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require File.dirname(__FILE__) + "/../spec_helper"
describe 'java.lang.Iterable' do
# java.nio.file.Path extends Iterable<Path>
it 'iterates using #each' do
file_system = java.nio.file.FileSystems.getDefault
path = file_system.getPath(__FILE__)
paths = []
ret = path.each { |p| paths << p.to_s }
expect( paths ).to_not be_empty
expect( paths.last ).to eq 'iterable_spec.rb'
expect( ret ).to be path
end
it 'iterates with an Enumerator on #each' do
file_system = java.nio.file.FileSystems.getDefault
path = file_system.getPath(__FILE__)
enum = path.each
expect( enum.next ).to_not be nil
end
it 'iterates using #each_with_index' do
file_system = java.nio.file.FileSystems.getDefault
path = file_system.getPath(__FILE__)
paths = []
ret = path.each_with_index { |p| paths << p }
expect( paths ).to_not be_empty
expect( paths[-1][0].to_s ).to eq 'iterable_spec.rb'
expect( paths[-1][1] ).to eq paths.size - 1
expect( ret ).to eql path
paths = []; idxs = []
ret = path.each_with_index { |p, i| paths << p; idxs << i }
expect( paths ).to_not be_empty
expect( paths[-1].to_s ).to eq 'iterable_spec.rb'
expect( idxs[0] ).to eq 0
expect( idxs[-1] ).to eq paths.size - 1
expect( ret ).to be path
end
it 'iterates with an Enumerator on #each_with_index' do
file_system = java.nio.file.FileSystems.getDefault
path = file_system.getPath(__FILE__)
enum = path.each_with_index
n = enum.next
expect( n[0] ).to_not be nil
expect( n[1] ).to eql 0
end
it 'does #map' do
file_system = java.nio.file.FileSystems.getDefault
path = file_system.getPath(__FILE__)
paths = path.map { |p| p.to_s.upcase }
expect( paths ).to_not be_empty
expect( paths.last ).to eq 'ITERABLE_SPEC.RB'
end
it 'converts #to_a' do
file_system = java.nio.file.FileSystems.getDefault
path = file_system.getPath(__FILE__)
expect( path.to_a ).to_not be_empty
expect( path.to_a ).to eql iterate_path(path)
end
it 'counts' do
file_system = java.nio.file.FileSystems.getDefault
path = file_system.getPath(__FILE__)
expect( path.count ).to eq iterate_path(path).size
expect( path.count { |p| p.to_s == 'iterable_spec.rb' } ).to eq 1
a_path = iterate_path(path).last
path = file_system.getPath(__FILE__)
expect( path.count(nil) ).to eq 0
expect( path.count(a_path) ).to eq 1
end
it 'converts #to_a' do
file_system = java.nio.file.FileSystems.getDefault
path = file_system.getPath(__FILE__)
expect( path.to_a ).to_not be_empty
expect( path.to_a ).to eql iterate_path(path)
end
private
def iterate_path(path)
res = [] ; it = path.iterator
while it.hasNext ; res << it.next end
res
end
describe 'Ruby class' do
class RubyIterableWrapper
include java.lang.Iterable
def initialize(coll) @coll = coll end
def iterator; @coll.iterator end
end
it 'iterates as an Enumerable' do
wrapper = RubyIterableWrapper.new coll = java.util.ArrayList.new([1, 2, 3])
elems = [] ; wrapper.map { |el| elems << el + 1 }
expect( elems ).to eql [2, 3, 4]
expect( wrapper.to_a ).to eql [1, 2, 3]
elems = [] ; wrapper.each_with_index { |el, i| elems << [el, i] }
expect( elems ).to eql [[1, 0], [2, 1], [3, 2]]
end
end
end
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