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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.query.sql.executor;

import com.arcadedb.query.sql.parser.MatchPathItem;

import java.util.*;

/**
 * Created by luigidellaquila on 28/07/15.
 */
public class PatternNode {
  public       String           alias;
  public final Set out        = new LinkedHashSet<>();
  public final Set in         = new LinkedHashSet<>();
  public       int              centrality = 0;
  public       boolean          optional   = false;

  public int addEdge(final MatchPathItem item, final PatternNode to) {
    final PatternEdge edge = new PatternEdge();
    edge.item = item;
    edge.out = this;
    edge.in = to;
    this.out.add(edge);
    to.in.add(edge);
    return 1;
  }

  public boolean isOptionalNode() {
    return optional;
  }
}