Module: ExistDB::Dom::Mapper::ClassMethods

Defined in:
lib/existdb/dom/mapper.rb

Instance Method Summary collapse

Instance Method Details

#attribute(name, type = String, options = {}) ⇒ Object 



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# File 'lib/existdb/dom/mapper.rb', line 45

def attribute(name, type = String, options = {})
    a = Attribute.new(name, type, options)
    @attributes ||= Hash.new
    @attributes[a.tag] = a
    self.class_eval %{
        def #{a.method_name}
            get_attribute(#{a.tag.inspect})
        end
        
        def #{a.method_name}=(value)
            set_attribute(#{a.tag.inspect}, value)
        end
    }
end

#attributes ⇒ Object 



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# File 'lib/existdb/dom/mapper.rb', line 60

def attributes
    @attributes.values
end

#element(name, type = String, options = {}, &block) ⇒ Object 



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# File 'lib/existdb/dom/mapper.rb', line 64

def element(name, type = String, options = {}, &block)
    e = Element.new(name, type, options)
    @elements ||= Hash.new
    @elements[e.tag] = e

    if (type.respond_to?(:is_dom_mapper?) and type.is_dom_mapper?) or block_given? then # Nested elements
        if block_given? then # Anonymous Mapper Class
            klass = self.class_eval %{
                @@#{e.method_name}_klass = Class.new do
                    include ExistDB::Dom::Mapper
                end
            }
            klass.instance_eval &block
        else
            self.class_eval %{
                @@#{e.method_name}_klass = #{type}
            }
        end
        self.class_eval %{
            def #{e.method_name}
                get_elements(#{e.tag.inspect}, @@#{e.method_name}_klass)
            end
        }
    else # No nested elements
        self.class_eval %{
            def #{e.method_name}
                get_element(#{e.tag.inspect})
            end
            
            def #{e.method_name}=(value)
                set_element(#{e.tag.inspect}, value)
            end
        }
    end
end

#elements ⇒ Object 



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# File 'lib/existdb/dom/mapper.rb', line 100

def elements
    @elements.values
end

#find(*options) ⇒ Object 



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# File 'lib/existdb/dom/mapper.rb', line 191

def find(*options)
    xql = XQLFactory::XQLFactory.new(*options)

    if xql.node_xpath.nil? then
        xql.node_xpath = "//#{tag_name}"
    end

    if xql.doc.is_a?(Resource::Xml) then
        xql.doc.xquery(xql.xquery).map{ |res| new(res) }
    elsif xql.doc.is_a?(ResourceSet) then
        xql.doc.join.xquery(xql.xquery).map{ |res| new(res) }
    elsif xql.doc.is_a?(String) and Embedded.instance.running?
        Embedded.instance.xquery_service.query(xql.xquery).map{ |res| new(res) }
    else
        nil
    end
end

#find_by_xquery(resource, query) ⇒ Object 



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# File 'lib/existdb/dom/mapper.rb', line 209

def find_by_xquery(resource, query)
    nodes = resource.xquery(query)
    nodes.map{ |node| new(node) }
end

#get_attribute(tag_name, dom) ⇒ Object 



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# File 'lib/existdb/dom/mapper.rb', line 121

def get_attribute(tag_name, dom)
    a = @attributes[tag_name]
    value = dom.getAttributes.getNamedItem(tag_name).getValue rescue nil
    a.type_cast( value )
end

#get_element(tag_name, dom) ⇒ Object 



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# File 'lib/existdb/dom/mapper.rb', line 104

def get_element(tag_name, dom)
    e = @elements[tag_name]
    child = getFirstChildByTagName(dom, tag_name)
    return e.type_cast( child.getNodeValue ) if child.respond_to?(:getNodeValue)
    return nil
end

#get_elements(tag_name, klass, dom) ⇒ Object 



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# File 'lib/existdb/dom/mapper.rb', line 111

def get_elements(tag_name, klass, dom)
    children = dom.getElementsByTagName(tag_name)
    size = children.getLength
    if size == 1 then
        klass.new(children.item(0))
    elsif size > 1 then
        0..size.map{ |i| klass.new(children.item(i)) }
    end
end

#is_dom_mapper? ⇒ Boolean

Returns:



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# File 'lib/existdb/dom/mapper.rb', line 214

def is_dom_mapper?
    true
end

#parse(resource, options = {}) ⇒ Object 



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# File 'lib/existdb/dom/mapper.rb', line 175

def parse(resource, options = {})

    if options[:single] then
        return new(resource)
    else
        xpath = options[:xpath]
        xpath ||= "//#{options[:tag]}" if options[:tag]
        xpath ||= "//#{options[:name]}" if options[:name]
        xpath ||= "//#{tag_name}"

        resource_set = resource.xquery(xpath)
        return resource_set.map{ |res| new(res) }
    end

end

#set_attribute(dom, tag_name, value) ⇒ Object 



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# File 'lib/existdb/dom/mapper.rb', line 151

def set_attribute(dom, tag_name, value)
    attr = dom.getAttributes.getNamedItem(tag_name)
    new_attr = org.exist.dom.AttrImpl.new(
        org.exist.dom.QName.new( tag_name.to_s.to_java_string ),
        value.to_s.to_java_string )
    ExistDB::Embedded.instance.transaction do |transaction|
        if attr then
            new_attr.setOwnerDocument( dom.getOwnerDocument )
            dom.updateChild(transaction, attr, new_attr)
        else
            dom.appendChild(new_attr)
        end
    end
    return value
end

#set_element(dom, tag_name, value) ⇒ Object 



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# File 'lib/existdb/dom/mapper.rb', line 127

def set_element(dom, tag_name, value)
    parent = dom
    node = getFirstChildByTagName(dom, tag_name)
    
    if node.nil? then
        doc = parent.getOwnerDocument
        node = doc.createElement( tag_name.to_s )
        parent.appendChild(node)
    end

    child = node.getChildNodes.select{ |child| 
        child.getNodeType == org.w3c.dom.Node.TEXT_NODE }.first
    text = org.exist.dom.TextImpl.new( value.to_s.to_java_string )
    if child then
        ExistDB::Embedded.instance.transaction do |transaction|
            text.setOwnerDocument( node.getOwnerDocument )
            node.updateChild(transaction, child, text)
        end
    else
        node.appendChild(text)
    end
    return value
end

#tag(new_tag_name) ⇒ Object 



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# File 'lib/existdb/dom/mapper.rb', line 167

def tag(new_tag_name)
    @tag_name = new_tag_name.to_s unless new_tag_name.nil? || new_tag_name.to_s.empty?
end

#tag_name ⇒ Object 



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# File 'lib/existdb/dom/mapper.rb', line 171

def tag_name
    @tag_name ||= to_s.split('::').last.downcase
end