/*
* 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.production.condition;
import java.util.ArrayList;
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.chunk.IChunk;
import org.jactr.core.chunk.ISymbolicChunk;
import org.jactr.core.production.action.DefaultAction;
import org.jactr.core.production.request.IRequest;
import org.jactr.core.production.request.SlotBasedRequest;
import org.jactr.core.slot.DefaultConditionalSlot;
import org.jactr.core.slot.IConditionalSlot;
import org.jactr.core.slot.ISlot;
import org.jactr.core.slot.ISlotContainer;
import org.jactr.core.utils.collections.CachedCollection;
/**
* @author harrison TODO To change the template for this generated type comment
* go to Window - Preferences - Java - Code Style - Code Templates
*/
public abstract class AbstractSlotCondition implements ICondition,
ISlotContainer
{
private static transient Log LOGGER = LogFactory
.getLog(AbstractSlotCondition.class
.getName());
// private Collection<IConditionalSlot> _slotList;
private String _toString;
private SlotBasedRequest _request;
public AbstractSlotCondition()
{
}
protected void setRequest(SlotBasedRequest request)
{
_request = request;
}
protected SlotBasedRequest getRequest()
{
return _request;
}
// synchronized protected void duplicateSlots(Collection<? extends ISlot>
// slots)
// {
// if (_slotList == null)
// _slotList = new CachedCollection<IConditionalSlot>(
// new ArrayList<IConditionalSlot>(slots.size()));
//
// for (ISlot slot : slots)
// addSlot(slot);
// }
//
// /**
// * @param referenceChunk
// * @param bindings
// * @throws CannotMatchException
// */
// protected void checkAndBindSlots(IChunk referenceChunk,
// Map<String, Object> bindings) throws CannotMatchException
// {
// ISymbolicChunk symbolicChunk = referenceChunk.getSymbolicChunk();
// for (IConditionalSlot conditionalSlot : getConditionalSlots())
// if (!conditionalSlot.getName().startsWith(":"))
// {
// /*
// * we need to make sure that we are only checking real slots and not
// * status slots. The status slots should be checked before we even get
// * here if they exist
// */
// ISlot referenceSlot = symbolicChunk.getSlot(conditionalSlot.getName());
//
// if (conditionalSlot.isVariable())
// {
// String variableName = (String) conditionalSlot.getValue();
// variableName = variableName.toLowerCase();
// Object slotValue = referenceSlot.getValue();
// if (!bindings.containsKey(variableName) && slotValue != null)
// {
// /*
// * variable has not yet been bound, so we snag the value from
// * referenceChunk
// */
// bindings.put(variableName, slotValue);
// if (LOGGER.isDebugEnabled())
// LOGGER.debug(variableName
// + " was not previously resolved, binding to " + slotValue);
//
// /*
// * we now change the value of the slot
// */
// conditionalSlot.setValue(slotValue);
// clearToString();
// }
// else
// {
// /*
// * variable has been bound
// */
// Object resolvedValue = DefaultAction
// .resolve(variableName, bindings);
//
// if (resolvedValue != null)
// {
// conditionalSlot.setValue(resolvedValue);
// clearToString();
// if (LOGGER.isDebugEnabled())
// LOGGER.debug("resolved " + variableName + " to "
// + resolvedValue);
// }
// }
// }
//
// if (!conditionalSlot.matchesCondition(referenceSlot))
// {
// StringBuilder msg = new StringBuilder(100);
// msg.append(referenceChunk.toString());
// msg.append(".").append(referenceSlot).append(
// " doesn't match the conditional slot ");
// msg.append(conditionalSlot);
// String message = msg.toString();
//
// if (LOGGER.isDebugEnabled()) LOGGER.debug(message);
//
// throw new CannotMatchException(message);
// }
//
// if (LOGGER.isDebugEnabled())
// LOGGER.debug(referenceChunk + "." + referenceSlot + " does match "
// + conditionalSlot);
// }
// }
/**
* @see org.jactr.core.production.condition.ICondition#dispose()
*/
synchronized public void dispose()
{
// if (_slotList != null) _slotList.clear();
}
/**
* violates the ISlotContainer#getSlots() contract that they be a copy why?
* because each condition is fully duplicated during instantiation so we will
* be the only modifiers of this..
*
* @returns an unmodifiable collection of the <b>actual</b> Slots backing
* this.
* @see org.jactr.core.slot.ISlotContainer#getSlots()
*/
synchronized public Collection<? extends ISlot> getSlots()
{
// if (_slotList == null) return Collections.EMPTY_LIST;
//
// return Collections.unmodifiableCollection(_slotList);
if (_request != null) return _request.getSlots();
return Collections.emptyList();
}
// /**
// * the actual collections of the conditional slots - so changing these, will
// * change the pattern used..
// *
// * @return
// */
// synchronized public Collection<IConditionalSlot> getConditionalSlots()
// {
// // if (_slotList == null) return Collections.EMPTY_LIST;
// //
// // return Collections.unmodifiableCollection(_slotList);
// return getRequest().getConditionalSlots();
// }
public Collection<ISlot> getSlots(Collection<ISlot> container)
{
// if(container==null)
// {
// if(_slotList!=null)
// container = new ArrayList<ISlot>(_slotList.size()+1);
// else
// container = new ArrayList<ISlot>();
// }
//
// if (_slotList != null) container.addAll(_slotList);
// return container;
if (_request != null) return _request.getSlots(container);
return container;
}
public Collection<? extends IConditionalSlot> getConditionalSlots()
{
if (_request != null) return _request.getConditionalSlots();
return Collections.emptyList();
}
/**
* @see org.jactr.core.slot.ISlotContainer#addSlot(ISlot)
*/
synchronized public void addSlot(ISlot slot)
{
// if (_slotList == null)
// _slotList = new CachedCollection<IConditionalSlot>(
// new ArrayList<IConditionalSlot>());
//
// /*
// * if slot is conditional slot, DefaultConditionalSlot will snag the
// * appropriate values
// */
// _slotList.add(new DefaultConditionalSlot(slot));
getRequest().addSlot(slot);
clearToString();
}
/**
* @see org.jactr.core.slot.ISlotContainer#removeSlot(ISlot)
*/
synchronized public void removeSlot(ISlot slot)
{
getRequest().removeSlot(slot);
// if (_slotList != null)
// {
// _slotList.remove(slot);
clearToString();
// }
}
@Override
public String toString()
{
synchronized (this)
{
if (_toString == null) _toString = createToString();
}
return _toString;
}
protected void clearToString()
{
synchronized (this)
{
_toString = null;
}
}
synchronized protected String createToString()
{
// if (_slotList == null) return "";
return getSlots().toString();
}
}