beancp

Provide some processing APIs for Java objects, such as object copying(include bean copy,beans to Maps, lists to lists, strings to dates...), object cloning, getting or setting the values of Javabeans, etc

Maven

<dependency>
    <groupId>io.github.org-kepe</groupId>
    <artifactId>beancp</artifactId>
    <version>2.0.10</version>
</dependency>

Basic examples

//from bean to bean
DemoUser user = ...;
DemoConsumer consumer = BeancpUtil.copy(user, DemoConsumer.class);
//copy bean to exist bean
DemoUser user = ...;
DemoConsumer consumer = ...;
BeancpUtil.copy(user, consumer);
//basic type conversion
BigDecimal num = BeancpUtil.copy("123.4", BigDecimal.class);
//copy list to list
List<DemoUser> userList = ...;
List<DemoConsumer> consumerList = BeancpUtil.copy(userList, BeancpUtil.type(List.class,DemoConsumer.class));
//copy bean to map
DemoUser user = ...;
Map<String,Object> map = BeancpUtil.copy(user, Map.class);
...

Features:

• Support mutual conversion between Javabeans and Maps
• Support mutual conversion of List, array, and Set
• Support conversion of basic types (number, date, string, enum, byte [], etc.)
• Powerful performance, generated using bytecode
• By default, it supports the conversion of public attributes, but it can also support the conversion of protected and private attributes through feature parameters
• Provide APIs and annotations to support custom type conversions
• Support clone for any Object
• Support get or set properties for JavaBeans

Examples

Feature

//If the original value is null,will not set value
DemoUser user = ...;
DemoConsumer consumer = BeancpUtil.copy(user, DemoConsumer.class,BeancpFeature.SETVALUE_WHENNOTNULL);

Feature	description
SETVALUE_WHENNOTNULL	If the original value is null,will not set value
ALLWAYS_NEW	Copy a new object instead of the source object when assigning values
SETVALUE_TYPEEQUALS	Only when the type is consistent will value be set without type conversion
BEAN2MAP_UNDERLINE	When converting a Javabean to a map, the key of the map is in lowercase underlined form(userName->user_name)
BEAN2MAP_UNDERLINE_UPPER	When converting a Javabean to a map, the key of the map is in upper underlined form(userName->USER_NAME)
ACCESS_PROTECTED	Including protected attributes and default permission attributes
ACCESS_PRIVATE	Including protected default and private permission attributes
THROW_EXCEPTION	Throw an exception when encountering an exception

It can also be configured through global features with configAdd and configRemove

BeancpUtil.configAdd(BeancpFeature.SETVALUE_WHENNOTNULL);

context

//The 'id' property of the DemoConsumer class is not assigned a value
DemoUser user = ...;
DemoConsumer consumer = BeancpUtil.copy(user, DemoConsumer.class,BeancpUtil.newContext().disallowKey(DemoConsumer.class, "id"));

api	description
disallowKey	Disallow the assignment of certain attributes in a class
allowOnly	Only the assignment of certain attributes in the class
addValueFilter	add a value filter when set value for attribute
setExceptionFilter	set exception filter

annotation

	@BeancpIgnore
	private String firstName;
	
	@BeancpProperty("familyName")
	public String getLastName() {
		return lastName;
	}

annotation	description
@BeancpIgnore	ignore this method or field
@BeancpProperty	It can be placed on the parameters of methods, fields, and constructors, and set one or more other names. It can also be placed on a non get set method, and the beancp framework will automatically parse it as a get set method

clone

//clone object 
//If the object is cloneable, the clone method will be called, and if not, it will be copied by property.
DemoUser user = ...
DemoUser user2 = BeancpUtil.clone(user);

get and set property

//Obtain Javabean property value
String age=BeancpUtil.getProperty(user,"age",String.class);
String userName = BeancpUtil.getProperty(user,"userName",String.class);
//By default, the underline format is also supported.The same goes for setProperty
String userName1 = BeancpUtil.getProperty(user,"user_name",String.class);

//Setting Property Value for Javabeans
BeancpUtil.setProperty(user, "id", "a");
BeancpUtil.setProperty(user, "live", true);

api	description
getProperty	Obtain Javabean property value
setProperty	Setting Property Value for Javabeans

Custom Type Conversion

//register Custom Type Conversion
BeancpUtil.registerTypeConversion(DemoUser.class, DemoConsumer.class, (invocation,context,fromObj,toObj)->{
	DemoUser user=(DemoUser)fromObj;
	DemoConsumer consumer=(DemoConsumer)toObj;
	if(consumer==null) {
		consumer=new DemoConsumer();
	}
	consumer.setFamilyName(user.getLastName());
	return consumer;
}, 1);

...