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ImmutableEmptyMapWithHashingStrategy.java
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ImmutableEmptyMapWithHashingStrategy.java
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/*
* Copyright (c) 2016 Goldman Sachs.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Eclipse Distribution License v. 1.0 which accompany this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*/
package org.eclipse.collections.impl.map.strategy.immutable;
import java.io.Serializable;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
import org.eclipse.collections.api.RichIterable;
import org.eclipse.collections.api.block.HashingStrategy;
import org.eclipse.collections.api.block.function.Function;
import org.eclipse.collections.api.block.function.Function0;
import org.eclipse.collections.api.block.function.Function2;
import org.eclipse.collections.api.block.predicate.Predicate2;
import org.eclipse.collections.api.block.procedure.Procedure;
import org.eclipse.collections.api.block.procedure.Procedure2;
import org.eclipse.collections.api.block.procedure.primitive.ObjectIntProcedure;
import org.eclipse.collections.api.factory.Lists;
import org.eclipse.collections.api.factory.Maps;
import org.eclipse.collections.api.factory.Sets;
import org.eclipse.collections.api.map.ImmutableMap;
import org.eclipse.collections.api.tuple.Pair;
import org.eclipse.collections.impl.map.immutable.AbstractImmutableMap;
import org.eclipse.collections.impl.utility.LazyIterate;
/**
* This is a zero element {@link ImmutableUnifiedMapWithHashingStrategy} which is created by calling
* the HashingStrategyMaps.immutable.empty() method.
*/
final class ImmutableEmptyMapWithHashingStrategy<K, V>
extends AbstractImmutableMap<K, V>
implements Serializable
{
private static final long serialVersionUID = 1L;
private final HashingStrategy<? super K> hashingStrategy;
ImmutableEmptyMapWithHashingStrategy(HashingStrategy<? super K> hashingStrategy)
{
this.hashingStrategy = hashingStrategy;
}
@Override
public int size()
{
return 0;
}
@Override
public RichIterable<K> keysView()
{
return LazyIterate.empty();
}
@Override
public RichIterable<V> valuesView()
{
return LazyIterate.empty();
}
@Override
public RichIterable<Pair<K, V>> keyValuesView()
{
return LazyIterate.empty();
}
@Override
public boolean containsKey(Object key)
{
return false;
}
@Override
public boolean containsValue(Object value)
{
return false;
}
@Override
public V get(Object key)
{
return null;
}
@Override
public Set<K> keySet()
{
return Sets.immutable.<K>of().castToSet();
}
@Override
public Collection<V> values()
{
return Lists.immutable.<V>empty().castToList();
}
@Override
public String toString()
{
return "{}";
}
@Override
public boolean equals(Object other)
{
if (!(other instanceof Map))
{
return false;
}
return ((Map<K, V>) other).isEmpty();
}
@Override
public int hashCode()
{
return 0;
}
@Override
public ImmutableMap<V, K> flipUniqueValues()
{
return Maps.immutable.with();
}
@Override
public void forEachKeyValue(Procedure2<? super K, ? super V> procedure)
{
}
@Override
public void forEachKey(Procedure<? super K> procedure)
{
}
@Override
public void forEachValue(Procedure<? super V> procedure)
{
}
@Override
public void forEachWithIndex(ObjectIntProcedure<? super V> objectIntProcedure)
{
}
@Override
public <P> void forEachWith(Procedure2<? super V, ? super P> procedure, P parameter)
{
}
@Override
public boolean isEmpty()
{
return true;
}
@Override
public boolean notEmpty()
{
return false;
}
@Override
public <A> A ifPresentApply(K key, Function<? super V, ? extends A> function)
{
return null;
}
@Override
public V getIfAbsent(K key, Function0<? extends V> function)
{
return function.value();
}
@Override
public V getIfAbsentValue(K key, V value)
{
return value;
}
@Override
public <P> V getIfAbsentWith(
K key,
Function<? super P, ? extends V> function,
P parameter)
{
return function.valueOf(parameter);
}
@Override
public <K2, V2> ImmutableMap<K2, V2> collect(Function2<? super K, ? super V, Pair<K2, V2>> function)
{
return Maps.immutable.empty();
}
@Override
public <R> ImmutableMap<K, R> collectValues(Function2<? super K, ? super V, ? extends R> function)
{
return new ImmutableEmptyMapWithHashingStrategy<>(this.hashingStrategy);
}
@Override
public Pair<K, V> detect(Predicate2<? super K, ? super V> predicate)
{
return null;
}
@Override
public ImmutableMap<K, V> reject(Predicate2<? super K, ? super V> predicate)
{
return this;
}
@Override
public ImmutableMap<K, V> select(Predicate2<? super K, ? super V> predicate)
{
return this;
}
@Override
public V getOnly()
{
throw new IllegalStateException("Size must be 1 but was " + this.size());
}
private Object writeReplace()
{
return new ImmutableMapWithHashingStrategySerializationProxy<>(this, this.hashingStrategy);
}
}