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The Java operations layer for the MongoDB Java Driver. Third parties can wrap this layer to provide custom higher-level APIs
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/*
 * 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.model;

import com.mongodb.lang.Nullable;
import org.bson.BsonString;
import org.bson.BsonValue;
import org.bson.conversions.Bson;

import java.util.concurrent.TimeUnit;

import static com.mongodb.assertions.Assertions.notNull;

/**
 * The options for a count operation.
 *
 * @since 3.0
 * @mongodb.driver.manual reference/command/count/ Count
 */
public class CountOptions {
    private Bson hint;
    private String hintString;
    private int limit;
    private int skip;
    private long maxTimeMS;
    private Collation collation;
    private BsonValue comment;

    /**
     * Gets the hint to apply.
     *
     * @return the hint, which should describe an existing
     */
    @Nullable
    public Bson getHint() {
        return hint;
    }

    /**
     * Gets the hint string to apply.
     *
     * @return the hint string, which should be the name of an existing index
     */
    @Nullable
    public String getHintString() {
        return hintString;
    }

    /**
     * Sets the hint to apply.
     *
     * @param hint a document describing the index which should be used for this operation.
     * @return this
     */
    public CountOptions hint(@Nullable final Bson hint) {
        this.hint = hint;
        return this;
    }

    /**
     * Sets the hint to apply.
     *
     * Note: If {@link CountOptions#hint(Bson)} is set that will be used instead of any hint string.
     *
     * @param hint the name of the index which should be used for the operation
     * @return this
     */
    public CountOptions hintString(@Nullable final String hint) {
        this.hintString = hint;
        return this;
    }

    /**
     * Gets the limit to apply.  The default is 0, which means there is no limit.
     *
     * @return the limit
     * @mongodb.driver.manual reference/method/cursor.limit/#cursor.limit Limit
     */
    public int getLimit() {
        return limit;
    }

    /**
     * Sets the limit to apply.
     *
     * @param limit the limit
     * @return this
     * @mongodb.driver.manual reference/method/cursor.limit/#cursor.limit Limit
     */
    public CountOptions limit(final int limit) {
        this.limit = limit;
        return this;
    }

    /**
     * Gets the number of documents to skip.  The default is 0.
     *
     * @return the number of documents to skip
     * @mongodb.driver.manual reference/method/cursor.skip/#cursor.skip Skip
     */
    public int getSkip() {
        return skip;
    }

    /**
     * Sets the number of documents to skip.
     *
     * @param skip the number of documents to skip
     * @return this
     * @mongodb.driver.manual reference/method/cursor.skip/#cursor.skip Skip
     */
    public CountOptions skip(final int skip) {
        this.skip = skip;
        return this;
    }

    /**
     * Gets the maximum execution time on the server for this operation.  The default is 0, which places no limit on the execution time.
     *
     * @param timeUnit the time unit to return the result in
     * @return the maximum execution time in the given time unit
     */
    public long getMaxTime(final TimeUnit timeUnit) {
        notNull("timeUnit", timeUnit);
        return timeUnit.convert(maxTimeMS, TimeUnit.MILLISECONDS);
    }

    /**
     * Sets the maximum execution time on the server for this operation.
     *
     * @param maxTime  the max time
     * @param timeUnit the time unit, which may not be null
     * @return this
     */
    public CountOptions maxTime(final long maxTime, final TimeUnit timeUnit) {
        notNull("timeUnit", timeUnit);
        this.maxTimeMS = TimeUnit.MILLISECONDS.convert(maxTime, timeUnit);
        return this;
    }

    /**
     * Returns the collation options
     *
     * @return the collation options
     * @since 3.4
     * @mongodb.server.release 3.4
     */
    @Nullable
    public Collation getCollation() {
        return collation;
    }

    /**
     * Sets the collation options
     *
     * A null value represents the server default.
     * @param collation the collation options to use
     * @return this
     * @since 3.4
     * @mongodb.server.release 3.4
     */
    public CountOptions collation(@Nullable final Collation collation) {
        this.collation = collation;
        return this;
    }

    /**
     * @return the comment for this operation. A null value means no comment is set.
     * @since 4.6
     * @mongodb.server.release 4.4
     */
    @Nullable
    public BsonValue getComment() {
        return comment;
    }

    /**
     * Sets the comment for this operation. A null value means no comment is set.
     *
     * @param comment the comment
     * @return this
     * @since 4.6
     * @mongodb.server.release 4.4
     */
    public CountOptions comment(@Nullable final String comment) {
        this.comment = comment == null ? null : new BsonString(comment);
        return this;
    }

    /**
     * Sets the comment for this operation. A null value means no comment is set.
     *
     * @param comment the comment
     * @return this
     * @since 4.6
     * @mongodb.server.release 4.4
     */
    public CountOptions comment(@Nullable final BsonValue comment) {
        this.comment = comment;
        return this;
    }

    @Override
    public String toString() {
        return "CountOptions{"
                + "hint=" + hint
                + ", hintString='" + hintString + '\''
                + ", limit=" + limit
                + ", skip=" + skip
                + ", maxTimeMS=" + maxTimeMS
                + ", collation=" + collation
                + ", comment=" + comment
                + '}';
    }
}