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Access to the Neo4j graph database through Java

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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * 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.neo4j.driver.internal.util;

import static java.util.Collections.emptyList;
import static java.util.Collections.emptyMap;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;

public class QueryKeys {
    private static final QueryKeys EMPTY = new QueryKeys(emptyList(), emptyMap());

    private final List keys;
    private final Map keyIndex;

    public QueryKeys(int size) {
        this(new ArrayList<>(size), new HashMap<>(size));
    }

    public QueryKeys(List keys) {
        this.keys = keys;
        Map keyIndex = new HashMap<>(keys.size());
        int i = 0;
        for (String key : keys) {
            keyIndex.put(key, i++);
        }
        this.keyIndex = keyIndex;
    }

    public QueryKeys(List keys, Map keyIndex) {
        this.keys = keys;
        this.keyIndex = keyIndex;
    }

    public void add(String key) {
        int index = keys.size();
        keys.add(key);
        keyIndex.put(key, index);
    }

    public List keys() {
        return keys;
    }

    public Map keyIndex() {
        return keyIndex;
    }

    public static QueryKeys empty() {
        return EMPTY;
    }

    public int indexOf(String key) {
        return keyIndex.getOrDefault(key, -1);
    }

    public boolean contains(String key) {
        return keyIndex.containsKey(key);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        QueryKeys queryKeys = (QueryKeys) o;
        return keys.equals(queryKeys.keys) && keyIndex.equals(queryKeys.keyIndex);
    }

    @Override
    public int hashCode() {
        return Objects.hash(keys, keyIndex);
    }
}