Poorman's dynamic finder: findAllWhere(....)

A finder impl to DaoImpls that can handle majority of findAllWhere(conditions...) that is similar but more flexible than query by example that can handle:

/**

• Generic method to get a list of objects based on class and constraints as a Map of:
• <ul>
• <li>HQL property path expression 1 as String -> null | Object | Object[] | Collection
• <li>HQL property path expression 2 as String -> null | Object | Object[] | Collection
• <li>...
• </ul>
• Note that:
• <ul>
• <li>Each Map entry translate to a predicate that must be satisfied, i.e. all entries are to be 'AND'd together
• <li>if entry.value is null, the HQL criteria translates to isNull
• <li>if entry.value is Object, the HQL criteria translates to isEqualTo
• <li>if entry.value is Object[] or Collection, the HQL criteria translates to isOneOf
• <li>if entry.key starts with "!", the HQL criteria translates to isNot
• <li>if entry.key ends with "~", the HQL criteria translates to isLike
• <li>if entry.key ends with ">", the HQL criteria translates to isGreaterThan
• <li>if entry.key ends with ">=", the HQL criteria translates to isGreaterThanOrEqualTo
• <li>if entry.key ends with "<", the HQL criteria translates to isLessThan
• <li>if entry.key ends with "<=", the HQL criteria translates to isLessThanOrEqualTo
• </ul>
• Example: find all Users whose first name is Brian, last name starts with G, and age between 30 and 40
• find(User.class, { "firstName":"Brian", "lastName~":"G%", "age>=":30, "age<":40 }

  )

• @param clazz model class to lookup
• @param Map specifying the constraints
• @return List of populated object satisfying constraints
• @see org.springframework.orm.ObjectRetrievalFailureException
  */
  public List<T> find(Map<String,Object> constraints);

/**

• Extending find(Class,Map) to handle Several Constraint Sets, only one ConstraintSet need to match
• i.e. Disjunctive Normal Form
• @param clazz
• @param constraintSets
• @return List of populated object satisfying at least one of the constraintSets
  */
  public List<T> find(Map<String,Object>[] constraintSets);