/* 
 * 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 parquet.hadoop.metadata;

import parquet.format.CompressionCodec;
import parquet.hadoop.codec.CompressionCodecNotSupportedException;

public enum CompressionCodecName {
    UNCOMPRESSED(null, CompressionCodec.UNCOMPRESSED, ""),
    SNAPPY("parquet.hadoop.codec.SnappyCodec", CompressionCodec.SNAPPY, ".snappy"),
    GZIP("org.apache.hadoop.io.compress.GzipCodec", CompressionCodec.GZIP, ".gz"),
    LZO("com.hadoop.compression.lzo.LzoCodec", CompressionCodec.LZO, ".lzo");

    public static CompressionCodecName fromConf(String name) {
        if (name == null) {
            return UNCOMPRESSED;
        }
        return valueOf(name.toUpperCase());
    }

    public static CompressionCodecName fromCompressionCodec(Class<?> clazz) {
        if (clazz == null) {
            return UNCOMPRESSED;
        }
        String name = clazz.getName();
        for (CompressionCodecName codec : CompressionCodecName.values()) {
            if (name.equals(codec.getHadoopCompressionCodecClassName())) {
                return codec;
            }
        }
        throw new CompressionCodecNotSupportedException(clazz);
    }

    public static CompressionCodecName fromParquet(CompressionCodec codec) {
        for (CompressionCodecName codecName : CompressionCodecName.values()) {
            if (codec.equals(codecName.parquetCompressionCodec)) {
                return codecName;
            }
        }
        throw new IllegalArgumentException("Unknown compression codec " + codec);
    }

    private final String hadoopCompressionCodecClass;
    private final CompressionCodec parquetCompressionCodec;
    private final String extension;

    private CompressionCodecName(String hadoopCompressionCodecClass, CompressionCodec parquetCompressionCodec, String extension) {
        this.hadoopCompressionCodecClass = hadoopCompressionCodecClass;
        this.parquetCompressionCodec = parquetCompressionCodec;
        this.extension = extension;
    }

    public String getHadoopCompressionCodecClassName() {
        return hadoopCompressionCodecClass;
    }

    public Class getHadoopCompressionCodecClass() {
        String codecClassName = getHadoopCompressionCodecClassName();
        if (codecClassName == null) {
            return null;
        }
        try {
            return Class.forName(codecClassName);
        } catch (ClassNotFoundException e) {
            return null;
        }
    }

    public CompressionCodec getParquetCompressionCodec() {
        return parquetCompressionCodec;
    }

    public String getExtension() {
        return extension;
    }

}