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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.functions;
-
- import org.apache.poi.ss.formula.eval.*;
-
- /**
- * Implementation of the various ISxxx Logical Functions, which
- * take a single expression argument, and return True or False.
- */
- public abstract class LogicalFunction extends Fixed1ArgFunction {
-
- @SuppressWarnings("unused")
- public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0) {
- ValueEval ve;
- try {
- ve = OperandResolver.getSingleValue(arg0, srcRowIndex, srcColumnIndex);
- } catch (EvaluationException e) {
- // Note - it is more usual to propagate error codes straight to the result like this:
- // but logical functions behave a little differently
- // return e.getErrorEval();
-
- // this will usually cause a 'FALSE' result except for ISNONTEXT()
- ve = e.getErrorEval();
- }
- return BoolEval.valueOf(evaluate(ve));
-
- }
- /**
- * @param arg any {@link ValueEval}, potentially {@link BlankEval} or {@link ErrorEval}.
- */
- protected abstract boolean evaluate(ValueEval arg);
-
- public static final Function ISLOGICAL = new LogicalFunction() {
- protected boolean evaluate(ValueEval arg) {
- return arg instanceof BoolEval;
- }
- };
- public static final Function ISNONTEXT = new LogicalFunction() {
- protected boolean evaluate(ValueEval arg) {
- return !(arg instanceof StringEval);
- }
- };
- public static final Function ISNUMBER = new LogicalFunction() {
- protected boolean evaluate(ValueEval arg) {
- return arg instanceof NumberEval;
- }
- };
- public static final Function ISTEXT = new LogicalFunction() {
- protected boolean evaluate(ValueEval arg) {
- return arg instanceof StringEval;
- }
- };
-
- public static final Function ISBLANK = new LogicalFunction() {
-
- protected boolean evaluate(ValueEval arg) {
- return arg instanceof BlankEval;
- }
- };
-
- public static final Function ISERROR = new LogicalFunction() {
-
- protected boolean evaluate(ValueEval arg) {
- return arg instanceof ErrorEval;
- }
- };
-
- /**
- * Implementation of Excel <tt>ISERR()</tt> function.<p/>
- *
- * <b>Syntax</b>:<br/>
- * <b>ISERR</b>(<b>value</b>)<p/>
- *
- * <b>value</b> The value to be tested<p/>
- *
- * Returns the logical value <tt>TRUE</tt> if value refers to any error value except
- * <tt>'#N/A'</tt>; otherwise, it returns <tt>FALSE</tt>.
- */
- public static final Function ISERR = new LogicalFunction() {
- @Override
- protected boolean evaluate(ValueEval arg) {
- if (arg instanceof ErrorEval) {
- return arg != ErrorEval.NA;
- }
- return false;
- }
- };
-
- /**
- * Implementation for Excel ISNA() function.<p/>
- *
- * <b>Syntax</b>:<br/>
- * <b>ISNA</b>(<b>value</b>)<p/>
- *
- * <b>value</b> The value to be tested<br/>
- * <br/>
- * Returns <tt>TRUE</tt> if the specified value is '#N/A', <tt>FALSE</tt> otherwise.
- */
- public static final Function ISNA = new LogicalFunction() {
-
- protected boolean evaluate(ValueEval arg) {
- return arg == ErrorEval.NA;
- }
- };
-
- public static final Function ISREF = new Fixed1ArgFunction() {
-
- public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0) {
- if (arg0 instanceof RefEval || arg0 instanceof AreaEval || arg0 instanceof RefListEval) {
- return BoolEval.TRUE;
- }
- return BoolEval.FALSE;
- }
- };
- }
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