org.apache.hadoop.hive.serde2.lazy.LazyHiveDecimal.java Source code

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Here is the source code for org.apache.hadoop.hive.serde2.lazy.LazyHiveDecimal.java

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/**
 * 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 org.apache.hadoop.hive.serde2.lazy;

import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.charset.CharacterCodingException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.common.type.HiveDecimal;
import org.apache.hadoop.hive.serde2.io.HiveDecimalWritable;
import org.apache.hadoop.hive.serde2.lazy.objectinspector.primitive.LazyHiveDecimalObjectInspector;
import org.apache.hadoop.hive.serde2.typeinfo.DecimalTypeInfo;
import org.apache.hadoop.io.Text;

public class LazyHiveDecimal extends LazyPrimitive<LazyHiveDecimalObjectInspector, HiveDecimalWritable> {
    static final private Log LOG = LogFactory.getLog(LazyHiveDecimal.class);

    private final int precision;
    private final int scale;
    private static final byte[] nullBytes = new byte[] { 0x0, 0x0, 0x0, 0x0 };

    public LazyHiveDecimal(LazyHiveDecimalObjectInspector oi) {
        super(oi);
        DecimalTypeInfo typeInfo = (DecimalTypeInfo) oi.getTypeInfo();
        if (typeInfo == null) {
            throw new RuntimeException("Decimal type used without type params");
        }

        precision = typeInfo.precision();
        scale = typeInfo.scale();
        data = new HiveDecimalWritable();
    }

    public LazyHiveDecimal(LazyHiveDecimal copy) {
        super(copy);
        precision = copy.precision;
        scale = copy.scale;
        data = new HiveDecimalWritable(copy.data);
    }

    /**
     * Initilizes LazyHiveDecimal object by interpreting the input bytes
     * as a numeric string
     *
     * @param bytes
     * @param start
     * @param length
     */
    @Override
    public void init(ByteArrayRef bytes, int start, int length) {
        String byteData = null;
        try {
            byteData = Text.decode(bytes.getData(), start, length);
        } catch (CharacterCodingException e) {
            isNull = true;
            LOG.debug("Data not in the HiveDecimal data type range so converted to null.", e);
            return;
        }

        HiveDecimal dec = HiveDecimal.create(byteData);
        dec = enforcePrecisionScale(dec);
        if (dec != null) {
            data.set(dec);
            isNull = false;
        } else {
            LOG.debug(
                    "Data not in the HiveDecimal data type range so converted to null. Given data is :" + byteData);
            isNull = true;
        }
    }

    private HiveDecimal enforcePrecisionScale(HiveDecimal dec) {
        return HiveDecimal.enforcePrecisionScale(dec, precision, scale);
    }

    @Override
    public HiveDecimalWritable getWritableObject() {
        return data;
    }

    /**
     * Writes HiveDecimal object to output stream as string
     * @param outputStream
     * @param hiveDecimal
     * @throws IOException
     */
    public static void writeUTF8(OutputStream outputStream, HiveDecimal hiveDecimal) throws IOException {
        if (hiveDecimal == null) {
            outputStream.write(nullBytes);
        } else {
            ByteBuffer b = Text.encode(hiveDecimal.toString());
            outputStream.write(b.array(), 0, b.limit());
        }
    }
}