com.hierynomus.utils.Strings Maven / Gradle / Ivy

/*
 * Copyright (C)2016 - SMBJ Contributors
 *
 * 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.hierynomus.utils;

import com.hierynomus.protocol.commons.Charsets;

import java.util.ArrayList;
import java.util.List;

public class Strings {

    /**
     * Split a string on a character.
     *
     * @param string The string to split.
     * @param c The character to split on.
     * @return The splitted parts of the string.
     */
    public static List split(String string, char c) {
        List parts = new ArrayList<>();
        int off = 0;
        int next;
        while ((next = string.indexOf(c, off)) != -1) {
            parts.add(string.substring(off, next));
            off = next + 1;
        }
        parts.add(string.substring(off));
        return parts;
    }

    /**
     * Join a string on a character.
     *
     * @param strings The strings to join.
     * @param c The character to join on.
     * @return The joined parts of the string.
     */
    public static String join(List strings, char c) {
        StringBuilder joiner = new StringBuilder();
        for (int i = 0; i < strings.size(); i++) {
            if (i > 0) {
                joiner.append(c);
            }
            joiner.append(strings.get(i));
        }
        return joiner.toString();
    }

    /**
     * Return a byte[] of the String including a final null terminator
     * @param s
     * @return
     */
    public static byte[] nullTerminatedBytes(String s) {
        byte[] b = new byte[s.length() + 1];
        System.arraycopy(s.getBytes(Charsets.US_ASCII), 0, b, 0, s.length());
        return b;
    }

    /**
     * Check whether the passed String is not null and not empty (after trim)
     * @param s The string to check
     * @return true iff the string is not blank
     */
    public static boolean isNotBlank(String s) {
        return s != null && !s.trim().isEmpty();
    }

}