net.mooncloud.hadoop.hive.ql.udf.UDFUnbase64.java Source code

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Here is the source code for net.mooncloud.hadoop.hive.ql.udf.UDFUnbase64.java

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package net.mooncloud.hadoop.hive.ql.udf;

/**
 * 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.
 */

import org.apache.commons.codec.binary.Base64;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.hive.ql.exec.UDFArgumentLengthException;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.Text;

@Description(name = "mc_unbase64", value = "_FUNC_(str[, alphabet]) - Convert the argument from a base 64 string to binary")
public class UDFUnbase64 extends UDF {
    private final transient BytesWritable result = new BytesWritable();

    public BytesWritable evaluate(Text value) {
        if (value == null) {
            return null;
        }
        byte[] bytes = new byte[value.getLength()];
        System.arraycopy(value.getBytes(), 0, bytes, 0, value.getLength());
        byte[] decoded = Base64.decodeBase64(bytes);
        result.set(decoded, 0, decoded.length);
        return result;
    }

    public BytesWritable evaluate(Text value, Text alphabet) throws Exception {
        if (value == null || alphabet == null) {
            return null;
        }

        char[] CA = alphabet.toString().toCharArray();
        if (CA.length != 64) {
            throw new UDFArgumentLengthException("The length of alphabet must be 64.");
        }

        net.mooncloud.hadoop.hive.ql.util.Base64.alphabet(CA);

        // byte[] bytes = new byte[value.getLength()];
        // System.arraycopy(value.getBytes(), 0, bytes, 0, value.getLength());
        // byte[] decoded =
        // net.mooncloud.hadoop.hive.ql.util.Base64.decode(bytes);
        byte[] decoded = net.mooncloud.hadoop.hive.ql.util.Base64.decode(value.toString());
        result.set(decoded, 0, decoded.length);
        return result;
    }
}