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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.ss.formula.ptg;
import java.util.Map;
import java.util.function.Supplier;

import org.apache.poi.ss.formula.function.FunctionMetadata;
import org.apache.poi.ss.formula.function.FunctionMetadataRegistry;
import org.apache.poi.util.BitField;
import org.apache.poi.util.BitFieldFactory;
import org.apache.poi.util.GenericRecordUtil;
import org.apache.poi.util.LittleEndianInput;
import org.apache.poi.util.LittleEndianOutput;

public final class FuncVarPtg extends AbstractFunctionPtg {
    public final static byte sid  = 0x22;
    private final static int  SIZE = 4;

    // See spec at 2.5.198.63 PtgFuncVar
    private static final BitField ceFunc = BitFieldFactory.getInstance(0xF000);

    /**
     * Single instance of this token for 'sum() taking a single argument'
     */
    public static final OperationPtg SUM = FuncVarPtg.create("SUM", 1);

    private final boolean _isCetab;

    private FuncVarPtg(int functionIndex, int returnClass, byte[] paramClasses, int numArgs, boolean isCetab) {
        super(functionIndex, returnClass, paramClasses, numArgs);
        _isCetab = isCetab;
    }

    /**Creates new function pointer from a byte array
     * usually called while reading an excel file.
     */
    public static FuncVarPtg create(LittleEndianInput in)  {
        return create(in.readByte(), in.readUShort());
    }

    /**
     * Create a function ptg from a string tokenised by the parser
     */
    public static FuncVarPtg create(String pName, int numArgs) {
        return create(numArgs, lookupIndex(pName));
    }

    private static FuncVarPtg create(int numArgs, int functionIndex) {
        final FunctionMetadata fm;
        boolean isCetab = ceFunc.isSet(functionIndex);
        if(isCetab) {
            functionIndex = ceFunc.clear(functionIndex);
            fm = FunctionMetadataRegistry.getCetabFunctionByIndex(functionIndex);
        } else {
            fm = FunctionMetadataRegistry.getFunctionByIndex(functionIndex);
        }

        if (fm == null) {
            // Happens only as a result of a call to FormulaParser.parse(), with a non-built-in function name
            return new FuncVarPtg(functionIndex, Ptg.CLASS_VALUE, new byte[]{Ptg.CLASS_VALUE}, numArgs, isCetab);
        }
        return new FuncVarPtg(functionIndex, fm.getReturnClassCode(), fm.getParameterClassCodes(), numArgs, isCetab);
    }

    @Override
    protected String lookupName(short index) {
        return lookupName(index, _isCetab);
    }

    public void write(LittleEndianOutput out) {
        out.writeByte(sid + getPtgClass());
        out.writeByte(getNumberOfOperands());
        out.writeShort(getFunctionIndex());
    }

    @Override
    public byte getSid() {
        return sid;
    }

    public int getSize() {
        return SIZE;
    }

    @Override
    public FuncVarPtg copy() {
        // immutable
        return this;
    }

    @Override
    public Map> getGenericProperties() {
        return GenericRecordUtil.getGenericProperties(
            "base", super::getGenericProperties,
            "cetab", () -> _isCetab
        );
    }
}