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com.google.common.collect.ImmutableClassToInstanceMap Maven / Gradle / Ivy
/*
* 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 static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.primitives.Primitives;
import java.io.Serializable;
import java.util.Map;
import javax.annotation.Nullable;
/**
* A class-to-instance map backed by an {@link ImmutableMap}. See also {@link
* MutableClassToInstanceMap}.
*
* @author Kevin Bourrillion
* @since 2.0 (imported from Google Collections Library)
*/
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}.
*/
@SuppressWarnings("unchecked")
public static ImmutableClassToInstanceMap of() {
return (ImmutableClassToInstanceMap) EMPTY;
}
/**
* Returns an {@code ImmutableClassToInstanceMap} containing a single entry.
*/
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 (imported from Google Collections Library)
*/
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.
*/
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
*/
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
@Nullable
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.
*/
@Deprecated
@Override
public T putInstance(Class type, T value) {
throw new UnsupportedOperationException();
}
Object readResolve() {
return isEmpty() ? of() : this;
}
}
