Package com.landawn.abacus.util

Class Properties<K,V>

java.lang.Object

com.landawn.abacus.util.Properties<K,V>

Type Parameters:

K - the key type

V - the value type

All Implemented Interfaces:

Map<K,V>

public class Properties<K,V>
extends Object
implements Map<K,V>

Since:

0.8

Author:

Haiyang Li

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Constructor Summary

Constructors

Constructor	Description
Properties()

Method Summary

Modifier and Type	Method	Description
void	clear()	Clear.
boolean	containsKey(Object key)
boolean	containsValue(Object value)
Properties<K,V>	copy()
Set<Map.Entry<K,V>>	entrySet()
boolean	equals(Object obj)
static <K, V> Properties<K,V>	from(Map<? extends K,? extends V> map)
<T> T	get(Class<T> targetClass, Object propName)	To avoid NullPointerException for primitive type if the target property is null or not set.
V	get(Object propName)
<T> T	getOrDefault(Class<T> targetClass, Object propName, T defaultValue)	Gets the or default.
V	getOrDefault(Object propName, V defaultValue)	Gets the or default.
int	hashCode()
boolean	isEmpty()	Checks if is empty.
Set<K>	keySet()
V	put(K key, V value)
void	putAll(Map<? extends K,? extends V> m)
V	putIfAbsent(K key, V value)	Put if absent.
V	remove(Object key)
boolean	remove(Object key, Object value)	Removes the entry for the specified key only if it is currently mapped to the specified value.
V	replace(K key, V value)	Replaces the entry for the specified key only if it is currently mapped to some value.
boolean	replace(K key, V oldValue, V newValue)	Replaces the entry for the specified key only if currently mapped to the specified value.
Properties<K,V>	set(K propName, V propValue)
int	size()
String	toString()
Collection<V>	values()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, merge, replaceAll

Constructor Details

Properties

public Properties()

Method Details

from

public static <K,
V> Properties<K,V> from(Map<? extends K,? extends V> map)

Type Parameters:

K - the key type

V - the value type

Parameters:

map -

Returns:

get

public V get(Object propName)

Specified by:

get in interface Map<K,V>

Parameters:

propName -

Returns:

get

public <T> T get(Class<T> targetClass,
 Object propName)

To avoid NullPointerException for primitive type if the target property is null or not set.

Type Parameters:

T -

Parameters:

targetClass -

propName -

Returns:

getOrDefault

public V getOrDefault(Object propName,
 V defaultValue)

Gets the or default.

Specified by:

getOrDefault in interface Map<K,V>

Parameters:

propName -

defaultValue - is returned if the specified propName is not contained in this Properties instance or it's null.

Returns:

getOrDefault

public <T> T getOrDefault(Class<T> targetClass,
 Object propName,
 T defaultValue)

Gets the or default.

Type Parameters:

T -

Parameters:

targetClass -

propName -

defaultValue - is returned if the specified propName is not contained in this Properties instance or it's null.

Returns:

set

public Properties<K,V> set(K propName,
 V propValue)

Parameters:

propName -

propValue -

Returns:

put

public V put(K key,
 V value)

Specified by:

put in interface Map<K,V>

Parameters:

key -

value -

Returns:

putAll

public void putAll(Map<? extends K,? extends V> m)

Specified by:

putAll in interface Map<K,V>

Parameters:

m -

putIfAbsent

public V putIfAbsent(K key,
 V value)

Put if absent.

Specified by:

putIfAbsent in interface Map<K,V>

Parameters:

key -

value -

Returns:

remove

public V remove(Object key)

Specified by:

remove in interface Map<K,V>

Parameters:

key -

Returns:

remove

public boolean remove(Object key,
 Object value)

Removes the entry for the specified key only if it is currently mapped to the specified value.

Specified by:

remove in interface Map<K,V>

Parameters:

key -

value -

Returns:

replace

public V replace(K key,
 V value)

Replaces the entry for the specified key only if it is currently mapped to some value.

Specified by:

replace in interface Map<K,V>

Parameters:

key -

value -

Returns:

replace

public boolean replace(K key,
 V oldValue,
 V newValue)

Replaces the entry for the specified key only if currently mapped to the specified value.

Specified by:

replace in interface Map<K,V>

Parameters:

key -

oldValue -

newValue -

Returns:

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<K,V>

Parameters:

key -

Returns:

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<K,V>

Parameters:

value -

Returns:

keySet

public Set<K> keySet()

Specified by:

keySet in interface Map<K,V>

values

public Collection<V> values()

Specified by:

values in interface Map<K,V>

entrySet

public Set<Map.Entry<K,V>> entrySet()

Specified by:

entrySet in interface Map<K,V>

isEmpty

public boolean isEmpty()

Checks if is empty.

Specified by:

isEmpty in interface Map<K,V>

Returns:

true, if is empty

size

public int size()

Specified by:

size in interface Map<K,V>

clear

public void clear()

Clear.

Specified by:

clear in interface Map<K,V>

copy

public Properties<K,V> copy()

hashCode

public int hashCode()

Specified by:

hashCode in interface Map<K,V>

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Specified by:

equals in interface Map<K,V>

Overrides:

equals in class Object

Parameters:

obj -

Returns:

toString

public String toString()

Overrides:

toString in class Object