Java Comma Separated List commaDelimitedListToStringArray(String str)

Description

Convert a CSV list into an array of Strings.

License

Apache License

Parameter

Parameter	Description
str	the input String

Return

an array of Strings, or the empty array in case of empty input

Declaration

public static String[] commaDelimitedListToStringArray(String str) 

Method Source Code

//package com.java2s;
/*/*from ww w  .  j  a  va2 s  .co m*/
 * Copyright 2002-2014 the original author or authors.
 *
 * 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.
 */

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

public class Main {
    /**
     * Convert a CSV list into an array of Strings.
     *
     * @param str the input String
     * @return an array of Strings, or the empty array in case of empty input
     */
    public static String[] commaDelimitedListToStringArray(String str) {
        return delimitedListToStringArray(str, ",");
    }

    /**
     * Take a String which is a delimited list and convert it to a String array.
     * <p>A single delimiter can consists of more than one character: It will still
     * be considered as single delimiter string, rather than as bunch of potential
     * delimiter characters - in contrast to {@code tokenizeToStringArray}.
     *
     * @param str       the input String
     * @param delimiter the delimiter between elements (this is a single delimiter,
     *                  rather than a bunch individual delimiter characters)
     * @return an array of the tokens in the list
     */
    public static String[] delimitedListToStringArray(String str, String delimiter) {
        return delimitedListToStringArray(str, delimiter, null);
    }

    /**
     * Take a String which is a delimited list and convert it to a String array.
     * <p>A single delimiter can consists of more than one character: It will still
     * be considered as single delimiter string, rather than as bunch of potential
     * delimiter characters - in contrast to {@code tokenizeToStringArray}.
     *
     * @param str           the input String
     * @param delimiter     the delimiter between elements (this is a single delimiter,
     *                      rather than a bunch individual delimiter characters)
     * @param charsToDelete a set of characters to delete. Useful for deleting unwanted
     *                      line breaks: e.g. "\r\n\f" will delete all new lines and line feeds in a String.
     * @return an array of the tokens in the list
     */
    public static String[] delimitedListToStringArray(String str, String delimiter, String charsToDelete) {
        if (str == null) {
            return new String[0];
        }
        if (delimiter == null) {
            return new String[] { str };
        }
        List<String> result = new ArrayList<String>();
        if ("".equals(delimiter)) {
            for (int i = 0; i < str.length(); i++) {
                result.add(deleteAny(str.substring(i, i + 1), charsToDelete));
            }
        } else {
            int pos = 0;
            int delPos;
            while ((delPos = str.indexOf(delimiter, pos)) != -1) {
                result.add(deleteAny(str.substring(pos, delPos), charsToDelete));
                pos = delPos + delimiter.length();
            }
            if (str.length() > 0 && pos <= str.length()) {
                // Add rest of String, but not in case of empty input.
                result.add(deleteAny(str.substring(pos), charsToDelete));
            }
        }
        return toStringArray(result);
    }

    /**
     * Delete any character in a given String.
     *
     * @param inString      the original String
     * @param charsToDelete a set of characters to delete.
     *                      E.g. "az\n" will delete 'a's, 'z's and new lines.
     * @return the resulting String
     */
    public static String deleteAny(String inString, String charsToDelete) {
        if (!hasLength(inString) || !hasLength(charsToDelete)) {
            return inString;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < inString.length(); i++) {
            char c = inString.charAt(i);
            if (charsToDelete.indexOf(c) == -1) {
                sb.append(c);
            }
        }
        return sb.toString();
    }

    /**
     * Copy the given Collection into a String array.
     * The Collection must contain String elements only.
     *
     * @param collection the Collection to copy
     * @return the String array ({@code null} if the passed-in
     * Collection was {@code null})
     */
    public static String[] toStringArray(Collection<String> collection) {
        if (collection == null) {
            return null;
        }
        return collection.toArray(new String[collection.size()]);
    }

    /**
     * Check that the given CharSequence is neither {@code null} nor of length 0.
     * Note: Will return {@code true} for a CharSequence that purely consists of whitespace.
     * <p><pre class="code">
     * StringUtils.hasLength(null) = false
     * StringUtils.hasLength("") = false
     * StringUtils.hasLength(" ") = true
     * StringUtils.hasLength("Hello") = true
     * </pre>
     *
     * @param str the CharSequence to check (may be {@code null})
     * @return {@code true} if the CharSequence is not null and has length
     */
    public static boolean hasLength(CharSequence str) {
        return (str != null && str.length() > 0);
    }

    /**
     * Check that the given String is neither {@code null} nor of length 0.
     * Note: Will return {@code true} for a String that purely consists of whitespace.
     *
     * @param str the String to check (may be {@code null})
     * @return {@code true} if the String is not null and has length
     * @see #hasLength(CharSequence)
     */
    public static boolean hasLength(String str) {
        return hasLength((CharSequence) str);
    }
}

Related

1. addMultiLine(String multiLine, List commandsList)
2. addPropertyToCommand(List command, String key, String value)
3. commaDelimitedListToStringArray(final String str)
4. commaDelimitedListToStringArray(String str)
5. commaDelimitedListToStringArray(String str)
6. commaDelimitedListToStringArray(String str)
7. commaDelimitedStringToList(String str)
8. commaDelimitedToList(String commaDelimited)
9. commalist(List l)