001    package org.jaga.reproduction.booleanFormulas.nodes;
002    
003    
004    /**
005     * TODO: Complete these comments.
006     *
007     * <p><u>Project:</u> JAGA - Java API for Genetic Algorithms.</p>
008     *
009     * <p><u>Company:</u> University College London and JAGA.Org
010     *    (<a href="http://www.jaga.org" target="_blank">http://www.jaga.org</a>).
011     * </p>
012     *
013     * <p><u>Copyright:</u> (c) 2004 by G. Paperin.<br/>
014     *    This program is free software; you can redistribute it and/or modify
015     *    it under the terms of the GNU General Public License as published by
016     *    the Free Software Foundation, ONLY if you include a note of the original
017     *    author(s) in any redistributed/modified copy.<br/>
018     *    This program is distributed in the hope that it will be useful,
019     *    but WITHOUT ANY WARRANTY; without even the implied warranty of
020     *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
021     *    GNU General Public License for more details.<br/>
022     *    You should have received a copy of the GNU General Public License
023     *    along with this program; if not, write to the Free Software
024     *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
025     *    or see http://www.gnu.org/licenses/gpl.html</p>
026     *
027     * @author Greg Paperin (greg@jaga.org)
028     *
029     * @version JAGA public release 1.0 beta
030     */
031    
032    abstract public class ConstantNode extends BooleanFormulaTreeNode {
033    
034            public ConstantNode() {}
035    
036            public int getRequiredChildrenNumber() {
037                    return 0;
038            }
039    
040            public Object clone() {
041                    ConstantNode copy = null;
042                    try {
043                            copy = (ConstantNode) this.getClass().newInstance();
044                    } catch(InstantiationException e1) {
045                            throw new InstantiationError(e1.getMessage());
046                    } catch(IllegalAccessException e2) {
047                            throw new IllegalAccessError(e2.getMessage());
048                    }
049                    return copy;
050            }
051    
052            public int recalcHeight() {
053                    final int height = 1;
054                    setHeight(height);
055                    OperatorNode parent = getParent();
056                    if (null != parent)
057                            parent.propagateNewHeight();
058                    return height;
059            }
060    
061    }