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   this work for additional information regarding copyright ownership.
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   distributed under the License is distributed on an "AS IS" BASIS,
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   See the License for the specific language governing permissions and
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package org.apache.poi.ss.formula;

import org.apache.poi.util.Internal;

Enumeration of various formula types.
See Sections 3 and 4.8 of https://www.openoffice.org/sc/excelfileformat.pdf
/**
 * Enumeration of various formula types.
 * 
 * See Sections 3 and 4.8 of https://www.openoffice.org/sc/excelfileformat.pdf
 */
@Internal
public enum FormulaType {
    
Regular cell formula /** Regular cell formula */
    CELL(true),
    
    
A Shared Formula ("{=SUM(A1:E1*{1,2,3,4,5}}")
Similar to an array formula, but stored in a SHAREDFMLA instead of ARRAY record as a file size optimization.
See Section 4.8 of https://www.openoffice.org/sc/excelfileformat.pdf
/**
     * A Shared Formula ("{=SUM(A1:E1*{1,2,3,4,5}}")
     * 
     * Similar to an array formula, but stored in a SHAREDFMLA instead of ARRAY record as a file size optimization.
     * See Section 4.8 of https://www.openoffice.org/sc/excelfileformat.pdf
     */
    SHARED(true),
    
    
An Array formula ("{=SUM(A1:E1*{1,2,3,4,5}}")
https://support.office.com/en-us/article/Guidelines-and-examples-of-array-formulas-7D94A64E-3FF3-4686-9372-ECFD5CAA57C7
/**
     * An Array formula ("{=SUM(A1:E1*{1,2,3,4,5}}")
     * https://support.office.com/en-us/article/Guidelines-and-examples-of-array-formulas-7D94A64E-3FF3-4686-9372-ECFD5CAA57C7
     */
    ARRAY(false),
    
    
Conditional formatting /** Conditional formatting */
    CONDFORMAT(true),
    
    
Named range /** Named range */
    NAMEDRANGE(false),
    
    
This constant is currently very specific.  The exact differences from general data
validation formulas or conditional format formulas is not known yet
/**
     * This constant is currently very specific.  The exact differences from general data
     * validation formulas or conditional format formulas is not known yet
     */
    DATAVALIDATION_LIST(false);
    
    
formula is expected to return a single value vs. multiple values /** formula is expected to return a single value vs. multiple values */
    private final boolean isSingleValue ;
    
Since:
POI 3.15 beta 3./**
     * @since POI 3.15 beta 3.
     */
    private FormulaType(boolean singleValue) {
        this.isSingleValue = singleValue;
    }
    
    
Returns:
true if this formula type only returns single values, false if it can return multiple values (arrays, ranges, etc.)/**
     * @return true if this formula type only returns single values, false if it can return multiple values (arrays, ranges, etc.)
     */
    public boolean isSingleValue() {
        return isSingleValue;
    }
    
    
Used to transition from ints (possibly stored in the Excel file) to FormulaTypes.
Params:
code – 
Throws:
IllegalArgumentException – if code is out of range
Returns:
FormulaType
Since:
POI 3.15 beta 3./**
     * Used to transition from <code>int</code>s (possibly stored in the Excel file) to <code>FormulaType</code>s.
     * @param code 
     * @return FormulaType
     * @throws IllegalArgumentException if code is out of range
     * @since POI 3.15 beta 3.
     */
    public static FormulaType forInt(int code) {
        if (code >= 0 && code < values().length) {
            return values()[code];
        }
        throw new IllegalArgumentException("Invalid FormulaType code: " + code);
    }
}