Improve `TypeFactory.constructFromCanonical()` to work with `java.lang.reflect.Type.getTypeName()' format

[luiscleto]

Java's Type#getTypeName() for parameterized types with multiple type parameters returns the inner types in a comma and space separated list. (e.g. "java.util.Map<java.lang.Integer, java.lang.Double>").

Attempting to construct the type using TypeFactory's constructFromCanonical will result in an exception as the inner tokens are not trimmed (although the top level String is). For the example above it would be

java.lang.IllegalArgumentException: Failed to parse type 'java.util.Map<java.lang.Integer, java.lang.Double>' (remaining: '>'): Can not locate class ' java.lang.Double', problem:  java.lang.Double
	at com.fasterxml.jackson.databind.type.TypeParser._problem(TypeParser.java:87)
	at com.fasterxml.jackson.databind.type.TypeParser.findClass(TypeParser.java:81)
	at com.fasterxml.jackson.databind.type.TypeParser.parseType(TypeParser.java:44)
	at com.fasterxml.jackson.databind.type.TypeParser.parseTypes(TypeParser.java:62)
	at com.fasterxml.jackson.databind.type.TypeParser.parseType(TypeParser.java:49)
	at com.fasterxml.jackson.databind.type.TypeParser.parse(TypeParser.java:30)
	at com.fasterxml.jackson.databind.type.TypeFactory.constructFromCanonical(TypeFactory.java:236)

Since using Jackson's own JavaTypes to obtain the canonical form does not yield inner spaces, no error will occur for that scenario, hence I see this as a feature I'd like to have rather than a bug. This could be easily achieved if findClass trimmed the String it receives (or received an already trimmed token).

[luiscleto]

Replicating the above issue:

        objects = new TreeMap<Object, Object>() { };
        t = tf.constructType(java.util.TreeMap.class);
        reflectTypeName = objects.getClass().getGenericSuperclass().getTypeName();
        System.out.println(reflectTypeName);
        // This will throw an Exception if you don't remove all white spaces from the String.
        System.out.println(t.equals(tf.constructFromCanonical(reflectTypeName)));

[cowtowncoder]

Sounds reasonable enough improvement.

[luiscleto]

Awesome! Thanks for the quick work on this :)