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JavaCC is a parser/scanner generator for java.
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/* Copyright (c) 2006, Sun Microsystems, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Sun Microsystems, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.javacc.parser;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

/**
 * Describes expansions where one of many choices
 * is taken (c1|c2|...).
 */

public class Choice extends Expansion {

  /**
   * The list of choices of this expansion unit.  Each
   * List component will narrow to ExpansionUnit.
   */
  private List choices = new ArrayList();

  public Choice() {}

  public Choice(Token token) {
    this.setLine(token.beginLine);
    this.setColumn(token.beginColumn);
  }

  public Choice(Expansion expansion) {
    this.setLine(expansion.getLine());
    this.setColumn(expansion.getColumn());
    this.getChoices().add(expansion);
  }

  /**
   * @param choices the choices to set
   */
  public void setChoices(List choices) {
    this.choices = choices;
  }

  /**
   * @return the choices
   */
  public List getChoices() {
    return choices;
  }

  public StringBuffer dump(int indent, Set alreadyDumped) {
    StringBuffer sb = super.dump(indent, alreadyDumped);
    if (alreadyDumped.contains(this))
      return sb;
    alreadyDumped.add(this);
    for (Iterator it = getChoices().iterator(); it.hasNext(); ) {
      Expansion next = (Expansion)it.next();
      sb.append(eol).append(next.dump(indent + 1, alreadyDumped));
    }
    return sb;
  }
}