97 lines
3.0 KiB
Java
97 lines
3.0 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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import org.apache.poi.hssf.record.formula.functions.Fixed2ArgFunction;
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import org.apache.poi.hssf.record.formula.functions.Function;
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/**
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* @author Josh Micich
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*/
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public final class IntersectionEval extends Fixed2ArgFunction {
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public static final Function instance = new IntersectionEval();
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private IntersectionEval() {
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// enforces singleton
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}
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public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1) {
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try {
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AreaEval reA = evaluateRef(arg0);
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AreaEval reB = evaluateRef(arg1);
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AreaEval result = resolveRange(reA, reB);
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if (result == null) {
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return ErrorEval.NULL_INTERSECTION;
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}
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return result;
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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 represents the intersection of areas
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* <tt>aeA</tt> and <tt>aeB</tt>. If the two areas do not intersect, the result is <code>null</code>.
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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 aeBlc = aeB.getLastColumn();
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if (aeAfc > aeBlc) {
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return null;
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}
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int aeBfc = aeB.getFirstColumn();
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if (aeBfc > aeA.getLastColumn()) {
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return null;
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}
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int aeBlr = aeB.getLastRow();
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if (aeAfr > aeBlr) {
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return null;
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}
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int aeBfr = aeB.getFirstRow();
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int aeAlr = aeA.getLastRow();
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if (aeBfr > aeAlr) {
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return null;
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}
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int top = Math.max(aeAfr, aeBfr);
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int bottom = Math.min(aeAlr, aeBlr);
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int left = Math.max(aeAfc, aeBfc);
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int right = Math.min(aeA.getLastColumn(), aeBlc);
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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(ValueEval 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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}
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