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

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Here is the source code for com.b2international.collections.longs.LongKeyLongMapWrapper.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 com.google.common.primitives.Longs;

import it.unimi.dsi.fastutil.longs.Long2LongMap;
import it.unimi.dsi.fastutil.longs.Long2LongOpenCustomHashMap;
import it.unimi.dsi.fastutil.longs.Long2LongOpenHashMap;

/**
 * @since 4.7
 */
public final class LongKeyLongMapWrapper implements LongKeyLongMap {

    private final Long2LongMap delegate;

    LongKeyLongMapWrapper(Long2LongMap delegate) {
        this.delegate = delegate;
    }

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

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

        final LongKeyLongMap other = (LongKeyLongMap) obj;
        if (other.size() != size())
            return false;

        final LongIterator i = keySet().iterator();
        while (i.hasNext()) {
            long key = i.next();
            long value = get(key);
            if (value != 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 long get(long key) {
        return delegate.get(key);
    }

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

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

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

    @Override
    public LongCollection values() {
        return LongCollectionWrapper.wrap(delegate.values());
    }

    public static LongKeyLongMap create(LongKeyLongMap map) {
        if (map instanceof LongKeyLongMapWrapper) {
            final Long2LongMap sourceDelegate = ((LongKeyLongMapWrapper) map).delegate;
            return new LongKeyLongMapWrapper(clone(sourceDelegate));
        } else {
            final LongKeyLongMap result = createWithExpectedSize(map.size());
            final LongIterator keys = map.keySet().iterator();
            while (keys.hasNext()) {
                final long key = keys.next();
                result.put(key, map.get(key));
            }
            return result;
        }
    }

    public static LongKeyLongMap create() {
        return new LongKeyLongMapWrapper(new Long2LongOpenHashMap());
    }

    public static LongKeyLongMap createWithExpectedSize(int expectedSize) {
        return new LongKeyLongMapWrapper(new Long2LongOpenHashMap(expectedSize));
    }

    // FastUtil helpers

    private static Long2LongMap clone(Long2LongMap map) {
        if (map instanceof Long2LongOpenHashMap) {
            return ((Long2LongOpenHashMap) map).clone();
        } else if (map instanceof Long2LongOpenCustomHashMap) {
            return ((Long2LongOpenCustomHashMap) map).clone();
        } else {
            throw new UnsupportedOperationException(
                    "Unsupported map implementation: " + map.getClass().getSimpleName());
        }
    }

    private static void trim(Long2LongMap map) {
        if (map instanceof Long2LongOpenHashMap) {
            ((Long2LongOpenHashMap) map).trim();
        } else if (map instanceof Long2LongOpenCustomHashMap) {
            ((Long2LongOpenCustomHashMap) map).trim();
        } else {
            throw new UnsupportedOperationException(
                    "Unsupported map implementation: " + map.getClass().getSimpleName());
        }
    }

}