# Encoding: utf-8

# Cloud Foundry Java Buildpack

# Copyright 2013-2015 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/util'

module JavaBuildpack

module Util

# Passes the open file descriptor for each candidate file to the given block. If opening or reading the file causes

# an error, iteration will continue, and the failing element will be assumed to have returned +true+ (i.e. failure

# will not affect the net result of the successful elements).

#

# @param [Array<Pathname>] candidates the candidate files to iterate

# @return [Boolean] +true+ if the block never returns +false+ or +nil+, otherwise +false+.

def all?(candidates, &block)

candidates.all? { |candidate| open(true, candidate, &block) }

end

# Passes the open file descriptor for each candidate file to the given block. If opening or reading the file causes

# an error, iteration will continue, and the failing element will be assumed to have returned +false+ (i.e. failure

# will not affect the net result of the successful elements).

#

# @param [Array<Pathname>] candidates the candidate files to iterate

# @return [Boolean] +true+ if the block always returns +false+ or +nil+, otherwise +false+.

def none?(candidates, &block)

candidates.none? { |candidate| open(false, candidate, &block) }

end

# Passes the open file descriptor for each candidate file to the given block. If opening or reading the file causes

# an error, iteration will continue, and the failing element will be assumed to have returned +true+ (i.e. failure

# will not affect the net result of the successful elements).

#

# @param [Array<Pathname>] candidates the candidate files to iterate

# @return [Array<Pathname>] the candidates for which the block returned +false+ or +nil+

def reject(candidates, &block)

candidates.reject { |candidate| open(true, candidate, &block) }

end

# Passes the open file descriptor for each candidate file to the given block. If opening or reading the file causes

# an error, iteration will continue, and the failing element will be assumed to have returned +false+ (i.e. failure

# will not affect the net result of the successful elements).

#

# @param [Array<Pathname>] candidates the candidate files to iterate

# @return [Array<Pathname>] the candidates for which the block returned +true+

def select(candidates, &block)

candidates.select { |candidate| open(false, candidate, &block) }

end

private

def open(default, candidate, &block)

candidate.open('r', external_encoding: 'UTF-8', &block)

rescue => e

@logger.warn e.message

default

end

end

end