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Neo4j kernel is a lightweight, embedded Java database designed to store data structured as graphs rather than tables. For more information, see http://neo4j.org.

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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.kernel.impl.api.index;

import org.eclipse.collections.api.block.procedure.primitive.LongObjectProcedure;
import org.eclipse.collections.api.iterator.LongIterator;
import org.eclipse.collections.api.map.primitive.MutableLongObjectMap;
import org.eclipse.collections.impl.map.mutable.primitive.LongObjectHashMap;

import org.neo4j.internal.schema.IndexDescriptor;
import org.neo4j.util.Preconditions;

/**
 * Bundles various mappings to IndexProxy. Used by IndexingService via IndexMapReference.
 *
 * IndexingService is expected to either make a copy before making any changes or update this
 * while being single threaded.
 */
public final class IndexMap
{
    private final MutableLongObjectMap indexesById;

    public IndexMap()
    {
        this( new LongObjectHashMap<>() );
    }

    IndexMap( MutableLongObjectMap indexesById )
    {
        this.indexesById = indexesById;
    }

    IndexMap( IndexMap other )
    {
        this( LongObjectHashMap.newMap( other.indexesById ) );
    }

    public IndexProxy getIndexProxy( IndexDescriptor index )
    {
        return indexesById.get( index.getId() );
    }

    public IndexProxy getIndexProxy( long indexId )
    {
        return indexesById.get( indexId );
    }

    public void putIndexProxy( IndexProxy indexProxy )
    {
        IndexDescriptor index = indexProxy.getDescriptor();
        Preconditions.checkState( !indexesById.contains( index.getId() ), "Trying to overwrite index %d in IndexMap", index.getId() );
        indexesById.put( index.getId(), indexProxy );
    }

    IndexProxy removeIndexProxy( long indexId )
    {
        return indexesById.remove( indexId );
    }

    void forEachIndexProxy( LongObjectProcedure consumer )
    {
        indexesById.forEachKeyValue( consumer );
    }

    Iterable getAllIndexProxies()
    {
        return indexesById.values();
    }

    public LongIterator indexIds()
    {
        return indexesById.keySet().longIterator();
    }

    public int size()
    {
        return indexesById.size();
    }
}