Last change
on this file since 30903 was 30903, checked in by davidb, 8 years ago |
Vagrant provisioning files for a 4-node Hadoop cluster. See README.txt for more details
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File size:
1.1 KB
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[30903] | 1 | module Puppet::Parser::Functions
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| 2 | newfunction(:merge, :type => :rvalue, :doc => <<-'ENDHEREDOC') do |args|
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| 3 | Merges two or more hashes together and returns the resulting hash.
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| 4 |
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| 5 | For example:
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| 6 |
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| 7 | $hash1 = {'one' => 1, 'two', => 2}
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| 8 | $hash2 = {'two' => 'dos', 'three', => 'tres'}
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| 9 | $merged_hash = merge($hash1, $hash2)
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| 10 | # The resulting hash is equivalent to:
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| 11 | # $merged_hash = {'one' => 1, 'two' => 'dos', 'three' => 'tres'}
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| 12 |
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| 13 | When there is a duplicate key, the key in the rightmost hash will "win."
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| 14 |
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| 15 | ENDHEREDOC
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| 16 |
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| 17 | if args.length < 2
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| 18 | raise Puppet::ParseError, ("merge(): wrong number of arguments (#{args.length}; must be at least 2)")
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| 19 | end
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| 20 |
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| 21 | # The hash we accumulate into
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| 22 | accumulator = Hash.new
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| 23 | # Merge into the accumulator hash
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| 24 | args.each do |arg|
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| 25 | next if arg.is_a? String and arg.empty? # empty string is synonym for puppet's undef
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| 26 | unless arg.is_a?(Hash)
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| 27 | raise Puppet::ParseError, "merge: unexpected argument type #{arg.class}, only expects hash arguments"
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| 28 | end
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| 29 | accumulator.merge!(arg)
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| 30 | end
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| 31 | # Return the fully merged hash
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| 32 | accumulator
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| 33 | end
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| 34 | end
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