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/**
 * Copyright (c) 2002-2016 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.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.v1;

import org.neo4j.driver.internal.value.NullValue;
import org.neo4j.driver.v1.exceptions.ClientException;

/**
 * Access the keys, properties and values of an underlying unordered map by key
 *
 * This provides only read methods. Subclasses may chose to provide additional methods
 * for changing the underlying map.
 */
public interface MapAccessor
{
    /**
     * Retrieve the keys of the underlying map
     *
     * @return all map keys in unspecified order
     */
    Iterable keys();

    /**
     * Check if the list of keys contains the given key
     *
     * @param key the key
     * @return true if this map keys contains the given key otherwise false
     */
    boolean containsKey( String key );

    /**
     * Retrieve the value of the property with the given key
     *
     * @param key the key of the property
     * @return the property's value or a {@link NullValue} if no such key exists
     * @throws ClientException if record has not been initialized
     */
    Value get( String key );

    /**
     * Retrieve the number of entries in this map
     *
     * @return the number of entries in this map
     */
    int size();

    /**
     * Retrieve all values of the underlying collection
     *
     * @return all values in unspecified order
     */
    Iterable values();

    /**
     * Map and retrieve all values of the underlying collection
     *
     * @param mapFunction a function to map from Value to T. See {@link Values} for some predefined functions, such
     * as {@link Values#valueAsBoolean()}, {@link Values#valueAsList(Function)}.
     * @param  the target type of mapping
     * @return the result of mapping all values in unspecified order
     */
     Iterable values( Function mapFunction );

    /**
     * Retrieve all properties of the underlying map
     *
     * @see Pair
     * @return all properties in unspecified order
     */
    Iterable> properties();

    /**
     * Retrieve all properties of the underlying map
     *
     * @see Pair
     * @param mapFunction a function to map from Value to T. See {@link Values} for some predefined functions, such
     * as {@link Values#valueAsBoolean()}, {@link Values#valueAsList(Function)}.
     * @param  the target type of mapping
     * @return all mapped properties in unspecified order
     */
     Iterable> properties( Function mapFunction );
}