169 lines
5.4 KiB
Java
169 lines
5.4 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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import org.apache.poi.ss.util.NumberComparer;
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/**
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* Base class for all comparison operator evaluators
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*
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* @author Amol S. Deshmukh < amolweb at ya hoo dot com >
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*/
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public abstract class RelationalOperationEval extends Fixed2ArgFunction {
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/**
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* Converts a standard compare result (-1, 0, 1) to <code>true</code> or <code>false</code>
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* according to subclass' comparison type.
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*/
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protected abstract boolean convertComparisonResult(int cmpResult);
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/**
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* This is a description of how the relational operators apply in MS Excel.
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* Use this as a guideline when testing/implementing the evaluate methods
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* for the relational operators Evals.
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*
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* <pre>
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* Bool.TRUE > any number.
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* Bool > any string. ALWAYS
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* Bool.TRUE > Bool.FALSE
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* Bool.FALSE == Blank
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*
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* Strings are never converted to numbers or booleans
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* String > any number. ALWAYS
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* Non-empty String > Blank
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* Empty String == Blank
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* String are sorted dictionary wise
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*
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* Blank > Negative numbers
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* Blank == 0
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* Blank < Positive numbers
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* </pre>
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*/
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public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1) {
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ValueEval vA;
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ValueEval vB;
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try {
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vA = OperandResolver.getSingleValue(arg0, srcRowIndex, srcColumnIndex);
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vB = OperandResolver.getSingleValue(arg1, srcRowIndex, srcColumnIndex);
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} catch (EvaluationException e) {
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return e.getErrorEval();
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}
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int cmpResult = doCompare(vA, vB);
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boolean result = convertComparisonResult(cmpResult);
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return BoolEval.valueOf(result);
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}
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private static int doCompare(ValueEval va, ValueEval vb) {
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// special cases when one operand is blank
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if (va == BlankEval.instance) {
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return compareBlank(vb);
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}
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if (vb == BlankEval.instance) {
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return -compareBlank(va);
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}
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if (va instanceof BoolEval) {
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if (vb instanceof BoolEval) {
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BoolEval bA = (BoolEval) va;
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BoolEval bB = (BoolEval) vb;
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if (bA.getBooleanValue() == bB.getBooleanValue()) {
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return 0;
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}
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return bA.getBooleanValue() ? 1 : -1;
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}
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return 1;
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}
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if (vb instanceof BoolEval) {
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return -1;
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}
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if (va instanceof StringEval) {
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if (vb instanceof StringEval) {
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StringEval sA = (StringEval) va;
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StringEval sB = (StringEval) vb;
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return sA.getStringValue().compareToIgnoreCase(sB.getStringValue());
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}
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return 1;
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}
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if (vb instanceof StringEval) {
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return -1;
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}
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if (va instanceof NumberEval) {
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if (vb instanceof NumberEval) {
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NumberEval nA = (NumberEval) va;
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NumberEval nB = (NumberEval) vb;
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return NumberComparer.compare(nA.getNumberValue(), nB.getNumberValue());
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}
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}
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throw new IllegalArgumentException("Bad operand types (" + va.getClass().getName() + "), ("
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+ vb.getClass().getName() + ")");
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}
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private static int compareBlank(ValueEval v) {
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if (v == BlankEval.instance) {
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return 0;
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}
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if (v instanceof BoolEval) {
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BoolEval boolEval = (BoolEval) v;
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return boolEval.getBooleanValue() ? -1 : 0;
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}
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if (v instanceof NumberEval) {
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NumberEval ne = (NumberEval) v;
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return NumberComparer.compare(0.0, ne.getNumberValue());
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}
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if (v instanceof StringEval) {
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StringEval se = (StringEval) v;
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return se.getStringValue().length() < 1 ? 0 : -1;
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}
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throw new IllegalArgumentException("bad value class (" + v.getClass().getName() + ")");
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}
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public static final Function EqualEval = new RelationalOperationEval() {
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protected boolean convertComparisonResult(int cmpResult) {
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return cmpResult == 0;
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}
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};
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public static final Function GreaterEqualEval = new RelationalOperationEval() {
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protected boolean convertComparisonResult(int cmpResult) {
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return cmpResult >= 0;
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}
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};
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public static final Function GreaterThanEval = new RelationalOperationEval() {
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protected boolean convertComparisonResult(int cmpResult) {
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return cmpResult > 0;
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}
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};
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public static final Function LessEqualEval = new RelationalOperationEval() {
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protected boolean convertComparisonResult(int cmpResult) {
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return cmpResult <= 0;
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}
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};
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public static final Function LessThanEval = new RelationalOperationEval() {
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protected boolean convertComparisonResult(int cmpResult) {
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return cmpResult < 0;
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}
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};
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public static final Function NotEqualEval = new RelationalOperationEval() {
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protected boolean convertComparisonResult(int cmpResult) {
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return cmpResult != 0;
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}
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};
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}
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