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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.eval;
-
- import org.apache.poi.ss.formula.functions.Fixed2ArgFunction;
- import org.apache.poi.ss.formula.functions.Function;
-
- public final class IntersectionEval extends Fixed2ArgFunction {
-
- public static final Function instance = new IntersectionEval();
-
- private IntersectionEval() {
- // enforces singleton
- }
-
- @Override
- public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1) {
-
- try {
- AreaEval reA = evaluateRef(arg0);
- AreaEval reB = evaluateRef(arg1);
- AreaEval result = resolveRange(reA, reB);
- if (result == null) {
- return ErrorEval.NULL_INTERSECTION;
- }
- return result;
- } catch (EvaluationException e) {
- return e.getErrorEval();
- }
- }
-
- /**
- * @return simple rectangular {@link AreaEval} which represents the intersection of areas
- * {@code aeA} and {@code aeB}. If the two areas do not intersect, the result is {@code null}.
- */
- private static AreaEval resolveRange(AreaEval aeA, AreaEval aeB) {
-
- int aeAfr = aeA.getFirstRow();
- int aeAfc = aeA.getFirstColumn();
- int aeBlc = aeB.getLastColumn();
- if (aeAfc > aeBlc) {
- return null;
- }
- int aeBfc = aeB.getFirstColumn();
- if (aeBfc > aeA.getLastColumn()) {
- return null;
- }
- int aeBlr = aeB.getLastRow();
- if (aeAfr > aeBlr) {
- return null;
- }
- int aeBfr = aeB.getFirstRow();
- int aeAlr = aeA.getLastRow();
- if (aeBfr > aeAlr) {
- return null;
- }
-
-
- int top = Math.max(aeAfr, aeBfr);
- int bottom = Math.min(aeAlr, aeBlr);
- int left = Math.max(aeAfc, aeBfc);
- int right = Math.min(aeA.getLastColumn(), aeBlc);
-
- return aeA.offset(top-aeAfr, bottom-aeAfr, left-aeAfc, right-aeAfc);
- }
-
- private static AreaEval evaluateRef(ValueEval arg) throws EvaluationException {
- if (arg instanceof AreaEval) {
- return (AreaEval) arg;
- }
- if (arg instanceof RefEval) {
- return ((RefEval) arg).offset(0, 0, 0, 0);
- }
- if (arg instanceof ErrorEval) {
- throw new EvaluationException((ErrorEval)arg);
- }
- throw new IllegalArgumentException("Unexpected ref arg class (" + arg.getClass().getName() + ")");
- }
- }
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