/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
 *
 *      https://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.apache.commons.lang3;

import static org.apache.commons.lang3.StringUtils.INDEX_NOT_FOUND;

import org.apache.commons.lang3.builder.AbstractSupplier;
import org.apache.commons.lang3.function.ToBooleanBiFunction;

/**
 * String operations where you choose case-sensitive {@link #CS} vs. case-insensitive {@link #CI} through a singleton instance.
 *
 * @see CharSequenceUtils
 * @see StringUtils
 * @since 3.18.0
 */
public abstract class Strings {

    /**
     * Builds {@link Strings} instances.
     */
    public static class Builder extends AbstractSupplier<Strings, Builder, RuntimeException> {

        /**
         * Ignores case when possible.
         */
        private boolean ignoreCase;

        /**
         * Compares null as less when possible.
         */
        private boolean nullIsLess;

        /**
         * Constructs a new instance.
