com.b2international.collections.longs.LongKeyMapWrapper.java Source code

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Here is the source code for com.b2international.collections.longs.LongKeyMapWrapper.java

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/*
 * Copyright 2011-2016 B2i Healthcare Pte Ltd, http://b2i.sg
 * 
 * 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.b2international.collections.longs;

import java.util.Collection;

import com.google.common.hash.HashFunction;
import com.google.common.primitives.Longs;

import it.unimi.dsi.fastutil.longs.Long2ObjectMap;
import it.unimi.dsi.fastutil.longs.Long2ObjectOpenCustomHashMap;
import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;

/**
 * @since 4.7
 */
public final class LongKeyMapWrapper<V> implements LongKeyMap<V> {

    private final Long2ObjectMap<V> delegate;

    LongKeyMapWrapper(Long2ObjectMap<V> delegate) {
        this.delegate = delegate;
    }

    @Override
    public int hashCode() {
        int h = 0;
        final LongIterator i = keySet().iterator();
        while (i.hasNext()) {
            long key = i.next();
            V value = get(key);
            h += Longs.hashCode(key) ^ (value == null ? 0 : value.hashCode());
        }
        return h;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (!(obj instanceof LongKeyMap))
            return false;

        final LongKeyMap<?> other = (LongKeyMap<?>) obj;
        if (other.size() != size())
            return false;

        final LongIterator i = keySet().iterator();
        while (i.hasNext()) {
            long key = i.next();
            V value = get(key);
            if (value == null) {
                if (!(other.get(key) == null && other.containsKey(key)))
                    return false;
            } else {
                if (!value.equals(other.get(key))) {
                    return false;
                }
            }
        }

        return true;
    }

    @Override
    public void clear() {
        delegate.clear();
    }

    @Override
    public boolean isEmpty() {
        return delegate.isEmpty();
    }

    @Override
    public int size() {
        return delegate.size();
    }

    @Override
    public void trimToSize() {
        trim(delegate);
    }

    @Override
    public boolean containsKey(long key) {
        return delegate.containsKey(key);
    }

    @Override
    public V get(long key) {
        return delegate.get(key);
    }

    @Override
    public LongSet keySet() {
        return LongSetWrapper.wrap(delegate.keySet());
    }

    @Override
    public V put(long key, V value) {
        return delegate.put(key, value);
    }

    @Override
    public V remove(long key) {
        return delegate.remove(key);
    }

    @Override
    public Collection<V> values() {
        return delegate.values();
    }

    public static <V> LongKeyMap<V> create(LongKeyMap<V> map) {
        if (map instanceof LongKeyMapWrapper) {
            final Long2ObjectMap<V> sourceDelegate = ((LongKeyMapWrapper<V>) map).delegate;
            return new LongKeyMapWrapper<>(clone(sourceDelegate));
        } else {
            final LongKeyMap<V> result = createWithExpectedSize(map.size());
            final LongIterator iter = map.keySet().iterator();
            while (iter.hasNext()) {
                final long key = iter.next();
                result.put(key, map.get(key));
            }
            return result;
        }
    }

    public static <V> LongKeyMap<V> create(HashFunction hashFunction) {
        return new LongKeyMapWrapper<>(
                new Long2ObjectOpenCustomHashMap<V>(new LongHashStrategyWrapper(hashFunction)));
    }

    public static <V> LongKeyMap<V> createWithExpectedSize(int expectedSize) {
        return new LongKeyMapWrapper<>(new Long2ObjectOpenHashMap<V>(expectedSize));
    }

    public static <V> LongKeyMap<V> create() {
        return new LongKeyMapWrapper<>(new Long2ObjectOpenHashMap<V>());
    }

    // Move to FastUtil helper methods
    private static <V> Long2ObjectMap<V> clone(Long2ObjectMap<V> sourceDelegate) {
        if (sourceDelegate instanceof Long2ObjectOpenHashMap) {
            return ((Long2ObjectOpenHashMap<V>) sourceDelegate).clone();
        } else if (sourceDelegate instanceof Long2ObjectOpenCustomHashMap) {
            return ((Long2ObjectOpenCustomHashMap<V>) sourceDelegate).clone();
        } else {
            throw new UnsupportedOperationException(
                    "Unsupported map implementation: " + sourceDelegate.getClass().getSimpleName());
        }
    }

    private static <V> void trim(Long2ObjectMap<V> map) {
        if (map instanceof Long2ObjectOpenHashMap) {
            ((Long2ObjectOpenHashMap<V>) map).trim();
        } else if (map instanceof Long2ObjectOpenCustomHashMap) {
            ((Long2ObjectOpenCustomHashMap<V>) map).trim();
        } else {
            throw new UnsupportedOperationException(
                    "Unsupported map implementation: " + map.getClass().getSimpleName());
        }
    }

}