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Java re-implementation of tiny graphviz

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/*
 * Copyright 2022 The graph-support project
 *
 * 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.graphper.layout;

import java.util.HashSet;
import java.util.Objects;
import java.util.Set;

/**
 * The recursive template class of the user graph model, which marks the node has been visited, and
 * provides a method to determine whether the node is visited.
 *
 * @author Jamison Jiang
 */
public abstract class Mark {

  protected Set marked;

  protected Mark() {
  }

  protected Mark(int initialCapacity) {
    this.marked = new HashSet<>(initialCapacity);
  }

  protected void mark(T node) {
    Objects.requireNonNull(node);

    if (marked == null) {
      marked = new HashSet<>();
    }
    marked.add(node);
  }

  protected boolean isMark(T node) {
    if (marked == null) {
      return false;
    }
    return marked.contains(node);
  }

  protected void clear() {
    if (marked == null) {
      return;
    }
    marked.clear();
  }
}