org.apache.tajo.engine.function.string.InitCap.java Source code

Introduction

Here is the source code for org.apache.tajo.engine.function.string.InitCap.java

Source

/**
 * 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.tajo.engine.function.string;

import org.apache.commons.lang.WordUtils;
import org.apache.tajo.catalog.Column;
import org.apache.tajo.common.TajoDataTypes;
import org.apache.tajo.datum.Datum;
import org.apache.tajo.datum.DatumFactory;
import org.apache.tajo.datum.NullDatum;
import org.apache.tajo.plan.function.GeneralFunction;
import org.apache.tajo.engine.function.annotation.Description;
import org.apache.tajo.engine.function.annotation.ParamTypes;
import org.apache.tajo.storage.Tuple;

/**
 * Function definition
 *
 * text initcap(string text)
 */
@Description(functionName = "initcap", description = "Convert the first letter of each word to upper case "
        + " and the rest to lower case..", example = "> SELECT initcap('hi THOMAS');\n"
                + "Hi Thomas", returnType = TajoDataTypes.Type.TEXT, paramTypes = {
                        @ParamTypes(paramTypes = { TajoDataTypes.Type.TEXT }) })
public class InitCap extends GeneralFunction {
    public InitCap() {
        super(new Column[] { new Column("string", TajoDataTypes.Type.TEXT) });
    }

    @Override
    public Datum eval(Tuple params) {
        if (params.isBlankOrNull(0)) {
            return NullDatum.get();
        }

        return DatumFactory.createText(WordUtils.capitalizeFully(params.getText(0)));
    }
}