Package org.apache.gravitino.utils

Class MapUtils

java.lang.Object

org.apache.gravitino.utils.MapUtils

public class MapUtils
extends Object

Utility class for working with maps.

Method Summary

Modifier and Type	Method	Description
static Map<String,String>	getFilteredMap(Map<String,String> m, Predicate predicate)	Returns a map with all keys that match the predicate.
static Map<String,String>	getMapWithoutPrefix(Map<String,String> m, String prefix)	Returns a new map containing entries whose keys do NOT start with the given prefix.
static Map<String,String>	getPrefixMap(Map<String,String> m, String prefix)	Returns a map with all keys that start with the given prefix.
static Map<String,String>	getPrefixMap(Map<String,String> m, String prefix, boolean keepPrefix)	Returns a map with all keys that start with the given prefix.
static int	propertyAsInt(Map<String,String> properties, String property, int defaultValue)	Extract an integer value from the properties map with provided key.
static long	propertyAsLong(Map<String,String> properties, String property, long defaultValue)	Extract a long value from the properties map with provided key.
static Map<String,String>	unmodifiableMap(Map<String,String> m)	Returns an unmodifiable map.

Methods inherited from class java.lang.Object

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

Method Details

getPrefixMap

public static Map<String,String> getPrefixMap(Map<String,String> m,
 String prefix)

Returns a map with all keys that start with the given prefix.

Parameters:

m - The map to filter.

prefix - The prefix to filter by.

Returns:

A map with all keys that start with the given prefix.

getPrefixMap

public static Map<String,String> getPrefixMap(Map<String,String> m,
 String prefix,
 boolean keepPrefix)

Returns a map with all keys that start with the given prefix.

Parameters:

m - The map to filter.

prefix - The prefix to filter by.

keepPrefix - Whether to keep the prefix in the key or not.

Returns:

A map with all keys that start with the given prefix.

getMapWithoutPrefix

public static Map<String,String> getMapWithoutPrefix(Map<String,String> m,
 String prefix)

Returns a new map containing entries whose keys do NOT start with the given prefix.

Parameters:

m - the original map

prefix - the prefix to exclude

Returns:

a filtered map without entries whose keys start with the prefix

getFilteredMap

public static Map<String,String> getFilteredMap(Map<String,String> m,
 Predicate predicate)

Returns a map with all keys that match the predicate.

Parameters:

m - The map to filter.

predicate - The predicate expression to filter the keys.

Returns:

A map with all keys that match the predicate.

unmodifiableMap

public static Map<String,String> unmodifiableMap(Map<String,String> m)

Returns an unmodifiable map.

Parameters:

m - The map to make unmodifiable.

Returns:

An unmodifiable map.

propertyAsInt

public static int propertyAsInt(Map<String,String> properties,
 String property,
 int defaultValue)

Extract an integer value from the properties map with provided key. If provided key not exist in the properties map, it will return default value.

Parameters:

properties - input map

property - provided key

defaultValue - default value

Returns:

integer value from the properties map with provided key.

propertyAsLong

public static long propertyAsLong(Map<String,String> properties,
 String property,
 long defaultValue)

Extract a long value from the properties map with provided key. If provided key not exist in the properties map, it will return default value.

Parameters:

properties - input map

property - provided key

defaultValue - default value

Returns:

long value from the properties map with provided key.