Class: VirtualAssembly::Semantizer::HashSerializer

Inherits:
Object
  • Object
show all
Defined in:
lib/virtual_assembly/semantizer/hash_serializer.rb

Overview

The HashSerializer turns all the semantic properties of a SemanticObject into a Hash.

Lets consider the following SemanticObject with a single semantic property like:

The HashSerializer will return the following Hash: href="http://xmlns.com/foaf/0.1/name">xmlns.com/foaf/0.1/name” => “John”.

Instance Method Summary collapse

Constructor Details

#initialize(inputContext = nil) ⇒ HashSerializer

The inputContext must be a hash like { prefix => uri }



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# File 'lib/virtual_assembly/semantizer/hash_serializer.rb', line 29

def initialize(inputContext = nil)
    @inputContext = inputContext
end

Instance Method Details

#process(subject) ⇒ Object

This is the main method to begin the serialization.

The subject should be a SemanticObject.



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# File 'lib/virtual_assembly/semantizer/hash_serializer.rb', line 36

def process(subject)
    result = {}

    # We iterate over all the semantic properties of the subject.
    subject.semanticProperties.each do |property|
        name = @inputContext? self.prefixName(property.name): property.name
        value = property.value

        if (value == nil)
            next
        end

        # In case the property is a primitive, we simply get its value.
        if ([ String, Integer, Float, TrueClass, FalseClass ].include?(value.class))
            result[name] = value

        # In case the property is a SemanticObject, we get its semanticId 
        # or we process it if it is a blank node.
        elsif (value.class < VirtualAssembly::Semantizer::SemanticObject)
            if (value.isBlankNode?)
                result[name] = process(value)
            else
                result[name] = value.semanticId
            end

        # In case the property is an Array, we export each item.
        elsif (value.class == Array)
            if (!value.empty?)
                result[name] = exportCollection(value)
            end

        else 
            raise "The type of the property '" + name + "' is '" + value.class.to_s + "' but a primitive, a SemanticObject or an Array is required."
        end
    end
 
    return result;
end