Have you ever stumbled across the term wrapper, but don't really know what it's all about? Or are you interested in this term and would like more information about it? Then you've come to the right place because we'll answer these questions in detail.
A wrapper is software that embeds one or more software elements in the sense of an "interface". This happens, for example, with individual components or complete products, but can also affect the architecture of the software, a software environment, or a framework. The term wrapper comes from the field of software engineering and stands for various work steps in relation to software. To wrap means something like wrapping in English. There is also a design pattern in the object-oriented environment that is known not only as a wrapper but also sometimes as an adapter pattern.
There is a specific problem that needs to be solved regarding the wrapper. Namely, inconsistencies that can be found between various interfaces of different software must be recognized and bridged. When these interact, problems often arise. A uniform interface must be developed to prevent this and bridge possible inconsistencies. The software itself and its elements may not be edited.
So that you can better understand what types and classes of wrappers there are, we will explain the possibilities using various practical examples.
At its simplest, you can think of a wrapper as an adapter. It connects two systems that would not be compatible without it. The wrapper first looks at the data that is in the relevant interface and accesses it. He then converts them into the required form and passes the data to the targeted system. The reverse is also possible. In practical terms, there is often a problem to be solved by connecting different system structures. This can be seen, for example, in wrapper architecture. There, data sources, whether not relational or relational, file servers, application systems, or database systems must be connected to an SQL server using a wrapper. The wrapper provides a standard interface for this,
This also includes the so-called JDBC or Java Database Connectivity. It designates a set of interfaces so that Java relational database systems can be used. You can also see the Wrapper Framework as a framework with which wrappers can be built, which are used to be able to use uniform functional interfaces for the existing client applications. These are then encapsulated both professionally and technically.
There is also a security wrapper that is intended to monitor application systems over the long term. Such a wrapper should observe the behavior at the interfaces of certain components. He is then supposed to perform a balance with a certain security policy of the entire system. In Java, there is also a wrapper class. These generally allow the transfer of primitive data types in strings. This is also possible the other way around, namely back from strings to primitive data types. Furthermore, wrapper objects are intended to encapsulate a simple primitive data type into an object.
The idea behind a wrapper design pattern, or alternatively an adapter pattern, is that different interfaces should be adapted to each other so that they can then be used by a client. The Wrapper pattern allows classes to cooperate that would otherwise be incompatible and prevent them from working together.
Probably you now know that wrappers can solve certain problems. You recognize inconsistencies between various interfaces of different software and ensure that they are bridged. The software with the individual elements must not be revised, but remains unaffected. There are also different types and classes of wrappers, which we have described to you using various examples. Wrappers are therefore intended to adapt different interfaces to each other that would not work together without it because they would be incompatible without it.