MavenPublication (Gradle API 2.10)
Date: 2015-12-21

Package: org.gradle.api.publish.maven

## [Java] Interface MavenPublication

- org.gradle.api.publish.Publication

- All Superinterfaces:
    Named, Publication

  A `MavenPublication` is the representation/configuration of how Gradle should publish something in Maven format. You directly add a named Maven Publication the project's `publishing.publications` container by providing MavenPublication as the type.

       publishing {
         publications {
           myPublicationName(MavenPublication) {
             // Configure the publication here
           }
         }
       }

  The default Maven POM identifying attributes are mapped as follows:
  - `groupId` - `project.group`
  - `artifactId` - `project.name`
  - `version` - `project.version`

  For certain common use cases, it's often sufficient to specify the component to publish, and nothing more (from(org.gradle.api.component.SoftwareComponent). The published component is used to determine which artifacts to publish, and which dependencies should be listed in the generated POM file.

  To add additional artifacts to the set published, use the artifact(Object) and artifact(Object, org.gradle.api.Action) methods. You can also completely replace the set of published artifacts using setArtifacts(Iterable). Together, these methods give you full control over what artifacts will be published.

  For any other tweaks to the publication, it is possible to modify the generated POM prior to publication. This is done using the MavenPom.withXml method of the POM returned via the getPom() method, or directly by an action (or closure) passed into pom(org.gradle.api.Action).

  #### Example of publishing a java module with a source artifact and custom POM description

       apply plugin: "java"
       apply plugin: "maven-publish"

       task sourceJar(type: Jar) {
         from sourceSets.main.allJava
         classifier "sources"
       }

       publishing {
         publications {
           myPublication(MavenPublication) {
             from components.java
             artifact sourceJar
             pom.withXml {
               asNode().appendNode('description', 'A demonstration of Maven POM customization')
             }
           }
         }
       }

  Since:
    1.4

- - ### Methods Summary

    Methods
    Type | Name and description
    --- | ---
    `MavenArtifact` | `artifact(Object source)` Creates a custom MavenArtifact to be included in the publication.
    `MavenArtifact` | `artifact(Object source, Action<? super MavenArtifact> config)` Creates an MavenArtifact to be included in the publication, which is configured by the associated action.
    `void` | `from(SoftwareComponent component)` Provides the software component that should be published.
    `String` | `getArtifactId()` Returns the artifactId for this publication.
    `MavenArtifactSet` | `getArtifacts()` Returns the complete set of artifacts for this publication.
    `String` | `getGroupId()` Returns the groupId for this publication.
    `MavenPom` | `getPom()` The POM that will be published.
    `String` | `getVersion()` Returns the version for this publication.
    `void` | `pom(Action<? super MavenPom> configure)` Configures the POM that will be published.
    `void` | `setArtifactId(String artifactId)` Sets the artifactId for this publication.
    `void` | `setArtifacts(Iterable<?> sources)` Clears any previously added artifacts from getArtifacts and creates artifacts from the specified sources.
    `void` | `setGroupId(String groupId)` Sets the groupId for this publication.
    `void` | `setVersion(String version)` Sets the version for this publication.

  - ### Inherited Methods Summary

    Inherited Methods
    Methods inherited from class | Name
    --- | ---
    `interface Named` | `getName`

- - ### Method Detail

    - #### public MavenArtifact artifact(Object source)

      Creates a custom MavenArtifact to be included in the publication. The `artifact` method can take a variety of input:

      - A PublishArtifact instance. Extension and classifier values are taken from the wrapped instance.
      - An AbstractArchiveTask instance. Extension and classifier values are taken from the wrapped instance.
      - Anything that can be resolved to a File via the Project.file method. Extension and classifier values are interpolated from the file name.
      - A Map that contains a 'source' entry that can be resolved as any of the other input types, including file. This map can contain a 'classifier' and an 'extension' entry to further configure the constructed artifact.
      The following example demonstrates the addition of various custom artifacts.

           apply plugin: "maven-publish"

           task sourceJar(type: Jar) {
             classifier "sources"
           }

           publishing {
             publications {
               maven(MavenPublication) {
                 artifact sourceJar // Publish the output of the sourceJar task
                 artifact 'my-file-name.jar' // Publish a file created outside of the build
                 artifact source: sourceJar, classifier: 'src', extension: 'zip'
               }
             }
           }

      Parameters:
        `source` - The source of the artifact content.

    - #### public MavenArtifact artifact(Object source, Action<? super MavenArtifact> config)

      Creates an MavenArtifact to be included in the publication, which is configured by the associated action. The first parameter is used to create a custom artifact and add it to the publication, as per artifact(Object). The created MavenArtifact is then configured using the supplied action, which can override the extension or classifier of the artifact. This method also accepts the configure action as a closure argument, by type coercion.

           apply plugin: "maven-publish"

           task sourceJar(type: Jar) {
             classifier "sources"
           }

           publishing {
             publications {
               maven(MavenPublication) {
                 artifact(sourceJar) {
                   // These values will be used instead of the values from the task. The task values will not be updated.
                   classifier "src"
                   extension "zip"
                 }
                 artifact("my-docs-file.htm") {
                   classifier "documentation"
                   extension "html"
                 }
               }
             }
           }

      Parameters:
        `source` - The source of the artifact.
        `config` - An action to configure the values of the constructed MavenArtifact.

    - #### public void from(SoftwareComponent component)

      Provides the software component that should be published.

      - Any artifacts declared by the component will be included in the publication.
      - The dependencies declared by the component will be included in the published meta-data.
      Currently 2 types of component are supported: 'components.java' (added by the JavaPlugin) and 'components.web' (added by the WarPlugin). For any individual MavenPublication, only a single component can be provided in this way. The following example demonstrates how to publish the 'java' component to a Maven repository.

           apply plugin: "java"
           apply plugin: "maven-publish"

           publishing {
             publications {
               maven(MavenPublication) {
                 from components.java
               }
             }
           }

      Parameters:
        `component` - The software component to publish.

    - #### public String getArtifactId()

      Returns the artifactId for this publication.

    - #### public MavenArtifactSet getArtifacts()

      Returns the complete set of artifacts for this publication.

      Returns:
        the artifacts.

    - #### public String getGroupId()

      Returns the groupId for this publication.

    - #### public MavenPom getPom()

      The POM that will be published.

      Returns:
        The POM that will be published.

    - #### public String getVersion()

      Returns the version for this publication.

    - #### public void pom(Action<? super MavenPom> configure)

      Configures the POM that will be published. The supplied action will be executed against the getPom() result. This method also accepts a closure argument, by type coercion.

      Parameters:
        `configure` - The configuration action.

    - #### public void setArtifactId(String artifactId)

      Sets the artifactId for this publication.

    - #### public void setArtifacts(Iterable<?> sources)

      Clears any previously added artifacts from getArtifacts and creates artifacts from the specified sources. Each supplied source is interpreted as per artifact(Object). For example, to exclude the dependencies declared by a component and instead use a custom set of artifacts:

           apply plugin: "java"
           apply plugin: "maven-publish"

           task sourceJar(type: Jar) {
             classifier "sources"
           }
           publishing {
             publications {
               maven(MavenPublication) {
                 from components.java
                 artifacts = ["my-custom-jar.jar", sourceJar]
               }
             }
           }

      Parameters:
        `sources` - The set of artifacts for this publication.

    - #### public void setGroupId(String groupId)

      Sets the groupId for this publication.

    - #### public void setVersion(String version)

      Sets the version for this publication.