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/*
 * Copyright (c) 2012, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package org.glassfish.jdbcruntime;

import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;

import org.glassfish.api.naming.DefaultResourceProxy;
import org.glassfish.api.naming.NamedNamingObjectProxy;
import org.glassfish.api.naming.NamespacePrefixes;
import org.jvnet.hk2.annotations.Service;

import static org.glassfish.api.naming.SimpleJndiName.JNDI_CTX_JAVA_COMPONENT;

/**
 * Naming Object Proxy to handle the Default Data Source. Maps to a
 * pre-configured data source, when binding for a datasource reference is absent
 * in the @Resource annotation.
 *
 * @author Shalini M
 */
@Service
@NamespacePrefixes(DefaultDataSource.DEFAULT_DATASOURCE)
public class DefaultDataSource implements NamedNamingObjectProxy, DefaultResourceProxy {

    static final String DEFAULT_DATASOURCE = JNDI_CTX_JAVA_COMPONENT + "DefaultDataSource";
    static final String DEFAULT_DATASOURCE_PHYS = "jdbc/__default";

    private DataSource dataSource;

    @Override
    public Object handle(String name) throws NamingException {
        if (dataSource == null) {
            // cache the datasource to avoid JNDI lookup overheads
            dataSource = (DataSource) new InitialContext().lookup(DEFAULT_DATASOURCE_PHYS);
        }

        return dataSource;
    }

    @Override
    public String getPhysicalName() {
        return DEFAULT_DATASOURCE_PHYS;
    }

    @Override
    public String getLogicalName() {
        return DEFAULT_DATASOURCE;
    }
}