Usage

This page shows some sample usage of ODataJClient, either at high (e.g. Proxy) and low (e.g. Engine) level.

Proxy samples

Get Entity

        DemoService demoService = null; // an instance of DemoService is provided by the context

        // Take the product with key value 3
        Product product3 = demoService.getProducts().get(3);

Create Entities

        DemoService demoService = null; // an instance of DemoService is provided by the context

        // create Category (local)
        Category category = new Category();
        category.setName("a category name");        
        category = demoService.getCategories().save(category);
        
        // create Product (local)
        Product product = new Product();
        product.setName("a name");
        product.setDescription("a description");
        product.setPrice(11F);
        product.setReleaseDate(new Date());        
        product = demoService.getProducts().save(product);
        
        // link product and category
        product.setCategory(category);
        category.setProducts(Collections.singletonList(product));
        
        // any flush() will generate actual operations on the OData service
        demoService.getProducts().flush();

Invoke Operation

        DemoService demoService = null; // an instance of DemoService is provided by the context

        // invoke GetProductsByRating
        Collection<Product> products = demoService.getProductsByRating(15);

Entity Query

        DemoService demoService = null; // an instance of DemoService is provided by the context

        // Typed query for products with price < 10.00
        EntityQuery<Product> productQuery = demoService.getProducts().createQuery(Product.class);
        productQuery.setFilter("Price lt 10.00");

        List<Product> matchingProducts = productQuery.getResultList();

        // ... do something with matchingProducts

        // Typed query for categories of products with price < 10.00
        EntityQuery<Category> categoryQuery = demoService.getProducts().createQuery(Category.class);
        productQuery.setFilter("Price lt 10.00");
        productQuery.setSelect("Category");

        List<Category> matchingCategories = categoryQuery.getResultList();
        
        // ... do something with matchingCategories

Untyped Query

        DemoService demoService = null; // an instance of DemoService is provided by the context

        // Untyped query for names of products with price < 10.00
        Query query = demoService.getProducts().createQuery();
        query.setFilter("Price lt 10.00");
        query.setSelect("Name");

        List<? extends Serializable> match = query.getResultList();

        // ... do something with match

Engine samples

Create entity

        // provide the target URI
        final ODataURI targetURI = new ODataURI("http://services.odata.org/OData/Odata.svc");
        targetURI.append("Products");

        // build the new object
        final ODataEntity newEntity = EntityFactory.newEntity("Java Code");
        newEntity.setSummary("OData client Java framework");
        // entity.set......

        // create your request
        final ODataRequest request = ODataRequestFactory.getCreateRequest(targetURI, newEntity);

        // execute the request
        ODataResponse res = client.execute(request);

        // retrieve and process execution results
        int statusCode = res.getStatusCode();
        String statusMessage = res.getStatusMessage();

Create link

        // provide the source URI
        final ODataURI sourceURI = new ODataURI("http://services.odata.org/OData/Odata.svc");
        sourceURI.append("Products(1)");

        // provide the target URI
        final ODataURI targetURI = new ODataURI("http://services.odata.org/OData/Odata.svc");
        targetURI.append("Suppliers(5)");

        // build the new link
        final ODataLink newLink = EntityFactory.newLink("Supplier", targetURI);

        // create your request
        final ODataRequest request = ODataRequestFactory.getCreateRequest(sourceURI, newLink);

        // execute the request
        ODataResponse res = client.execute(request);

        // retrieve and process execution results
        int statusCode = res.getStatusCode();
        String statusMessage = res.getStatusMessage();

Update entity (PATCH)

        // provide the target URI
        final ODataURI targetURI = new ODataURI("http://services.odata.org/OData/Odata.svc");
        targetURI.append("Products(2)");

        // build the new object to change Rating value
        final ODataEntity changes = EntityFactory.newEntity("Java Code");
        ODataProperty rating = new ODataProperty("Rating", "3");

        // create your request
        final ODataRequest request = ODataRequestFactory.getUpdateRequest(targetURI, changes, UpdateType.PATCH);

        // execute the request
        ODataResponse res = client.execute(request);

        // retrieve and process execution results
        int statusCode = res.getStatusCode();
        String statusMessage = res.getStatusMessage();

Delete entity

        // provide the target URI
        final ODataURI targetURI = new ODataURI("http://services.odata.org/OData/Odata.svc");
        targetURI.append("Products(2)");

        // create your request
        final ODataRequest request = ODataRequestFactory.getDeleteRequest(targetURI);

        // execute the request
        ODataResponse res = client.execute(request);

        // retrieve and process execution results
        int statusCode = res.getStatusCode();
        String statusMessage = res.getStatusMessage();

Query

        // prepare URI
        final ODataURI uri = new ODataURI("http://services.odata.org/OData/Odata.svc");
        uri.append("Products(0)").expand("Supplier").select("Rating,Supplier/Name");

        // create new request
        final ODataRequest request = ODataRequestFactory.getQueryRequest(uri);

        // execute request
        final ODataResponse res = client.execute(request);

        // retrieve and process the query result
        for (ODataEntity entity : (Iterable<ODataEntity>) res.getBody()) {
            // .................
        }