UniquePropertiesCheck (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.UniquePropertiesCheck

All Implemented Interfaces:

Configurable, Contextualizable, FileSetCheck
```
public class UniquePropertiesCheck
extends AbstractFileSetCheck
```
Detects duplicated keys in properties files.

Rationale: Multiple property keys usually appear after merge or rebase of several branches. While there are no problems in runtime, there can be a confusion due to having different values for the duplicated properties.
- Property fileExtensions - Specify file type extension of the files to check. Type is java.lang.String[]. Default value is .properties.
To configure the check:
```
 <module name="UniqueProperties">
   <property name="fileExtensions" value="properties" />
 </module>
 
```
Parent is com.puppycrawl.tools.checkstyle.Checker

Violation Message Keys:
- properties.duplicate.property
- unable.open.cause
Since:

5.7

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_IO_EXCEPTION_KEY`	Localization key for IO exception occurred on file open.
`static java.lang.String`	`MSG_KEY`	Localization key for check violation.

Constructor Summary

Constructors
Constructor Description

UniquePropertiesCheck()
Construct the check with default values.

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.

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_KEY
```
public static final java.lang.String MSG_KEY
```
    Localization key for check violation.
    
    See Also:
    
    Constant Field Values
  - MSG_IO_EXCEPTION_KEY
```
public static final java.lang.String MSG_IO_EXCEPTION_KEY
```
    Localization key for IO exception occurred on file open.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - UniquePropertiesCheck
```
public UniquePropertiesCheck()
```
    Construct the check with default values.
- 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.