Module java.base
Package java.lang.module

Class ModuleDescriptor.Builder

java.lang.Object
java.lang.module.ModuleDescriptor.Builder
Enclosing class:
ModuleDescriptor
public static final class ModuleDescriptor.Builder extends Object
A builder for building ModuleDescriptor objects.

ModuleDescriptor defines the newModule, newOpenModule, and newAutomaticModule methods to create builders for building normal, open, and automatic modules.

The set of packages in the module are accumulated by the Builder as the exports, opens, packages, provides, and mainClass methods are invoked.

The module names, package names, and class names that are parameters specified to the builder methods are the module names, package names, and qualified names of classes (in named packages) as defined in the The Java Language Specification.

Example usage: 

    ModuleDescriptor descriptor = ModuleDescriptor.newModule("stats.core")
        .requires("java.base")
        .exports("org.acme.stats.core.clustering")
        .exports("org.acme.stats.core.regression")
        .packages(Set.of("org.acme.stats.core.internal"))
        .build();
API Note:
A Builder checks the components and invariants as components are added to the builder. The rationale for this is to detect errors as early as possible and not defer all validation to the build method.
Since:
9

  • Method Details

    • requires

      public ModuleDescriptor.Builder requires(ModuleDescriptor.Requires req)
      Adds a dependence on a module.
      Parameters:
      req - The dependence
      Returns:
      This builder
      Throws:
      IllegalArgumentException - If the dependence is on the module that this builder was initialized to build
      IllegalStateException - If the dependence on the module has already been declared or this builder is for an automatic module

    • requires

      public ModuleDescriptor.Builder requires(Set<ModuleDescriptor.Requires.Modifier> ms, String mn, ModuleDescriptor.Version compiledVersion)
      Adds a dependence on a module with the given (and possibly empty) set of modifiers. The dependence includes the version of the module that was recorded at compile-time.
      Parameters:
      ms - The set of modifiers
      mn - The module name
      compiledVersion - The version of the module recorded at compile-time
      Returns:
      This builder
      Throws:
      IllegalArgumentException - If the module name is null, is not a legal module name, or is equal to the module name that this builder was initialized to build
      IllegalStateException - If the dependence on the module has already been declared or this builder is for an automatic module

    • requires

      public ModuleDescriptor.Builder requires(Set<ModuleDescriptor.Requires.Modifier> ms, String mn)
      Adds a dependence on a module with the given (and possibly empty) set of modifiers.
      Parameters:
      ms - The set of modifiers
      mn - The module name
      Returns:
      This builder
      Throws:
      IllegalArgumentException - If the module name is null, is not a legal module name, or is equal to the module name that this builder was initialized to build
      IllegalStateException - If the dependence on the module has already been declared or this builder is for an automatic module

    • requires

      public ModuleDescriptor.Builder requires(String mn)
      Adds a dependence on a module with an empty set of modifiers.
      Parameters:
      mn - The module name
      Returns:
      This builder
      Throws:
      IllegalArgumentException - If the module name is null, is not a legal module name, or is equal to the module name that this builder was initialized to build
      IllegalStateException - If the dependence on the module has already been declared or this builder is for an automatic module

    • exports

      public ModuleDescriptor.Builder exports(ModuleDescriptor.Exports e)
      Adds an exported package.
      Parameters:
      e - The export
      Returns:
      This builder
      Throws:
      IllegalStateException - If the package is already declared as exported or this builder is for an automatic module

    • exports

      public ModuleDescriptor.Builder exports(Set<ModuleDescriptor.Exports.Modifier> ms, String pn, Set<String> targets)
      Adds an exported package with the given (and possibly empty) set of modifiers. The package is exported to a set of target modules.
      Parameters:
      ms - The set of modifiers
      pn - The package name
      targets - The set of target modules names
      Returns:
      This builder
      Throws:
      IllegalArgumentException - If the package name is null or is not a legal package name, the set of target modules is empty, or the set of target modules contains a name that is not a legal module name
      IllegalStateException - If the package is already declared as exported or this builder is for an automatic module

    • exports

      public ModuleDescriptor.Builder exports(Set<ModuleDescriptor.Exports.Modifier> ms, String pn)
      Adds an exported package with the given (and possibly empty) set of modifiers. The package is exported to all modules.
      Parameters:
      ms - The set of modifiers
      pn - The package name
      Returns:
      This builder
      Throws:
      IllegalArgumentException - If the package name is null or is not a legal package name
      IllegalStateException - If the package is already declared as exported or this builder is for an automatic module

    • exports

      public ModuleDescriptor.Builder exports(String pn, Set<String> targets)
      Adds an exported package. The package is exported to a set of target modules.
      Parameters:
      pn - The package name
      targets - The set of target modules names
      Returns:
      This builder
      Throws:
      IllegalArgumentException - If the package name is null or is not a legal package name, the set of target modules is empty, or the set of target modules contains a name that is not a legal module name
      IllegalStateException - If the package is already declared as exported or this builder is for an automatic module

    • exports

      public ModuleDescriptor.Builder exports(String pn)
      Adds an exported package. The package is exported to all modules.
      Parameters:
      pn - The package name
      Returns:
      This builder
      Throws:
      IllegalArgumentException - If the package name is null or is not a legal package name
      IllegalStateException - If the package is already declared as exported or this builder is for an automatic module

    • opens

      public ModuleDescriptor.Builder opens(ModuleDescriptor.Opens obj)
      Adds an open package.
      Parameters:
      obj - The Opens object
      Returns:
      This builder
      Throws:
      IllegalStateException - If the package is already declared as open, or this is a builder for an open module or automatic module

    • opens

      public ModuleDescriptor.Builder opens(Set<ModuleDescriptor.Opens.Modifier> ms, String pn, Set<String> targets)
      Adds an open package with the given (and possibly empty) set of modifiers. The package is open to a set of target modules.
      Parameters:
      ms - The set of modifiers
      pn - The package name
      targets - The set of target modules names
      Returns:
      This builder
      Throws:
      IllegalArgumentException - If the package name is null or is not a legal package name, the set of target modules is empty, or the set of target modules contains a name that is not a legal module name
      IllegalStateException - If the package is already declared as open, or this is a builder for an open module or automatic module

    • opens

      public ModuleDescriptor.Builder opens(Set<ModuleDescriptor.Opens.Modifier> ms, String pn)
      Adds an open package with the given (and possibly empty) set of modifiers. The package is open to all modules.
      Parameters:
      ms - The set of modifiers
      pn - The package name
      Returns:
      This builder
      Throws:
      IllegalArgumentException - If the package name is null or is not a legal package name
      IllegalStateException - If the package is already declared as open, or this is a builder for an open module or automatic module

    • opens

      public ModuleDescriptor.Builder opens(String pn, Set<String> targets)
      Adds an open package. The package is open to a set of target modules.
      Parameters:
      pn - The package name
      targets - The set of target modules names
      Returns:
      This builder
      Throws:
      IllegalArgumentException - If the package name is null or is not a legal package name, the set of target modules is empty, or the set of target modules contains a name that is not a legal module name
      IllegalStateException - If the package is already declared as open, or this is a builder for an open module or automatic module

    • opens

      public ModuleDescriptor.Builder opens(String pn)
      Adds an open package. The package is open to all modules.
      Parameters:
      pn - The package name
      Returns:
      This builder
      Throws:
      IllegalArgumentException - If the package name is null or is not a legal package name
      IllegalStateException - If the package is already declared as open, or this is a builder for an open module or automatic module

    • uses

      public ModuleDescriptor.Builder uses(String service)
      Adds a service dependence.
      Parameters:
      service - The service type
      Returns:
      This builder
      Throws:
      IllegalArgumentException - If the service type is null or not a qualified name of a class in a named package
      IllegalStateException - If a dependency on the service type has already been declared or this is a builder for an automatic module

    • provides

      public ModuleDescriptor.Builder provides(ModuleDescriptor.Provides p)
      Provides a service with one or more implementations. The package for each provider (or provider factory) is added to the module if not already added.
      Parameters:
      p - The provides
      Returns:
      This builder
      Throws:
      IllegalStateException - If the providers for the service type have already been declared

    • provides

      public ModuleDescriptor.Builder provides(String service, List<String> providers)
      Provides implementations of a service. The package for each provider (or provider factory) is added to the module if not already added.
      Parameters:
      service - The service type
      providers - The list of provider or provider factory class names
      Returns:
      This builder
      Throws:
      IllegalArgumentException - If the service type or any of the provider class names is null or not a qualified name of a class in a named package, or the list of provider class names is empty
      IllegalStateException - If the providers for the service type have already been declared

    • packages

      public ModuleDescriptor.Builder packages(Set<String> pns)
      Adds packages to the module. All packages in the set of package names that are not in the module are added to module.
      Parameters:
      pns - The (possibly empty) set of package names
      Returns:
      This builder
      Throws:
      IllegalArgumentException - If any of the package names is null or is not a legal package name

    • version

      public ModuleDescriptor.Builder version(ModuleDescriptor.Version v)
      Sets the module version.
      Parameters:
      v - The version
      Returns:
      This builder

    • version

      public ModuleDescriptor.Builder version(String vs)
      Sets the module version.
      Parameters:
      vs - The version string to parse
      Returns:
      This builder
      Throws:
      IllegalArgumentException - If vs is null or cannot be parsed as a version string
      See Also:

    • mainClass

      public ModuleDescriptor.Builder mainClass(String mc)
      Sets the module main class. The package for the main class is added to the module if not already added. In other words, this method is equivalent to first invoking this builder's packages method to add the package name of the main class.
      Parameters:
      mc - The module main class
      Returns:
      This builder
      Throws:
      IllegalArgumentException - If mainClass is null or not a qualified name of a class in a named package

    • build

      public ModuleDescriptor build()
      Builds and returns a ModuleDescriptor from its components.

      The module will require "java.base" even if the dependence has not been declared (the exception is when building a module named "java.base" as it cannot require itself). The dependence on "java.base" will have the MANDATED modifier if the dependence was not declared.

      Returns:
      The module descriptor