It's very nice to know that you can access Java libraries from within a Ruby. For example I decided to do a little experiment to create a TreeModel to display the contents of the loaded XSD definition in a JTree.
Here's an initial (and incomplete) implementation of the model:
require "java"
include_class 'javax.swing.JTree'
include_class 'javax.swing.JFrame'
include_class 'javax.swing.JScrollPane'
include_class 'java.awt.BorderLayout'
include_class 'javax.swing.tree.TreeModel'
class XsdTreeModel
include TreeModel
attr_reader :schema
def initialize(s)
@schema = s
end
def getChild(a,i)
case a
when XSDInfo::SchemaInformation
return a.elements.values[i]
when XSDInfo::SchemaElement
return a.element_type
when XSDInfo::SchemaComplexType
return a.attributes.values[i]
end
end
def getChildCount(a)
case a
when XSDInfo::SchemaInformation
return a.elements.length
when XSDInfo::SchemaElement
return 1
when XSDInfo::SchemaComplexType
return a.attributes.length
else
return 0
end
end
def getIndexOfChild(a,h)
case a
when XSDInfo::SchemaInformation
return a.elements.values.index(h)
when XSDInfo::SchemaElement
return 0
when XSDInfo::SchemaComplexType
return a.attributes.index(h)
else
return -1
end
end
def getRoot()
return @schema
end
def isLeaf(o)
return false
end
# Interface methods without implementation
def addTreeModelListener(l)
end
def removeTreeModelListener(l)
end
def valueForPathChanged(arg0, arg1)
end
end
Now we can use it:
sc = XSDInfo::SchemaCollection.new
sc.add_schema XSDInfo::SchemaInformation.new("xhtml1-strict.xsd")
sc.namespaces.each {|ns| sc[ns].solve_references sc}
a_schema = sc[sc.namespaces[0]]
f = JFrame.new
f.setSize(300,300)
f.getContentPane.setLayout(BorderLayout.new)
tree = JTree.new
sp = JScrollPane.new(tree)
tree.setModel(XsdTreeModel.new(a_schema))
f.getContentPane.add(sp,BorderLayout::CENTER)
f.setVisible(true)
Running this program generates the desired tree:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi0bDw5hyphenhyphenSrDlxHfR9pOY586wFF-9L4e-8OQaHT352RgpJ061IIibWFbmpLdYymch05eAxMfNg-qcCke5xvzt1ehj9SyZx6bM-pzdNrMV7h_HUG5oAOHyQUvkzJyppxj-ztQjkEt4mmeErQ/s320/jrubyschemajtree.png)