Add fflib_Formula.cls that can evaluate multiple instances of FormulaEval.FormulaInstance (#66)
This commit is contained in:
William Velzeboer
@@ -0,0 +1,411 @@
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/**
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* File Name: fflib_Formula
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* @description A evaluator for evaluating multiple instances of the {@link FormulaEval.FormulaInstance} class
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*
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* @author architect ir. Wilhelmus G.J. Velzeboer
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*
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* Copyright (c), W.G.J. Velzeboer,
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above author notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of the author nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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public with sharing class fflib_Formula
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{
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/**
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* The structure of the formulas
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*
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* @example '(1 OR 2) AND 3'
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*/
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private final String formulaStructure;
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private final Map<Integer, FormulaExpression> formulaByNumber;
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/**
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* Class constructor
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*
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* @param formulaStructure A String holding the formula structure e.g. '1 AND (2 OR 3)'
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* @param formulaByNumber A Map of the FormulaExpressions by their number
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*
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* @see fflib_Formula.FormulaExpression
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*/
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public fflib_Formula(String formulaStructure, Map<Integer, FormulaExpression> formulaByNumber)
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{
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this.formulaByNumber = formulaByNumber;
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this.formulaStructure = formulaStructure;
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}
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/**
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* Evaluates the formula structure and the given formula expressions to a boolean value
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*
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* @return Returns a boolean of the evaluated result
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*/
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public Boolean evaluate()
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{
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return parse(
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tokenizer(this.formulaStructure),
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formulaByNumber
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)
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.evaluate();
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}
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/**
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* Parse the next token into an Expression
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*
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* @param tokens A list of tokens from the tokenizer
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* @param formulaByNumber A map of FormulaExpressions by their number
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*
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* @return Returns an instance of {@link Expression}
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*
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* @see fflib_Formula.Expression
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*/
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@TestVisible
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private static Expression parse(List<Token> tokens, Map<Integer, FormulaExpression> formulaByNumber)
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{
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FormulaTokenType lookAhead = tokens.get(0).tokenType;
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switch on lookAhead
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{
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when PARENTHESIS_OPEN
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{
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return parseParenthesizedExpression(tokens, formulaByNumber);
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}
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when else
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{
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return parseLogicalOrExpression(tokens, formulaByNumber);
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}
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}
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}
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/**
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* Parse a parenthesized expression
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* '(' expression ')'
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*
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* @param tokens The list of tokens still to be processes
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* @param formulaByNumber A map of FormulaExpressions by their number
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*
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* @return Returns the expression within the parenthesis
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*/
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private static Expression parseParenthesizedExpression(
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List<Token> tokens,
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Map<Integer, FormulaExpression> formulaByNumber)
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{
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eat(tokens, FormulaTokenType.PARENTHESIS_OPEN);
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Expression expr = parse(tokens, formulaByNumber);
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eat(tokens, FormulaTokenType.PARENTHESIS_CLOSE);
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return expr;
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}
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/**
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* Parse a logical OR expression
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* expression
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* expression OR expression
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*
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* @param tokens The list of tokens still to be processes
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* @param formulaByNumber A map of FormulaExpressions by their number
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*
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* @return Returns an {@link fflib_Formula.OrExpression} or the expression itself
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*/
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private static Expression parseLogicalOrExpression(
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List<Token> tokens,
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Map<Integer, FormulaExpression> formulaByNumber)
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{
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Expression left = parseLogicalAndExpression(tokens, formulaByNumber);
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while (tokens.isEmpty() == false)
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{
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if (tokens.get(0).tokenType != FormulaTokenType.xOR) break;
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eat(tokens, FormulaTokenType.xOR);
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Expression right = parseLogicalAndExpression(tokens, formulaByNumber);
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left = new OrExpression(left, right);
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}
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return left;
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}
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/**
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* Parse a logic AND expression
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* expression
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* expression AND primary-expression
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*
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* @param tokens The list of tokens still to be processes
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* @param formulaByNumber A map of FormulaExpressions by their number
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*
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* @return Returns an {@link fflib_Formula.AndExpression} or the expression itself
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*/
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private static Expression parseLogicalAndExpression(
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List<fflib_Formula.Token> tokens,
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Map<Integer, FormulaExpression> formulaByNumber)
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{
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Expression left = parsePrimaryExpression(tokens, formulaByNumber);
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while (tokens.isEmpty() == false)
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{
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if (tokens.get(0).tokenType != FormulaTokenType.xAND) break;
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eat(tokens, FormulaTokenType.xAND);
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Expression right = parsePrimaryExpression(tokens, formulaByNumber);
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left = new AndExpression(left, right);
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}
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return left;
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}
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/**
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* Parse a primary expression
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* parenthesized-expression
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* number-expression
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*
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* @param tokens The list of tokens still to be processes
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* @param formulaByNumber A map of FormulaExpressions by their number
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*
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* @return Returns an {@link Expression} or a {@link FormulaExpression}
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*/
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private static Expression parsePrimaryExpression(
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List<fflib_Formula.Token> tokens,
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Map<Integer, FormulaExpression> formulaByNumber)
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{
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Expression result;
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if (tokens.isEmpty()) throw new FormulaEvaluationException('Unexpected end of formula, expected and expression');
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switch on tokens.get(0).tokenType
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{
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when PARENTHESIS_OPEN
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{
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result = parseParenthesizedExpression(tokens, formulaByNumber);
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}
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when FORMULA_NUMBER
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{
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result = parseNumberExpression(tokens, formulaByNumber);
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}
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}
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return result;
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}
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/**
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* Parse a number expression
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* `^\\d`
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*
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* @param tokens The list of tokens still to be processes
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* @param formulaByNumber A map of FormulaExpressions by their number
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*
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* @return Returns the corresponding {@link FormulaExpression} from the parsed number
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* which is used as key in the given formulaByNumber map
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*/
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private static Expression parseNumberExpression(
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List<fflib_Formula.Token> tokens,
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Map<Integer, FormulaExpression> formulaByNumber)
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{
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Token token = eat(tokens, FormulaTokenType.FORMULA_NUMBER);
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Integer i = Integer.valueOf(token.literal);
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if (formulaByNumber.containsKey(i) == false) throw new FormulaEvaluationException('Unknown number ' + i);
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return formulaByNumber.get(i);
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}
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/**
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* Takes first token from the list that must match the given token type
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*
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* @param tokens The list of tokens still to be processes
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* @param tokenType The token type of the first token in the list
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*
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* @return Returns the first token of the given tokens
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*
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* @throws FormulaEvaluationException when there are no tokens left
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* or when the first token is not of the requested type
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*/
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private static Token eat(List<Token> tokens, FormulaTokenType tokenType)
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{
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if (tokens.isEmpty()) throw new FormulaEvaluationException('Unexpected end of line, expected ' + tokenType.name());
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else if (tokens.get(0).tokenType !== tokenType) throw new FormulaEvaluationException('Unexpected token \'' + tokens.get(0).literal + '\', expected ' + tokenType.name());
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return tokens.remove(0);
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}
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/**
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* Tokenizes the given snippet into tokens that can be read by the parser
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*
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* @param snippet A formula structure e.g. "1 AND 2 OR 3"
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*
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* @return Returns the list of tokens
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*
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* @throws FormulaEvaluationException When encountering an unknown token
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*/
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private static List<Token> tokenizer(String snippet)
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{
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List<Token> result = new List<Token>();
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snippet = '(' + snippet + ')'; // Make sure we evaluate the whole snippet
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snippet = snippet.replaceAll('\\(', ' ( ');
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snippet = snippet.replaceAll('\\)', ' ) ');
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List<String> strings = snippet.split('(\\b|\\s)');
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for (String literal : strings)
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{
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if (String.isBlank(literal))
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{
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continue; // ignore spaces
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}
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else if (literal.trim() == '(')
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{
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result.add(new Token(literal, FormulaTokenType.PARENTHESIS_OPEN));
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}
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else if (literal.trim() == ')')
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{
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result.add(new Token(literal, FormulaTokenType.PARENTHESIS_CLOSE));
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}
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else if (literal.toUpperCase().trim() == 'OR' || literal.trim() == '||')
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{
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result.add(new Token(literal, FormulaTokenType.xOR));
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}
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else if (literal.toUpperCase().trim() == 'AND' || literal.trim() == '&&')
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{
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result.add(new Token(literal, FormulaTokenType.xAND));
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}
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else
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{
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try
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{
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Integer.valueOf(literal);
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}
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catch (Exception e)
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{
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throw new FormulaEvaluationException('Invalid token \'' + literal + '\'');
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}
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result.add(new Token(literal, FormulaTokenType.FORMULA_NUMBER));
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}
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}
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return result;
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}
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@TestVisible
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private interface Expression
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{
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/**
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* Evaluate the Expression
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*
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* @return Returns a boolean value of the evaluated expression
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*/
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Boolean evaluate();
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}
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/**
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* FormulaExpression Class
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*
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* Used to hold the {@link FormulaEval.FormulaInstance} and the object that should be evaluated
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*/
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public class FormulaExpression implements Expression
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{
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private final FormulaEval.FormulaInstance instance;
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private final Object objectToEvaluate;
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public FormulaExpression(FormulaEval.FormulaInstance instance, Object objectToEvaluate)
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{
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this.instance = instance;
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this.objectToEvaluate = objectToEvaluate;
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}
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public Boolean evaluate()
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{
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return (Boolean) this.instance.evaluate(this.objectToEvaluate);
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}
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}
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/**
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* AndExpression Class
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*
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* Used to hold AND expressions e.g. 'expression AND expression' and is able to evaluate the expressions.
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* NOTE: the right hand side will only be evaluated if the left hand side returned true
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*/
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@TestVisible
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private class AndExpression implements Expression
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{
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@TestVisible private final Expression left;
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@TestVisible private final Expression right;
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public AndExpression(Expression left, Expression right)
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{
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this.left = left;
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this.right = right;
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}
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public Boolean evaluate()
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{
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return left.evaluate() && right.evaluate();
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}
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}
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/**
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* OrExpression Class
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*
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* Used to hold OR expressions e.g. 'expression OR expression' and is able to evaluate the expressions.
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* NOTE: the right hand side will only be evaluated if the left hand side returned false
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*/
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@TestVisible
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private class OrExpression implements Expression
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{
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@TestVisible private final Expression left;
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@TestVisible private final Expression right;
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public OrExpression(Expression left, Expression right)
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{
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this.left = left;
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this.right = right;
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}
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public Boolean evaluate()
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{
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return left.evaluate() || right.evaluate();
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}
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}
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/**
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* Token Class
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*
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* Tokens are used by the Tokenizer to translate a formula structure into tokens the parser can understand
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*/
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@TestVisible
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private class Token
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{
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private final String literal;
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private final FormulaTokenType tokenType;
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public Token(String literal, FormulaTokenType tokenType)
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{
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this.literal = literal;
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this.tokenType = tokenType;
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}
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}
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/**
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* FormulaTokenType enum
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*
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* The available token types which can be used in a formula structure
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*/
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@TestVisible
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private enum FormulaTokenType
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{
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FORMULA_NUMBER, // e.g. '\\d'
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xAND, // e.g. 'And', '&&'
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xOR, // e.g. 'OR', '||'
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PARENTHESIS_OPEN, // e.g. '('
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PARENTHESIS_CLOSE // e.g. ')'
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}
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}
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@@ -0,0 +1,5 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<ApexClass xmlns="http://soap.sforce.com/2006/04/metadata">
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<apiVersion>64.0</apiVersion>
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<status>Active</status>
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</ApexClass>
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@@ -0,0 +1,258 @@
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/**
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* File Name: fflib_FormulaTest
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* @description A test class for {@link fflib_Formula} class
|
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*
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||||
* @author architect ir. Wilhelmus G.J. Velzeboer
|
||||
*
|
||||
* Copyright (c), W.G.J. Velzeboer,
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without modification,
|
||||
* are permitted provided that the following conditions are met:
|
||||
*
|
||||
* - Redistributions of source code must retain the above author notice,
|
||||
* this list of conditions and the following disclaimer.
|
||||
* - Redistributions in binary form must reproduce the above copyright notice,
|
||||
* this list of conditions and the following disclaimer in the documentation
|
||||
* and/or other materials provided with the distribution.
|
||||
* - Neither the name of the author nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software without
|
||||
* specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
||||
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
|
||||
* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
||||
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
|
||||
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*/
|
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@IsTest
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private class fflib_FormulaTest
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{
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@IsTest
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static void itShouldTestSingleFormula()
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{
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final String formulaStructure = '1';
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fflib_Formula.FormulaExpression expression = generateAccountSiteFormula();
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final Map<Integer, fflib_Formula.FormulaExpression> formulaByNumber =
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new Map<Integer, fflib_Formula.FormulaExpression>
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{
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1 => expression
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};
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System.Test.startTest();
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Boolean result = new fflib_Formula(formulaStructure, formulaByNumber).evaluate();
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System.Test.stopTest();
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System.Assert.isTrue(result, 'Incorrect result for evaluated formula');
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}
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@IsTest
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static void itShouldTestSingleFormula_parenthesized()
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{
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final String formulaStructure = '(1)';
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fflib_Formula.FormulaExpression expression = generateContactCountryFormula();
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final Map<Integer, fflib_Formula.FormulaExpression> formulaByNumber =
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new Map<Integer, fflib_Formula.FormulaExpression>
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{
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1 => expression
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};
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System.Test.startTest();
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Boolean result = new fflib_Formula(formulaStructure, formulaByNumber).evaluate();
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System.Test.stopTest();
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System.Assert.isTrue(result, 'Incorrect result for evaluated formula');
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}
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@IsTest
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static void itShouldTestSingleFormula_failing()
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{
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final String formulaStructure = 'unknown';
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fflib_Formula.FormulaExpression expression = generateAccountSiteFormula();
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final Map<Integer, fflib_Formula.FormulaExpression> formulaByNumber =
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new Map<Integer, fflib_Formula.FormulaExpression>
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{
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1 => expression
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};
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System.Test.startTest();
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try
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{
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new fflib_Formula(formulaStructure, formulaByNumber).evaluate();
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System.Assert.fail('Expected an exception, but got none');
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}
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catch (FormulaEvaluationException e)
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||||
{
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System.Assert.areEqual('Invalid token \'unknown\'', e.getMessage(), 'Incorrect error message');
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}
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System.Test.stopTest();
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}
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@IsTest
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static void itShouldTestAndFormula()
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{
|
||||
final String formulaStructure = '1 AND 2';
|
||||
fflib_Formula.FormulaExpression expr1 = generateAccountSiteFormula();
|
||||
fflib_Formula.FormulaExpression expr2 = generateContactCountryFormula();
|
||||
|
||||
final Map<Integer, fflib_Formula.FormulaExpression> formulaByNumber =
|
||||
new Map<Integer, fflib_Formula.FormulaExpression>
|
||||
{
|
||||
1 => expr1,
|
||||
2 => expr2
|
||||
};
|
||||
|
||||
System.Test.startTest();
|
||||
Boolean result = new fflib_Formula(formulaStructure, formulaByNumber).evaluate();
|
||||
System.Test.stopTest();
|
||||
|
||||
System.Assert.isTrue(result, 'Incorrect result for evaluated formula');
|
||||
}
|
||||
|
||||
@IsTest
|
||||
static void itShouldTestOrFormula()
|
||||
{
|
||||
final String formulaStructure = '1 || 2';
|
||||
fflib_Formula.FormulaExpression expr1 = generateLeadCountryFormula();
|
||||
fflib_Formula.FormulaExpression expr2 = generateContactCountryFormula();
|
||||
|
||||
final Map<Integer, fflib_Formula.FormulaExpression> formulaByNumber =
|
||||
new Map<Integer, fflib_Formula.FormulaExpression>
|
||||
{
|
||||
1 => expr1,
|
||||
2 => expr2
|
||||
};
|
||||
|
||||
System.Test.startTest();
|
||||
Boolean result = new fflib_Formula(formulaStructure, formulaByNumber).evaluate();
|
||||
System.Test.stopTest();
|
||||
|
||||
System.Assert.isTrue(result, 'Incorrect result for evaluated formula');
|
||||
}
|
||||
|
||||
@IsTest
|
||||
static void itShouldTestOrFormula_Text()
|
||||
{
|
||||
final String formulaStructure = '1 OR 2';
|
||||
fflib_Formula.FormulaExpression expr1 = generateLeadCountryFormula();
|
||||
fflib_Formula.FormulaExpression expr2 = generateContactCountryFormula();
|
||||
|
||||
final Map<Integer, fflib_Formula.FormulaExpression> formulaByNumber =
|
||||
new Map<Integer, fflib_Formula.FormulaExpression>
|
||||
{
|
||||
1 => expr1,
|
||||
2 => expr2
|
||||
};
|
||||
|
||||
System.Test.startTest();
|
||||
Boolean result = new fflib_Formula(formulaStructure, formulaByNumber).evaluate();
|
||||
System.Test.stopTest();
|
||||
|
||||
System.Assert.isTrue(result, 'Incorrect result for evaluated formula');
|
||||
}
|
||||
|
||||
/**
|
||||
* OR expression
|
||||
* left = AND Expression
|
||||
* left = 1
|
||||
* right = 2
|
||||
* right = 3
|
||||
*/
|
||||
@IsTest
|
||||
static void itShouldParseAndOrFormula()
|
||||
{
|
||||
List<fflib_Formula.Token> tokens = new List<fflib_Formula.Token>
|
||||
{
|
||||
new fflib_Formula.Token('1', fflib_Formula.FormulaTokenType.FORMULA_NUMBER),
|
||||
new fflib_Formula.Token('AND', fflib_Formula.FormulaTokenType.xAND),
|
||||
new fflib_Formula.Token('2', fflib_Formula.FormulaTokenType.FORMULA_NUMBER),
|
||||
new fflib_Formula.Token('OR', fflib_Formula.FormulaTokenType.xOR),
|
||||
new fflib_Formula.Token('3', fflib_Formula.FormulaTokenType.FORMULA_NUMBER)
|
||||
};
|
||||
Map<Integer, fflib_Formula.FormulaExpression> formulaByNumber = new Map<Integer, fflib_Formula.FormulaExpression>
|
||||
{
|
||||
1 => null,
|
||||
2 => null,
|
||||
3 => null
|
||||
};
|
||||
|
||||
System.Test.startTest();
|
||||
fflib_Formula.Expression result = fflib_Formula.parse(tokens, formulaByNumber);
|
||||
System.Test.stopTest();
|
||||
|
||||
System.Assert.isTrue(result instanceof fflib_Formula.OrExpression, 'Expected an OR expression');
|
||||
fflib_Formula.OrExpression orExpression = (fflib_Formula.OrExpression) result;
|
||||
System.Assert.isTrue(orExpression.left instanceof fflib_Formula.AndExpression, 'Expected an AND expression');
|
||||
System.Assert.isNull(orExpression.right, 'Expected null for right hand side in OR expression');
|
||||
|
||||
fflib_Formula.AndExpression andExpression = (fflib_Formula.AndExpression) orExpression.left;
|
||||
System.Assert.isNull(andExpression.left, 'Expected null for left hand side in AND expression');
|
||||
System.Assert.isNull(andExpression.right, 'Expected null for right hand side in AND expression');
|
||||
}
|
||||
|
||||
@IsTest
|
||||
static void itShouldTestAndOrFormula()
|
||||
{
|
||||
final String formulaStructure = '1 AND (2 OR 3)';
|
||||
fflib_Formula.FormulaExpression expr1 = generateAccountSiteFormula();
|
||||
fflib_Formula.FormulaExpression expr2 = generateContactCountryFormula();
|
||||
fflib_Formula.FormulaExpression expr3 = generateLeadCountryFormula();
|
||||
|
||||
final Map<Integer, fflib_Formula.FormulaExpression> formulaByNumber =
|
||||
new Map<Integer, fflib_Formula.FormulaExpression>
|
||||
{
|
||||
1 => expr1,
|
||||
2 => expr3,
|
||||
3 => expr2
|
||||
};
|
||||
|
||||
System.Test.startTest();
|
||||
Boolean result = new fflib_Formula(formulaStructure, formulaByNumber).evaluate();
|
||||
System.Test.stopTest();
|
||||
|
||||
System.Assert.isTrue(result, 'Incorrect result for evaluated formula');
|
||||
}
|
||||
|
||||
|
||||
private static fflib_Formula.FormulaExpression generateAccountSiteFormula()
|
||||
{
|
||||
return new fflib_Formula.FormulaExpression(
|
||||
Formula.builder()
|
||||
.withReturnType(FormulaEval.FormulaReturnType.Boolean)
|
||||
.withType(Account.SObjectType)
|
||||
.withFormula('ISBLANK(Site) = FALSE')
|
||||
.build(),
|
||||
new Account(Site = 'Test')
|
||||
);
|
||||
}
|
||||
|
||||
private static fflib_Formula.FormulaExpression generateContactCountryFormula()
|
||||
{
|
||||
return new fflib_Formula.FormulaExpression(
|
||||
Formula.builder()
|
||||
.withReturnType(FormulaEval.FormulaReturnType.Boolean)
|
||||
.withType(Contact.SObjectType)
|
||||
.withFormula('MailingCountry = "Belgium"')
|
||||
.build(),
|
||||
new Contact(MailingCountry = 'Belgium')
|
||||
);
|
||||
}
|
||||
|
||||
private static fflib_Formula.FormulaExpression generateLeadCountryFormula()
|
||||
{
|
||||
return new fflib_Formula.FormulaExpression(
|
||||
Formula.builder()
|
||||
.withReturnType(FormulaEval.FormulaReturnType.Boolean)
|
||||
.withType(Lead.SObjectType)
|
||||
.withFormula('Country = "Germany"')
|
||||
.build(),
|
||||
new Lead(Country = 'Holland')
|
||||
);
|
||||
}
|
||||
}
|
||||
+5
@@ -0,0 +1,5 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<ApexClass xmlns="http://soap.sforce.com/2006/04/metadata">
|
||||
<apiVersion>64.0</apiVersion>
|
||||
<status>Active</status>
|
||||
</ApexClass>
|
||||
Reference in New Issue
Block a user