| /* ==================================================================== |
| 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; |
| |
| /** |
| * @author Josh Micich |
| */ |
| public final class IntersectionEval extends Fixed2ArgFunction { |
| |
| public static final Function instance = new IntersectionEval(); |
| |
| private IntersectionEval() { |
| // enforces singleton |
| } |
| |
| 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 |
| * <tt>aeA</tt> and <tt>aeB</tt>. If the two areas do not intersect, the result is <code>null</code>. |
| */ |
| 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() + ")"); |
| } |
| } |