01: /**
02: * Copyright (C) 2006 Google Inc.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
10: * Unless required by applicable law or agreed to in writing, software
11: * distributed under the License is distributed on an "AS IS" BASIS,
12: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13: * See the License for the specific language governing permissions and
14: * limitations under the License.
15: */package com.google.inject;
16:
17: import com.google.inject.spi.SourceProviders;
18: import com.google.inject.util.Objects;
19:
20: /**
21: * @author crazybob@google.com (Bob Lee)
22: */
23: class InternalFactoryToProviderAdapter<T> implements InternalFactory<T> {
24:
25: private final Provider<? extends T> provider;
26: private final Object source;
27:
28: public InternalFactoryToProviderAdapter(
29: Provider<? extends T> provider) {
30: this (provider, SourceProviders.UNKNOWN_SOURCE);
31: }
32:
33: public InternalFactoryToProviderAdapter(
34: Provider<? extends T> provider, Object source) {
35: this .provider = Objects.nonNull(provider, "provider");
36: this .source = Objects.nonNull(source, "source");
37: }
38:
39: public T get(InternalContext context) {
40: T provided = provider.get();
41: if (provided != null) {
42: return provided;
43: }
44:
45: // TODO(kevinb): gee, ya think we might want to remove this?
46: if (("I'm a bad hack".equals(System
47: .getProperty("guice.allow.nulls.bad.bad.bad")))) {
48: return provided;
49: }
50: String message = String.format(ErrorMessages.NULL_PROVIDED,
51: source);
52: throw new ProvisionException(context.getExternalContext(),
53: new NullPointerException(message));
54: }
55:
56: public String toString() {
57: return provider.toString();
58: }
59: }
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