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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
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package org.glassfish.jdbcruntime;

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;

/**
 * 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 = "java:comp/DefaultDataSource";
    static final String DEFAULT_DATASOURCE_PHYS = "jdbc/__default";
    private DataSource dataSource;

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

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

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