ifelse.java

来自「jgap3.2 遗传算法工具包,嘿嘿,笨鸟先飞哦」· Java 代码 · 共 149 行

/*
 * This file is part of JGAP.
 *
 * JGAP offers a dual license model containing the LGPL as well as the MPL.
 *
 * For licencing information please see the file license.txt included with JGAP
 * or have a look at the top of class org.jgap.Chromosome which representatively
 * includes the JGAP license policy applicable for any file delivered with JGAP.
 */
package org.jgap.gp.function;

import org.jgap.*;
import org.jgap.gp.*;
import org.jgap.gp.impl.*;

/**
 * The if-then-else construct.
 *
 * @author Klaus Meffert
 * @since 3.0
 */
public class IfElse
    extends CommandGene {
  /** String containing the CVS revision. Read out via reflection!*/
  private final static String CVS_REVISION = "$Revision: 1.8 $";

  private Class m_type;

  public IfElse(final GPConfiguration a_conf, Class a_type)
      throws InvalidConfigurationException {
    this(a_conf, a_type, 0, null);
  }

  public IfElse(final GPConfiguration a_conf, Class a_type, int a_subReturnType,
                int[] a_subChildTypes)
      throws InvalidConfigurationException {
    super(a_conf, 3, CommandGene.VoidClass, a_subReturnType, a_subChildTypes);
    m_type = a_type;
  }

  public String toString() {
    return "if(&1) then (&2) else(&3)";
  }

  /**
   * @return textual name of this command
   *
   * @author Klaus Meffert
   * @since 3.2
   */
  public String getName() {
    return "IfElse";
  }

  public int execute_int(ProgramChromosome c, int n, Object[] args) {
    int x = c.execute_int(n, 0, args);
    int value = 0;
    if (x >= 0) {
      value = c.execute_int(n, 1, args);
    }
    else {
      value = c.execute_int(n, 2, args);
    }
    return value;
  }

  public long execute_long(ProgramChromosome c, int n, Object[] args) {
    long x = c.execute_long(n, 0, args);
    long value = 0;
    if (x >= 0) {
      value = c.execute_long(n, 1, args);
    }
    else {
      value = c.execute_long(n, 2, args);
    }
    return value;
  }

  public float execute_float(ProgramChromosome c, int n, Object[] args) {
    float x = c.execute_float(n, 0, args);
    float value = 0;
    if (x >= 0) {
      value = c.execute_float(n, 1, args);
    }
    else {
      value = c.execute_float(n, 2, args);
    }
    return value;
  }

  public double execute_double(ProgramChromosome c, int n, Object[] args) {
    double x = c.execute_double(n, 0, args);
    double value = 0;
    if (x >= 0) {
      value = c.execute_double(n, 1, args);
    }
    else {
      value = c.execute_double(n, 2, args);
    }
    return value;
  }

  public void execute_void(ProgramChromosome c, int n, Object[] args) {
    check(c);
    boolean condition;
    if (m_type == CommandGene.IntegerClass) {
      condition = c.execute_int(n, 0, args) > 0;
    }
    else if (m_type == CommandGene.BooleanClass) {
      condition = c.execute_boolean(n, 0, args);
    }
    else if (m_type == CommandGene.LongClass) {
      condition = c.execute_long(n, 0, args) > 0;
    }
    else if (m_type == CommandGene.DoubleClass) {
      condition = c.execute_double(n, 0, args) > 0;
    }
    else if (m_type == CommandGene.FloatClass) {
      condition = c.execute_float(n, 0, args) > 0;
    }
    else {
      throw new IllegalStateException("IfElse: cannot process type "+m_type);
    }
    if (condition) {
      c.execute_void(n, 1, args);
    }
    else {
      c.execute_void(n, 2, args);
    }
  }

  /**
   * Determines which type a specific child of this command has.
   *
   * @param a_ind ignored here
   * @param a_chromNum index of child
   * @return type of the a_chromNum'th child
   *
   * @author Klaus Meffert
   * @since 3.2
   */
  public Class getChildType(IGPProgram a_ind, int a_chromNum) {
    if (a_chromNum == 0) {
      return m_type;
    }
    return CommandGene.VoidClass;
  }
}