/*
 * 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 <http://www.gnu.org/licenses/>.
 */
package org.neo4j.kernel.impl.api.index;

import java.util.Collection;
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<IndexProxy> indexesById;

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

    IndexMap(MutableLongObjectMap<IndexProxy> 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<IndexProxy> consumer) {
        indexesById.forEachKeyValue(consumer);
    }

    Collection<IndexProxy> getAllIndexProxies() {
        return indexesById.values();
    }

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

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