limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 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 | |
| 17 | package com.google.inject.commands; |
| 18 | |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 19 | import com.google.inject.*; |
| 20 | import com.google.inject.spi.SourceProviders; |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 21 | import com.google.inject.binder.AnnotatedBindingBuilder; |
| 22 | import com.google.inject.binder.ConstantBindingBuilder; |
| 23 | import com.google.inject.binder.LinkedBindingBuilder; |
| 24 | import com.google.inject.binder.ScopedBindingBuilder; |
| 25 | import static com.google.inject.internal.Objects.nonNull; |
| 26 | |
| 27 | import java.lang.annotation.Annotation; |
| 28 | |
| 29 | /** |
| 30 | * Immutable snapshot of a request to bind a value. |
| 31 | * |
| 32 | * @author jessewilson@google.com (Jesse Wilson) |
| 33 | */ |
| 34 | public final class BindCommand<T> implements Command { |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 35 | |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 36 | static { |
| 37 | SourceProviders.skip(BindCommand.BindingBuilder.class); |
| 38 | } |
| 39 | |
| 40 | private static final BindTarget<Object> EMPTY_BIND_TARGET = new AbstractTarget<Object>() { |
| 41 | public ScopedBindingBuilder execute(LinkedBindingBuilder<Object> linkedBindingBuilder) { |
| 42 | return linkedBindingBuilder; |
| 43 | } |
| 44 | public <V> V acceptVisitor(Visitor<Object, V> visitor) { |
| 45 | return visitor.visitUntargetted(); |
| 46 | } |
| 47 | }; |
| 48 | |
| 49 | private static final BindScoping EMPTY_SCOPING = new AbstractScoping() { |
| 50 | public void execute(ScopedBindingBuilder scopedBindingBuilder) { |
| 51 | // do nothing |
| 52 | } |
| 53 | public <V> V acceptVisitor(Visitor<V> visitor) { |
| 54 | return visitor.visitNoScoping(); |
| 55 | } |
| 56 | }; |
| 57 | |
| 58 | private final Object source; |
| 59 | private Key<T> key; |
| 60 | @SuppressWarnings({"unchecked"}) |
| 61 | private BindTarget<T> bindTarget = (BindTarget<T>) EMPTY_BIND_TARGET; |
| 62 | private BindScoping bindScoping = EMPTY_SCOPING; |
| 63 | |
| 64 | BindCommand(Object source, Key<T> key) { |
| 65 | this.source = nonNull(source, "source"); |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 66 | this.key = nonNull(key, "key"); |
| 67 | } |
| 68 | |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 69 | public Object getSource() { |
| 70 | return source; |
| 71 | } |
| 72 | |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 73 | public <V> V acceptVisitor(Visitor<V> visitor) { |
| 74 | return visitor.visitBind(this); |
| 75 | } |
| 76 | |
| 77 | public Key<T> getKey() { |
| 78 | return key; |
| 79 | } |
| 80 | |
| 81 | public BindTarget<T> getTarget() { |
| 82 | return bindTarget; |
| 83 | } |
| 84 | |
| 85 | public BindScoping getScoping() { |
| 86 | return bindScoping; |
| 87 | } |
| 88 | |
| 89 | @Override public String toString() { |
| 90 | return "bind " + key |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 91 | + (bindTarget == EMPTY_BIND_TARGET ? "" : (" to " + bindTarget)) |
| 92 | + (bindScoping == EMPTY_SCOPING ? "" : (" in " + bindScoping)); |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 93 | } |
| 94 | |
| 95 | private static abstract class AbstractTarget<T> implements BindTarget<T> { |
| 96 | public void execute(ConstantBindingBuilder builder) { |
| 97 | throw new UnsupportedOperationException(); |
| 98 | } |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 99 | public T get() { |
| 100 | return null; |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 101 | } |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 102 | public Key<? extends Provider<? extends T>> getProviderKey() { |
| 103 | return null; |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 104 | } |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 105 | public Provider<? extends T> getProvider() { |
| 106 | return null; |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 107 | } |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 108 | public Key<? extends T> getKey() { |
| 109 | return null; |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 110 | } |
| 111 | } |
| 112 | |
| 113 | private static abstract class AbstractScoping implements BindScoping { |
| 114 | public boolean isEagerSingleton() { |
| 115 | return false; |
| 116 | } |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 117 | public Scope getScope() { |
| 118 | return null; |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 119 | } |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 120 | public Class<? extends Annotation> getScopeAnnotation() { |
| 121 | return null; |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 122 | } |
| 123 | } |
| 124 | |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 125 | BindingBuilder bindingBuilder(Binder binder) { |
| 126 | return new BindingBuilder(binder); |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 127 | } |
| 128 | |
| 129 | /** |
| 130 | * Package-private write access to the internal state of this command. |
| 131 | */ |
| 132 | class BindingBuilder implements AnnotatedBindingBuilder<T> { |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 133 | private final Binder binder; |
| 134 | |
| 135 | BindingBuilder(Binder binder) { |
| 136 | this.binder = binder; |
| 137 | } |
| 138 | |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 139 | public LinkedBindingBuilder<T> annotatedWith( |
| 140 | Class<? extends Annotation> annotationType) { |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 141 | nonNull(annotationType, "annotationType"); |
limpbizkit | 7f8eda0 | 2008-03-26 01:11:16 +0000 | [diff] [blame^] | 142 | checkNotAnnotated(); |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 143 | key = Key.get(key.getTypeLiteral(), annotationType); |
| 144 | return this; |
| 145 | } |
| 146 | |
| 147 | public LinkedBindingBuilder<T> annotatedWith(Annotation annotation) { |
| 148 | nonNull(annotation, "annotation"); |
limpbizkit | 7f8eda0 | 2008-03-26 01:11:16 +0000 | [diff] [blame^] | 149 | checkNotAnnotated(); |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 150 | key = Key.get(key.getTypeLiteral(), annotation); |
| 151 | return this; |
| 152 | } |
| 153 | |
| 154 | public ScopedBindingBuilder to(final Class<? extends T> implementation) { |
| 155 | return to(Key.get(implementation)); |
| 156 | } |
| 157 | |
| 158 | public ScopedBindingBuilder to( |
| 159 | final TypeLiteral<? extends T> implementation) { |
| 160 | return to(Key.get(implementation)); |
| 161 | } |
| 162 | |
| 163 | public ScopedBindingBuilder to(final Key<? extends T> targetKey) { |
| 164 | nonNull(targetKey, "targetKey"); |
limpbizkit | 7f8eda0 | 2008-03-26 01:11:16 +0000 | [diff] [blame^] | 165 | checkNotTargetted(); |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 166 | bindTarget = new AbstractTarget<T>() { |
| 167 | public ScopedBindingBuilder execute(LinkedBindingBuilder<T> linkedBindingBuilder) { |
| 168 | return linkedBindingBuilder.to(targetKey); |
| 169 | } |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 170 | @Override public Key<? extends T> getKey() { |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 171 | return targetKey; |
| 172 | } |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 173 | public <V> V acceptVisitor(Visitor<T, V> visitor) { |
| 174 | return visitor.visitToKey(targetKey); |
| 175 | } |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 176 | @Override public String toString() { |
| 177 | return String.valueOf(targetKey); |
| 178 | } |
| 179 | }; |
| 180 | return this; |
| 181 | } |
| 182 | |
| 183 | public void toInstance(final T instance) { |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 184 | // might someday want to tolerate null here, probably by setting up a |
| 185 | // Provider<null> rather than trying to distinguish between null and |
| 186 | // not set |
| 187 | nonNull(instance, "instance"); |
| 188 | |
limpbizkit | 7f8eda0 | 2008-03-26 01:11:16 +0000 | [diff] [blame^] | 189 | checkNotTargetted(); |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 190 | bindTarget = new AbstractTarget<T>() { |
| 191 | public ScopedBindingBuilder execute(LinkedBindingBuilder<T> linkedBindingBuilder) { |
| 192 | linkedBindingBuilder.toInstance(instance); |
| 193 | return null; |
| 194 | } |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 195 | @Override public T get() { |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 196 | return instance; |
| 197 | } |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 198 | public <V> V acceptVisitor(Visitor<T, V> visitor) { |
| 199 | return visitor.visitToInstance(instance); |
| 200 | } |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 201 | @Override public String toString() { |
| 202 | return "instance " + instance; |
| 203 | } |
| 204 | }; |
| 205 | } |
| 206 | |
| 207 | public ScopedBindingBuilder toProvider(final Provider<? extends T> provider) { |
| 208 | nonNull(provider, "provider"); |
limpbizkit | 7f8eda0 | 2008-03-26 01:11:16 +0000 | [diff] [blame^] | 209 | checkNotTargetted(); |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 210 | bindTarget = new AbstractTarget<T>() { |
| 211 | public ScopedBindingBuilder execute(LinkedBindingBuilder<T> linkedBindingBuilder) { |
| 212 | return linkedBindingBuilder.toProvider(provider); |
| 213 | } |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 214 | @Override public Provider<? extends T> getProvider() { |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 215 | return provider; |
| 216 | } |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 217 | public <V> V acceptVisitor(Visitor<T, V> visitor) { |
| 218 | return visitor.visitToProvider(provider); |
| 219 | } |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 220 | @Override public String toString() { |
| 221 | return "provider " + provider; |
| 222 | } |
| 223 | }; |
| 224 | return this; |
| 225 | } |
| 226 | |
| 227 | public ScopedBindingBuilder toProvider( |
| 228 | Class<? extends Provider<? extends T>> providerType) { |
| 229 | return toProvider(Key.get(providerType)); |
| 230 | } |
| 231 | |
| 232 | public ScopedBindingBuilder toProvider( |
| 233 | final Key<? extends Provider<? extends T>> providerKey) { |
| 234 | nonNull(providerKey, "providerKey"); |
limpbizkit | 7f8eda0 | 2008-03-26 01:11:16 +0000 | [diff] [blame^] | 235 | checkNotTargetted(); |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 236 | bindTarget = new AbstractTarget<T>() { |
| 237 | public ScopedBindingBuilder execute(LinkedBindingBuilder<T> linkedBindingBuilder) { |
| 238 | return linkedBindingBuilder.toProvider(providerKey); |
| 239 | } |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 240 | @Override public Key<? extends Provider<? extends T>> getProviderKey() { |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 241 | return providerKey; |
| 242 | } |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 243 | public <V> V acceptVisitor(Visitor<T, V> visitor) { |
| 244 | return visitor.visitToProviderKey(providerKey); |
| 245 | } |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 246 | @Override public String toString() { |
| 247 | return "provider " + providerKey; |
| 248 | } |
| 249 | }; |
| 250 | return this; |
| 251 | } |
| 252 | |
| 253 | public void in(final Class<? extends Annotation> scopeAnnotation) { |
| 254 | nonNull(scopeAnnotation, "scopeAnnotation"); |
limpbizkit | 7f8eda0 | 2008-03-26 01:11:16 +0000 | [diff] [blame^] | 255 | checkNotScoped(); |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 256 | |
| 257 | bindScoping = new AbstractScoping() { |
| 258 | public void execute(ScopedBindingBuilder scopedBindingBuilder) { |
| 259 | scopedBindingBuilder.in(scopeAnnotation); |
| 260 | } |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 261 | @Override public Class<? extends Annotation> getScopeAnnotation() { |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 262 | return scopeAnnotation; |
| 263 | } |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 264 | public <V> V acceptVisitor(Visitor<V> visitor) { |
| 265 | return visitor.visitScopeAnnotation(scopeAnnotation); |
| 266 | } |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 267 | @Override public String toString() { |
| 268 | return scopeAnnotation.getName(); |
| 269 | } |
| 270 | }; |
| 271 | } |
| 272 | |
| 273 | public void in(final Scope scope) { |
| 274 | nonNull(scope, "scope"); |
limpbizkit | 7f8eda0 | 2008-03-26 01:11:16 +0000 | [diff] [blame^] | 275 | checkNotScoped(); |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 276 | bindScoping = new AbstractScoping() { |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 277 | |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 278 | public void execute(ScopedBindingBuilder scopedBindingBuilder) { |
| 279 | scopedBindingBuilder.in(scope); |
| 280 | } |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 281 | @Override public Scope getScope() { |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 282 | return scope; |
| 283 | } |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 284 | public <V> V acceptVisitor(Visitor<V> visitor) { |
| 285 | return visitor.visitScope(scope); |
| 286 | } |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 287 | @Override public String toString() { |
| 288 | return String.valueOf(scope); |
| 289 | } |
| 290 | }; |
| 291 | } |
| 292 | |
| 293 | public void asEagerSingleton() { |
limpbizkit | 7f8eda0 | 2008-03-26 01:11:16 +0000 | [diff] [blame^] | 294 | checkNotScoped(); |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 295 | bindScoping = new AbstractScoping() { |
| 296 | public void execute(ScopedBindingBuilder scopedBindingBuilder) { |
| 297 | scopedBindingBuilder.asEagerSingleton(); |
| 298 | } |
| 299 | @Override public boolean isEagerSingleton() { |
| 300 | return true; |
| 301 | } |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 302 | public <V> V acceptVisitor(Visitor<V> visitor) { |
| 303 | return visitor.visitEagerSingleton(); |
| 304 | } |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 305 | @Override public String toString() { |
| 306 | return "eager singleton"; |
| 307 | } |
| 308 | }; |
| 309 | } |
| 310 | |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 311 | static final String IMPLEMENTATION_ALREADY_SET |
| 312 | = "Implementation is set more than once."; |
| 313 | static final String SINGLE_INSTANCE_AND_SCOPE = "Setting the scope is not" |
| 314 | + " permitted when binding to a single instance."; |
| 315 | static final String SCOPE_ALREADY_SET = "Scope is set more than once."; |
| 316 | static final String ANNOTATION_ALREADY_SPECIFIED = "More than one annotation" |
| 317 | + " is specified for this binding."; |
| 318 | |
limpbizkit | 7f8eda0 | 2008-03-26 01:11:16 +0000 | [diff] [blame^] | 319 | private void checkNotTargetted() { |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 320 | if (bindTarget != EMPTY_BIND_TARGET) { |
| 321 | binder.addError(IMPLEMENTATION_ALREADY_SET); |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 322 | } |
| 323 | } |
| 324 | |
limpbizkit | 7f8eda0 | 2008-03-26 01:11:16 +0000 | [diff] [blame^] | 325 | private void checkNotAnnotated() { |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 326 | if (BindCommand.this.key.getAnnotationType() != null) { |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 327 | binder.addError(ANNOTATION_ALREADY_SPECIFIED); |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 328 | } |
| 329 | } |
| 330 | |
limpbizkit | 7f8eda0 | 2008-03-26 01:11:16 +0000 | [diff] [blame^] | 331 | private void checkNotScoped() { |
limpbizkit | 3d58d6b | 2008-03-08 16:11:47 +0000 | [diff] [blame] | 332 | // Scoping isn't allowed when we have only one instance. |
| 333 | if (bindTarget.get() != null) { |
| 334 | binder.addError(SINGLE_INSTANCE_AND_SCOPE); |
| 335 | return; |
| 336 | } |
| 337 | |
| 338 | if (bindScoping != EMPTY_SCOPING) { |
| 339 | binder.addError(SCOPE_ALREADY_SET); |
limpbizkit | a67e39f | 2008-02-18 20:10:59 +0000 | [diff] [blame] | 340 | } |
| 341 | } |
| 342 | } |
| 343 | } |