1/**
2 * Copyright (C) 2008 Google Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
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
17package com.google.inject.internal;
18
19import static com.google.common.base.Preconditions.checkNotNull;
20
21import com.google.inject.Scope;
22import com.google.inject.spi.ScopeBinding;
23
24import java.lang.annotation.Annotation;
25
26/**
27 * Handles {@code Binder.bindScope} commands.
28 *
29 * @author crazybob@google.com (Bob Lee)
30 * @author jessewilson@google.com (Jesse Wilson)
31 */
32final class ScopeBindingProcessor extends AbstractProcessor {
33
34  ScopeBindingProcessor(Errors errors) {
35    super(errors);
36  }
37
38  @Override public Boolean visit(ScopeBinding command) {
39    Scope scope = checkNotNull(command.getScope(), "scope");
40    Class<? extends Annotation> annotationType = checkNotNull(command.getAnnotationType(), "annotation type");
41
42    if (!Annotations.isScopeAnnotation(annotationType)) {
43      errors.missingScopeAnnotation(annotationType);
44      // Go ahead and bind anyway so we don't get collateral errors.
45    }
46
47    if (!Annotations.isRetainedAtRuntime(annotationType)) {
48      errors.missingRuntimeRetention(annotationType);
49      // Go ahead and bind anyway so we don't get collateral errors.
50    }
51
52    ScopeBinding existing = injector.state.getScopeBinding(annotationType);
53    if (existing != null) {
54      if (!scope.equals(existing.getScope())) {
55        errors.duplicateScopes(existing, annotationType, scope);
56      }
57    } else {
58      injector.state.putScopeBinding(annotationType, command);
59    }
60
61    return true;
62  }
63}