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

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Here is the source code for org.apache.hadoop.hive.ql.udf.UDFOPEqual.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 java.sql.Date;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * The reason that we list evaluate methods with all numeric types is for 
 * better performance; otherwise a single method that takes (Number a, Number b)
 * and use a.doubleValue() == b.doubleValue() is enough.
 */
public class UDFOPEqual extends UDFBaseCompare {

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

    public UDFOPEqual() {
    }

    public Boolean evaluate(String a, String b) {

        Boolean r = null;
        if ((a == null) || (b == null)) {
            r = null;
        } else {
            r = Boolean.valueOf(a.equals(b));
        }
        // LOG.info("evaluate(" + a + "," + b + ")=" + r);
        return r;
    }

    public Boolean evaluate(Byte a, Byte b) {
        Boolean r = null;
        if ((a == null) || (b == null)) {
            r = null;
        } else {
            r = Boolean.valueOf(a.byteValue() == b.byteValue());
        }
        // LOG.info("evaluate(" + a + "," + b + ")=" + r);
        return r;
    }

    public Boolean evaluate(Integer a, Integer b) {
        Boolean r = null;
        if ((a == null) || (b == null)) {
            r = null;
        } else {
            r = Boolean.valueOf(a.intValue() == b.intValue());
        }
        // LOG.info("evaluate(" + a + "," + b + ")=" + r);
        return r;
    }

    public Boolean evaluate(Long a, Long b) {
        Boolean r = null;
        if ((a == null) || (b == null)) {
            r = null;
        } else {
            r = Boolean.valueOf(a.longValue() == b.longValue());
        }
        // LOG.info("evaluate(" + a + "," + b + ")=" + r);
        return r;
    }

    public Boolean evaluate(Float a, Float b) {
        Boolean r = null;
        if ((a == null) || (b == null)) {
            r = null;
        } else {
            r = Boolean.valueOf(a.floatValue() == b.floatValue());
        }
        // LOG.info("evaluate(" + a + "," + b + ")=" + r);
        return r;
    }

    public Boolean evaluate(Double a, Double b) {
        Boolean r = null;
        if ((a == null) || (b == null)) {
            r = null;
        } else {
            r = Boolean.valueOf(a.doubleValue() == b.doubleValue());
        }
        // LOG.info("evaluate(" + a + "," + b + ")=" + r);
        return r;
    }

    public Boolean evaluate(Date a, Date b) {
        Boolean r = null;
        if ((a == null) || (b == null)) {
            r = null;
        } else {
            r = Boolean.valueOf(a.equals(b));
        }
        // LOG.info("evaluate(" + a + "," + b + ")=" + r);
        return r;
    }

}