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JDBC Driver for Accessing Treasure Data

There is a newer version: 0.5.11

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package com.treasuredata.jdbc;

/**
 * Optional value representation
 */
public final class Option
{
    private static final Option EMPTY = new Option(null);

    private final T value;

    private Option(T value)
    {
        this.value = value;
    }

    public boolean isDefined() { return value != null; }

    public boolean isEmpty() { return value == null; }

    public T get() { return value; }

    public T getOrElse(T defaultValue)
    {
        return isEmpty() ? defaultValue : get();
    }

    public static  Option of(T obj)
    {
        if (obj == null) {
            return (Option) EMPTY;
        }
        else {
            return new Option(obj);
        }
    }

    public static  Option empty()
    {
        return (Option) EMPTY;
    }
}