1/**
2 * Copyright (C) 2009 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 */
16package com.google.inject.assistedinject;
17
18import com.google.common.collect.ImmutableSet;
19import com.google.common.collect.Maps;
20import com.google.inject.ConfigurationException;
21import com.google.inject.Key;
22import com.google.inject.TypeLiteral;
23import com.google.inject.spi.Message;
24
25import java.util.Collections;
26import java.util.Map;
27
28/**
29 * Utility class for collecting factory bindings. Used for configuring {@link FactoryProvider2}.
30 *
31 * @author schmitt@google.com (Peter Schmitt)
32 */
33class BindingCollector {
34
35  private final Map<Key<?>, TypeLiteral<?>> bindings = Maps.newHashMap();
36
37  public BindingCollector addBinding(Key<?> key, TypeLiteral<?> target) {
38    if (bindings.containsKey(key)) {
39      throw new ConfigurationException(ImmutableSet.of(
40          new Message("Only one implementation can be specified for " + key)));
41    }
42
43    bindings.put(key, target);
44
45    return this;
46  }
47
48  public Map<Key<?>, TypeLiteral<?>> getBindings() {
49    return Collections.unmodifiableMap(bindings);
50  }
51
52  @Override
53  public int hashCode() {
54    return bindings.hashCode();
55  }
56
57  @Override
58  public boolean equals(Object obj) {
59    return (obj instanceof BindingCollector) && bindings.equals(((BindingCollector) obj).bindings);
60  }
61}
62