play_framework_jpa_plugin.rb

# Encoding: utf-8
# Cloud Foundry Java Buildpack
# Copyright 2013 the original author or authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

require 'java_buildpack/component/versioned_dependency_component'
require 'java_buildpack/framework'
require 'java_buildpack/util/play/factory'

module JavaBuildpack
  module Framework

    # Encapsulates the detect, compile, and release functionality for enabling cloud auto-reconfiguration in Play
    # applications that use JPA. Note that Spring auto-reconfiguration is covered by the SpringAutoReconfiguration
    # framework. The reconfiguration performed here is to override Play application configuration to bind a Play
    # application to cloud resources.
    class PlayFrameworkJPAPlugin < JavaBuildpack::Component::VersionedDependencyComponent

      # (see JavaBuildpack::Component::BaseComponent#compile)
      def compile
        download_jar
        @droplet.additional_libraries << (@droplet.sandbox + jar_name)
      end

      # (see JavaBuildpack::Component::BaseComponent#release)
      def release
        @droplet.additional_libraries << (@droplet.sandbox + jar_name)
      end

      protected

      # (see JavaBuildpack::Component::VersionedDependencyComponent#supports?)
      def supports?
        candidate = false

        play_app  = JavaBuildpack::Util::Play::Factory.create @droplet
        candidate = uses_jpa?(play_app) || play20?(play_app.version) if play_app

        @configuration['enabled'] && candidate
      end

      private

      def play20?(version)
        version.start_with? '2.0'
      end

      def uses_jpa?(play_app)
        play_app.jar?(/.*play-java-jpa.*\.jar/)
      end

    end

  end
end