com.cloudera.impala.extdatasource.ApiVersion.java Source code

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Here is the source code for com.cloudera.impala.extdatasource.ApiVersion.java

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// Copyright 2014 Cloudera Inc.
//
// 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.

package com.cloudera.impala.extdatasource;

import com.cloudera.impala.extdatasource.v1.ExternalDataSource;
import com.google.common.base.Strings;

/**
 * Enumerates the valid versions of the {@link ExternalDataSource} API.
 */
public enum ApiVersion {
    V1(com.cloudera.impala.extdatasource.v1.ExternalDataSource.class);

    private final Class<?> apiInterface_;

    ApiVersion(Class<?> interfaceClass) {
        apiInterface_ = interfaceClass;
    }

    /**
     * Gets the {@link Class} for the interface this API version represents.
     */
    public Class<?> getApiInterface() {
        return apiInterface_;
    }

    /**
     * Parses the API version from the string. Is case-insensitive.
     * @return The value of the ApiVersion enum represented by the string or null
     *         if the string is not a valid ApiVersion.
     */
    public static ApiVersion parseApiVersion(String apiVersionString) {
        if (Strings.isNullOrEmpty(apiVersionString))
            return null;
        try {
            return valueOf(apiVersionString.toUpperCase());
        } catch (IllegalArgumentException ex) {
            return null;
        }
    }
}