Search criteria are expressed as a tree of search-terms,
forming a parse-tree for the search expression.
Search-terms are represented by this class. This is an abstract class;
subclasses implement specific match methods.
Search terms are serializable, which allows storing a search term between
sessions. Warning: Serialized objects of this class may not be compatible
with future JavaMail API releases. The current serialization support is
appropriate for short term storage.
Warning: Search terms that include references to objects of type
Message.RecipientType will not be deserialized correctly on JDK 1.1
systems. While these objects will be deserialized without throwing any
exceptions, the resulting objects violate the type-safe enum contract of
the Message.RecipientType class. Proper deserialization of these objects
depends on support for the readReplace method, added in JDK 1.2.
This method applies a specific match criterion to the given message and
returns the result.