jersey.repackaged.com.google.common.collect.RegularImmutableBiMap Maven / Gradle / Ivy
/*
* 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 jersey.repackaged.com.google.common.collect;
import static jersey.repackaged.com.google.common.base.Preconditions.checkNotNull;
import jersey.repackaged.com.google.common.annotations.GwtCompatible;
import java.io.Serializable;
import java.util.Collection;
import javax.annotation.Nullable;
/**
* Bimap with two or more mappings.
*
* @author Louis Wasserman
*/
@GwtCompatible(serializable = true, emulated = true)
@SuppressWarnings("serial") // uses writeReplace(), not default serialization
class RegularImmutableBiMap extends ImmutableBiMap {
private static class BiMapEntry extends ImmutableEntry {
BiMapEntry(K key, V value) {
super(key, value);
}
@Nullable
BiMapEntry getNextInKToVBucket() {
return null;
}
@Nullable
BiMapEntry getNextInVToKBucket() {
return null;
}
}
private static class NonTerminalBiMapEntry extends BiMapEntry {
@Nullable private final BiMapEntry nextInKToVBucket;
@Nullable private final BiMapEntry nextInVToKBucket;
NonTerminalBiMapEntry(K key, V value, @Nullable BiMapEntry nextInKToVBucket,
@Nullable BiMapEntry nextInVToKBucket) {
super(key, value);
this.nextInKToVBucket = nextInKToVBucket;
this.nextInVToKBucket = nextInVToKBucket;
}
@Override
@Nullable
BiMapEntry getNextInKToVBucket() {
return nextInKToVBucket;
}
@Override
@Nullable
BiMapEntry getNextInVToKBucket() {
return nextInVToKBucket;
}
}
static final double MAX_LOAD_FACTOR = 1.2;
private transient final BiMapEntry[] kToVTable;
private transient final BiMapEntry[] vToKTable;
private transient final BiMapEntry[] entries;
private transient final int mask;
private transient final int hashCode;
RegularImmutableBiMap(Collection> entriesToAdd) {
int n = entriesToAdd.size();
int tableSize = Hashing.closedTableSize(n, MAX_LOAD_FACTOR);
this.mask = tableSize - 1;
BiMapEntry[] kToVTable = createEntryArray(tableSize);
BiMapEntry[] vToKTable = createEntryArray(tableSize);
BiMapEntry[] entries = createEntryArray(n);
int i = 0;
int hashCode = 0;
for (Entry entry : entriesToAdd) {
K key = checkNotNull(entry.getKey());
V value = checkNotNull(entry.getValue());
int keyHash = key.hashCode();
int valueHash = value.hashCode();
int keyBucket = Hashing.smear(keyHash) & mask;
int valueBucket = Hashing.smear(valueHash) & mask;
BiMapEntry nextInKToVBucket = kToVTable[keyBucket];
for (BiMapEntry kToVEntry = nextInKToVBucket; kToVEntry != null;
kToVEntry = kToVEntry.getNextInKToVBucket()) {
if (key.equals(kToVEntry.getKey())) {
throw new IllegalArgumentException("Multiple entries with same key: " +
entry + " and " + kToVEntry);
}
}
BiMapEntry nextInVToKBucket = vToKTable[valueBucket];
for (BiMapEntry vToKEntry = nextInVToKBucket; vToKEntry != null;
vToKEntry = vToKEntry.getNextInVToKBucket()) {
if (value.equals(vToKEntry.getValue())) {
throw new IllegalArgumentException("Multiple entries with same value: "
+ entry + " and " + vToKEntry);
}
}
BiMapEntry newEntry =
(nextInKToVBucket == null && nextInVToKBucket == null)
? new BiMapEntry(key, value)
: new NonTerminalBiMapEntry(key, value, nextInKToVBucket, nextInVToKBucket);
kToVTable[keyBucket] = newEntry;
vToKTable[valueBucket] = newEntry;
entries[i++] = newEntry;
hashCode += keyHash ^ valueHash;
}
this.kToVTable = kToVTable;
this.vToKTable = vToKTable;
this.entries = entries;
this.hashCode = hashCode;
}
@SuppressWarnings("unchecked")
private static BiMapEntry[] createEntryArray(int length) {
return new BiMapEntry[length];
}
@Override
@Nullable
public V get(@Nullable Object key) {
if (key == null) {
return null;
}
int bucket = Hashing.smear(key.hashCode()) & mask;
for (BiMapEntry entry = kToVTable[bucket]; entry != null;
entry = entry.getNextInKToVBucket()) {
if (key.equals(entry.getKey())) {
return entry.getValue();
}
}
return null;
}
@Override
ImmutableSet> createEntrySet() {
return new ImmutableMapEntrySet() {
@Override
ImmutableMap map() {
return RegularImmutableBiMap.this;
}
@Override
public UnmodifiableIterator> iterator() {
return asList().iterator();
}
@Override
ImmutableList> createAsList() {
return new RegularImmutableAsList>(this, entries);
}
@Override
boolean isHashCodeFast() {
return true;
}
@Override
public int hashCode() {
return hashCode;
}
};
}
@Override
boolean isPartialView() {
return false;
}
@Override
public int size() {
return entries.length;
}
private transient ImmutableBiMap inverse;
@Override
public ImmutableBiMap inverse() {
ImmutableBiMap result = inverse;
return (result == null) ? inverse = new Inverse() : result;
}
private final class Inverse extends ImmutableBiMap {
@Override
public int size() {
return inverse().size();
}
@Override
public ImmutableBiMap inverse() {
return RegularImmutableBiMap.this;
}
@Override
public K get(@Nullable Object value) {
if (value == null) {
return null;
}
int bucket = Hashing.smear(value.hashCode()) & mask;
for (BiMapEntry entry = vToKTable[bucket]; entry != null;
entry = entry.getNextInVToKBucket()) {
if (value.equals(entry.getValue())) {
return entry.getKey();
}
}
return null;
}
@Override
ImmutableSet> createEntrySet() {
return new InverseEntrySet();
}
final class InverseEntrySet extends ImmutableMapEntrySet {
@Override
ImmutableMap map() {
return Inverse.this;
}
@Override
boolean isHashCodeFast() {
return true;
}
@Override
public int hashCode() {
return hashCode;
}
@Override
public UnmodifiableIterator> iterator() {
return asList().iterator();
}
@Override
ImmutableList> createAsList() {
return new ImmutableAsList>() {
@Override
public Entry get(int index) {
Entry entry = entries[index];
return Maps.immutableEntry(entry.getValue(), entry.getKey());
}
@Override
ImmutableCollection> delegateCollection() {
return InverseEntrySet.this;
}
};
}
}
@Override
boolean isPartialView() {
return false;
}
@Override
Object writeReplace() {
return new InverseSerializedForm(RegularImmutableBiMap.this);
}
}
private static class InverseSerializedForm implements Serializable {
private final ImmutableBiMap forward;
InverseSerializedForm(ImmutableBiMap forward) {
this.forward = forward;
}
Object readResolve() {
return forward.inverse();
}
private static final long serialVersionUID = 1;
}
}