/*
* Created on Jan 16, 2006 Copyright (C) 2001-5, Anthony Harrison anh23@pitt.edu
* (jactr.org) 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.production.condition;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jactr.core.buffer.IActivationBuffer;
import org.jactr.core.buffer.six.IStatusBuffer;
import org.jactr.core.model.IModel;
import org.jactr.core.production.request.SlotBasedRequest;
import org.jactr.core.slot.ISlot;
/**
* condition for checking the state of a buffer
*
* @author developer
*/
public class QueryCondition extends AbstractBufferCondition implements
Cloneable
{
/**
* Logger definition
*/
static private final Log LOGGER = LogFactory.getLog(QueryCondition.class);
public QueryCondition(String bufferName)
{
this(bufferName, Collections.EMPTY_LIST);
}
public QueryCondition(String bufferName, Collection<? extends ISlot> slots)
{
super(bufferName);
setRequest(new SlotBasedRequest(slots));
}
@Override
public QueryCondition clone()
{
return new QueryCondition(getBufferName(),getRequest().getSlots());
}
public QueryCondition clone(IModel model, Map<String,Object> bindings) throws CannotMatchException
{
IActivationBuffer buffer = getActivationBuffer(model);
if(!(buffer instanceof IStatusBuffer))
throw new CannotMatchException(getBufferName()+" has no status slots to check");
return clone();
}
// /**
// * test and bind the conditional slots
// *
// * @see org.jactr.core.production.condition.ICondition#bind(org.jactr.core.model.IModel,
// * Map)
// */
// protected void checkAndBindSlots(IModel model,
// Map<String, Object> variableBindings) throws CannotMatchException
// {
// IActivationBuffer buffer = model.getActivationBuffer(getBufferName());
// if (buffer instanceof IStatusBuffer)
// {
// IStatusBuffer statusCapableBuffer = (IStatusBuffer) buffer;
// Collection<IConditionalSlot> querySlots = getConditionalSlots();
// /*
// * check the query slots for variables that need resolving
// */
// for (IConditionalSlot conditionalSlot : querySlots)
// if (conditionalSlot.isVariable())
// {
// String variableName = (String) conditionalSlot.getValue();
// variableName = variableName.toLowerCase();
// if (variableBindings.containsKey(variableName))
// {
// Object value = variableBindings.get(variableName);
// if (LOGGER.isDebugEnabled())
// LOGGER.debug("resolving " + variableName + " to " + value);
// conditionalSlot.setValue(value);
// clearToString();
// }
// else
// {
// /*
// * variable has not been bound.. leave until down below...
// */
// }
// }
//
// /*
// * this returns a list of slots that could be removed if this were a
// * hybrid condition (a ChunkTypeCondition that also checks the status
// * slots)
// */
// Collection<IConditionalSlot> actualStatusSlots = statusCapableBuffer
// .matchesStatus(querySlots, variableBindings, true);
//
// if (actualStatusSlots.size() != querySlots.size())
// {
// if (LOGGER.isDebugEnabled())
// LOGGER.debug("There were unknown slots in the condition ("
// + querySlots + ") buffer recognized " + actualStatusSlots);
// throw new CannotMatchException(
// "There were unknown slots in the condition (" + querySlots
// + ") buffer recognized " + actualStatusSlots);
// }
//
// for (IConditionalSlot slot : actualStatusSlots)
// if (slot.isVariable())
// {
// /*
// * ok, now let's do some binding if there is anything left to bind
// */
// String variableName = (String) slot.getValue();
// variableName = variableName.toLowerCase();
// ISlot statusSlot = statusCapableBuffer.getStatusSlot(slot.getName());
// Object value = statusSlot.getValue();
// if (value != null)
// {
// if (LOGGER.isDebugEnabled())
// LOGGER.debug("Resolving " + variableName + " to " + value);
// slot.setValue(value);
// clearToString();
// variableBindings.put(variableName, value);
// }
// }
//
// }
// else
// throw new CannotMatchException(getBufferName()
// + " must be a valid 6.0 buffer with status support");
// }
// /**
// * @see org.jactr.core.production.condition.ICondition#bind(org.jactr.core.model.IModel,
// * Map)
// */
// public ICondition bind(IModel model, Map<String, Object> variableBindings)
// throws CannotMatchException
// {
// QueryCondition qc = new QueryCondition(getBufferName());
// qc.duplicateSlots(getSlots());
// qc.checkAndBindSlots(model, variableBindings);
// return qc;
// }
public int bind(IModel model, Map<String,Object> variableBindings, boolean isIterative) throws CannotMatchException
{
IActivationBuffer buffer = getActivationBuffer(model);
if(!(buffer instanceof IStatusBuffer))
throw new CannotMatchException(getBufferName()+" has no status slots to check");
return ((IStatusBuffer) buffer).bind(getRequest(), variableBindings, isIterative);
}
}