modelrdb.java

jena2.5.4推理机系统的一种最基本实现 HP实验室出品

     * specify the database type when constructing the DBConnection.  Then use the call 
     * ModelRDB.createModel(IDBConnection)
     */

    public static ModelRDB create(IDBConnection dbcon, String databaseType) throws RDFRDBException {
        dbcon.setDatabaseType(databaseType);
        return createModel(dbcon, null, getDefaultModelProperties(dbcon));
    }

	/** 
	 * Returns a Jena Model containing model-specific properties.
	 * These describe the optimization/layout for this model in the database.
	 * 
	 * The returned Model is a copy, modifying it will have no
	 * immediate effect on the database.
	 * 
	 * 
	 * @since Jena 2.0
	 */
	
	public Model getModelProperties() {
		Model m = ModelFactory.createDefaultModel();
        Graph g = m.getGraph();
		ExtendedIterator it = m_graphRDB.getPropertyTriples();
		while (it.hasNext()) g.add( (Triple) it.next());
		return m;
	}
	
	/**
	 * Retrieve a default set of model customization properties
	 * 
	 * The returned default set of properties is suitable for use in a call to
	 * ModelRDB.create(..., modelProperties);
	 * 
     * @param dbcon a DBConnectionI specifying the database connection
     * @return Model containing default properties
     */
	
	public static Model getDefaultModelProperties( IDBConnection dbcon ) {
		return dbcon.getDefaultModelProperties();
	}
	
    /**
     * List the names of all models stored in the database
     * @return ExtendedIterator over the model names.
     */
     
     public static ExtendedIterator listModels(IDBConnection dbcon) throws RDFRDBException {
        return dbcon.getAllModelNames();
     }

    /** Close the Model and free up resources held.
     *
     *  <p>Not all implementations of Model require this method to be called.  But
     *     some do, so in general its best to call it when done with the object,
     *     rather than leave it to the finalizer.</p>
     */
    public void close() {
        m_graphRDB.close();
    }
    
    /**
     * Remove all traces of this particular Model from the database.
     */
    public void remove() throws RDFRDBException {
    	m_graphRDB.remove();
    }
     
	/**
	 * A convenience function to return the connection
	 */
	public IDBConnection getConnection() {
		return m_graphRDB.getConnection();
	}
	
	/**
	 * Remove all the statements from the database which are associated with just this model.
	 * This no longer reformats the database (which makes it safer and useful for multi-model
	 * databases) but means that it is not guaranteed to garbage collect the resource table.
     * @deprecated Since Jena 2.0 this call is not recommended (it's name
     * is misleading) - to clear an entire database use DBConnection.cleanDB, 
     * to remove just this Model use Model.remove().
     */
     public void clear() throws RDFRDBException {
     	remove();
     }

	/**
	 * Remove a named model from an existing multi-model database.
	 * Will throw an RDFDBException if the database layout does not support
	 * multiple models or if the database does not seem to formated.
	 * @param dbcon a DBConnectionI specifying the database connection
	 * @param name the name to give the newly created model
	 * @deprecated Since Jena 2.0, to remove a model use the ModelRDB.remove()
	 */
	public static void deleteModel(IDBConnection dbcon, String name) throws RDFRDBException {
		ModelRDB modelToDelete = ModelRDB.open(dbcon, name);
		modelToDelete.remove();
	}

	/**
	 * Loads all the statements for this model into an in-memory model.
	 * @return a ModelMem containing the whole of the RDB model
	 * @deprecated Since Jena 2.0, this call is not recommended.  Instead use
	 * the soon-to-be-released bulk-load functions.
	 */
	public Model loadAll()  {
		Model m = ModelFactory.createDefaultModel();
		for (StmtIterator i = this.listStatements(); i.hasNext(); ) {
			m.add( i.nextStatement() );
		}
		return m;
	}
	
	/**
	* Get the value of DoDuplicateCheck
	* @return bool boolean
	*/
	public boolean getDoDuplicateCheck() {
		return m_graphRDB.getDoDuplicateCheck();
	}
	/**
	* Set the value of DoDuplicateCheck.
	* @param bool boolean
	*/
	public void setDoDuplicateCheck(boolean bool) {
		m_graphRDB.setDoDuplicateCheck(bool);
	}
	
	/**
	 * Set the value of DoFastpath.
	 * @param val boolean
	 */
	public void setDoFastpath ( boolean val ) {
		m_graphRDB.setDoFastpath(val);
	}
	
	/**
	 * Get the value of DoFastpath.
	 * @return boolean
	 */
	public boolean getDoFastpath () {
		return m_graphRDB.getDoFastpath();
	}

	/**
	 * Set the value of QueryOnlyAsserted.
	 * @param opt boolean
	 */
	public void setQueryOnlyAsserted ( boolean opt ) {
		m_graphRDB.setQueryOnlyAsserted(opt);
	}

	/**
	 * Get the value of QueryOnlyAsserted.
	 * @return boolean
	 */
	public boolean getQueryOnlyAsserted() {
		return m_graphRDB.getQueryOnlyAsserted();
	}

	/**
	 * Set the value of QueryOnlyReified.
	 * @param opt boolean
	 */
	public void setQueryOnlyReified ( boolean opt ) {
		m_graphRDB.setQueryOnlyReified(opt);
	}

	/**
	 * Get the value of QueryOnlyReified.
	 * @return boolean
	 */
	public boolean getQueryOnlyReified() {
		return m_graphRDB.getQueryOnlyReified();
	}

	/**
	 * Set the value of QueryFullReified.
	 * @param opt boolean
	 */
	public void setQueryFullReified ( boolean opt ) {
		m_graphRDB.setQueryFullReified(opt);
	}

	/**
	 * Get the value of QueryFullReified.
	 * @return boolean
	 */
	public boolean getQueryFullReified() {
		return m_graphRDB.getQueryFullReified();
	}
	
	/**
	 * Set the value of DoImplicitJoin.
	 * @param val boolean
	 */
	public void setDoImplicitJoin ( boolean val ) {
		m_graphRDB.setDoImplicitJoin(val);
	}

	
}

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