# 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 'pathname'

require 'java_buildpack/util'

module JavaBuildpack

module Util

# A base class for utilities that need to find a JAR file

class JarFinder

# Creates a new instance

#

# @param [RegExp] pattern the pattern to use when filtering JAR files

def initialize(pattern)

@pattern = pattern

end

# Indicates whether an application has a JAR file

#

# @param [Application] application the application to search

# @return [Boolean] +true+ if the application has a JAR file, +false+ otherwise

def is?(application)

jar application

end

# The version of of the JAR file used by the application

#

# @param [Application] application the application to search

# @return [String] the version of the JAR file used by the application

def version(application)

jar(application).to_s.match(@pattern)[1]

end

private

def jar(application)

(application.root + '**/lib/*.jar').glob.find { |jar| jar.to_s =~ @pattern }

end

end

end

end