Add attributes system.

data/plugins/entity/attributes/attributes.rb

@@ -0,0 +1,67 @@
+require 'java'
+
+java_import 'org.apollo.game.model.Entity'
+
+# Maps attribute names (i.e. symbols) to attribute definitions.
+ATTRIBUTE_DEFINITIONS = {}
+
+class Entity
+
+  # The map of strings to attributes.
+  def attributes
+    @attributes ||= {}
+  end
+  
+  # Overridies method_missing
+  def method_missing(symbol, *args)
+    name = symbol.to_s.strip
+
+    if name[-1] == "="
+      raise "Error - expected argument count of 1, received #{args.length}" unless args.length == 1
+      
+      name = name[0...-1].strip # Drop the equals and preceeding whitespace
+      attributes[name] = args[0]
+    elsif ATTRIBUTE_DEFINITIONS[name] == nil
+      super(symbol, *args)
+    else
+      return attributes[name] || ATTRIBUTE_DEFINITIONS[name].default
+    end
+  end
+
+  def to_s
+    return value.to_s
+  end
+
+end
+
+# An attribute belonging to an entity.
+class AttributeDefinition
+  attr_reader :default, :persistence
+
+  def initialize(default, persistence=:transient)
+    @default = default
+    @type = get_type
+    @persistence = persistence
+  end
+
+  def to_s
+    return "[AttributeDefinition - default=#{default}, type=#{type}, persistence=#{persistence}]."
+  end
+
+  private # Gets the type of an attribute from its default value.
+  def get_type
+    case @default
+      when Fixnum, Integer then type = :number
+      when String then type = :string
+      when Symbol then type = :symbol
+      when TrueClass, FalseClass then type = :boolean
+      else raise "Error - #{value} has an unrecognised attribute type of #{value.class}."
+    end
+  end
+
+end
+
+# Declares an attribute which can then be assigned.
+def declare_attribute(name, default, persistence=:transient)
+  ATTRIBUTE_DEFINITIONS[name.to_s] = AttributeDefinition.new(default, persistence)
+end

data/plugins/entity/attributes/plugin.xml

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+<?xml version="1.0"?>
+<plugin>
+  <id>attributes</id>
+  <version>0.9</version>
+  <name>Attributes</name>
+  <description>Adds an attribute system for entites.</description>
+  <authors>
+    <author>Major</author>
+  </authors>
+  <scripts>
+    <script>attributes.rb</script>
+  </scripts>
+  <dependencies />
+</plugin>