17dd252788645e940eada959bdde927426e2531c9Paul Duffin/* 27dd252788645e940eada959bdde927426e2531c9Paul Duffin * Copyright (C) 2012 The Guava Authors 37dd252788645e940eada959bdde927426e2531c9Paul Duffin * 47dd252788645e940eada959bdde927426e2531c9Paul Duffin * Licensed under the Apache License, Version 2.0 (the "License"); 57dd252788645e940eada959bdde927426e2531c9Paul Duffin * you may not use this file except in compliance with the License. 67dd252788645e940eada959bdde927426e2531c9Paul Duffin * You may obtain a copy of the License at 77dd252788645e940eada959bdde927426e2531c9Paul Duffin * 87dd252788645e940eada959bdde927426e2531c9Paul Duffin * http://www.apache.org/licenses/LICENSE-2.0 97dd252788645e940eada959bdde927426e2531c9Paul Duffin * 107dd252788645e940eada959bdde927426e2531c9Paul Duffin * Unless required by applicable law or agreed to in writing, software 117dd252788645e940eada959bdde927426e2531c9Paul Duffin * distributed under the License is distributed on an "AS IS" BASIS, 127dd252788645e940eada959bdde927426e2531c9Paul Duffin * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 137dd252788645e940eada959bdde927426e2531c9Paul Duffin * See the License for the specific language governing permissions and 147dd252788645e940eada959bdde927426e2531c9Paul Duffin * limitations under the License. 157dd252788645e940eada959bdde927426e2531c9Paul Duffin */ 167dd252788645e940eada959bdde927426e2531c9Paul Duffin 177dd252788645e940eada959bdde927426e2531c9Paul Duffinpackage com.google.common.reflect; 187dd252788645e940eada959bdde927426e2531c9Paul Duffin 197dd252788645e940eada959bdde927426e2531c9Paul Duffinimport com.google.common.annotations.Beta; 207dd252788645e940eada959bdde927426e2531c9Paul Duffin 217dd252788645e940eada959bdde927426e2531c9Paul Duffinimport java.util.Map; 227dd252788645e940eada959bdde927426e2531c9Paul Duffin 237dd252788645e940eada959bdde927426e2531c9Paul Duffinimport javax.annotation.Nullable; 247dd252788645e940eada959bdde927426e2531c9Paul Duffin 257dd252788645e940eada959bdde927426e2531c9Paul Duffin/** 267dd252788645e940eada959bdde927426e2531c9Paul Duffin * A map, each entry of which maps a {@link TypeToken} to an instance of that type. 277dd252788645e940eada959bdde927426e2531c9Paul Duffin * In addition to implementing {@code Map}, the additional type-safe operations 287dd252788645e940eada959bdde927426e2531c9Paul Duffin * {@link #putInstance} and {@link #getInstance} are available. 297dd252788645e940eada959bdde927426e2531c9Paul Duffin * 307dd252788645e940eada959bdde927426e2531c9Paul Duffin * <p>Generally, implementations don't support {@link #put} and {@link #putAll} 317dd252788645e940eada959bdde927426e2531c9Paul Duffin * because there is no way to check an object at runtime to be an instance of a 327dd252788645e940eada959bdde927426e2531c9Paul Duffin * {@link TypeToken}. Instead, caller should use the type safe {@link #putInstance}. 337dd252788645e940eada959bdde927426e2531c9Paul Duffin * 347dd252788645e940eada959bdde927426e2531c9Paul Duffin * <p>Also, if caller suppresses unchecked warnings and passes in an {@code Iterable<String>} 357dd252788645e940eada959bdde927426e2531c9Paul Duffin * for type {@code Iterable<Integer>}, the map won't be able to detect and throw type error. 367dd252788645e940eada959bdde927426e2531c9Paul Duffin * 377dd252788645e940eada959bdde927426e2531c9Paul Duffin * <p>Like any other {@code Map<Class, Object>}, this map may contain entries 387dd252788645e940eada959bdde927426e2531c9Paul Duffin * for primitive types, and a primitive type and its corresponding wrapper type 397dd252788645e940eada959bdde927426e2531c9Paul Duffin * may map to different values. 407dd252788645e940eada959bdde927426e2531c9Paul Duffin * 417dd252788645e940eada959bdde927426e2531c9Paul Duffin * @param <B> the common supertype that all entries must share; often this is 427dd252788645e940eada959bdde927426e2531c9Paul Duffin * simply {@link Object} 437dd252788645e940eada959bdde927426e2531c9Paul Duffin * 447dd252788645e940eada959bdde927426e2531c9Paul Duffin * @author Ben Yu 457dd252788645e940eada959bdde927426e2531c9Paul Duffin * @since 13.0 467dd252788645e940eada959bdde927426e2531c9Paul Duffin */ 477dd252788645e940eada959bdde927426e2531c9Paul Duffin@Beta 480888a09821a98ac0680fad765217302858e70fa4Paul Duffinpublic interface TypeToInstanceMap<B> extends Map<TypeToken<? extends B>, B> { 497dd252788645e940eada959bdde927426e2531c9Paul Duffin 507dd252788645e940eada959bdde927426e2531c9Paul Duffin /** 517dd252788645e940eada959bdde927426e2531c9Paul Duffin * Returns the value the specified class is mapped to, or {@code null} if no 527dd252788645e940eada959bdde927426e2531c9Paul Duffin * entry for this class is present. This will only return a value that was 537dd252788645e940eada959bdde927426e2531c9Paul Duffin * bound to this specific class, not a value that may have been bound to a 547dd252788645e940eada959bdde927426e2531c9Paul Duffin * subtype. 557dd252788645e940eada959bdde927426e2531c9Paul Duffin * 567dd252788645e940eada959bdde927426e2531c9Paul Duffin * <p>{@code getInstance(Foo.class)} is equivalent to 577dd252788645e940eada959bdde927426e2531c9Paul Duffin * {@code getInstance(TypeToken.of(Foo.class))}. 587dd252788645e940eada959bdde927426e2531c9Paul Duffin */ 597dd252788645e940eada959bdde927426e2531c9Paul Duffin @Nullable 607dd252788645e940eada959bdde927426e2531c9Paul Duffin <T extends B> T getInstance(Class<T> type); 617dd252788645e940eada959bdde927426e2531c9Paul Duffin 627dd252788645e940eada959bdde927426e2531c9Paul Duffin /** 637dd252788645e940eada959bdde927426e2531c9Paul Duffin * Maps the specified class to the specified value. Does <i>not</i> associate 647dd252788645e940eada959bdde927426e2531c9Paul Duffin * this value with any of the class's supertypes. 657dd252788645e940eada959bdde927426e2531c9Paul Duffin * 667dd252788645e940eada959bdde927426e2531c9Paul Duffin * <p>{@code putInstance(Foo.class, foo)} is equivalent to 677dd252788645e940eada959bdde927426e2531c9Paul Duffin * {@code putInstance(TypeToken.of(Foo.class), foo)}. 687dd252788645e940eada959bdde927426e2531c9Paul Duffin * 697dd252788645e940eada959bdde927426e2531c9Paul Duffin * @return the value previously associated with this class (possibly {@code null}), 707dd252788645e940eada959bdde927426e2531c9Paul Duffin * or {@code null} if there was no previous entry. 717dd252788645e940eada959bdde927426e2531c9Paul Duffin */ 727dd252788645e940eada959bdde927426e2531c9Paul Duffin @Nullable 737dd252788645e940eada959bdde927426e2531c9Paul Duffin <T extends B> T putInstance(Class<T> type, @Nullable T value); 747dd252788645e940eada959bdde927426e2531c9Paul Duffin 757dd252788645e940eada959bdde927426e2531c9Paul Duffin /** 767dd252788645e940eada959bdde927426e2531c9Paul Duffin * Returns the value the specified type is mapped to, or {@code null} if no 777dd252788645e940eada959bdde927426e2531c9Paul Duffin * entry for this type is present. This will only return a value that was 787dd252788645e940eada959bdde927426e2531c9Paul Duffin * bound to this specific type, not a value that may have been bound to a subtype. 797dd252788645e940eada959bdde927426e2531c9Paul Duffin */ 807dd252788645e940eada959bdde927426e2531c9Paul Duffin @Nullable 817dd252788645e940eada959bdde927426e2531c9Paul Duffin <T extends B> T getInstance(TypeToken<T> type); 827dd252788645e940eada959bdde927426e2531c9Paul Duffin 837dd252788645e940eada959bdde927426e2531c9Paul Duffin /** 847dd252788645e940eada959bdde927426e2531c9Paul Duffin * Maps the specified type to the specified value. Does <i>not</i> associate 857dd252788645e940eada959bdde927426e2531c9Paul Duffin * this value with any of the type's supertypes. 867dd252788645e940eada959bdde927426e2531c9Paul Duffin * 877dd252788645e940eada959bdde927426e2531c9Paul Duffin * @return the value previously associated with this type (possibly {@code null}), 887dd252788645e940eada959bdde927426e2531c9Paul Duffin * or {@code null} if there was no previous entry. 897dd252788645e940eada959bdde927426e2531c9Paul Duffin */ 907dd252788645e940eada959bdde927426e2531c9Paul Duffin @Nullable 917dd252788645e940eada959bdde927426e2531c9Paul Duffin <T extends B> T putInstance(TypeToken<T> type, @Nullable T value); 927dd252788645e940eada959bdde927426e2531c9Paul Duffin} 93