t.java

来自「EXCEL read and write」· Java 代码 · 共 56 行

/*
* 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.
*/
/*
 * Created on May 15, 2005
 *
 */
package org.apache.poi.hssf.record.formula.functions;

import org.apache.poi.hssf.record.formula.eval.ErrorEval;
import org.apache.poi.hssf.record.formula.eval.Eval;
import org.apache.poi.hssf.record.formula.eval.RefEval;
import org.apache.poi.hssf.record.formula.eval.StringEval;

public final class T implements Function {

    public Eval evaluate(Eval[] args, int srcCellRow, short srcCellCol) {
        switch (args.length) {
            default:
                return ErrorEval.VALUE_INVALID;
            case 1:
                 break;
        }
        Eval arg = args[0];
        if (arg instanceof RefEval) {
            RefEval re = (RefEval) arg;
            arg = re.getInnerValueEval();
        }
        
        if (arg instanceof StringEval) {
            // Text values are returned unmodified
            return arg;
        }
        
        if (arg instanceof ErrorEval) {
            // Error values also returned unmodified
            return arg;
        }
        // for all other argument types the result is empty string
        return StringEval.EMPTY_INSTANCE;
    }
}