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>

The Class Properties.

Since:

0.8

Author:

Haiyang Li

Nested Class Summary

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

Map.Entry<K extends Object,V extends Object>

Constructor Summary

Constructors

Constructor	Description
Properties()	Instantiates a new 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 Detail

Properties

public Properties()

Instantiates a new properties.

Method Detail

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:

true, if successful

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:

true, if successful

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<K,V>

Parameters:

key -

Returns:

true, if successful

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<K,V>

Parameters:

value -

Returns:

true, if successful

keySet

public Set<K> keySet()

Specified by:

keySet in interface Map<K,V>

Returns:

values

public Collection<V> values()

Specified by:

values in interface Map<K,V>

Returns:

entrySet

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

Specified by:

entrySet in interface Map<K,V>

Returns:

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>

Returns:

clear

public void clear()

Clear.

Specified by:

clear in interface Map<K,V>

copy

public Properties<K,V> copy()

Returns:

hashCode

public int hashCode()

Specified by:

hashCode in interface Map<K,V>

Overrides:

hashCode in class Object

Returns:

equals

public boolean equals(Object obj)

Specified by:

equals in interface Map<K,V>

Overrides:

equals in class Object

Parameters:

obj -

Returns:

true, if successful

toString

public String toString()

Overrides:

toString in class Object

Returns: