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73
agrona/src/main/java/org/agrona/collections/Int2NullableObjectHashMap.java
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| /* | ||
| * Copyright 2014-2018 Real Logic Ltd. | ||
| * | ||
| * 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 org.agrona.collections; | ||
|
|
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| import org.agrona.generation.DoNotSub; | ||
|
|
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| /** | ||
| * Variation of {@link Int2ObjectHashMap} that allows {@code null} values. | ||
| * | ||
| * @param <V> type of values stored in the {@link java.util.Map} | ||
| */ | ||
| public class Int2NullableObjectHashMap<V> extends Int2ObjectHashMap<V> | ||
| { | ||
| public Int2NullableObjectHashMap() | ||
| { | ||
| } | ||
|
|
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| public Int2NullableObjectHashMap( | ||
| @DoNotSub final int initialCapacity, | ||
| final float loadFactor) | ||
| { | ||
| super(initialCapacity, loadFactor); | ||
| } | ||
|
|
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| /** | ||
| * Construct a new map allowing a configuration for initial capacity and load factor. | ||
| * @param initialCapacity for the backing array | ||
| * @param loadFactor limit for resizing on puts | ||
| * @param shouldAvoidAllocation should allocation be avoided by caching iterators and map entries. | ||
| */ | ||
| public Int2NullableObjectHashMap( | ||
| @DoNotSub final int initialCapacity, | ||
| final float loadFactor, | ||
| final boolean shouldAvoidAllocation) | ||
| { | ||
| super(initialCapacity, loadFactor, shouldAvoidAllocation); | ||
| } | ||
|
|
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| /** | ||
| * Copy construct a new map from an existing one. | ||
| * | ||
| * @param mapToCopy for construction. | ||
| */ | ||
| public Int2NullableObjectHashMap(final Int2ObjectHashMap<V> mapToCopy) | ||
| { | ||
| super(mapToCopy); | ||
| } | ||
|
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| @Override | ||
| protected Object mapNullValue(final Object value) | ||
| { | ||
| return value == null ? NullReference.INSTANCE : value; | ||
| } | ||
|
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| @Override | ||
| protected V unmapNullValue(final Object value) | ||
| { | ||
| return value == NullReference.INSTANCE ? null : (V)value; | ||
| } | ||
| } |
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31 changes: 31 additions & 0 deletions
31
agrona/src/main/java/org/agrona/collections/NullReference.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| /* | ||
| * Copyright 2014-2018 Real Logic Ltd. | ||
| * | ||
| * 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 org.agrona.collections; | ||
|
|
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| public final class NullReference | ||
| { | ||
| public static final NullReference INSTANCE = new NullReference(); | ||
|
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| public int hashCode() | ||
| { | ||
| return 0; | ||
| } | ||
|
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| public boolean equals(final Object obj) | ||
| { | ||
| return obj == this; | ||
| } | ||
| } |
58 changes: 58 additions & 0 deletions
58
agrona/src/main/java/org/agrona/collections/Object2NullableObjectHashMap.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| /* | ||
| * Copyright 2014-2018 Real Logic Ltd. | ||
| * | ||
| * 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 org.agrona.collections; | ||
|
|
||
| /** | ||
| * Variation of {@link Object2ObjectHashMap} that allows {@code null} values. | ||
| */ | ||
| public class Object2NullableObjectHashMap<K, V> extends Object2ObjectHashMap<K, V> | ||
| { | ||
| public Object2NullableObjectHashMap() | ||
| { | ||
| } | ||
|
|
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| public Object2NullableObjectHashMap( | ||
| final int initialCapacity, | ||
| final float loadFactor) | ||
| { | ||
| super(initialCapacity, loadFactor); | ||
| } | ||
|
|
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| /** | ||
| * @param initialCapacity for the map to override {@link #MIN_CAPACITY} | ||
| * @param loadFactor for the map to override {@link Hashing#DEFAULT_LOAD_FACTOR}. | ||
| * @param shouldAvoidAllocation should allocation be avoided by caching iterators and map entries. | ||
| */ | ||
| public Object2NullableObjectHashMap( | ||
| final int initialCapacity, | ||
| final float loadFactor, | ||
| final boolean shouldAvoidAllocation) | ||
| { | ||
| super(initialCapacity, loadFactor, shouldAvoidAllocation); | ||
| } | ||
|
|
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| @Override | ||
| protected Object mapNullValue(final Object value) | ||
| { | ||
| return value == null ? NullReference.INSTANCE : value; | ||
| } | ||
|
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| @Override | ||
| protected V unmapNullValue(final Object value) | ||
| { | ||
| return value == NullReference.INSTANCE ? null : (V)value; | ||
| } | ||
| } |
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