org.jactr.core.slot.DefaultConditionalSlot.java Source code

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Here is the source code for org.jactr.core.slot.DefaultConditionalSlot.java

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/*
 * Created on Sep 21, 2004 Copyright (C) 2001-4, Anthony Harrison anh23@pitt.edu
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version. This library is distributed in the hope that it will be
 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 * General Public License for more details. You should have received a copy of
 * the GNU Lesser General Public License along with this library; if not, write
 * to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 * 02111-1307 USA
 */
package org.jactr.core.slot;

import java.util.Collection;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @author harrison TODO To change the template for this generated type comment
 *         go to Window - Preferences - Java - Code Style - Code Templates
 */
public class DefaultConditionalSlot extends DefaultMutableSlot implements IConditionalSlot {

    /**
     * Logger definition
     */

    static private final transient Log LOGGER = LogFactory.getLog(DefaultConditionalSlot.class);

    static public final double EPSILON = 0.0001;

    private int _condition = EQUALS;

    /**
     * @param name
     * @param value
     */
    public DefaultConditionalSlot(String name, Object value) {
        super(name, value);
    }

    public DefaultConditionalSlot(String name, int condition, Object value) {
        this(name, value);
        setCondition(condition);
    }

    public DefaultConditionalSlot(ISlot slot) {
        super(slot);
        if (slot instanceof IConditionalSlot) {
            IConditionalSlot cs = (IConditionalSlot) slot;
            setCondition(cs.getCondition());
        }
    }

    @Override
    public DefaultConditionalSlot clone() {
        return new DefaultConditionalSlot(this);
    }

    /**
     * @see org.jactr.core.slot.IConditionalSlot#getCondition()
     */
    public int getCondition() {
        return _condition;
    }

    /**
     * @see org.jactr.core.slot.IConditionalSlot#setCondition(int)
     */
    public void setCondition(int condition) {
        if (condition >= EQUALS && condition <= NOT_EQUALS) {
            _condition = condition;
            clearToString();
        }
    }

    public boolean matchesCondition(Object test) {
        if (test instanceof ISlot)
            test = ((ISlot) test).getValue();

        if (LOGGER.isDebugEnabled()) {
            StringBuffer sb = new StringBuffer("Test value : ");
            sb.append(test);
            if (test != null) {
                sb.append(", ");
                sb.append(test.getClass().getName());
                sb.append(", ");
                sb.append(test.hashCode());
            }
            LOGGER.debug(sb.toString());
            sb.delete(0, sb.length());

            sb.append("Cond value : ");
            Object tmp = getValue();
            sb.append(tmp);
            if (tmp != null) {
                sb.append(", ");
                sb.append(tmp.getClass().getName());
                sb.append(", ");
                sb.append(tmp.hashCode());
            }
            LOGGER.debug(sb.toString());
        }

        boolean rtn = false;
        try {
            switch (_condition) {
            case EQUALS:
                rtn = equalValues(test);
                break;

            case LESS_THAN:
                rtn = lessThan(test);
                break;

            case LESS_THAN_EQUALS:
                rtn = equalValues(test) | lessThan(test);
                break;

            case GREATER_THAN:
                rtn = greaterThan(test);
                break;

            case GREATER_THAN_EQUALS:
                rtn = equalValues(test) | greaterThan(test);
                break;

            case NOT_EQUALS:
                rtn = !equalValues(test);
                break;

            case WITHIN:
                rtn = within(test);
                break;
            }
        } catch (Exception e) {
            if (LOGGER.isDebugEnabled())
                LOGGER.debug("Unknown failure comparing " + this + " with " + test, e);
        }

        if (LOGGER.isDebugEnabled())
            LOGGER.debug("matchesCondition " + this + " " + test + " : " + rtn);

        return rtn;
    }

    @Override
    public boolean equalValues(Object value) {
        boolean rtn = super.equalValues(value);
        if (!rtn && value instanceof Number && getValue() instanceof Number) {
            double myValue = ((Number) getValue()).doubleValue();
            double hisValue = ((Number) value).doubleValue();
            return Math.abs(myValue - hisValue) <= EPSILON;
        }
        return rtn;
    }

    /**
     * @param value
     * @return
     */
    private boolean lessThan(Object value) {
        double selfValue = ((Number) getValue()).doubleValue();
        double otherValue = ((Number) value).doubleValue();
        return otherValue < selfValue;
    }

    private boolean greaterThan(Object value) {
        double selfValue = ((Number) getValue()).doubleValue();
        double otherValue = ((Number) value).doubleValue();
        return otherValue > selfValue;
    }

    @SuppressWarnings("unchecked")
    private boolean within(Object value) {
        // we check to see if getValue() is in the collection
        Collection collection = (Collection) value;
        return collection.contains(getValue());
    }

    @Override
    protected String createToString() {

        String condition = "=";
        switch (getCondition()) {
        case NOT_EQUALS:
            condition = "!=";
            break;
        case LESS_THAN:
            condition = "<";
            break;
        case LESS_THAN_EQUALS:
            condition = "<=";
            break;
        case GREATER_THAN:
            condition = ">";
            break;
        case GREATER_THAN_EQUALS:
            condition = ">=";
            break;
        case WITHIN:
            condition = "w/in";
            break;
        }

        return String.format("%s %s %s", getName(), condition, getValue());
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = super.hashCode();
        result = prime * result + _condition;
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (!super.equals(obj))
            return false;
        if (getClass() != obj.getClass())
            return false;
        DefaultConditionalSlot other = (DefaultConditionalSlot) obj;
        if (_condition != other._condition)
            return false;
        return true;
    }

}