01: /*
02: * Copyright (C) 2007 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: */
16:
17: package com.bm.ejb3guice.util;
18:
19: import com.bm.ejb3guice.inject.Provider;
20:
21: /**
22: * Static utility methods for creating and working with instances of
23: * {@link Provider}.
24: *
25: * @author Kevin Bourrillion (kevinb9n@gmail.com)
26: */
27: public final class Providers {
28:
29: private Providers() {
30: }
31:
32: /**
33: * Returns a provider which always provides {@code instance}. This should not
34: * be necessary to use in your application, but is helpful for several types
35: * of unit tests.
36: *
37: * @param instance the instance that should always be provided. This is also
38: * permitted to be null, to enable aggressive testing, although in real
39: * life a Guice-supplied Provider will never return null.
40: */
41: public static <T> Provider<T> of(final T instance) {
42: return new Provider<T>() {
43: public T get() {
44: return instance;
45: }
46: };
47: }
48: }
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