001/////////////////////////////////////////////////////////////////////////////////////////////// 002// checkstyle: Checks Java source code and other text files for adherence to a set of rules. 003// Copyright (C) 2001-2023 the original author or authors. 004// 005// This library is free software; you can redistribute it and/or 006// modify it under the terms of the GNU Lesser General Public 007// License as published by the Free Software Foundation; either 008// version 2.1 of the License, or (at your option) any later version. 009// 010// This library is distributed in the hope that it will be useful, 011// but WITHOUT ANY WARRANTY; without even the implied warranty of 012// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 013// Lesser General Public License for more details. 014// 015// You should have received a copy of the GNU Lesser General Public 016// License along with this library; if not, write to the Free Software 017// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 018/////////////////////////////////////////////////////////////////////////////////////////////// 019 020package com.puppycrawl.tools.checkstyle.checks.indentation; 021 022import java.lang.reflect.Constructor; 023import java.util.HashMap; 024import java.util.Map; 025import java.util.Set; 026 027import com.puppycrawl.tools.checkstyle.api.DetailAST; 028import com.puppycrawl.tools.checkstyle.api.TokenTypes; 029import com.puppycrawl.tools.checkstyle.utils.CommonUtil; 030 031/** 032 * Factory for handlers. Looks up constructor via reflection. 033 * 034 */ 035public class HandlerFactory { 036 037 /** 038 * Registered handlers. 039 */ 040 private final Map<Integer, Constructor<?>> typeHandlers = new HashMap<>(); 041 042 /** Cache for created method call handlers. */ 043 private final Map<DetailAST, AbstractExpressionHandler> createdHandlers = new HashMap<>(); 044 045 /** 046 * Creates a HandlerFactory. 047 * 048 * @noinspection OverlyCoupledMethod 049 * @noinspectionreason OverlyCoupledMethod - complex nature of indentation check 050 * requires this coupling 051 */ 052 public HandlerFactory() { 053 register(TokenTypes.CASE_GROUP, CaseHandler.class); 054 register(TokenTypes.LITERAL_SWITCH, SwitchHandler.class); 055 register(TokenTypes.SLIST, SlistHandler.class); 056 register(TokenTypes.PACKAGE_DEF, PackageDefHandler.class); 057 register(TokenTypes.LITERAL_ELSE, ElseHandler.class); 058 register(TokenTypes.LITERAL_IF, IfHandler.class); 059 register(TokenTypes.LITERAL_TRY, TryHandler.class); 060 register(TokenTypes.LITERAL_CATCH, CatchHandler.class); 061 register(TokenTypes.LITERAL_FINALLY, FinallyHandler.class); 062 register(TokenTypes.LITERAL_DO, DoWhileHandler.class); 063 register(TokenTypes.LITERAL_WHILE, WhileHandler.class); 064 register(TokenTypes.LITERAL_FOR, ForHandler.class); 065 register(TokenTypes.METHOD_DEF, MethodDefHandler.class); 066 register(TokenTypes.CTOR_DEF, MethodDefHandler.class); 067 register(TokenTypes.CLASS_DEF, ClassDefHandler.class); 068 register(TokenTypes.ENUM_DEF, ClassDefHandler.class); 069 register(TokenTypes.OBJBLOCK, ObjectBlockHandler.class); 070 register(TokenTypes.INTERFACE_DEF, ClassDefHandler.class); 071 register(TokenTypes.IMPORT, ImportHandler.class); 072 register(TokenTypes.ARRAY_INIT, ArrayInitHandler.class); 073 register(TokenTypes.ANNOTATION_ARRAY_INIT, AnnotationArrayInitHandler.class); 074 register(TokenTypes.METHOD_CALL, MethodCallHandler.class); 075 register(TokenTypes.CTOR_CALL, MethodCallHandler.class); 076 register(TokenTypes.SUPER_CTOR_CALL, MethodCallHandler.class); 077 register(TokenTypes.LABELED_STAT, LabelHandler.class); 078 register(TokenTypes.STATIC_INIT, StaticInitHandler.class); 079 register(TokenTypes.INSTANCE_INIT, SlistHandler.class); 080 register(TokenTypes.VARIABLE_DEF, MemberDefHandler.class); 081 register(TokenTypes.LITERAL_NEW, NewHandler.class); 082 register(TokenTypes.INDEX_OP, IndexHandler.class); 083 register(TokenTypes.LITERAL_SYNCHRONIZED, SynchronizedHandler.class); 084 register(TokenTypes.LAMBDA, LambdaHandler.class); 085 register(TokenTypes.ANNOTATION_DEF, ClassDefHandler.class); 086 register(TokenTypes.ANNOTATION_FIELD_DEF, MethodDefHandler.class); 087 register(TokenTypes.SWITCH_RULE, SwitchRuleHandler.class); 088 register(TokenTypes.LITERAL_YIELD, YieldHandler.class); 089 register(TokenTypes.RECORD_DEF, ClassDefHandler.class); 090 register(TokenTypes.COMPACT_CTOR_DEF, MethodDefHandler.class); 091 } 092 093 /** 094 * Registers a handler. 095 * 096 * @param <T> type of the handler class object. 097 * @param type 098 * type from TokenTypes 099 * @param handlerClass 100 * the handler to register 101 */ 102 private <T> void register(int type, Class<T> handlerClass) { 103 final Constructor<T> ctor = CommonUtil.getConstructor(handlerClass, 104 IndentationCheck.class, 105 // current AST 106 DetailAST.class, 107 // parent 108 AbstractExpressionHandler.class 109 ); 110 typeHandlers.put(type, ctor); 111 } 112 113 /** 114 * Returns true if this type (form TokenTypes) is handled. 115 * 116 * @param type type from TokenTypes 117 * @return true if handler is registered, false otherwise 118 */ 119 public boolean isHandledType(int type) { 120 final Set<Integer> typeSet = typeHandlers.keySet(); 121 return typeSet.contains(type); 122 } 123 124 /** 125 * Gets list of registered handler types. 126 * 127 * @return int[] of TokenType types 128 */ 129 public int[] getHandledTypes() { 130 final Set<Integer> typeSet = typeHandlers.keySet(); 131 final int[] types = new int[typeSet.size()]; 132 int index = 0; 133 for (final Integer val : typeSet) { 134 types[index] = val; 135 index++; 136 } 137 138 return types; 139 } 140 141 /** 142 * Get the handler for an AST. 143 * 144 * @param indentCheck the indentation check 145 * @param ast ast to handle 146 * @param parent the handler parent of this AST 147 * 148 * @return the ExpressionHandler for ast 149 */ 150 public AbstractExpressionHandler getHandler(IndentationCheck indentCheck, 151 DetailAST ast, AbstractExpressionHandler parent) { 152 final AbstractExpressionHandler resultHandler; 153 final AbstractExpressionHandler handler = 154 createdHandlers.get(ast); 155 if (handler != null) { 156 resultHandler = handler; 157 } 158 else if (ast.getType() == TokenTypes.METHOD_CALL) { 159 resultHandler = createMethodCallHandler(indentCheck, ast, parent); 160 } 161 else { 162 final Constructor<?> handlerCtor = typeHandlers.get(ast.getType()); 163 resultHandler = (AbstractExpressionHandler) CommonUtil.invokeConstructor( 164 handlerCtor, indentCheck, ast, parent); 165 } 166 return resultHandler; 167 } 168 169 /** 170 * Create new instance of handler for METHOD_CALL. 171 * 172 * @param indentCheck the indentation check 173 * @param ast ast to handle 174 * @param parent the handler parent of this AST 175 * 176 * @return new instance. 177 */ 178 private AbstractExpressionHandler createMethodCallHandler(IndentationCheck indentCheck, 179 DetailAST ast, AbstractExpressionHandler parent) { 180 DetailAST astNode = ast.getFirstChild(); 181 while (astNode.getType() == TokenTypes.DOT) { 182 astNode = astNode.getFirstChild(); 183 } 184 AbstractExpressionHandler theParent = parent; 185 if (isHandledType(astNode.getType())) { 186 theParent = getHandler(indentCheck, astNode, theParent); 187 createdHandlers.put(astNode, theParent); 188 } 189 return new MethodCallHandler(indentCheck, ast, theParent); 190 } 191 192 /** Clears cache of created handlers. */ 193 public void clearCreatedHandlers() { 194 createdHandlers.clear(); 195 } 196 197}