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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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 com.rapiddweller.common.visitor;

import com.rapiddweller.common.Element;
import com.rapiddweller.common.Visitor;

import java.util.Collection;

/**
 * Implementation of the Element interface that supports navigating through sub elements.
 * Created: 04.02.2007 07:53:23
 *
 * @param  the type of object to be validated
 * @author Volker Bergmann
 */
public abstract class AbstractElement implements Element {

  @Override
  public final void accept(Visitor visitor) {
    acceptImpl(visitor);
    Collection> children = getChildren(visitor);
    if (children.size() > 0) {
      for (Element child : children) {
        child.accept(visitor);
      }
    }
  }

  /**
   * Accept.
   *
   * @param visitor the visitor
   */
  @SuppressWarnings("unchecked")
  protected void acceptImpl(Visitor visitor) {
    visitor.visit((E) this);
  }

  /**
   * Gets children.
   *
   * @param visitor the visitor
   * @return the children
   */
  protected abstract Collection> getChildren(Visitor visitor);

}