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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.
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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.poi.hssf.usermodel;

import org.apache.poi.ss.usermodel.DataValidation;
import org.apache.poi.ss.usermodel.DataValidationConstraint;
import org.apache.poi.ss.usermodel.DataValidationHelper;
import org.apache.poi.ss.usermodel.DataValidationConstraint.ValidationType;
import org.apache.poi.ss.util.CellRangeAddressList;

/**
 * Helper for working with Data Validation
 */
public class HSSFDataValidationHelper implements DataValidationHelper {
    // Findbugs: URF_UNREAD_FIELD . Do not delete without understanding how this class works.
    //private HSSFSheet sheet;
    
    public HSSFDataValidationHelper(HSSFSheet sheet) {
        super();
        // Findbugs: URF_UNREAD_FIELD . Do not delete without understanding how this class works.
        //this.sheet = sheet;
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.apache.poi.ss.usermodel.DataValidationHelper#createDateConstraint
     * (int, java.lang.String, java.lang.String, java.lang.String)
     */
    public DataValidationConstraint createDateConstraint(int operatorType, String formula1, String formula2, String dateFormat) {
        return DVConstraint.createDateConstraint(operatorType, formula1, formula2, dateFormat);
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.apache.poi.ss.usermodel.DataValidationHelper#createExplicitListConstraint
     * (java.lang.String[])
     */
    public DataValidationConstraint createExplicitListConstraint(String[] listOfValues) {
        return DVConstraint.createExplicitListConstraint(listOfValues);
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.apache.poi.ss.usermodel.DataValidationHelper#createFormulaListConstraint
     * (java.lang.String)
     */
    public DataValidationConstraint createFormulaListConstraint(String listFormula) {
        return DVConstraint.createFormulaListConstraint(listFormula);
    }

    
    
    public DataValidationConstraint createNumericConstraint(int validationType,int operatorType, String formula1, String formula2) {
        return DVConstraint.createNumericConstraint(validationType, operatorType, formula1, formula2);
    }

    public DataValidationConstraint createIntegerConstraint(int operatorType, String formula1, String formula2) {
        return DVConstraint.createNumericConstraint(ValidationType.INTEGER, operatorType, formula1, formula2);
    }
    
    /*
     * (non-Javadoc)
     * 
     * @see
     * org.apache.poi.ss.usermodel.DataValidationHelper#createNumericConstraint
     * (int, java.lang.String, java.lang.String)
     */
    public DataValidationConstraint createDecimalConstraint(int operatorType, String formula1, String formula2) {
        return DVConstraint.createNumericConstraint(ValidationType.DECIMAL, operatorType, formula1, formula2);
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.apache.poi.ss.usermodel.DataValidationHelper#createTextLengthConstraint
     * (int, java.lang.String, java.lang.String)
     */
    public DataValidationConstraint createTextLengthConstraint(int operatorType, String formula1, String formula2) {
        return DVConstraint.createNumericConstraint(ValidationType.TEXT_LENGTH, operatorType, formula1, formula2);
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.apache.poi.ss.usermodel.DataValidationHelper#createTimeConstraint
     * (int, java.lang.String, java.lang.String, java.lang.String)
     */
    public DataValidationConstraint createTimeConstraint(int operatorType, String formula1, String formula2) {
        return DVConstraint.createTimeConstraint(operatorType, formula1, formula2);
    }

    
    
    public DataValidationConstraint createCustomConstraint(String formula) {
        return DVConstraint.createCustomFormulaConstraint(formula);
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.apache.poi.ss.usermodel.DataValidationHelper#createValidation(org
     * .apache.poi.ss.usermodel.DataValidationConstraint,
     * org.apache.poi.ss.util.CellRangeAddressList)
     */
    public DataValidation createValidation(DataValidationConstraint constraint, CellRangeAddressList cellRangeAddressList) {
        return new HSSFDataValidation(cellRangeAddressList, constraint); 
    }
}