Source Code Cross Referenced for ObjectProvider.java in  » Library » Tapestry » org » apache » tapestry » ioc » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Tapestry » org.apache.tapestry.ioc 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        // Copyright 2006, 2007 The Apache Software Foundation
02:        //
03:        // Licensed under the Apache License, Version 2.0 (the "License");
04:        // you may not use this file except in compliance with the License.
05:        // You may obtain a copy of the License at
06:        //
07:        //     http://www.apache.org/licenses/LICENSE-2.0
08:        //
09:        // Unless required by applicable law or agreed to in writing, software
10:        // distributed under the License is distributed on an "AS IS" BASIS,
11:        // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12:        // See the License for the specific language governing permissions and
13:        // limitations under the License.
14:
15:        package org.apache.tapestry.ioc;
16:
17:        /**
18:         * Object providers represent an alternate way to locate an object provided somewhere in the
19:         * {@link org.apache.tapestry.ioc.Registry}. Instead of using a just the service id to gain access
20:         * to a service within the Registry, object providers in different flavors are capable of vending,
21:         * or even creating, objects of disparate types from disparate sources.
22:         * <p>
23:         * Object providers are consulted in a strict order, and the first non-null result is taken.
24:         * <p>
25:         * In many cases, an object provider searches for additional annotations on the element (usually a
26:         * parameter, or perhaps a field) for which a value is required.
27:         * <p>
28:         * A default ObjectProvider uses {@link ObjectLocator#getService(Class)}.
29:         */
30:        public interface ObjectProvider {
31:            /**
32:             * Provides an object based on an expression. The process of providing objects occurs within a
33:             * particular <em>context</em>, which will typically be a service builder method, service
34:             * contributor method, or service decorator method. The locator parameter provides access to the
35:             * services visible <em>to that context</em>.
36:             * 
37:             * @param objectType
38:             *            the expected object type
39:             * @param annotationProvider
40:             *            provides access to annotations (typically, the field or parameter to which an
41:             *            injection-related annotation is attached); annotations on the field or parameter
42:             *            may also be used when resolving the desired object
43:             * @param locator
44:             *            locator for the <em>context</em> in which the provider is being used
45:             * @param <T>
46:             * @return the requested object, or null if this object provider can not supply an object
47:             * @throws RuntimeException
48:             *             if the expression can not be evaluated, or the type of object identified is not
49:             *             assignable to the type specified by the objectType parameter
50:             */
51:            <T> T provide(Class<T> objectType,
52:                    AnnotationProvider annotationProvider, ObjectLocator locator);
53:        }
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