Java example source code file (ImmutableMap.java)
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The ImmutableMap.java Java example source code
/*
* Copyright (C) 2008 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 static com.google.common.base.Preconditions.checkState;
import static com.google.common.collect.CollectPreconditions.checkEntryNotNull;
import com.google.common.annotations.Beta;
import com.google.common.annotations.GwtCompatible;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import com.google.j2objc.annotations.WeakOuter;
import java.io.Serializable;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.EnumMap;
import java.util.Iterator;
import java.util.Map;
import javax.annotation.Nullable;
/**
* A {@link Map} whose contents will never change, with many other important properties detailed at
* {@link ImmutableCollection}.
*
* <p>See the Guava User Guide article on , Serializable {
/**
* Returns the empty map. This map behaves and performs comparably to
* {@link Collections#emptyMap}, and is preferable mainly for consistency
* and maintainability of your code.
*/
public static <K, V> ImmutableMap of() {
return ImmutableBiMap.of();
}
/**
* Returns an immutable map containing a single entry. This map behaves and
* performs comparably to {@link Collections#singletonMap} but will not accept
* a null key or value. It is preferable mainly for consistency and
* maintainability of your code.
*/
public static <K, V> ImmutableMap of(K k1, V v1) {
return ImmutableBiMap.of(k1, v1);
}
/**
* Returns an immutable map containing the given entries, in order.
*
* @throws IllegalArgumentException if duplicate keys are provided
*/
public static <K, V> ImmutableMap of(K k1, V v1, K k2, V v2) {
return RegularImmutableMap.fromEntries(entryOf(k1, v1), entryOf(k2, v2));
}
/**
* Returns an immutable map containing the given entries, in order.
*
* @throws IllegalArgumentException if duplicate keys are provided
*/
public static <K, V> ImmutableMap of(K k1, V v1, K k2, V v2, K k3, V v3) {
return RegularImmutableMap.fromEntries(entryOf(k1, v1), entryOf(k2, v2), entryOf(k3, v3));
}
/**
* Returns an immutable map containing the given entries, in order.
*
* @throws IllegalArgumentException if duplicate keys are provided
*/
public static <K, V> ImmutableMap of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4) {
return RegularImmutableMap.fromEntries(
entryOf(k1, v1), entryOf(k2, v2), entryOf(k3, v3), entryOf(k4, v4));
}
/**
* Returns an immutable map containing the given entries, in order.
*
* @throws IllegalArgumentException if duplicate keys are provided
*/
public static <K, V> ImmutableMap of(
K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5) {
return RegularImmutableMap.fromEntries(
entryOf(k1, v1), entryOf(k2, v2), entryOf(k3, v3), entryOf(k4, v4), entryOf(k5, v5));
}
// looking for of() with > 5 entries? Use the builder instead.
/**
* Verifies that {@code key} and {@code value} are non-null, and returns a new
* immutable entry with those values.
*
* <p>A call to {@link Map.Entry#setValue} on the returned entry will always
* throw {@link UnsupportedOperationException}.
*/
static <K, V> ImmutableMapEntry entryOf(K key, V value) {
return new ImmutableMapEntry<K, V>(key, value);
}
/**
* Returns a new builder. The generated builder is equivalent to the builder
* created by the {@link Builder} constructor.
*/
public static <K, V> Builder builder() {
return new Builder<K, V>();
}
static void checkNoConflict(
boolean safe, String conflictDescription, Entry<?, ?> entry1, Entry entry2) {
if (!safe) {
throw new IllegalArgumentException(
"Multiple entries with same " + conflictDescription + ": " + entry1 + " and " + entry2);
}
}
/**
* A builder for creating immutable map instances, especially {@code public
* static final} maps ("constant maps"). Example: <pre> {@code
*
* static final ImmutableMap<String, Integer> WORD_TO_INT =
* new ImmutableMap.Builder<String, Integer>()
* .put("one", 1)
* .put("two", 2)
* .put("three", 3)
* .build();}</pre>
*
* <p>For small immutable maps, the {@code ImmutableMap.of()} methods are
* even more convenient.
*
* <p>Builder instances can be reused - it is safe to call {@link #build}
* multiple times to build multiple maps in series. Each map is a superset of
* the maps created before it.
*
* @since 2.0
*/
public static class Builder<K, V> {
Comparator<? super V> valueComparator;
ImmutableMapEntry<K, V>[] entries;
int size;
boolean entriesUsed;
/**
* Creates a new builder. The returned builder is equivalent to the builder
* generated by {@link ImmutableMap#builder}.
*/
public Builder() {
this(ImmutableCollection.Builder.DEFAULT_INITIAL_CAPACITY);
}
@SuppressWarnings("unchecked")
Builder(int initialCapacity) {
this.entries = new ImmutableMapEntry[initialCapacity];
this.size = 0;
this.entriesUsed = false;
}
private void ensureCapacity(int minCapacity) {
if (minCapacity > entries.length) {
entries =
ObjectArrays.arraysCopyOf(
entries, ImmutableCollection.Builder.expandedCapacity(entries.length, minCapacity));
entriesUsed = false;
}
}
/**
* 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<K, V> put(K key, V value) {
ensureCapacity(size + 1);
ImmutableMapEntry<K, V> entry = entryOf(key, value);
// don't inline this: we want to fail atomically if key or value is null
entries[size++] = entry;
return this;
}
/**
* Adds the given {@code entry} to the map, making it immutable if
* necessary. Duplicate keys are not allowed, and will cause {@link #build}
* to fail.
*
* @since 11.0
*/
@CanIgnoreReturnValue
public Builder<K, V> put(Entry entry) {
return put(entry.getKey(), entry.getValue());
}
/**
* Associates all of the given 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
*/
@CanIgnoreReturnValue
public Builder<K, V> putAll(Map map) {
return putAll(map.entrySet());
}
/**
* Adds all of the given entries to the built map. Duplicate keys are not
* allowed, and will cause {@link #build} to fail.
*
* @throws NullPointerException if any key, value, or entry is null
* @since 19.0
*/
@CanIgnoreReturnValue
@Beta
public Builder<K, V> putAll(Iterable> entries) {
if (entries instanceof Collection) {
ensureCapacity(size + ((Collection<?>) entries).size());
}
for (Entry<? extends K, ? extends V> entry : entries) {
put(entry);
}
return this;
}
/**
* Configures this {@code Builder} to order entries by value according to the specified
* comparator.
*
* <p>The sort order is stable, that is, if two entries have values that compare
* as equivalent, the entry that was inserted first will be first in the built map's
* iteration order.
*
* @throws IllegalStateException if this method was already called
* @since 19.0
*/
@CanIgnoreReturnValue
@Beta
public Builder<K, V> orderEntriesByValue(Comparator valueComparator) {
checkState(this.valueComparator == null, "valueComparator was already set");
this.valueComparator = checkNotNull(valueComparator, "valueComparator");
return this;
}
/*
* TODO(kevinb): Should build() and the ImmutableBiMap & ImmutableSortedMap
* versions throw an IllegalStateException instead?
*/
/**
* Returns a newly-created immutable map.
*
* @throws IllegalArgumentException if duplicate keys were added
*/
public ImmutableMap<K, V> build() {
switch (size) {
case 0:
return of();
case 1:
return of(entries[0].getKey(), entries[0].getValue());
default:
/*
* If entries is full, then this implementation may end up using the entries array
* directly and writing over the entry objects with non-terminal entries, but this is
* safe; if this Builder is used further, it will grow the entries array (so it can't
* affect the original array), and future build() calls will always copy any entry
* objects that cannot be safely reused.
*/
if (valueComparator != null) {
if (entriesUsed) {
entries = ObjectArrays.arraysCopyOf(entries, size);
}
Arrays.sort(
entries,
0,
size,
Ordering.from(valueComparator).onResultOf(Maps.<V>valueFunction()));
}
entriesUsed = size == entries.length;
return RegularImmutableMap.fromEntryArray(size, entries);
}
}
}
/**
* 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 <i>consistent with
* equals</i>), the results of this method are undefined.
*
* <p>Despite the method name, this method attempts to avoid actually copying
* the data when it is safe to do so. The exact circumstances under which a
* copy will or will not be performed are undocumented and subject to change.
*
* @throws NullPointerException if any key or value in {@code map} is null
*/
public static <K, V> ImmutableMap copyOf(Map map) {
if ((map instanceof ImmutableMap) && !(map instanceof ImmutableSortedMap)) {
// TODO(lowasser): Make ImmutableMap.copyOf(immutableBiMap) call copyOf()
// on the ImmutableMap delegate(), rather than the bimap itself
@SuppressWarnings("unchecked") // safe since map is not writable
ImmutableMap<K, V> kvMap = (ImmutableMap) map;
if (!kvMap.isPartialView()) {
return kvMap;
}
} else if (map instanceof EnumMap) {
@SuppressWarnings("unchecked") // safe since map is not writable
ImmutableMap<K, V> kvMap = (ImmutableMap) copyOfEnumMap((EnumMap) map);
return kvMap;
}
return copyOf(map.entrySet());
}
/**
* Returns an immutable map containing the specified entries. The returned
* map iterates over entries in the same order as the original iterable.
*
* @throws NullPointerException if any key, value, or entry is null
* @throws IllegalArgumentException if two entries have the same key
* @since 19.0
*/
@Beta
public static <K, V> ImmutableMap copyOf(
Iterable<? extends Entry entries) {
@SuppressWarnings("unchecked") // we'll only be using getKey and getValue, which are covariant
Entry<K, V>[] entryArray = (Entry[]) Iterables.toArray(entries, EMPTY_ENTRY_ARRAY);
switch (entryArray.length) {
case 0:
return of();
case 1:
Entry<K, V> onlyEntry = entryArray[0];
return of(onlyEntry.getKey(), onlyEntry.getValue());
default:
/*
* The current implementation will end up using entryArray directly, though it will write
* over the (arbitrary, potentially mutable) Entry objects actually stored in entryArray.
*/
return RegularImmutableMap.fromEntries(entryArray);
}
}
private static <K extends Enum ImmutableMap copyOfEnumMap(
EnumMap<K, ? extends V> original) {
EnumMap<K, V> copy = new EnumMap(original);
for (Map.Entry<?, ?> entry : copy.entrySet()) {
checkEntryNotNull(entry.getKey(), entry.getValue());
}
return ImmutableEnumMap.asImmutable(copy);
}
static final Entry<?, ?>[] EMPTY_ENTRY_ARRAY = new Entry[0];
abstract static class IteratorBasedImmutableMap<K, V> extends ImmutableMap {
abstract UnmodifiableIterator<Entry entryIterator();
@Override
ImmutableSet<Entry createEntrySet() {
@WeakOuter
class EntrySetImpl extends ImmutableMapEntrySet<K, V> {
@Override
ImmutableMap<K, V> map() {
return IteratorBasedImmutableMap.this;
}
@Override
public UnmodifiableIterator<Entry iterator() {
return entryIterator();
}
}
return new EntrySetImpl();
}
}
ImmutableMap() {}
/**
* Guaranteed to throw an exception and leave the map unmodified.
*
* @throws UnsupportedOperationException always
* @deprecated Unsupported operation.
*/
@CanIgnoreReturnValue
@Deprecated
@Override
public final V put(K k, V v) {
throw new UnsupportedOperationException();
}
/**
* Guaranteed to throw an exception and leave the map unmodified.
*
* @throws UnsupportedOperationException always
* @deprecated Unsupported operation.
*/
@CanIgnoreReturnValue
@Deprecated
@Override
public final V remove(Object o) {
throw new UnsupportedOperationException();
}
/**
* Guaranteed to throw an exception and leave the map unmodified.
*
* @throws UnsupportedOperationException always
* @deprecated Unsupported operation.
*/
@Deprecated
@Override
public final void putAll(Map<? extends K, ? extends V> map) {
throw new UnsupportedOperationException();
}
/**
* Guaranteed to throw an exception and leave the map unmodified.
*
* @throws UnsupportedOperationException always
* @deprecated Unsupported operation.
*/
@Deprecated
@Override
public final void clear() {
throw new UnsupportedOperationException();
}
@Override
public boolean isEmpty() {
return size() == 0;
}
@Override
public boolean containsKey(@Nullable Object key) {
return get(key) != null;
}
@Override
public boolean containsValue(@Nullable Object value) {
return values().contains(value);
}
// Overriding to mark it Nullable
@Override
public abstract V get(@Nullable Object key);
private transient ImmutableSet<Entry entrySet;
/**
* Returns an immutable set of the mappings in this map. The entries are in
* the same order as the parameters used to build this map.
*/
@Override
public ImmutableSet<Entry entrySet() {
ImmutableSet<Entry result = entrySet;
return (result == null) ? entrySet = createEntrySet() : result;
}
abstract ImmutableSet<Entry createEntrySet();
private transient ImmutableSet<K> keySet;
/**
* Returns an immutable set of the keys in this map. These keys are in
* the same order as the parameters used to build this map.
*/
@Override
public ImmutableSet<K> keySet() {
ImmutableSet<K> result = keySet;
return (result == null) ? keySet = createKeySet() : result;
}
ImmutableSet<K> createKeySet() {
return isEmpty() ? ImmutableSet.<K>of() : new ImmutableMapKeySet(this);
}
UnmodifiableIterator<K> keyIterator() {
final UnmodifiableIterator<Entry entryIterator = entrySet().iterator();
return new UnmodifiableIterator<K>() {
@Override
public boolean hasNext() {
return entryIterator.hasNext();
}
@Override
public K next() {
return entryIterator.next().getKey();
}
};
}
private transient ImmutableCollection<V> values;
/**
* Returns an immutable collection of the values in this map. The values are
* in the same order as the parameters used to build this map.
*/
@Override
public ImmutableCollection<V> values() {
ImmutableCollection<V> result = values;
return (result == null) ? values = new ImmutableMapValues<K, V>(this) : result;
}
// cached so that this.multimapView().inverse() only computes inverse once
private transient ImmutableSetMultimap<K, V> multimapView;
/**
* Returns a multimap view of the map.
*
* @since 14.0
*/
@Beta
public ImmutableSetMultimap<K, V> asMultimap() {
if (isEmpty()) {
return ImmutableSetMultimap.of();
}
ImmutableSetMultimap<K, V> result = multimapView;
return (result == null)
? (multimapView =
new ImmutableSetMultimap<K, V>(new MapViewOfValuesAsSingletonSets(), size(), null))
: result;
}
@WeakOuter
private final class MapViewOfValuesAsSingletonSets
extends IteratorBasedImmutableMap<K, ImmutableSet {
@Override
public int size() {
return ImmutableMap.this.size();
}
@Override
public ImmutableSet<K> keySet() {
return ImmutableMap.this.keySet();
}
@Override
public boolean containsKey(@Nullable Object key) {
return ImmutableMap.this.containsKey(key);
}
@Override
public ImmutableSet<V> get(@Nullable Object key) {
V outerValue = ImmutableMap.this.get(key);
return (outerValue == null) ? null : ImmutableSet.of(outerValue);
}
@Override
boolean isPartialView() {
return ImmutableMap.this.isPartialView();
}
@Override
public int hashCode() {
// ImmutableSet.of(value).hashCode() == value.hashCode(), so the hashes are the same
return ImmutableMap.this.hashCode();
}
@Override
boolean isHashCodeFast() {
return ImmutableMap.this.isHashCodeFast();
}
@Override
UnmodifiableIterator<Entry> entryIterator() {
final Iterator<Entry backingIterator = ImmutableMap.this.entrySet().iterator();
return new UnmodifiableIterator<Entry>() {
@Override
public boolean hasNext() {
return backingIterator.hasNext();
}
@Override
public Entry<K, ImmutableSet next() {
final Entry<K, V> backingEntry = backingIterator.next();
return new AbstractMapEntry<K, ImmutableSet() {
@Override
public K getKey() {
return backingEntry.getKey();
}
@Override
public ImmutableSet<V> getValue() {
return ImmutableSet.of(backingEntry.getValue());
}
};
}
};
}
}
@Override
public boolean equals(@Nullable Object object) {
return Maps.equalsImpl(this, object);
}
abstract boolean isPartialView();
@Override
public int hashCode() {
return Sets.hashCodeImpl(entrySet());
}
boolean isHashCodeFast() {
return false;
}
@Override
public String toString() {
return Maps.toStringImpl(this);
}
/**
* Serialized type for all ImmutableMap instances. It captures the logical
* contents and they are reconstructed using public factory methods. This
* ensures that the implementation types remain as implementation details.
*/
static class SerializedForm implements Serializable {
private final Object[] keys;
private final Object[] values;
SerializedForm(ImmutableMap<?, ?> map) {
keys = new Object[map.size()];
values = new Object[map.size()];
int i = 0;
for (Entry<?, ?> entry : map.entrySet()) {
keys[i] = entry.getKey();
values[i] = entry.getValue();
i++;
}
}
Object readResolve() {
Builder<Object, Object> builder = new Builder(keys.length);
return createMap(builder);
}
Object createMap(Builder<Object, Object> builder) {
for (int i = 0; i < keys.length; i++) {
builder.put(keys[i], values[i]);
}
return builder.build();
}
private static final long serialVersionUID = 0;
}
Object writeReplace() {
return new SerializedForm(this);
}
}