/*
* Created on Sep 22, 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.Collection;
import java.util.Collections;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jactr.core.chunk.IChunk;
import org.jactr.core.chunktype.IChunkType;
import org.jactr.core.model.IModel;
import org.jactr.core.production.VariableBindings;
import org.jactr.core.production.condition.match.EmptyBufferMatchFailure;
import org.jactr.core.production.request.ChunkTypeRequest;
import org.jactr.core.slot.ISlot;
/**
* matches the contents of a buffer to a specific chunktype and slot values
*
* @author harrison
*/
public class ChunkTypeCondition extends AbstractBufferCondition
{
/**
* Logger definition
*/
static private final Log LOGGER = LogFactory.getLog(ChunkTypeCondition.class);
private IChunkType _chunkType;
public ChunkTypeCondition(String bufferName, IChunkType chunkType)
{
this(bufferName, chunkType, Collections.EMPTY_LIST);
}
public ChunkTypeCondition(String bufferName, IChunkType chunkType,
Collection<? extends ISlot> slots)
{
super(bufferName);
_chunkType = chunkType;
setRequest(new ChunkTypeRequest(chunkType, slots));
}
public ChunkTypeCondition clone(IModel model, VariableBindings bindings)
throws CannotMatchException
{
/*
* check the provisional chunk binding
*/
if (!bindings.isBound("=" + getBufferName()))
throw new CannotMatchException(new EmptyBufferMatchFailure(this));
return new ChunkTypeCondition(getBufferName(), getChunkType(), getRequest()
.getSlots());
}
public IChunkType getChunkType()
{
return _chunkType;
}
@Override
public ChunkTypeRequest getRequest()
{
return (ChunkTypeRequest) super.getRequest();
}
@Override
protected String createToString()
{
return String.format("ChunkTypeCondition(%s, %s, %s)", getBufferName(),
getChunkType(), getSlots());
}
public int bind(IModel model, VariableBindings variableBindings,
boolean isIterative) throws CannotMatchException
{
/*
* check the provisional chunk binding
*/
if (!variableBindings.isBound("=" + getBufferName()))
throw new CannotMatchException(new EmptyBufferMatchFailure(this));
IChunk testChunk = (IChunk) variableBindings.get("=" + getBufferName());
try
{
return getRequest().bind(testChunk, model, variableBindings, isIterative);
}
catch (CannotMatchException cme)
{
cme.getMismatch().setCondition(this);
throw cme;
}
}
@Override
public int hashCode()
{
final int prime = 31;
int result = super.hashCode();
result = prime * result + (_chunkType == null ? 0 : _chunkType.hashCode());
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;
ChunkTypeCondition other = (ChunkTypeCondition) obj;
if (_chunkType == null)
{
if (other._chunkType != null) return false;
}
else if (!_chunkType.equals(other._chunkType)) return false;
return true;
}
}