org.jgap.gp.function.Push.java Source code

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Here is the source code for org.jgap.gp.function.Push.java

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/*
 * This file is part of JGAP.
 *
 * JGAP offers a dual license model containing the LGPL as well as the MPL.
 *
 * For licensing 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.apache.commons.lang.builder.*;
import org.jgap.*;
import org.jgap.gp.*;
import org.jgap.gp.impl.*;
import org.jgap.util.*;

/**
 * Pushes a value onto the stack.
 *
 * @author Klaus Meffert
 * @since 3.0
 */
public class Push extends CommandGene implements ICloneable {
    /** String containing the CVS revision. Read out via reflection!*/
    private final static String CVS_REVISION = "$Revision: 1.13 $";

    private Class m_type;

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

    public Push(final GPConfiguration a_conf, Class a_type, int a_subReturnType, int a_subChildType)
            throws InvalidConfigurationException {
        super(a_conf, 1, CommandGene.VoidClass, a_subReturnType, a_subChildType);
        m_type = a_type;
    }

    public String toString() {
        return "push &1";
    }

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

    public void execute_void(ProgramChromosome c, int n, Object[] args) {
        check(c);
        int value = c.execute_int(n, 0, args);
        // Push onto stack.
        // ----------------
        pushIt(new Integer(value));
    }

    public int execute_int(ProgramChromosome c, int n, Object[] args) {
        check(c);
        int value = c.execute_int(n, 0, args);
        // Push onto stack.
        // ----------------
        pushIt(new Integer(value));
        return value;
    }

    public long execute_long(ProgramChromosome c, int n, Object[] args) {
        check(c);
        long value = c.execute_long(n, 0, args);
        // Push onto stack.
        // ----------------
        pushIt(new Long(value));
        return value;
    }

    public double execute_double(ProgramChromosome c, int n, Object[] args) {
        check(c);
        double value = c.execute_double(n, 0, args);
        pushIt(new Double(value));
        return value;
    }

    public float execute_float(ProgramChromosome c, int n, Object[] args) {
        check(c);
        float value = c.execute_float(n, 0, args);
        pushIt(new Float(value));
        return value;
    }

    public Object execute_object(ProgramChromosome c, int n, Object[] args) {
        check(c);
        Object value = c.execute_object(n, 0, args);
        pushIt(value);
        return value;
    }

    public boolean isAffectGlobalState() {
        return true; /**@todo use this information*/
    }

    public boolean isValid(ProgramChromosome a_program) {
        /**@todo consider n (execute_int...)*/
        return a_program.getCommandOfClass(0, Pop.class) >= 0;
    }

    /**
     * Helper method.
     * @param a_value the value to push onto the stack
     */
    protected void pushIt(Object a_value) {
        getGPConfiguration().pushToStack(a_value);
    }

    public Class getChildType(IGPProgram a_ind, int a_chromNum) {
        return m_type;
    }

    /**
     * The compareTo-method.
     *
     * @param a_other the other object to compare
     * @return -1, 0, 1
     *
     * @author Klaus Meffert
     * @since 3.0
     */
    public int compareTo(Object a_other) {
        int result = super.compareTo(a_other);
        if (result != 0) {
            return result;
        }
        Push other = (Push) a_other;
        return new CompareToBuilder().append(m_type, other.m_type).toComparison();
    }

    /**
     * The equals-method.
     *
     * @param a_other the other object to compare
     * @return true if the objects are seen as equal
     *
     * @author Klaus Meffert
     * @since 3.0
     */
    public boolean equals(Object a_other) {
        try {
            Push other = (Push) a_other;
            return super.equals(a_other) && new EqualsBuilder().append(m_type, other.m_type).isEquals();
        } catch (ClassCastException cex) {
            return false;
        }
    }

    /**
     * Clones the object. Simple and straight forward implementation here.
     *
     * @return cloned instance of this object
     *
     * @author Klaus Meffert
     * @since 3.4
     */
    public Object clone() {
        try {
            Push result = new Push(getGPConfiguration(), m_type, getSubReturnType(), getSubChildType(0));
            return result;
        } catch (Exception ex) {
            throw new CloneException(ex);
        }
    }
}