Class: Fontist::Indexes::DirectoryChange

Inherits:
Object
  • Object
show all
Defined in:
lib/fontist/indexes/directory_change.rb

Overview

Value object representing a single change detected in a directory Immutable - describes what changed between two snapshots

Constant Summary collapse

ADDED =

Change types

:added
MODIFIED = 
:modified
REMOVED = 
:removed
UNCHANGED = 
:unchanged

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(change_type, filename, old_info, new_info) ⇒ DirectoryChange

Instance methods



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# File 'lib/fontist/indexes/directory_change.rb', line 76

def initialize(change_type, filename, old_info, new_info)
  @change_type = change_type
  @filename = filename
  @old_info = old_info
  @new_info = new_info
  freeze # Immutable
end

Instance Attribute Details

#change_type ⇒ Object (readonly)

Returns the value of attribute change_type.



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# File 'lib/fontist/indexes/directory_change.rb', line 6

def change_type
  @change_type
end

#filename ⇒ Object (readonly)

Returns the value of attribute filename.



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# File 'lib/fontist/indexes/directory_change.rb', line 6

def filename
  @filename
end

#new_info ⇒ Object (readonly)

Returns the value of attribute new_info.



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# File 'lib/fontist/indexes/directory_change.rb', line 6

def new_info
  @new_info
end

#old_info ⇒ Object (readonly)

Returns the value of attribute old_info.



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# File 'lib/fontist/indexes/directory_change.rb', line 6

def old_info
  @old_info
end

Class Method Details

.added(filename, new_info) ⇒ Object

Create an added file change



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# File 'lib/fontist/indexes/directory_change.rb', line 17

def added(filename, new_info)
  new(ADDED, filename, nil, new_info)
end

.diff(old_snapshot, new_snapshot) ⇒ Object

Compare two snapshots and detect changes Returns: Array of DirectoryChange objects



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# File 'lib/fontist/indexes/directory_change.rb', line 38

def diff(old_snapshot, new_snapshot)
  changes = []

  # Check for added and modified files
  new_snapshot.files.each do |new_file|
    filename = new_file[:filename]
    old_file = old_snapshot.file_info(filename)

    if old_file.nil?
      changes << added(filename, new_file)
    elsif file_modified?(old_file, new_file)
      changes << modified(filename, old_file, new_file)
    end
  end

  # Check for removed files
  old_snapshot.files.each do |old_file|
    filename = old_file[:filename]

    unless new_snapshot.has_file?(filename)
      changes << removed(filename, old_file)
    end
  end

  changes
end

.modified(filename, old_info, new_info) ⇒ Object

Create a modified file change



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# File 'lib/fontist/indexes/directory_change.rb', line 22

def modified(filename, old_info, new_info)
  new(MODIFIED, filename, old_info, new_info)
end

.removed(filename, old_info) ⇒ Object

Create a removed file change



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# File 'lib/fontist/indexes/directory_change.rb', line 27

def removed(filename, old_info)
  new(REMOVED, filename, old_info, nil)
end

.unchanged(filename, info) ⇒ Object

Create an unchanged file change



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# File 'lib/fontist/indexes/directory_change.rb', line 32

def unchanged(filename, info)
  new(UNCHANGED, filename, info, info)
end

Instance Method Details

#added? ⇒ Boolean

Query methods for change type

Returns:

  • (Boolean) 


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# File 'lib/fontist/indexes/directory_change.rb', line 85

def added?
  @change_type == ADDED
end

#modified? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fontist/indexes/directory_change.rb', line 89

def modified?
  @change_type == MODIFIED
end

#removed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fontist/indexes/directory_change.rb', line 93

def removed?
  @change_type == REMOVED
end

#to_h ⇒ Object

Convert to hash for serialization



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# File 'lib/fontist/indexes/directory_change.rb', line 102

def to_h
  {
    change_type: @change_type,
    filename: @filename,
    old_info: @old_info,
    new_info: @new_info,
  }
end

#unchanged? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fontist/indexes/directory_change.rb', line 97

def unchanged?
  @change_type == UNCHANGED
end