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SirixDB is a hybrid on-disk and in-memory document oriented, versioned database system. It has a lightweight buffer manager, stores everything in a huge persistent and durable tree and allows efficient reconstruction of every revision. Furthermore, SirixDB implements change tracking, diffing and supports time travel queries.

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package io.sirix.index;

import io.sirix.axis.DescendantAxis;
import io.sirix.axis.NonStructuralWrapperAxis;
import io.sirix.api.json.JsonNodeReadOnlyTrx;
import io.sirix.api.visitor.JsonNodeVisitor;
import io.sirix.api.visitor.XmlNodeVisitor;
import io.sirix.api.xml.XmlNodeReadOnlyTrx;

import java.util.Set;

/**
 * Build an index by traversing the current revision.
 *
 * @author Johannes Lichtenberger
 *
 */
public final class IndexBuilder {

  /**
   * Build the index.
   *
   * @param rtx the current {@link XmlNodeReadOnlyTrx}
   * @param builders the index builders
   */
  public static void build(final XmlNodeReadOnlyTrx rtx, final Set builders) {
    final long nodeKey = rtx.getNodeKey();
    rtx.moveToDocumentRoot();

    var axis = new NonStructuralWrapperAxis(new DescendantAxis(rtx));
    while (axis.hasNext()) {
      axis.nextLong();

      for (final XmlNodeVisitor builder : builders) {
        rtx.acceptVisitor(builder);
      }
    }
    rtx.moveTo(nodeKey);
  }

  /**
   * Build the index.
   *
   * @param rtx the current {@link JsonNodeReadOnlyTrx}
   * @param builders the index builders
   */
  public static void build(final JsonNodeReadOnlyTrx rtx, final Set builders) {
    final long nodeKey = rtx.getNodeKey();
    rtx.moveToDocumentRoot();

    final var axis = new DescendantAxis(rtx);
    while (axis.hasNext()) {
      axis.nextLong();
      for (final JsonNodeVisitor builder : builders) {
        rtx.acceptVisitor(builder);
      }
    }
    rtx.moveTo(nodeKey);
  }

}