/* ====================================================================
   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 org.apache.poi.util.LittleEndianOutput;

/**
 * Common superclass of all value operators. Subclasses include all unary and
 * binary operators except for the reference operators (IntersectionPtg,
 * RangePtg, UnionPtg)
 */
public abstract class ValueOperatorPtg extends OperationPtg {

    protected ValueOperatorPtg() {}

    /**
     * All Operator {@code Ptg}s are base tokens (i.e. are not RVA classified)
     */
    @Override
    public final boolean isBaseToken() {
        return true;
    }

    @Override
    public final byte getDefaultOperandClass() {
        return Ptg.CLASS_VALUE;
    }

    @Override
    public void write(LittleEndianOutput out) {
        out.writeByte(getSid());
    }

    @Override
    public final int getSize() {
        return 1;
    }

    @Override
    public final String toFormulaString() {
        // TODO - prune this method out of the hierarchy
        throw new IllegalStateException("toFormulaString(String[] operands) should be used for subclasses of OperationPtgs");
    }
}
