Source Code Cross Referenced for ServiceBuilderMethodInvoker.java in  » Library » Tapestry » org » apache » tapestry » ioc » internal » 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.internal 
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.internal;
16:
17:        import java.lang.reflect.InvocationTargetException;
18:        import java.lang.reflect.Method;
19:        import java.util.Map;
20:
21:        import org.apache.tapestry.ioc.ServiceBuilderResources;
22:        import org.apache.tapestry.ioc.internal.util.InternalUtils;
23:
24:        /**
25:         * Basic implementation of {@link org.apache.tapestry.ioc.ObjectCreator} that handles invoking a
26:         * method on the module builder, and figures out the correct parameters to pass into the annotated
27:         * method.
28:         */
29:        public class ServiceBuilderMethodInvoker extends AbstractServiceCreator {
30:            private final Method _builderMethod;
31:
32:            public ServiceBuilderMethodInvoker(
33:                    ServiceBuilderResources resources,
34:                    String creatorDescription, Method method) {
35:                super (resources, creatorDescription);
36:
37:                _builderMethod = method;
38:            }
39:
40:            /**
41:             * Returns a map that includes (possibly) an additional mapping containing the collected
42:             * configuration data. This involves scanning the builder method's parameters.
43:             */
44:            private Map<Class, Object> getParameterDefaultsWithConfigurations() {
45:                return getParameterDefaultsWithConfiguration(_builderMethod
46:                        .getParameterTypes(), _builderMethod
47:                        .getGenericParameterTypes());
48:            }
49:
50:            /**
51:             * Invoked from the proxy to create the actual service implementation.
52:             */
53:            public Object createObject() {
54:                // Defer getting (and possibly instantitating) the module builder until the last possible
55:                // moment. If the method is static, there's no need to even get the builder.
56:
57:                Object moduleBuilder = InternalUtils.isStatic(_builderMethod) ? null
58:                        : _resources.getModuleBuilder();
59:
60:                Object result = null;
61:                Throwable failure = null;
62:
63:                try {
64:                    Object[] parameters = InternalUtils
65:                            .calculateParametersForMethod(_builderMethod,
66:                                    _resources,
67:                                    getParameterDefaultsWithConfigurations());
68:
69:                    if (_log.isDebugEnabled())
70:                        _log.debug(IOCMessages
71:                                .invokingMethod(_creatorDescription));
72:
73:                    result = _builderMethod.invoke(moduleBuilder, parameters);
74:                } catch (InvocationTargetException ite) {
75:                    failure = ite.getTargetException();
76:                } catch (Exception ex) {
77:                    failure = ex;
78:                }
79:
80:                if (failure != null)
81:                    throw new RuntimeException(IOCMessages.builderMethodError(
82:                            _creatorDescription, _serviceId, failure), failure);
83:
84:                if (result == null)
85:                    throw new RuntimeException(IOCMessages
86:                            .builderMethodReturnedNull(_creatorDescription,
87:                                    _serviceId));
88:
89:                return result;
90:            }
91:        }
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