01: // Copyright 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.services;
16:
17: import org.apache.tapestry.ioc.AnnotationProvider;
18: import org.apache.tapestry.ioc.ObjectLocator;
19: import org.apache.tapestry.ioc.ObjectProvider;
20: import org.apache.tapestry.ioc.annotations.InjectService;
21: import org.apache.tapestry.ioc.annotations.Symbol;
22: import org.apache.tapestry.ioc.services.SymbolSource;
23: import org.apache.tapestry.ioc.services.TypeCoercer;
24:
25: /**
26: * Performs an injection based on a {@link Symbol} annotation.
27: */
28: public class SymbolObjectProvider implements ObjectProvider {
29: private final SymbolSource _symbolSource;
30:
31: private final TypeCoercer _typeCoercer;
32:
33: public SymbolObjectProvider(@InjectService("SymbolSource")
34: SymbolSource symbolSource,
35:
36: @InjectService("TypeCoercer")
37: TypeCoercer typeCoercer) {
38: _symbolSource = symbolSource;
39: _typeCoercer = typeCoercer;
40: }
41:
42: public <T> T provide(Class<T> objectType,
43: AnnotationProvider annotationProvider, ObjectLocator locator) {
44: Symbol annotation = annotationProvider
45: .getAnnotation(Symbol.class);
46:
47: if (annotation == null)
48: return null;
49:
50: String symbolValue = _symbolSource.valueForSymbol(annotation
51: .value());
52:
53: return _typeCoercer.coerce(symbolValue, objectType);
54: }
55:
56: }
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