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/*
 * Copyright © 2021-present Arcade Data Ltd ([email protected])
 *
 * 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.
 *
 * SPDX-FileCopyrightText: 2021-present Arcade Data Ltd ([email protected])
 * SPDX-License-Identifier: Apache-2.0
 */
package com.arcadedb.graph;

import com.arcadedb.utility.ResettableIterator;

/**
 * Created by luigidellaquila on 02/07/16.
 */
public class EdgeToVertexIterator implements ResettableIterator {
  private final EdgeIterator     edgeIterator;
  private final Vertex.DIRECTION direction;

  public EdgeToVertexIterator(final EdgeIterator iterator, final Vertex.DIRECTION direction) {
    if (direction == Vertex.DIRECTION.BOTH)
      throw new IllegalArgumentException("edge to vertex iterator does not support BOTH as direction");

    this.edgeIterator = iterator;
    this.direction = direction;
  }

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

  @Override
  public Vertex next() {
    return edgeIterator.next().getVertex(direction);
  }

  @Override
  public void reset() {
    edgeIterator.reset();
  }

  @Override
  public long countEntries() {
    return edgeIterator.countEntries();
  }

  @Override
  public long getBrowsed() {
    return edgeIterator.getBrowsed();
  }
}