isblank.java

来自「EXCEL read and write」· Java 代码 · 共 49 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.
*/

package org.apache.poi.hssf.record.formula.functions;

import org.apache.poi.hssf.record.formula.eval.BlankEval;
import org.apache.poi.hssf.record.formula.eval.BoolEval;
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.EvaluationException;
import org.apache.poi.hssf.record.formula.eval.OperandResolver;
import org.apache.poi.hssf.record.formula.eval.ValueEval;

/**
 * @author Amol S. Deshmukh < amolweb at ya hoo dot com >
 *
 */
public final class Isblank implements Function {

	public Eval evaluate(Eval[] args, int srcCellRow, short srcCellCol) {
		if(args.length != 1) {
			return ErrorEval.VALUE_INVALID;
		}
		Eval arg = args[0];
		
		ValueEval singleCellValue;
		try {
			singleCellValue = OperandResolver.getSingleValue(arg, srcCellRow, srcCellCol);
		} catch (EvaluationException e) {
			return BoolEval.FALSE;
		}
		return BoolEval.valueOf(singleCellValue instanceof BlankEval);
	}
}