Package org.gbif.utils.file.properties

Class PropertiesUtil

java.lang.Object

org.gbif.utils.file.properties.PropertiesUtil

public final class PropertiesUtil
extends Object

Utility class for handling properties files. TODO this class should probably be in a "properties" package at the same level as "file"

Field Summary

Fields

Modifier and Type	Field	Description
static final String	UTF8_ENCODING	When we encode strings, we always specify UTF8 encoding

Method Summary

Modifier and Type	Method	Description
static Properties	filterProperties(Properties properties, String prefix)	Filters and translates Properties with a prefix.
static Properties	loadProperties(String propertiesFile)	Loads a properties file.
static boolean	propertyAsBool(Properties p, String key, boolean defaultValue)	Reads and casts the named property as a boolean.
static Double	propertyAsDouble(Properties p, String key, boolean exceptionForNull, Double defaultValue)	Reads and casts the named property as an Double.
static Float	propertyAsFloat(Properties p, String key, boolean exceptionForNull, Float defaultValue)	Reads and casts the named property as an Float.
static Integer	propertyAsInt(Properties p, String key, boolean exceptionForNull, Integer defaultValue)	Reads and casts the named property as an Integer.
static byte[]	propertyAsUTF8Bytes(Properties p, String key, boolean exceptionForNull, byte[] defaultValue)	Reads and converts the named property as UTF8 bytes.
static Properties	readFromFile(String filepath)	Reads a property file from an absolute filepath.
static Properties	removeProperties(Properties original, String prefix)	Remove properties from the original object and return the removed element(s) as new Properties object.
static Properties	subsetProperties(Properties original, String prefix)	Returns a new Properties object that contains only the elements where the key starts by the provided prefix.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

UTF8_ENCODING

public static final String UTF8_ENCODING

When we encode strings, we always specify UTF8 encoding

Method Details

loadProperties

public static Properties loadProperties(String propertiesFile)
                                 throws IOException,
IllegalArgumentException

Loads a properties file. The file should be available in the classpath, the default ClassLoader is used to load the file.

Throws:

IOException - Should there be an issue in loading the file

IllegalArgumentException - If the file does not exist

readFromFile

public static Properties readFromFile(String filepath)
                               throws IOException,
IllegalArgumentException

Reads a property file from an absolute filepath.

Throws:

IOException

IllegalArgumentException

propertyAsDouble

public static Double propertyAsDouble(Properties p,
 String key,
 boolean exceptionForNull,
 Double defaultValue)
                               throws IllegalArgumentException

Reads and casts the named property as an Double.

Parameters:

p - The properties file to read from.

key - To read the value of.

exceptionForNull - If true, and the property is not found an IAE is thrown, otherwise defaultValue is returned

defaultValue - If the property is not found, and exceptionForNull is false, this is returned for missing properties.

Returns:

The property at the key as an Double

Throws:

IllegalArgumentException - if the property is invalid (can't be cast to a double) or not found and we are instructed to throw it.

propertyAsFloat

public static Float propertyAsFloat(Properties p,
 String key,
 boolean exceptionForNull,
 Float defaultValue)
                             throws IllegalArgumentException

Reads and casts the named property as an Float.

Parameters:

p - The properties file to read from.

key - To read the value of.

exceptionForNull - If true, and the property is not found an IAE is thrown, otherwise defaultValue is returned

defaultValue - If the property is not found, and exceptionForNull is false, this is returned for missing properties.

Returns:

The property at the key as an Float

Throws:

IllegalArgumentException - if the property is invalid (can't be cast to a float) or not found and we are instructed to throw it.

propertyAsInt

public static Integer propertyAsInt(Properties p,
 String key,
 boolean exceptionForNull,
 Integer defaultValue)
                             throws IllegalArgumentException

Reads and casts the named property as an Integer.

Parameters:

p - The properties file to read from.

key - To read the value of.

exceptionForNull - If true, and the property is not found an IAE is thrown, otherwise defaultValue is returned

defaultValue - If the property is not found, and exceptionForNull is false, this is returned for missing properties.

Returns:

The property at the key as an int

Throws:

IllegalArgumentException - if the property is invalid (can't be cast to an int) or not found and we are instructed to throw it.

propertyAsBool

public static boolean propertyAsBool(Properties p,
 String key,
 boolean defaultValue)

Reads and casts the named property as a boolean. Case insensitive values for 'true', 'on', 'yes', 't' and 'y' return true values, 'false', 'off', 'no', 'f' and 'n' return false. Otherwise or in case of a missing property the default will be used.

Parameters:

p - The properties file to read from.

key - To read the value of.

defaultValue - If the property is not found this is returned for missing properties.

Returns:

The property at the key as a boolean

propertyAsUTF8Bytes

public static byte[] propertyAsUTF8Bytes(Properties p,
 String key,
 boolean exceptionForNull,
 byte[] defaultValue)
                                  throws IllegalArgumentException

Reads and converts the named property as UTF8 bytes.

Parameters:

p - The properties file to read from.

key - To read the value of.

exceptionForNull - If true, and the property is not found an IAE is thrown, otherwise defaultValue is returned

defaultValue - If the property is not found, and exceptionForNull is false, this is returned for missing properties.

Returns:

The property at the key as byte[]t

Throws:

IllegalArgumentException - if the property is not found and we are instructed to throw it.

filterProperties

public static Properties filterProperties(Properties properties,
 String prefix)

Filters and translates Properties with a prefix. The resulting Properties will only include the properties that start with the provided prefix with that prefix removed (e.g. myprefix.key1 will be returned as key1 if prefix = "myprefix.")

Parameters:

properties - to filter and translate

prefix - prefix used to filter the properties. (e.g. "myprefix.")

Returns:

new Properties object with filtered and translated properties. Never null.

subsetProperties

public static Properties subsetProperties(Properties original,
 String prefix)

Returns a new Properties object that contains only the elements where the key starts by the provided prefix. The same keys will be used in the returned Properties.

Parameters:

original -

prefix -

Returns:

removeProperties

public static Properties removeProperties(Properties original,
 String prefix)

Remove properties from the original object and return the removed element(s) as new Properties object. The same keys will be used in the returned Properties.

Parameters:

original - original object in which the element will be removed if key starts with provided prefix.

prefix -

Returns: