# 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'

require 'pathname'

module JavaBuildpack

# An abstraction around the user's application. This is intended to hide the exact structure of the +app_dir+ from

# components. Instead, components should use this abstraction to examine the bits of the filesystem that are specific

# to it, and the application itself.

class Application

# Creates an instance of the application abstraction.

def initialize(app_dir)

@root = Pathname.new(app_dir)

@initial_contents = []

@root.find { |pathname| @initial_contents << pathname }

end

# Returns a child with the specified relative path

#

# @param [String] relative_path the path to the child, relative to the application

# @return [Pathname] the path to the child

def child(relative_path)

child = @root + relative_path

child if @initial_contents.include?(child) || !child.exist?

end

# Returns the children of the application (files and subdirectories, not recursive) as an array of +Pathname+

# objects. Does not include any files created by other components.

#

# @return [Array<Pathname>] the children of the application

# @see Pathname

def children

@root.children & @initial_contents

end

# Returns the path to a directory that can be used by the component. The

# return value of this method should be considered opaque and subject to

# change.

#

# @param [String] identifier an identifier for the component

# @return [Pathname] the path to the directory

def component_directory(identifier)

@root + ".#{identifier.downcase}"

end

# Returns a path relative to the application root

#

# @param [Pathname] other the other path

# @return [Patname] the relative path

def relative_path_to(other)

other.relative_path_from(@root)

end

end

end