# ComponentMetadataHandler

API Documentation: | `ComponentMetadataHandler`

Note: This class is incubating and may change in a future version of Gradle.

Allows the build to provide rules that modify the metadata of depended-on software components.

Possible uses of component metadata rules are:

- Setting the status and status scheme of a component, overriding the value specified in the component descriptor.
- Declaring whether or not a component is 'changing', thus impacting the cache behaviour of the component.

Example:

    dependencies {
        components {
            // Set the status and status scheme for every component belonging to a module in the group "org.foo"
            all { ComponentMetadataDetails details ->
                if (details.id.group == "org.foo") {
                    def version = details.id.version
                    // assuming status is last part of version string
                    details.status = version.substring(version.lastIndexOf("-") + 1)
                    details.statusScheme = ["bronze", "silver", "gold", "platinum"]
                }
            }

            // Treat all components in the module "org.foo:bar" as changing
            withModule("org.foo:bar") { ComponentMetadataDetails details ->
                details.changing = true
            }
        }
    }

### Properties

No properties

### Methods

Method | Description
`all(rule)` | Incubating Adds a rule closure that may modify the metadata of any resolved software component.
`all(ruleSource)` | Incubating Adds a rule that may modify the metadata of any resolved software component.
`all(rule)` | Incubating Adds a rule action that may modify the metadata of any resolved software component.
`withModule(id, rule)` | Incubating Adds a rule that may modify the metadata of any resolved software component belonging to the specified module.
`withModule(id, ruleSource)` | Incubating Adds a rule that may modify the metadata of any resolved software component belonging to the specified module.
`withModule(id, rule)` | Incubating Adds a rule that may modify the metadata of any resolved software component belonging to the specified module.

### Script blocks

No script blocks

### Method details

#### `ComponentMetadataHandler` `all`(``Closure`<?>` rule)

Note: This method is incubating and may change in a future version of Gradle.

Adds a rule closure that may modify the metadata of any resolved software component.

The supplied rule closure must declare a `ComponentMetadataDetails` as it's first parameter, allowing the component metadata to be modified.

In addition, the rule can declare additional (read-only) parameters, which may provide extra details about the component. The order of these additional parameters is not significant.

The following additional parameter types are supported:

- `IvyModuleDescriptor` - additional Ivy-specific metadata. Rules declaring this parameter will only be invoked for components packaged as an Ivy module.

#### `ComponentMetadataHandler` `all`(`Object` ruleSource)

Note: This method is incubating and may change in a future version of Gradle.

Adds a rule that may modify the metadata of any resolved software component.

The ruleSource is an Object that has a single rule method annotated with `Mutate`.

This rule method:

- must return void.
- must have `ComponentMetadataDetails` as the first parameter.
- may have an additional parameter of type `IvyModuleDescriptor`.

#### `ComponentMetadataHandler` `all`(``Action`<? super `ComponentMetadataDetails`>` rule)

Note: This method is incubating and may change in a future version of Gradle.

Adds a rule action that may modify the metadata of any resolved software component.

#### `ComponentMetadataHandler` `withModule`(`Object` id, ``Closure`<?>` rule)

Note: This method is incubating and may change in a future version of Gradle.

Adds a rule that may modify the metadata of any resolved software component belonging to the specified module.

The rule closure parameter is subject to the same requirements as `ComponentMetadataHandler.all()`.

#### `ComponentMetadataHandler` `withModule`(`Object` id, `Object` ruleSource)

Note: This method is incubating and may change in a future version of Gradle.

Adds a rule that may modify the metadata of any resolved software component belonging to the specified module.

The rule source parameter is subject to the same requirements as `ComponentMetadataHandler.all()`.

#### `ComponentMetadataHandler` `withModule`(`Object` id, ``Action`<? super `ComponentMetadataDetails`>` rule)

Note: This method is incubating and may change in a future version of Gradle.

Adds a rule that may modify the metadata of any resolved software component belonging to the specified module.