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    • com.google.common.collect.ImmutableClassToInstanceMap Maven / Gradle / Ivy

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    /*
 * Copyright (C) 2009 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect;

import org.checkerframework.framework.qual.AnnotatedFor;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.primitives.Primitives;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.io.Serializable;
import java.util.Map;
import org.checkerframework.checker.nullness.compatqual.NullableDecl;

/**
 * A {@link ClassToInstanceMap} whose contents will never change, with many other important
 * properties detailed at {@link ImmutableCollection}.
 *
 * @author Kevin Bourrillion
 * @since 2.0
 */
@AnnotatedFor({"nullness"})
@GwtIncompatible
public final class ImmutableClassToInstanceMap extends ForwardingMap, B>
    implements ClassToInstanceMap, Serializable {

  private static final ImmutableClassToInstanceMap EMPTY =
      new ImmutableClassToInstanceMap<>(ImmutableMap., Object>of());

  /**
   * Returns an empty {@code ImmutableClassToInstanceMap}.
   *
   * @since 19.0
   */
  @SuppressWarnings("unchecked")
  public static  ImmutableClassToInstanceMap of() {
    return (ImmutableClassToInstanceMap) EMPTY;
  }

  /**
   * Returns an {@code ImmutableClassToInstanceMap} containing a single entry.
   *
   * @since 19.0
   */
  public static  ImmutableClassToInstanceMap of(Class type, T value) {
    ImmutableMap, B> map = ImmutableMap., B>of(type, value);
    return new ImmutableClassToInstanceMap(map);
  }

  /**
   * Returns a new builder. The generated builder is equivalent to the builder created by the {@link
   * Builder} constructor.
   */
  public static  Builder builder() {
    return new Builder();
  }

  /**
   * A builder for creating immutable class-to-instance maps. Example:
   *
   * 
    {@code
   * static final ImmutableClassToInstanceMap HANDLERS =
   *     new ImmutableClassToInstanceMap.Builder()
   *         .put(FooHandler.class, new FooHandler())
   *         .put(BarHandler.class, new SubBarHandler())
   *         .put(Handler.class, new QuuxHandler())
   *         .build();
   * }
    
   *
   * 
    After invoking {@link #build()} it is still possible to add more entries and build again.
   * Thus each map generated by this builder will be a superset of any map generated before it.
   *
   * @since 2.0
   */
  public static final class Builder {
    private final ImmutableMap.Builder, B> mapBuilder = ImmutableMap.builder();

    /**
     * Associates {@code key} with {@code value} in the built map. Duplicate keys are not allowed,
     * and will cause {@link #build} to fail.
     */
    @CanIgnoreReturnValue
    public  Builder put(Class key, T value) {
      mapBuilder.put(key, value);
      return this;
    }

    /**
     * Associates all of {@code map's} keys and values in the built map. Duplicate keys are not
     * allowed, and will cause {@link #build} to fail.
     *
     * @throws NullPointerException if any key or value in {@code map} is null
     * @throws ClassCastException if any value is not an instance of the type specified by its key
     */
    @CanIgnoreReturnValue
    public  Builder putAll(Map, ? extends T> map) {
      for (Entry, ? extends T> entry : map.entrySet()) {
        Class type = entry.getKey();
        T value = entry.getValue();
        mapBuilder.put(type, cast(type, value));
      }
      return this;
    }

    private static  T cast(Class type, B value) {
      return Primitives.wrap(type).cast(value);
    }

    /**
     * Returns a new immutable class-to-instance map containing the entries provided to this
     * builder.
     *
     * @throws IllegalArgumentException if duplicate keys were added
     */
    public ImmutableClassToInstanceMap build() {
      ImmutableMap, B> map = mapBuilder.build();
      if (map.isEmpty()) {
        return of();
      } else {
        return new ImmutableClassToInstanceMap(map);
      }
    }
  }

  /**
   * Returns an immutable map containing the same entries as {@code map}. If {@code map} somehow
   * contains entries with duplicate keys (for example, if it is a {@code SortedMap} whose
   * comparator is not consistent with equals), the results of this method are undefined.
   *
   * 
    Note: Despite what the method name suggests, if {@code map} is an {@code
   * ImmutableClassToInstanceMap}, no copy will actually be performed.
   *
   * @throws NullPointerException if any key or value in {@code map} is null
   * @throws ClassCastException if any value is not an instance of the type specified by its key
   */
  public static  ImmutableClassToInstanceMap copyOf(
      Map, ? extends S> map) {
    if (map instanceof ImmutableClassToInstanceMap) {
      @SuppressWarnings("unchecked") // covariant casts safe (unmodifiable)
      // Eclipse won't compile if we cast to the parameterized type.
      ImmutableClassToInstanceMap cast = (ImmutableClassToInstanceMap) map;
      return cast;
    }
    return new Builder().putAll(map).build();
  }

  private final ImmutableMap, B> delegate;

  private ImmutableClassToInstanceMap(ImmutableMap, B> delegate) {
    this.delegate = delegate;
  }

  @Override
  protected Map, B> delegate() {
    return delegate;
  }

  @Override
  @SuppressWarnings("unchecked") // value could not get in if not a T
  @NullableDecl
  public  T getInstance(Class type) {
    return (T) delegate.get(checkNotNull(type));
  }

  /**
   * Guaranteed to throw an exception and leave the map unmodified.
   *
   * @throws UnsupportedOperationException always
   * @deprecated Unsupported operation.
   */
  @CanIgnoreReturnValue
  @Deprecated
  @Override
  public  T putInstance(Class type, T value) {
    throw new UnsupportedOperationException();
  }

  Object readResolve() {
    return isEmpty() ? of() : this;
  }
}
    
    
    
    

    




    
    
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