Suppose a scenario, where User and Account classes are linked as below:
\n[groovy]
\nclass Account {
\n String email
\n String password
\n \/\/ … other fields
\n}<\/p>\n
class User {
\n Account account
\n String name
\n String address
\n \/\/ … other fields
\n}
\n[\/groovy]<\/p>\n
\n
At the time of creating a new User, and accessing the user members, we write something of this sort:
\n[groovy]
\n\/\/ For initalizing the user class first we have to initializing Account class.
\nAccount account = new Account(email:”amit.kumar@gmail.com”, password:”intelligrape”)
\n\/\/ Now have to pass that account instance for initializing User class
\nUser user = new User(account:account, name:”Amit”, address:”Intelligrape City”)<\/p>\n
\/\/ For Accessing User’s Account information we have to use “user.account” as prefix
\nprintln user.account.email
\nprintln user.account.password
\n[\/groovy]<\/p>\n
\n
It can be clearly seen that we have to write “user.account” as a prefix for accessing user’s account information and have to initialize account info separately. If we use @Delegate annotation before account declaration as below:
\n[groovy]
\n @Delegate Account account = new Account()
\n[\/groovy]<\/p>\n
\n
Time is saved and groovy will manage account for user automatically. We do not need to care for initializing account information separately.
\n[groovy]
\n\/\/ Initializing account information with User class.
\nUser user = new User(email:”amit.kumar@gmail.com”, password:”intelligrape”, name:”Amit”, address:”Intelligrape City”)
\n\/\/ Accessing User Account info with “user” prefix only instead of “user.account” prefix
\nprintln user.email
\nprintln user.password
\n[\/groovy]<\/p>\n
\n
Note:<\/strong> When you use @Delegate<\/strong> annotation, all the methods of delegated class(Account) are implement in current class(User), so we will be able to access those members with prefix (“user”) only.<\/p>\n Amit Kumar Suppose a scenario, where User and Account classes are linked as below: [groovy] class Account { String email String password \/\/ … other fields } class User { Account account String name String address \/\/ … other fields } [\/groovy] At the time of creating a new User, and accessing the user members, we write […]<\/p>\n","protected":false},"author":52,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":1,"footnotes":""},"categories":[7],"tags":[885,9],"class_list":["post-6406","post","type-post","status-publish","format-standard","hentry","category-grails","tag-delegate","tag-groovy"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t
\namit.kumar@intelligrape.com<\/a>
\nin.linkedin.com\/in\/amitkumar0110
\ntwitter.com\/amit_kumar0110
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