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/**
 * Copyright (c) 2014 SQUARESPACE, 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 com.squarespace.less.model;

import com.squarespace.less.core.LessInternalException;


/**
 * Base class for all elements, which are building blocks of {@link Selector}.
 */
public abstract class Element implements Node {

  /**
   * The element's combinator character.
   */
  protected final Combinator combinator;

  /**
   * Constructs an element with the given combinator character.
   */
  public Element(Combinator comb) {
    this.combinator = comb;
  }

  /**
   * Returns the combinator character for this element.
   */
  public Combinator combinator() {
    return combinator;
  }

  /**
   * Indicates whether this element is a wildcard.
   */
  public abstract boolean isWildcard();

  /**
   * See {@link Node#type()}
   */
  @Override
  public NodeType type() {
    return NodeType.ELEMENT;
  }

  @Override
  public boolean equals(Object obj) {
    throw new LessInternalException("Element subclass must implement equals(Object)!");
  }

  @Override
  public String toString() {
    return ModelUtils.toString(this);
  }

  @Override
  public int hashCode() {
    return ModelUtils.notHashable();
  }

}