com.github.ykrasik.jerminal.internal.util.StringUtils.java Source code

Introduction

Here is the source code for com.github.ykrasik.jerminal.internal.util.StringUtils.java

Source

/******************************************************************************
 * Copyright (C) 2014 Yevgeny Krasik                                          *
 *                                                                            *
 * 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.github.ykrasik.jerminal.internal.util;

import com.google.common.base.Optional;
import com.google.common.base.Strings;

/**
 * Utilities for working with Strings.
 *
 * @author Yevgeny Krasik
 */
public final class StringUtils {
    private StringUtils() {
    }

    /**
     * Removes the leading and trailing delimiter from a string.
     *
     * @param str String to process.
     * @param delimiter Delimiter to remove.
     * @return The string with the leading and trailing delimiter removed.
     */
    public static String removeLeadingAndTrailingDelimiter(String str, String delimiter) {
        final int length = str.length();
        final boolean leadingDelimiter = str.startsWith(delimiter);
        final boolean trailingDelimiter = length > 1 && str.endsWith(delimiter);
        if (!leadingDelimiter && !trailingDelimiter) {
            return str;
        } else {
            final int startingDelimiterIndex = leadingDelimiter ? 1 : 0;
            final int endingDelimiterIndex = trailingDelimiter ? Math.max(length - 1, startingDelimiterIndex)
                    : length;
            return str.substring(startingDelimiterIndex, endingDelimiterIndex);
        }
    }

    /**
     * Transforms an all-whitespace string to an absent value.
     *
     * @param str String to check.
     * @return A present value if the string had any non-whitespace character, or an absent value otherwise.
     */
    public static Optional<String> getOptionalString(String str) {
        return Optional.fromNullable(Strings.emptyToNull(str.trim()));
    }
}