80 lines
2.5 KiB
Java
80 lines
2.5 KiB
Java
/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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package org.apache.poi.hssf.record.formula.eval;
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/**
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*
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* @author Josh Micich
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*/
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public final class RangeEval implements OperationEval {
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public static final OperationEval instance = new RangeEval();
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private RangeEval() {
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// enforces singleton
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}
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public ValueEval evaluate(ValueEval[] args, int srcCellRow, short srcCellCol) {
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if(args.length != 2) {
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return ErrorEval.VALUE_INVALID;
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}
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try {
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AreaEval reA = evaluateRef(args[0]);
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AreaEval reB = evaluateRef(args[1]);
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return resolveRange(reA, reB);
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} catch (EvaluationException e) {
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return e.getErrorEval();
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}
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}
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/**
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* @return simple rectangular {@link AreaEval} which fully encloses both areas
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* <tt>aeA</tt> and <tt>aeB</tt>
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*/
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private static AreaEval resolveRange(AreaEval aeA, AreaEval aeB) {
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int aeAfr = aeA.getFirstRow();
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int aeAfc = aeA.getFirstColumn();
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int top = Math.min(aeAfr, aeB.getFirstRow());
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int bottom = Math.max(aeA.getLastRow(), aeB.getLastRow());
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int left = Math.min(aeAfc, aeB.getFirstColumn());
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int right = Math.max(aeA.getLastColumn(), aeB.getLastColumn());
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return aeA.offset(top-aeAfr, bottom-aeAfr, left-aeAfc, right-aeAfc);
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}
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private static AreaEval evaluateRef(Eval arg) throws EvaluationException {
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if (arg instanceof AreaEval) {
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return (AreaEval) arg;
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}
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if (arg instanceof RefEval) {
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return ((RefEval) arg).offset(0, 0, 0, 0);
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}
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if (arg instanceof ErrorEval) {
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throw new EvaluationException((ErrorEval)arg);
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}
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throw new IllegalArgumentException("Unexpected ref arg class (" + arg.getClass().getName() + ")");
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}
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public int getNumberOfOperands() {
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return 2;
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}
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}
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