org.semanticweb.HermiT.tableau.TupleTable Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of org.semanticweb.hermit Show documentation

HermiT is reasoner for ontologies written using the Web Ontology Language (OWL). Given an OWL file, HermiT can determine whether or not the ontology is consistent, identify subsumption relationships between classes, and much more. This is the maven build of HermiT and is designed for people who wish to use HermiT from within the OWL API. It is now versioned in the main HermiT version repository, although not officially supported by the HermiT developers. The version number of this package is a composite of the HermiT version and a value representing the OWLAPI release it is compatible with. Note that the group id for the upstream HermiT is com.hermit-reasoner, while this fork is released under net.sourceforge.owlapi. This fork exists to allow HermiT users to use newer OWLAPI versions than the ones supported by the original HermiT codebase. This package includes the Jautomata library (http://jautomata.sourceforge.net/), and builds with it directly. This library appears to be no longer under active development, and so a "fork" seems appropriate. No development is intended or anticipated on this code base.

The newest version!

/* Copyright 2008, 2009, 2010 by the Oxford University Computing Laboratory

   This file is part of HermiT.

   HermiT 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 3 of the License, or
   (at your option) any later version.

   HermiT 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 HermiT.  If not, see .
*/
package org.semanticweb.HermiT.tableau;

import java.io.Serializable;

/**
 * The actual implementation of the tuple tables used in the ExtensionTable
 * class.
 */
public final class TupleTable implements Serializable {
    private static final long serialVersionUID=-7712458276004062803L;

    protected static final int PAGE_SIZE=512;   // Must be a power of two!

    protected final int m_arity;
    protected Page[] m_pages;
    protected int m_numberOfPages;
    protected int m_tupleCapacity;
    protected int m_firstFreeTupleIndex;

    /**
     * @param arity arity
     */
    public TupleTable(int arity) {
        m_arity=arity;
        clear();
    }
    /**
     * @return size
     */
    public int sizeInMemory() {
        int size=m_pages.length*4;
        for (int i=m_pages.length-1;i>=0;--i)
            if (m_pages[i]!=null)
                size+=m_pages[i].sizeInMemory();
        return size;
    }
    /**
     * @return free tuple index
     */
    public int getFirstFreeTupleIndex() {
        return m_firstFreeTupleIndex;
    }
    /**
     * @param tupleBuffer tupleBuffer
     * @return index of added tuple
     */
    public int addTuple(Object[] tupleBuffer) {
        int newTupleIndex=m_firstFreeTupleIndex;
        if (newTupleIndex==m_tupleCapacity) {
            if (m_numberOfPages==m_pages.length) {
                Page[] newPages=new Page[m_numberOfPages*3/2];
                System.arraycopy(m_pages,0,newPages,0,m_numberOfPages);
                m_pages=newPages;
            }
            m_pages[m_numberOfPages++]=new Page(m_arity);
            m_tupleCapacity+=PAGE_SIZE;
        }
        m_pages[newTupleIndex / PAGE_SIZE].storeTuple((newTupleIndex % PAGE_SIZE)*m_arity,tupleBuffer);
        m_firstFreeTupleIndex++;
        return newTupleIndex;
    }
    /**
     * @param tupleBuffer tupleBuffer
     * @param tupleIndex tupleIndex
     * @param compareLength compareLength
     * @return true if equal
     */
    public boolean tupleEquals(Object[] tupleBuffer,int tupleIndex,int compareLength) {
        return m_pages[tupleIndex / PAGE_SIZE].tupleEquals(tupleBuffer,(tupleIndex % PAGE_SIZE)*m_arity,compareLength);
    }
    /**
     * @param tupleBuffer tupleBuffer
     * @param positionIndexes positionIndexes
     * @param tupleIndex tupleIndex
     * @param compareLength compareLength
     * @return true if equals
     */
    public boolean tupleEquals(Object[] tupleBuffer,int[] positionIndexes,int tupleIndex,int compareLength) {
        return m_pages[tupleIndex / PAGE_SIZE].tupleEquals(tupleBuffer,positionIndexes,(tupleIndex % PAGE_SIZE)*m_arity,compareLength);
    }
    /**
     * @param tupleBuffer tupleBuffer
     * @param tupleIndex tupleIndex
     */
    public void retrieveTuple(Object[] tupleBuffer,int tupleIndex) {
        m_pages[tupleIndex / PAGE_SIZE].retrieveTuple((tupleIndex % PAGE_SIZE)*m_arity,tupleBuffer);
    }
    /**
     * @param tupleIndex tupleIndex
     * @param objectIndex objectIndex
     * @return object
     */
    public Object getTupleObject(int tupleIndex,int objectIndex) {
        assert objectIndex < m_arity;
        return m_pages[tupleIndex / PAGE_SIZE].m_objects[(tupleIndex % PAGE_SIZE)*m_arity+objectIndex];
    }
    /**
     * @param tupleIndex tupleIndex
     * @param objectIndex objectIndex
     * @param object object
     */
    public void setTupleObject(int tupleIndex,int objectIndex,Object object) {
        m_pages[tupleIndex / PAGE_SIZE].m_objects[(tupleIndex % PAGE_SIZE)*m_arity+objectIndex]=object;
    }
    /**
     * @param newFirstFreeTupleIndex newFirstFreeTupleIndex
     */
    public void truncate(int newFirstFreeTupleIndex) {
        m_firstFreeTupleIndex=newFirstFreeTupleIndex;
    }
    /**
     * @param tupleIndex tupleIndex
     */
    public void nullifyTuple(int tupleIndex) {
        m_pages[tupleIndex / PAGE_SIZE].nullifyTuple((tupleIndex % PAGE_SIZE)*m_arity);
    }
    /**Clear.*/
    public void clear() {
        m_pages=new Page[10];
        m_numberOfPages=1;
        m_pages[0]=new Page(m_arity);
        m_tupleCapacity=m_numberOfPages*PAGE_SIZE;
        m_firstFreeTupleIndex=0;
    }

    protected static final class Page implements Serializable {
        private static final long serialVersionUID=2239482172592108644L;

        public final int m_arity;
        public final Object[] m_objects;

        public Page(int arity) {
            m_arity=arity;
            m_objects=new Object[m_arity*PAGE_SIZE];
        }
        public int sizeInMemory() {
            return m_objects.length*4;
        }
        public void storeTuple(int tupleStartIndex,Object[] tupleBuffer) {
            System.arraycopy(tupleBuffer,0,m_objects,tupleStartIndex,tupleBuffer.length);
        }
        public void retrieveTuple(int tupleStartIndex,Object[] tupleBuffer) {
            System.arraycopy(m_objects,tupleStartIndex,tupleBuffer,0,tupleBuffer.length);
        }
        public void nullifyTuple(int tupleStartIndex) {
            for (int index=0;index=0) {
                if (!tupleBuffer[sourceIndex].equals(m_objects[targetIndex]))
                    return false;
                sourceIndex--;
                targetIndex--;
            }
            return true;
        }
        public boolean tupleEquals(Object[] tupleBuffer,int[] positionIndexes,int tupleStartIndex,int compareLength) {
            int sourceIndex=compareLength-1;
            int targetIndex=tupleStartIndex+sourceIndex;
            while (sourceIndex>=0) {
                if (!tupleBuffer[positionIndexes[sourceIndex]].equals(m_objects[targetIndex]))
                    return false;
                sourceIndex--;
                targetIndex--;
            }
            return true;
        }
    }
}