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# class Gem::Resolver::InstallerSet

A set of gems for installation sourced from remote sources and local .gem files

### Public Class Methods

new (domain)
Source

    # File lib/rubygems/resolver/installer_set.rb, line 38
    def initialize(domain)
      super()

      @domain = domain

      @f = Gem::SpecFetcher.fetcher

      @always_install      = []
      @ignore_dependencies = false
      @ignore_installed    = false
      @local               = {}
      @local_source        = Gem::Source::Local.new
      @remote_set          = Gem::Resolver::BestSet.new
      @force               = false
      @specs               = {}
    end

Creates a new `InstallerSet` that will look for gems in `domain`.

Calls superclass method `BasicObject::new`

### Public Instance Methods

add_always_install (dependency)
Source

    # File lib/rubygems/resolver/installer_set.rb, line 59
    def add_always_install(dependency)
      request = Gem::Resolver::DependencyRequest.new dependency, nil

      found = find_all request

      found.delete_if do |s|
        s.version.prerelease? && !s.local?
      end unless dependency.prerelease?

      found = found.select do |s|
        Gem::Source::SpecificFile === s.source ||
          Gem::Platform.match_spec?(s)
      end

      found = found.sort_by do |s|
        [s.version, Gem::Platform.sort_priority(s.platform)]
      end

      newest = found.last

      unless newest
        exc = Gem::UnsatisfiableDependencyError.new request
        exc.errors = errors

        raise exc
      end

      unless @force
        found_matching_metadata = found.reverse.find do |spec|
          metadata_satisfied?(spec)
        end

        if found_matching_metadata.nil?
          ensure_required_ruby_version_met(newest.spec)
          ensure_required_rubygems_version_met(newest.spec)
        else
          newest = found_matching_metadata
        end
      end

      @always_install << newest.spec
    end

Looks up the latest specification for `dependency` and adds it to the always_install list.

add_local (dep_name, spec, source)
Source

    # File lib/rubygems/resolver/installer_set.rb, line 106
    def add_local(dep_name, spec, source)
      @local[dep_name] = [spec, source]
    end

Adds a local gem requested using `dep_name` with the given `spec` that can be loaded and installed using the `source`.

errors ()
Source

    # File lib/rubygems/resolver/installer_set.rb, line 127
    def errors
      @errors + @remote_set.errors
    end

Errors encountered while resolving gems

find_all (req)
Source

    # File lib/rubygems/resolver/installer_set.rb, line 135
    def find_all(req)
      res = []

      dep = req.dependency

      return res if @ignore_dependencies &&
                    @always_install.none? {|spec| dep.match? spec }

      name = dep.name

      dep.matching_specs.each do |gemspec|
        next if @always_install.any? {|spec| spec.name == gemspec.name }

        res << Gem::Resolver::InstalledSpecification.new(self, gemspec)
      end unless @ignore_installed

      matching_local = []

      if consider_local?
        matching_local = @local.values.select do |spec, _|
          req.match? spec
        end.map do |spec, source|
          Gem::Resolver::LocalSpecification.new self, spec, source
        end

        res.concat matching_local

        begin
          if local_spec = @local_source.find_gem(name, dep.requirement)
            res << Gem::Resolver::IndexSpecification.new(
              self, local_spec.name, local_spec.version,
              @local_source, local_spec.platform
            )
          end
        rescue Gem::Package::FormatError
          # ignore
        end
      end

      res.concat @remote_set.find_all req if consider_remote? && matching_local.empty?

      res
    end

Returns an array of IndexSpecification objects matching DependencyRequest `req`.

prefetch (reqs)
Source

    # File lib/rubygems/resolver/installer_set.rb, line 179
    def prefetch(reqs)
      @remote_set.prefetch(reqs) if consider_remote?
    end

prerelease= (allow_prerelease)
Source

    # File lib/rubygems/resolver/installer_set.rb, line 183
    def prerelease=(allow_prerelease)
      super

      @remote_set.prerelease = allow_prerelease
    end

Calls superclass method

### Private Instance Methods

metadata_satisfied? (spec)
Source

    # File lib/rubygems/resolver/installer_set.rb, line 246
    def metadata_satisfied?(spec)
      spec.required_ruby_version.satisfied_by?(Gem.ruby_version) &&
        spec.required_rubygems_version.satisfied_by?(Gem.rubygems_version)
    end