Package: groovy.lang

## [Java] Annotation Type Grab

- groovy.lang.Grab

-     @Retention(RetentionPolicy.SOURCE)
      @Target({
              ElementType.CONSTRUCTOR,
              ElementType.FIELD,
              ElementType.LOCAL_VARIABLE,
              ElementType.METHOD,
              ElementType.PARAMETER,
              ElementType.TYPE})
      public @interface Grab

  Used to grab the referenced artifact and its dependencies and make it available on the Classpath.

  Some examples:

       @Grab(group='commons-lang', module='commons-lang', version='2.4')
       import org.apache.commons.lang.WordUtils
       println "Hello ${WordUtils.capitalize('world')}"

  Or using the compact Gradle-inspired syntax:

       @Grab('commons-lang:commons-lang:2.4')
       import org.apache.commons.lang.WordUtils
       println "Hello ${WordUtils.capitalize('world')}"

  or the same thing again using the Ivy-inspired syntax variant:

       @Grab('commons-lang#commons-lang;2.4')
       import org.apache.commons.lang.WordUtils
       println "Hello ${WordUtils.capitalize('world')}"

  Further information such as where artifacts are downloaded to, how to add additional resolvers, how to customise artifact resolution etc., can be found on the Grape documentation page: http://groovy-lang.org/grape.html.

- - ### Element Summary

    Optional Element Summary
    Type | Name and Description
    --- | ---
    `boolean` | `changing` Defaults to `false` but set to `true` if the dependency artifacts may change without a corresponding revision change.
    `String` | `classifier` The classifier if in use, e.g.: "jdk14" Default: ""
    `String` | `conf` The configuration if in use (normally only used by internal ivy repositories).
    `String` | `ext` The extension of the artifact (normally safe to leave at default value of "jar" but other values like "zip" are sometimes useful).
    `boolean` | `force` Defaults to `false` but set to `true` to indicate to the underlying Ivy conflict manager that this dependency should be forced to the given revision.
    `String` | `group` The organisation or group, e.g.: "org.apache.ant".
    `boolean` | `initClass` By default, when a `@Grab` annotation is used, a `Grape.grab()` call is added to the static initializers of the class the annotatable node appears in.
    `String` | `module` The module or artifact, e.g.: "ant-junit".
    `boolean` | `transitive` Defaults to `true` but set to `false` if you don't want transitive dependencies also to be downloaded.
    `String` | `type` The type of the artifact (normally safe to leave at default value of "jar" but other values like "sources" and "javadoc" are sometimes useful).
    `String` | `value` Allows a more compact convenience form in one of two formats with optional appended attributes.
    `String` | `version` The revision or version, e.g.: "1.7.1".

  - ### Inherited Methods Summary

    Inherited Methods
    Methods inherited from class | Name
    --- | ---
    `class Object` | `wait, wait, wait, equals, toString, hashCode, getClass, notify, notifyAll`

- - ### Element Detail

    - #### public boolean changing

      Defaults to `false` but set to `true` if the dependency artifacts may change without a corresponding revision change. Not normally recommended but may be useful for certain kinds of snapshot artifacts. May reduce the amount of underlying Ivy caching. Proper behavior may be dependent on the resolver in use.

      Default:
        false

    - #### public String classifier

      The classifier if in use, e.g.: "jdk14"

      Default:
        ""

    - #### public String conf

      The configuration if in use (normally only used by internal ivy repositories). One or more comma separated values with or without square brackets, e.g. for hibernate you might have "default,proxool,oscache" or "[default,dbcp,swarmcache]". This last hibernate example assumes you have set up such configurations in your local Ivy repo and have changed your grape config (using grapeConfig.xml) or the `@GrabConfig` annotation to point to that repo.

      Default:
        ""

    - #### public String ext

      The extension of the artifact (normally safe to leave at default value of "jar" but other values like "zip" are sometimes useful).

      Default:
        ""

    - #### public boolean force

      Defaults to `false` but set to `true` to indicate to the underlying Ivy conflict manager that this dependency should be forced to the given revision. Otherwise, depending on the conflict manager in play, a later compatible version might be used instead.

      Default:
        false

    - #### public String group

      The organisation or group, e.g.: "org.apache.ant". A non-empty value is required unless value() is used.

      Default:
        ""

    - #### public boolean initClass

      By default, when a `@Grab` annotation is used, a `Grape.grab()` call is added to the static initializers of the class the annotatable node appears in. If you wish to disable this, add `initClass=false` to the annotation.

      Default:
        true

    - #### public String module

      The module or artifact, e.g.: "ant-junit". A non-empty value is required unless value() is used.

      Default:
        ""

    - #### public boolean transitive

      Defaults to `true` but set to `false` if you don't want transitive dependencies also to be downloaded. You may then need additional `@Grab` statements for any required dependencies.

      Default:
        true

    - #### public String type

      The type of the artifact (normally safe to leave at default value of "jar" but other values like "sources" and "javadoc" are sometimes useful). But see also the "classifier" attribute which is also sometimes used for "sources" and "javadoc".

      Default:
        ""

    - #### public String value

      Allows a more compact convenience form in one of two formats with optional appended attributes. Must not be used if group(), module() or version() are used.

      You can choose either format but not mix-n-match:
      `group:module:version:classifier@ext` (where only group and module are required)
      `group#module;version[confs]` (where only group and module are required and confs, if used, is one or more comma separated configuration names)
      In addition, you can add any valid Ivy attributes at the end of your string value using semi-colon separated name = value pairs, e.g.:
      `@Grab('junit:junit:*;transitive=false')`
      `@Grab('group=junit;module=junit;version=4.8.2;classifier=javadoc')`

      Default:
        ""

    - #### public String version

      The revision or version, e.g.: "1.7.1". A non-empty value is required unless value() is used.

      Default:
        ""