org.apache.hadoop.hive.ql.udf.UDFToDouble.java Source code

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Here is the source code for org.apache.hadoop.hive.ql.udf.UDFToDouble.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.ql.udf;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.ql.exec.UDF;

public class UDFToDouble extends UDF {

    private static Log LOG = LogFactory.getLog(UDFToDouble.class.getName());

    public UDFToDouble() {
    }

    public Double evaluate(Byte i) {
        if (i == null) {
            return null;
        } else {
            return Double.valueOf(i.doubleValue());
        }
    }

    public Double evaluate(Integer i) {
        if (i == null) {
            return null;
        } else {
            return Double.valueOf(i.doubleValue());
        }
    }

    public Double evaluate(Long i) {
        if (i == null) {
            return null;
        } else {
            return Double.valueOf(i.doubleValue());
        }
    }

    public Double evaluate(Float i) {
        if (i == null) {
            return null;
        } else {
            return Double.valueOf(i.doubleValue());
        }
    }

    public Double evaluate(String i) {
        if (i == null) {
            return null;
        } else {
            try {
                return Double.valueOf(i);
            } catch (NumberFormatException e) {
                // MySQL returns 0 if the string is not a well-formed double value.
                // return Double.valueOf(0);
                // But we decided to return NULL instead, which is more conservative.
                return null;
            }
        }
    }

}