com.dangdang.ddframe.rdb.sharding.constant.DatabaseType.java Source code

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Here is the source code for com.dangdang.ddframe.rdb.sharding.constant.DatabaseType.java

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/*
 * Copyright 1999-2015 dangdang.com.
 * <p>
 * Licensed 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.
 * </p>
 */

package com.dangdang.ddframe.rdb.sharding.constant;

import com.google.common.base.Optional;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterators;

import java.util.Arrays;

/**
 * ??.
 * 
 * @author zhangliang
 */
public enum DatabaseType {

    H2("H2"), MySQL("MySQL"), Oracle("Oracle"), SQLServer("Microsoft SQL Server"), PostgreSQL("PostgreSQL");

    private final String productName;

    DatabaseType(final String productName) {
        this.productName = productName;
    }

    /**
     * ??.
     * 
     * @param databaseProductName ?
     * @return ?
     */
    public static DatabaseType valueFrom(final String databaseProductName) {
        Optional<DatabaseType> databaseTypeOptional = Iterators
                .tryFind(Arrays.asList(DatabaseType.values()).iterator(), new Predicate<DatabaseType>() {

                    @Override
                    public boolean apply(final DatabaseType input) {
                        return input.productName.equals(databaseProductName);
                    }
                });
        if (databaseTypeOptional.isPresent()) {
            return databaseTypeOptional.get();
        }
        throw new UnsupportedOperationException(
                String.format("Can not support database type [%s].", databaseProductName));
    }
}