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Lock-free document store—optimized for high rate atomic state changes—that concurrently commits and compacts on-disk log-structured storage files without blocking parallel in-memory updates to associative B-tree maps, spatial Q-tree maps, sequential S-tree lists, and singleton U-tree values

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// Copyright 2015-2020 SWIM.AI inc.
//
// 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 swim.db;

import swim.structure.Slot;
import swim.structure.Value;
import swim.util.Cursor;

final class QTreeValueCursor implements Cursor {

  final Cursor inner;

  QTreeValueCursor(Cursor inner) {
    this.inner = inner;
  }

  @Override
  public boolean isEmpty() {
    return this.inner.isEmpty();
  }

  @Override
  public Value head() {
    return this.inner.head().toValue().body();
  }

  @Override
  public void step() {
    this.inner.step();
  }

  @Override
  public void skip(long count) {
    this.inner.skip(count);
  }

  @Override
  public boolean hasNext() {
    return this.inner.hasNext();
  }

  @Override
  public long nextIndexLong() {
    return this.inner.nextIndexLong();
  }

  @Override
  public int nextIndex() {
    return this.inner.nextIndex();
  }

  @Override
  public Value next() {
    return this.inner.next().toValue().body();
  }

  @Override
  public boolean hasPrevious() {
    return this.inner.hasPrevious();
  }

  @Override
  public long previousIndexLong() {
    return this.inner.previousIndexLong();
  }

  @Override
  public int previousIndex() {
    return this.inner.previousIndex();
  }

  @Override
  public Value previous() {
    return this.inner.previous().toValue().body();
  }

  @Override
  public void load() throws InterruptedException {
    this.inner.load();
  }

}