FileTabCharacterCheck (checkstyle 8.36.1 API)

java.lang.Object
- com.puppycrawl.tools.checkstyle.api.AutomaticBean
- - com.puppycrawl.tools.checkstyle.api.AbstractViolationReporter
  - - com.puppycrawl.tools.checkstyle.api.AbstractFileSetCheck
    - - com.puppycrawl.tools.checkstyle.checks.whitespace.FileTabCharacterCheck

All Implemented Interfaces:

Configurable, Contextualizable, FileSetCheck
```
public class FileTabCharacterCheck
extends AbstractFileSetCheck
```
Checks that there are no tab characters ('\t') in the source code.

Rationale:
- Developers should not need to configure the tab width of their text editors in order to be able to read source code.
- From the Apache jakarta coding standards: In a distributed development environment, when the commit messages get sent to a mailing list, they are almost impossible to read if you use tabs.
- Property eachLine - Control whether to report on each line containing a tab, or just the first instance. Type is boolean. Default value is false.
- Property fileExtensions - Specify file type extension of files to process. Type is java.lang.String[]. Default value is "".
To configure the check to report on the first instance in each file:
```
 <module name="FileTabCharacter"/>
 
```
To configure the check to report on each line in each file:
```
 <module name="FileTabCharacter">
   <property name="eachLine" value="true"/>
 </module>
 
```
Parent is com.puppycrawl.tools.checkstyle.Checker

Violation Message Keys:
- containsTab
- file.containsTab
Since:

5.0

Nested Class Summary
- Nested classes/interfaces inherited from class com.puppycrawl.tools.checkstyle.api.AutomaticBean
  AutomaticBean.OutputStreamOptions

Field Summary

Fields
Modifier and Type	Field	Description
`static java.lang.String`	`MSG_CONTAINS_TAB`	A key is pointing to the warning message text in "messages.properties" file.
`static java.lang.String`	`MSG_FILE_CONTAINS_TAB`	A key is pointing to the warning message text in "messages.properties" file.

Constructor Summary

Constructors
Constructor Description

FileTabCharacterCheck()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected void`	`processFiltered(java.io.File file, FileText fileText)`	Called to process a file that matches the specified file extensions.
`void`	`setEachLine(boolean eachLine)`	Setter to control whether to report on each line containing a tab, or just the first instance.

Methods inherited from class com.puppycrawl.tools.checkstyle.api.AbstractFileSetCheck
addMessages, beginProcessing, destroy, finishProcessing, fireErrors, getFileContents, getFileExtensions, getMessageDispatcher, getMessages, getTabWidth, init, log, log, process, setFileContents, setFileExtensions, setMessageDispatcher, setTabWidth

Methods inherited from class com.puppycrawl.tools.checkstyle.api.AbstractViolationReporter
finishLocalSetup, getCustomMessages, getId, getMessageBundle, getSeverity, getSeverityLevel, setId, setSeverity

Methods inherited from class com.puppycrawl.tools.checkstyle.api.AutomaticBean
configure, contextualize, getConfiguration, setupChild

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.puppycrawl.tools.checkstyle.api.Configurable
configure

Methods inherited from interface com.puppycrawl.tools.checkstyle.api.Contextualizable
contextualize

- Field Detail
  - MSG_CONTAINS_TAB
```
public static final java.lang.String MSG_CONTAINS_TAB
```
    A key is pointing to the warning message text in "messages.properties" file.
    
    See Also:
    
    Constant Field Values
  - MSG_FILE_CONTAINS_TAB
```
public static final java.lang.String MSG_FILE_CONTAINS_TAB
```
    A key is pointing to the warning message text in "messages.properties" file.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - FileTabCharacterCheck
```
public FileTabCharacterCheck()
```
- Method Detail
  - processFiltered
```
protected void processFiltered(java.io.File file,
                               FileText fileText)
```
    Description copied from class: AbstractFileSetCheck
    
    Called to process a file that matches the specified file extensions.
    
    Specified by:
    
    processFiltered in class AbstractFileSetCheck
    
    Parameters:
    
    file - the file to be processed
    
    fileText - the contents of the file.
  - setEachLine
```
public void setEachLine(boolean eachLine)
```
    Setter to control whether to report on each line containing a tab, or just the first instance.
    
    Parameters:
    
    eachLine - Whether report on each line containing a tab.