| 1 | //////////////////////////////////////////////////////////////////////////////// | |
| 2 | // checkstyle: Checks Java source code for adherence to a set of rules. | |
| 3 | // Copyright (C) 2001-2018 the original author or authors. | |
| 4 | // | |
| 5 | // This library is free software; you can redistribute it and/or | |
| 6 | // modify it under the terms of the GNU Lesser General Public | |
| 7 | // License as published by the Free Software Foundation; either | |
| 8 | // version 2.1 of the License, or (at your option) any later version. | |
| 9 | // | |
| 10 | // This library is distributed in the hope that it will be useful, | |
| 11 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | // Lesser General Public License for more details. | |
| 14 | // | |
| 15 | // You should have received a copy of the GNU Lesser General Public | |
| 16 | // License along with this library; if not, write to the Free Software | |
| 17 | // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | //////////////////////////////////////////////////////////////////////////////// | |
| 19 | ||
| 20 | package com.puppycrawl.tools.checkstyle.checks.coding; | |
| 21 | ||
| 22 | import com.puppycrawl.tools.checkstyle.StatelessCheck; | |
| 23 | import com.puppycrawl.tools.checkstyle.api.AbstractCheck; | |
| 24 | import com.puppycrawl.tools.checkstyle.api.DetailAST; | |
| 25 | import com.puppycrawl.tools.checkstyle.api.TokenTypes; | |
| 26 | ||
| 27 | /** | |
| 28 | * <p> | |
| 29 | * Checks that switch statement has "default" clause. | |
| 30 | * </p> | |
| 31 | * <p> | |
| 32 | * Rationale: It's usually a good idea to introduce a | |
| 33 | * default case in every switch statement. Even if | |
| 34 | * the developer is sure that all currently possible | |
| 35 | * cases are covered, this should be expressed in the | |
| 36 | * default branch, e.g. by using an assertion. This way | |
| 37 | * the code is protected against later changes, e.g. | |
| 38 | * introduction of new types in an enumeration type. | |
| 39 | * </p> | |
| 40 | * <p> | |
| 41 | * An example of how to configure the check is: | |
| 42 | * </p> | |
| 43 | * <pre> | |
| 44 | * <module name="MissingSwitchDefault"/> | |
| 45 | * </pre> | |
| 46 | * @author o_sukhodolsky | |
| 47 | */ | |
| 48 | @StatelessCheck | |
| 49 | public class MissingSwitchDefaultCheck extends AbstractCheck { | |
| 50 | ||
| 51 | /** | |
| 52 | * A key is pointing to the warning message text in "messages.properties" | |
| 53 | * file. | |
| 54 | */ | |
| 55 | public static final String MSG_KEY = "missing.switch.default"; | |
| 56 | ||
| 57 | @Override | |
| 58 | public int[] getDefaultTokens() { | |
| 59 |
1
1. getDefaultTokens : mutated return of Object value for com/puppycrawl/tools/checkstyle/checks/coding/MissingSwitchDefaultCheck::getDefaultTokens to ( if (x != null) null else throw new RuntimeException ) → KILLED |
return getRequiredTokens(); |
| 60 | } | |
| 61 | ||
| 62 | @Override | |
| 63 | public int[] getAcceptableTokens() { | |
| 64 |
1
1. getAcceptableTokens : mutated return of Object value for com/puppycrawl/tools/checkstyle/checks/coding/MissingSwitchDefaultCheck::getAcceptableTokens to ( if (x != null) null else throw new RuntimeException ) → KILLED |
return getRequiredTokens(); |
| 65 | } | |
| 66 | ||
| 67 | @Override | |
| 68 | public int[] getRequiredTokens() { | |
| 69 |
1
1. getRequiredTokens : mutated return of Object value for com/puppycrawl/tools/checkstyle/checks/coding/MissingSwitchDefaultCheck::getRequiredTokens to ( if (x != null) null else throw new RuntimeException ) → KILLED |
return new int[] {TokenTypes.LITERAL_SWITCH}; |
| 70 | } | |
| 71 | ||
| 72 | @Override | |
| 73 | public void visitToken(DetailAST ast) { | |
| 74 | final DetailAST firstCaseGroupAst = ast.findFirstToken(TokenTypes.CASE_GROUP); | |
| 75 | ||
| 76 |
1
1. visitToken : negated conditional → KILLED |
if (!containsDefaultSwitch(firstCaseGroupAst)) { |
| 77 |
1
1. visitToken : removed call to com/puppycrawl/tools/checkstyle/checks/coding/MissingSwitchDefaultCheck::log → KILLED |
log(ast.getLineNo(), MSG_KEY); |
| 78 | } | |
| 79 | } | |
| 80 | ||
| 81 | /** | |
| 82 | * Checks if the case group or its sibling contain the 'default' switch. | |
| 83 | * @param caseGroupAst first case group to check. | |
| 84 | * @return true if 'default' switch found. | |
| 85 | */ | |
| 86 | private static boolean containsDefaultSwitch(DetailAST caseGroupAst) { | |
| 87 | DetailAST nextAst = caseGroupAst; | |
| 88 | boolean found = false; | |
| 89 | ||
| 90 |
1
1. containsDefaultSwitch : negated conditional → KILLED |
while (nextAst != null) { |
| 91 |
1
1. containsDefaultSwitch : negated conditional → KILLED |
if (nextAst.findFirstToken(TokenTypes.LITERAL_DEFAULT) != null) { |
| 92 | found = true; | |
| 93 | break; | |
| 94 | } | |
| 95 | ||
| 96 | nextAst = nextAst.getNextSibling(); | |
| 97 | } | |
| 98 | ||
| 99 |
1
1. containsDefaultSwitch : replaced return of integer sized value with (x == 0 ? 1 : 0) → KILLED |
return found; |
| 100 | } | |
| 101 | ||
| 102 | } | |
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