/*
 * Copyright 2008-present MongoDB, Inc.
 *
 * 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.mongodb.client;

import com.mongodb.Block;
import com.mongodb.Function;
import com.mongodb.lang.Nullable;

import java.util.Collection;
import java.util.function.Consumer;

The MongoIterable is the results from an operation, such as a query.
Type parameters:
<TResult> – The type that this iterable will decode documents to.
Since:
3.0/**
 *The MongoIterable is the results from an operation, such as a query.
 *
 * @param <TResult> The type that this iterable will decode documents to.
 * @since 3.0
 */
public interface MongoIterable<TResult> extends Iterable<TResult> {

    @Override
    MongoCursor<TResult> iterator();

    
Returns a cursor used for iterating over elements of type TResult. The cursor is primarily used for change streams. 
Returns:
a cursor
Since:
3.11/**
     * Returns a cursor used for iterating over elements of type {@code TResult}. The cursor is primarily used for change streams.
     *
     * @return a cursor
     * @since 3.11
     */
    MongoCursor<TResult> cursor();

    
Helper to return the first item in the iterator or null.
Returns:
T the first item or null./**
     * Helper to return the first item in the iterator or null.
     *
     * @return T the first item or null.
     */
    @Nullable
    TResult first();

    
Maps this iterable from the source document type to the target document type.
Params:
mapper – a function that maps from the source to the target document type
Type parameters:
<U> – the target document type
Returns:
an iterable which maps T to U/**
     * Maps this iterable from the source document type to the target document type.
     *
     * @param mapper a function that maps from the source to the target document type
     * @param <U> the target document type
     * @return an iterable which maps T to U
     */
    <U> MongoIterable<U> map(Function<TResult, U> mapper);

    
Iterates over all documents in the view, applying the given block to each.
Similar to map but the function is fully encapsulated with no returned result.
Params:
block – the block to apply to each document of type T.
Deprecated:
Prefer Iterable.forEach(Consumer), which was added in Java 8/**
     * Iterates over all documents in the view, applying the given block to each.
     *
     * <p>Similar to {@code map} but the function is fully encapsulated with no returned result.</p>
     *
     * @param block the block to apply to each document of type T.
     * @deprecated Prefer {@link Iterable#forEach(Consumer)}, which was added in Java 8
     */
    @Deprecated
    void forEach(Block<? super TResult> block);

    
Iterates over all the documents, adding each to the given target.
Params:
target – the collection to insert into
Type parameters:
<A> – the collection type
Returns:
the target/**
     * Iterates over all the documents, adding each to the given target.
     *
     * @param target the collection to insert into
     * @param <A> the collection type
     * @return the target
     */
    <A extends Collection<? super TResult>> A into(A target);

    
Sets the number of documents to return per batch.
Params:
batchSize – the batch size
Returns:
this
@mongodb.driver.manual
reference/method/cursor.batchSize/#cursor.batchSize Batch Size/**
     * Sets the number of documents to return per batch.
     *
     * @param batchSize the batch size
     * @return this
     * @mongodb.driver.manual reference/method/cursor.batchSize/#cursor.batchSize Batch Size
     */
    MongoIterable<TResult> batchSize(int batchSize);
}