PropertiesUtil (Apache Log4j 2 2.8.2 API)

java.lang.Object
- org.apache.logging.log4j.util.PropertiesUtil

```
public final class PropertiesUtil
extends Object
```
Consider this class private.
Helps access properties. This utility provides a method to override system properties by specifying properties in a properties file.

Constructor Summary

Constructors
Constructor and Description
`PropertiesUtil(Properties props)` Constructs a PropertiesUtil using a given Properties object as its source of defined properties.
`PropertiesUtil(String propertiesFileName)` Constructs a PropertiesUtil for a given properties file name on the classpath.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`static Properties`	`extractSubset(Properties properties, String prefix)` Extracts properties that start with or are equals to the specific prefix and returns them in a new Properties object with the prefix removed.
`boolean`	`getBooleanProperty(String name)` Gets the named property as a boolean value.
`boolean`	`getBooleanProperty(String name, boolean defaultValue)` Gets the named property as a boolean value.
`Charset`	`getCharsetProperty(String name)` Gets the named property as a Charset value.
`Charset`	`getCharsetProperty(String name, Charset defaultValue)` Gets the named property as a Charset value.
`double`	`getDoubleProperty(String name, double defaultValue)` Gets the named property as a double.
`int`	`getIntegerProperty(String name, int defaultValue)` Gets the named property as an integer.
`long`	`getLongProperty(String name, long defaultValue)` Gets the named property as a long.
`static PropertiesUtil`	`getProperties()` Returns the PropertiesUtil used by Log4j.
`String`	`getStringProperty(String name)` Gets the named property as a String.
`String`	`getStringProperty(String name, String defaultValue)` Gets the named property as a String.
`static Properties`	`getSystemProperties()` Return the system properties or an empty Properties object if an error occurs.
`boolean`	`isOsWindows()` Returns true if system properties tell us we are running on Windows.
`static Map<String,Properties>`	`partitionOnCommonPrefixes(Properties properties)` Partitions a properties map based on common key prefixes up to the first period.

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

- Constructor Detail
  - PropertiesUtil
```
public PropertiesUtil(Properties props)
```
    Constructs a PropertiesUtil using a given Properties object as its source of defined properties.
    
    Parameters:
    
    props - the Properties to use by default
  - PropertiesUtil
```
public PropertiesUtil(String propertiesFileName)
```
    Constructs a PropertiesUtil for a given properties file name on the classpath. The properties specified in this file are used by default. If a property is not defined in this file, then the equivalent system property is used.
    
    Parameters:
    
    propertiesFileName - the location of properties file to load
- Method Detail
  - getProperties
```
public static PropertiesUtil getProperties()
```
    Returns the PropertiesUtil used by Log4j.
    
    Returns:
    
    the main Log4j PropertiesUtil instance.
  - getBooleanProperty
```
public boolean getBooleanProperty(String name)
```
    Gets the named property as a boolean value. If the property matches the string "true" (case-insensitive), then it is returned as the boolean value true. Any other non-null text in the property is considered false.
    
    Parameters:
    
    name - the name of the property to look up
    
    Returns:
    
    the boolean value of the property or false if undefined.
  - getBooleanProperty
```
public boolean getBooleanProperty(String name,
                                  boolean defaultValue)
```
    Gets the named property as a boolean value.
    
    Parameters:
    
    name - the name of the property to look up
    
    defaultValue - the default value to use if the property is undefined
    
    Returns:
    
    the boolean value of the property or defaultValue if undefined.
  - getCharsetProperty
```
public Charset getCharsetProperty(String name)
```
    Gets the named property as a Charset value.
    
    Parameters:
    
    name - the name of the property to look up
    
    Returns:
    
    the Charset value of the property or Charset.defaultCharset() if undefined.
  - getCharsetProperty
```
public Charset getCharsetProperty(String name,
                                  Charset defaultValue)
```
    Gets the named property as a Charset value.
    
    Parameters:
    
    name - the name of the property to look up
    
    defaultValue - the default value to use if the property is undefined
    
    Returns:
    
    the Charset value of the property or defaultValue if undefined.
  - getDoubleProperty
```
public double getDoubleProperty(String name,
                                double defaultValue)
```
    Gets the named property as a double.
    
    Parameters:
    
    name - the name of the property to look up
    
    defaultValue - the default value to use if the property is undefined
    
    Returns:
    
    the parsed double value of the property or defaultValue if it was undefined or could not be parsed.
  - getIntegerProperty
```
public int getIntegerProperty(String name,
                              int defaultValue)
```
    Gets the named property as an integer.
    
    Parameters:
    
    name - the name of the property to look up
    
    defaultValue - the default value to use if the property is undefined
    
    Returns:
    
    the parsed integer value of the property or defaultValue if it was undefined or could not be parsed.
  - getLongProperty
```
public long getLongProperty(String name,
                            long defaultValue)
```
    Gets the named property as a long.
    
    Parameters:
    
    name - the name of the property to look up
    
    defaultValue - the default value to use if the property is undefined
    
    Returns:
    
    the parsed long value of the property or defaultValue if it was undefined or could not be parsed.
  - getStringProperty
```
public String getStringProperty(String name)
```
    Gets the named property as a String.
    
    Parameters:
    
    name - the name of the property to look up
    
    Returns:
    
    the String value of the property or null if undefined.
  - getStringProperty
```
public String getStringProperty(String name,
                                String defaultValue)
```
    Gets the named property as a String.
    
    Parameters:
    
    name - the name of the property to look up
    
    defaultValue - the default value to use if the property is undefined
    
    Returns:
    
    the String value of the property or defaultValue if undefined.
  - getSystemProperties
```
public static Properties getSystemProperties()
```
    Return the system properties or an empty Properties object if an error occurs.
    
    Returns:
    
    The system properties.
  - extractSubset
```
public static Properties extractSubset(Properties properties,
                                       String prefix)
```
    Extracts properties that start with or are equals to the specific prefix and returns them in a new Properties object with the prefix removed.
    
    Parameters:
    
    properties - The Properties to evaluate.
    
    prefix - The prefix to extract.
    
    Returns:
    
    The subset of properties.
  - partitionOnCommonPrefixes
```
public static Map<String,Properties> partitionOnCommonPrefixes(Properties properties)
```
    Partitions a properties map based on common key prefixes up to the first period.
    
    Parameters:
    
    properties - properties to partition
    
    Returns:
    
    the partitioned properties where each key is the common prefix (minus the period) and the values are new property maps without the prefix and period in the key
    
    Since:
    
    2.6
  - isOsWindows
```
public boolean isOsWindows()
```
    Returns true if system properties tell us we are running on Windows.
    
    Returns:
    
    true if system properties tell us we are running on Windows.

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Class PropertiesUtil

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

PropertiesUtil

PropertiesUtil

Method Detail

getProperties

getBooleanProperty

getBooleanProperty

getCharsetProperty

getCharsetProperty

getDoubleProperty

getIntegerProperty

getLongProperty

getStringProperty

getStringProperty

getSystemProperties

extractSubset

partitionOnCommonPrefixes

isOsWindows