
   * @param explicit - true when it is present in the document
   * @param version - YAML version
   * @param tags - tag directives
   */
  public DocumentStartEvent(Mark startMark, Mark endMark, boolean explicit, Version version,
      Map tags) {
    super(startMark, endMark);
    this.explicit = explicit;
    this.version = version;
    this.tags = tags;
  }

  /**
   * getter
   *
   * @return true when document end is present
   */
  public boolean getExplicit() {
    return explicit;
  }

  /**
   * YAML version the document conforms to.
   *
   * @return nullif the document has no explicit %YAML directive.
   *         Otherwise an array with two components, the major and minor part of the version (in
   *         this order).
   */
  public Version getVersion() {
    return version;
  }

  /**
   * Tag shorthands as defined by the %TAG directive.
   *
   * @return Mapping of 'handles' to 'prefixes' (the handles include the '!' characters).
   */
  public Map getTags() {
    return tags;
  }

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