# Package org.apache.olingo.odata2.api

OData Library API OData Library is a protocol implementation of the OData V2.0 standard.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  ODataCallback | Common OData callback interface.
  ODataDebugCallback |
  ODataDebugResponseWrapperCallback | Debug handler.
  ODataService | Root interface for a custom OData service.

- Class Summary
  Class | Description
  --- | ---
  ODataServiceFactory | Creates instance of custom OData service.
  ODataServiceVersion | This class is a container for the supported ODataServiceVersions.

## Package org.apache.olingo.odata2.api Description

OData Library API

OData Library is a protocol implementation of the OData V2.0 standard. For details of this standard see odata.org.

This API is intended to implement an OData service. An OData service consists of a metadata provider implementation and an OData processor implementation.

An OData service can be exposed by a web application. For the runntime one JAX-RS implementation is needed and the core implementation library of this API. Apache CXF for example is one such JAX-RS implementation.

Entry point to the service is a JAX-RS servlet. At this servlet init parameters for a `ODataServiceFactory` is configured. The parameter `javax.ws.rs.Application` is a default by JAX-RS and has to be present always.

     <?xml version="1.0" encoding="UTF-8"?>
     <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
       xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
       id="WebApp_ID" version="2.5">
       <display-name>Example OData Service</display-name>
       <servlet>
         <servlet-name>MyODataServlet</servlet-name>
         <servlet-class>org.apache.cxf.jaxrs.servlet.CXFNonSpringJaxrsServlet</servlet-class>
         <init-param>
          <param-name>javax.ws.rs.Application</param-name>
          <param-value>org.apache.olingo.odata2.core.rest.app.ODataApplication</param-value>
         </init-param>
         <init-param>
           <param-name>org.apache.olingo.odata2.service.factory</param-name>
           <param-value>com.sample.service.MyServiceFactory</param-value>
         </init-param>
         <load-on-startup>1</load-on-startup>
       </servlet>
       <servlet-mapping>
         <servlet-name>MyODataServlet</servlet-name>
         <url-pattern>/MyService.svc/*</url-pattern>
       </servlet-mapping>
     </web-app>

This factory produces the service, a metadata provider and the data processor. The provider, typically a derivative of the class `EdmProvider` provides the metadata of the service. The processor implements a variety of service interfaces, and provides the data of the service. The processor is typically a derivative of the class `ODataSingleProcessor` which can be used together with the class `ODataSingleService`.

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