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OWLAPI-based implementation of the OntoDriver API
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/*
 * JOPA
 * Copyright (C) 2024 Czech Technical University in Prague
 *
 * 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 3.0 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.
 */
package cz.cvut.kbss.ontodriver.owlapi;

import cz.cvut.kbss.ontodriver.Connection;
import cz.cvut.kbss.ontodriver.OntologyStorageProperties;
import cz.cvut.kbss.ontodriver.ReloadableDataSource;
import cz.cvut.kbss.ontodriver.exception.OntoDriverException;

import java.util.Collections;
import java.util.Map;
import java.util.Objects;

/**
 * Main entry point to this OWLAPI-based OntoDriver.
 *
 * @author ledvima1
 */
public class OwlapiDataSource implements ReloadableDataSource {

    private OntologyStorageProperties storageProperties;
    private Map properties;

    private volatile boolean open = true;
    private boolean connected = false;

    private OwlapiDriver driver;

    @Override
    public synchronized Connection getConnection() throws OntoDriverException {
        ensureOpen();
        if (storageProperties == null) {
            throw new IllegalStateException("OntoDriver is not properly initialized. Cannot acquire connection.");
        }
        if (!connected) {
            connect();
        }
        return driver.acquireConnection();
    }

    private void ensureOpen() {
        if (!open) {
            throw new IllegalStateException("The OntoDriver is closed.");
        }
    }

    private void connect() {
        this.driver = new OwlapiDriver(storageProperties, properties != null ? properties : Collections.emptyMap());
        this.connected = true;
    }

    @Override
    public void setStorageProperties(OntologyStorageProperties storageProperties) {
        this.storageProperties = Objects.requireNonNull(storageProperties);
    }

    @Override
    public void setProperties(Map properties) {
        this.properties = Objects.requireNonNull(properties);
    }

    @Override
    public synchronized void reload() throws OntoDriverException {
        ensureOpen();
        if (connected) {
            driver.reloadData();
        }
    }

    @Override
    public synchronized void close() throws OntoDriverException {
        if (!open) {
            return;
        }
        try {
            if (connected) {
                driver.close();
            }
        } finally {
            this.open = false;
        }
    }

    @Override
    public boolean isOpen() {
        return open;
    }
}