utils/checkstyle/checkstyle.xml

   1 <?xml version="1.0" encoding="UTF-8"?>
   2 <!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.3//EN" "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">
   3 <!--
   4         Jalview Checkstyle configuration file
   5 -->
   6 <module name="Checker">
   7         <!-- Default severity is warning -->
   8         <property name="severity" value="warning"/>
   9         <property name="fileExtensions" value="java,properties"/>
  10
  11         <!--
  12                 Add any metrics that you wish to suppress to the following file.
  13         -->
  14         <module name="SuppressionFilter">
  15                 <property name="file" value="${basedir}/utils/checkstyle/checkstyle-suppress.xml"/>
  16         </module>
  17
  18         <!--
  19                 Allow suppression of rules by comments, e.g.:
  20                 // CHECKSTYLE.OFF: ParameterNumber
  21                 ..method declaration
  22                 // CHECKSTYLE.ON: ParameterNumber
  23         -->
  24         <module name="SuppressionCommentFilter">
  25                 <property name="offCommentFormat" value="CHECKSTYLE.OFF\: ([\w\|]+)"/>
  26                 <property name="onCommentFormat" value="CHECKSTYLE.ON\: ([\w\|]+)"/>
  27                 <property name="checkFormat" value="$1"/>
  28         </module>
  29
  30         <!--
  31                 Check language bundles have the same keys and no duplicates
  32                 (ensure Checkstyle is configured to scan non-source files)
  33          -->
  34         <module name="Translation">
  35                 <property name="fileExtensions" value="properties"/>
  36                 <property name="baseName" value="^Messages.*$"/>
  37         </module>
  38         <module name="UniqueProperties">
  39             <property name="fileExtensions" value="properties" />
  40                 <property name="severity" value="error"/>
  41         </module>
  42
  43         <!--
  44                 Maximum line count for source files
  45                 (note this can't be inside TreeWalker)
  46         -->
  47         <module name="FileLength">
  48                 <property name="max" value="1200"/>
  49                 <property name="fileExtensions" value="java"/>
  50         </module>
  51
  52         <module name="TreeWalker">
  53
  54                 <property name="tabWidth" value="4"/>
  55
  56                 <!--
  57                         Enables parsing of suppressions comments
  58                         see http://checkstyle.sourceforge.net/config_filters.html#SuppressionCommentFilter
  59                 -->
  60                 <module name="FileContentsHolder"/>
  61
  62         <!-- ****************************** -->
  63         <!--         NAMING STANDARDS       -->
  64         <!-- ****************************** -->
  65
  66                 <!--
  67                         Naming convention for member fields. Start with (optional) underscore, then
  68                         lower case, then camel case; no internal underscores
  69                 -->
  70                 <module name="MemberName">
  71                         <property name="format" value="^_?[a-z][a-zA-Z0-9]*$"/>
  72                 </module>
  73
  74                 <!--
  75                         Naming convention for methods. Start with (optional) underscore, then
  76                         lower case, then camel case; no internal underscores
  77                 -->
  78                 <module name="MethodName">
  79                         <property name="format" value="^_?[a-z]([a-zA-Z0-9]+)*$"/>
  80                 </module>
  81
  82                 <!--
  83                         Name pattern for local final variables.
  84                 -->
  85                 <module name="LocalFinalVariableName">
  86                         <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
  87                 </module>
  88
  89                 <!--
  90                         Name pattern for local variables
  91                 -->
  92                 <module name="LocalVariableName">
  93                         <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
  94                 </module>
  95
  96                 <!--
  97                         Name pattern for constants (static final fields)
  98                 -->
  99                 <module name="ConstantName">
 100                         <property name="format" value="^[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$"/>
 101                 </module>
 102
 103                 <!--
 104                         Name pattern for parameters (note no underscores allowed)
 105                 -->
 106                 <module name="ParameterName">
 107                         <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
 108                 </module>
 109
 110                 <!--
 111                         Name pattern for static (non-final) fields
 112                 -->
 113                 <module name="StaticVariableName">
 114                         <property name="format" value="^[a-z][a-zA-Z0-9_]*$"/>
 115                 </module>
 116
 117                 <!--
 118                         Name pattern for classes
 119                 -->
 120                 <module name="TypeName">
 121                         <property name="format" value="[A-Z][a-zA-Z0-9]*$"/>
 122                         <property name="tokens" value="CLASS_DEF"/>
 123                 </module>
 124
 125                 <!--
 126                         Name pattern for interfaces. All interfaces names must end with 'I'.
 127                         ** currently suppressed in checkstyle-suppress.xml **
 128                 -->
 129                 <module name="TypeName">
 130                         <property name="id" value="InterfaceNaming"/>
 131                         <property name="format" value="^[A-Z][a-zA-Z0-9]*I$"/>
 132                         <property name="tokens" value="INTERFACE_DEF"/>
 133                         <message key="name.invalidPattern" value="Interface names should end in a I"/>
 134                 </module>
 135
 136                 <!--
 137                         Java package name pattern
 138                 -->
 139                 <module name="PackageName">
 140                         <property name="format" value="^[a-z]+(\.[a-z][a-z0-9]*)*$"/>
 141                 </module>
 142
 143         <!-- ****************************** -->
 144         <!--         LAYOUT AND STYLE       -->
 145         <!-- ****************************** -->
 146
 147                 <!--
 148                         Only one top level type per source file
 149                 -->
 150                 <module name="OuterTypeNumber"/>
 151
 152                 <!--
 153                         Ensure a class has a package declaration
 154                  -->
 155                 <module name="PackageDeclaration"/>
 156
 157                 <!--
 158                         see http://www.oracle.com/technetwork/java/javase/documentation/codeconventions-141855.html#1852
 159                         1. Class (static) variables: public, protected, package, private
 160                         2. Instance variables: public, protected, package, private
 161                         3. Constructors
 162                         4. Methods
 163                  -->
 164                 <module name="DeclarationOrder"/>
 165
 166                 <!--
 167                         Modifier order should conform to JLS
 168                         see http://checkstyle.sourceforge.net/config_modifier.html#ModifierOrder
 169                         public protected private abstract static final transient volatile synchronized native strictfp
 170                 -->
 171                 <module name="ModifierOrder"/>
 172
 173                 <!--
 174                         Declare variables in separate statements, for readability and bug avoidance
 175                  -->
 176                 <module name="MultipleVariableDeclarations"/>
 177
 178                 <!--
 179                         Don't have more than one statement on a line
 180                         (code formatting on save may enforce this anyway)
 181                  -->
 182                 <module name="OneStatementPerLine"/>
 183
 184                 <!--
 185                         Declare variables close to their point of first use
 186                         (doesn't handle variables used inside loops very well)
 187                 -->
 188                 <module name="VariableDeclarationUsageDistance">
 189                         <property name="allowedDistance" value="5" />
 190                         <message key="variable.declaration.usage.distance.extend"
 191                                 value="Distance between declaration of ''{0}'' and its first use is {1}, suggested maximum is {2}. Consider moving, or make final if it may not be modified." />
 192                 </module>
 193
 194                 <!--
 195                         Only use blocks within control statements
 196                 -->
 197                 <module name="AvoidNestedBlocks" />
 198
 199                 <!--
 200                         Require at least a comment within a block.
 201                         Note this will accept auto-generated // TODO comments,
 202                         (but they should be flagged up by the TodoComment rule)
 203                 -->
 204                 <module name="EmptyBlock">
 205                         <property name="option" value="text"/>
 206                 </module>
 207
 208                 <!--
 209                         Require braces round all code blocks within if/else/for/do/while
 210                 -->
 211                 <module name="NeedBraces"/>
 212
 213                 <!--
 214                         Disallow empty ';' statements
 215                 -->
 216                 <module name="EmptyStatement"/>
 217
 218                 <!--
 219                         Maximum number of return statements for a method
 220                 -->
 221                 <module name="ReturnCount">
 222                         <property name="max" value="4"/>
 223                 </module>
 224
 225                 <!--
 226                         Don't use modifiers in contexts where their value is not optional,
 227                         for example all interface methods are always public
 228                         see http://checkstyle.sourceforge.net/config_modifier.html#RedundantModifier
 229                 -->
 230                 <module name="RedundantModifier"/>
 231
 232                 <!--
 233                         Variables whose value is not modified should be declared final, both to show the
 234                     program's intent, and to  allow compiler optimisation
 235                     ** currently suppressed in checkstyle-suppress.xml **
 236                  -->
 237                 <module name="FinalLocalVariable">
 238                         <property name="tokens" value="VARIABLE_DEF" />
 239                 </module>
 240
 241                 <!--
 242                         Disallows shorthand of assigning values within an expression
 243                 -->
 244                 <module name="InnerAssignment"/>
 245
 246                 <!--
 247                         Use Java style array declarations to assist in readability
 248                 -->
 249                 <module name="ArrayTypeStyle"/>
 250
 251                 <!--
 252                         Use L not l to define a long constant
 253                 -->
 254                 <module name="UpperEll"/>
 255
 256         <!-- ****************************** -->
 257         <!--           SIZE LIMITS          -->
 258         <!-- ****************************** -->
 259
 260                 <!--
 261                         Maximum line count for methods
 262                 -->
 263                 <module name="MethodLength">
 264                         <property name="tokens" value="METHOD_DEF"/>
 265                         <property name="max" value="50"/>
 266                         <property name="countEmpty" value="false"/>
 267                 </module>
 268
 269                 <!--
 270                         Maximum statement count for methods, constructors,
 271                         instance initialisation and static initialisation blocks
 272                 -->
 273                 <module name="ExecutableStatementCount">
 274                         <property name="max" value="30"/>
 275                         <property name="tokens" value="METHOD_DEF"/>
 276                 </module>
 277                 <module name="ExecutableStatementCount">
 278                         <property name="max" value="30"/>
 279                         <property name="tokens" value="CTOR_DEF"/>
 280                 </module>
 281                 <module name="ExecutableStatementCount">
 282                         <property name="max" value="4"/>
 283                         <property name="tokens" value="INSTANCE_INIT"/>
 284                 </module>
 285                 <module name="ExecutableStatementCount">
 286                         <property name="id" value="NoStaticInitialization"/>
 287                         <property name="max" value="0"/>
 288                         <property name="tokens" value="STATIC_INIT"/>
 289                 </module>
 290
 291                 <!--
 292                         Maximum parameter count for methods
 293                 -->
 294                 <module name="ParameterNumber">
 295                         <property name="max" value="5"/>
 296                 </module>
 297
 298                 <!--
 299                         Maximum line length for anonymous inner classes
 300                 -->
 301                 <module name="AnonInnerLength">
 302                         <property name="max" value="40"/>
 303                 </module>
 304
 305         <!-- ****************************** -->
 306         <!--            IMPORTS             -->
 307         <!-- ****************************** -->
 308
 309                 <!--
 310                         Ensures that there are no redundant or unused imports.
 311                      Should be handled by Save actions if using Eclipse
 312                 -->
 313                 <module name="RedundantImport"/>
 314                 <module name="UnusedImports"/>
 315
 316                 <!--
 317                         Disallow * imports; may also be enforced by IDE Save Actions
 318                 -->
 319                 <module name="AvoidStarImport"/>
 320
 321                 <!--
 322                         Disallow import of sun.* packages as they are not portable
 323                 -->
 324                 <module name="IllegalImport"/>
 325
 326                 <!--
 327                         rules as to what packages each package may (not) import
 328                         see http://checkstyle.sourceforge.net/config_imports.html#ImportControl
 329                 -->
 330                 <module name="ImportControl">
 331                     <property name="file" value="${basedir}/utils/checkstyle/import-control.xml"/>
 332                         <property name="severity" value="error"/>
 333                 </module>
 334
 335         <!-- ****************************** -->
 336         <!--         CATCH and THROW        -->
 337         <!-- ****************************** -->
 338
 339                 <!--
 340                         Disallow catch of Exception, RunTimeException or Error
 341                 -->
 342                 <module name="IllegalCatch"/>
 343
 344                 <!--
 345                         Disallow throw of Exception, RunTimeException or Error
 346                 -->
 347                 <module name="IllegalThrows"/>
 348
 349         <!-- ****************************** -->
 350         <!--          CODING CHECKS         -->
 351         <!-- ****************************** -->
 352
 353                 <!--
 354                         Check for use of factory method rather than constructor for specified classes
 355                         e.g. Boolean.valueOf(true) rather than new Boolean(true)
 356                 -->
 357                 <module name="IllegalInstantiation">
 358                         <property name="classes" value="java.lang.Boolean"/>
 359                 </module>
 360
 361                 <!--
 362                         Check that "string".equals(value) is used rather than value.equals("string")
 363                 -->
 364                 <module name="EqualsAvoidNull"/>
 365
 366                 <!--
 367                         Check that equals() and hashCode() are always overridden together
 368                 -->
 369                 <module name="EqualsHashCode"/>
 370
 371                 <!--
 372                         Require switch statements to include a default
 373                 -->
 374                 <module name="MissingSwitchDefault"/>
 375
 376                 <!--
 377                         Check that switch default follows all case statements
 378                  -->
 379                 <module name="DefaultComesLast">
 380                         <property name="severity" value="error"/>
 381                 </module>
 382
 383                 <!--
 384                         Disallows fall-through in switch statements
 385                         i.e. a case without a break, return, throw or continue
 386                         NB a comment with the words "fall[s] through" suppresses this message
 387                  -->
 388                 <module name="FallThrough">
 389                         <property name="severity" value="error" />
 390                 </module>
 391
 392                 <!--
 393                         Warn if boolean expressions can be simplified
 394                 -->
 395                 <module name="SimplifyBooleanExpression"/>
 396
 397                 <!--
 398                         Warn if boolean return expressions can be simplified
 399                 -->
 400                 <module name="SimplifyBooleanReturn"/>
 401
 402                 <!--
 403                         Classes with only private constructors should be declared final
 404                 -->
 405                 <module name="FinalClass"/>
 406
 407                 <!--
 408                         Classes with only static methods should not be instantiable,
 409                         so should declare a private default constructor.
 410                 -->
 411                 <module name="HideUtilityClassConstructor"/>
 412
 413                 <!--
 414                         An Interface should declare methods (do not use to define constants only)
 415                 -->
 416                 <module name="InterfaceIsType"/>
 417
 418                 <!--
 419                         Disallow public fields in classes (other than constants)
 420                 -->
 421                 <module name="VisibilityModifier">
 422                         <property name="packageAllowed" value="true"/>
 423                         <property name="allowPublicImmutableFields" value="true"/>
 424                 </module>
 425
 426                 <!--
 427                         Checks that a local variable or a parameter does not shadow a field that is defined in the same class.
 428                         Note this should also be configured as a compiler warning in the IDE.
 429                 -->
 430                 <module name="HiddenField"/>
 431
 432                 <!--
 433                         Check that proper logging is used.
 434                         This may be suppressed in the class that provides logging functions.
 435                 -->
 436                 <module name="RegexpSinglelineJava">
 437                         <property name="id" value="NoSysout" />
 438                         <property name="format" value="System\.out\.println"/>
 439                         <property name="ignoreComments" value="true"/>
 440                         <message key="regexp.exceeded" value="Should use jalview.bin.Cache.log for logging"/>
 441                 </module>
 442                 <module name="RegexpSinglelineJava">
 443                         <property name="id" value="NoSyserr" />
 444                         <property name="format" value="System\.err\.println"/>
 445                         <property name="ignoreComments" value="true"/>
 446                         <message key="regexp.exceeded" value="Should use jalview.bin.Cache.log for logging"/>
 447                 </module>
 448
 449                 <!--
 450                         Checks that classes that define a covariant equals() method also override
 451                         method equals(java.lang.Object).
 452                  -->
 453                 <module name="CovariantEquals"/>
 454
 455                 <!--
 456                         Checks that there are no "magic numbers" (numeric literals)
 457                 -->
 458                 <module name="MagicNumber">
 459                         <property name="ignoreNumbers" value="-1,0,1,2"/>
 460                 </module>
 461
 462                 <!--
 463                         Check that  loop control variables are not modified inside the for block
 464                  -->
 465                 <module name="ModifiedControlVariable">
 466                 </module>
 467
 468                 <!--
 469                         Checks that string literals are not used with == or !=.
 470                  -->
 471                 <module name="StringLiteralEquality">
 472                 </module>
 473
 474                 <!--
 475                         Don't override clone - it never works!
 476                  -->
 477                 <module name="NoClone"/>
 478
 479                 <!--
 480                         Checks that clone() invokes super.clone()
 481                         (for classes that break the NoClone rule)
 482                  -->
 483                 <module name="SuperClone"/>
 484
 485                 <!--
 486                         Checks that finalize() invokes super.finalize()
 487                  -->
 488                 <module name="SuperFinalize"/>
 489
 490                 <!--
 491                         Disallow assignment of parameters.
 492                  -->
 493                 <module name="ParameterAssignment"/>
 494
 495                 <!--
 496                         Checks for multiple occurrences of the same string literal within a single file.
 497                         NB - does not check for the same string in different files.
 498                  -->
 499                 <module name="MultipleStringLiterals">
 500                         <property name="allowedDuplicates" value="1"/>
 501                 </module>
 502
 503                 <!--
 504                         Checks that exceptions are immutable (have only final fields)
 505                  -->
 506                 <module name="MutableException"/>
 507
 508                 <!--
 509                         A general rule to check for source text tokens that shouldn't be there
 510                         see http://checkstyle.sourceforge.net/apidocs/com/puppycrawl/tools/checkstyle/api/TokenTypes.html
 511                  -->
 512                 <module name="IllegalToken">
 513                    <property name="tokens" value="LITERAL_ASSERT"/>
 514                 </module>
 515
 516         <!-- ****************************** -->
 517         <!--           COMPLEXITY           -->
 518         <!-- ****************************** -->
 519
 520                 <!--
 521                         Restrict the number of number of &&, ||, &, |  and ^ in an expression.
 522                         Note that the operators & and | are not only integer bitwise operators, they are also the
 523                         non-shortcut versions of the boolean operators && and ||.
 524                  -->
 525                 <module name="BooleanExpressionComplexity">
 526                         <property name="max" value="3"/>
 527                 </module>
 528
 529                 <!--
 530                         This metric measures the number of instantiations of other classes within the given class.
 531                         The higher the DAC, the more complex the data structure of the system.
 532                  -->
 533                 <module name="ClassDataAbstractionCoupling">
 534                         <property name="max" value="7"/>
 535                 </module>
 536
 537                 <!--
 538                         The number of other classes a class relies on. A high number indicates over-complex
 539                         class interdependencies that might benefit from refactoring.
 540                  -->
 541                 <module name="ClassFanOutComplexity">
 542                 <property name="max" value="10"/>
 543         </module>
 544
 545                 <!--
 546                         Checks cyclomatic complexity against a specified limit. The complexity is a measure
 547                         of the minimum number of possible paths through the source and therefore the number of required
 548                         tests. Consider re-factoring if at or above 10.
 549                  -->
 550                 <module name="CyclomaticComplexity">
 551                         <property name="max" value="15"/>
 552                 </module>
 553
 554                 <!--
 555                         The NPATH metric computes the number of possible execution paths through a function. It takes
 556                         into account the nesting of conditional statements and multi-part boolean expressions
 557                         (e.g., A && B, C || D, etc.).
 558                  -->
 559                 <module name="NPathComplexity">
 560                         <property name="max" value="200"/>
 561                 </module>
 562
 563                 <!--
 564                         Maximum number of throws statements in a method
 565                  -->
 566                 <module name="ThrowsCount">
 567                         <property name="max" value="2"/>
 568                 </module>
 569
 570                 <!--
 571                         Maximum if-else depth
 572                  -->
 573                 <module name="NestedIfDepth">
 574                         <property name="max" value="4"/>
 575                 </module>
 576
 577                 <!--
 578                         Restricts nested try blocks to a specified depth.
 579                  -->
 580                 <module name="NestedTryDepth">
 581                         <property name="max" value="2"/>
 582                 </module>
 583
 584         <!-- ****************************** -->
 585         <!--              TODO              -->
 586         <!-- ****************************** -->
 587
 588                 <!--
 589                         Checks for uncommented main() methods (debugging leftovers)
 590                  -->
 591                 <module name="UncommentedMain"/>
 592
 593                 <!--
 594                         Check for TODO and similar comments
 595                 -->
 596                 <module name="TodoComment">
 597                         <property name="format" value="(TODO)|(FIXME)|(DOCUMENT ME)"/>
 598                 </module>
 599
 600         </module>
 601 </module>