Java String Split split(String str)

Description

split

License

Open Source License

Declaration

public static String[] split(String str) 

Method Source Code

//package com.java2s;
/**//from  ww w . j  a  v  a  2 s . c o  m
 *  ETRI Distributed Resource/Mediation System for new re-generation Energy Exchange
 *
 *  Copyright ? [2016] ETRI. All rights reserved.
 *
 *    This is a proprietary software of ETRI, and you may not use this file except in
 *  compliance with license agreement with ETRI. Any redistribution or use of this
 *  software, with or without modification shall be strictly prohibited without prior written
 *  approval of ETRI, and the copyright notice above does not evidence any actual or
 *  intended publication of such software.
 *
 * com.nc.common.utils : StringUtil.java
 * @author creme55
 * @since 2016. 10. 12.
 * @version 1.0
 * @see 
 * @Copyright ? [2016] By ETRI. All rights reserved.
 *
 * <pre>
 * << ??????(Modification Information) >>
 *      ?????              ????                  ????
 *  -------------        -----------       -------------------------
 *  2016. 10. 12.          creme55         ?? ???(???? ?? ????)              
 *
 * </pre>
 **/

import java.util.ArrayList;

import java.util.List;

public class Main {
    public static final String EMPTY = "";

    public static String[] split(String str) {
        return split(str, null, -1);
    }

    @SuppressWarnings({ "rawtypes", "unchecked" })
    public static String[] split(String str, char separatorChar) {
        // Performance tuned for 2.0 (JDK1.4)

        if (str == null) {
            return null;
        }
        int len = str.length();
        if (len == 0) {
            return new String[0];
        }
        List list = new ArrayList();
        int i = 0, start = 0;
        boolean match = false;
        while (i < len) {
            if (str.charAt(i) == separatorChar) {
                if (match) {
                    list.add(str.substring(start, i));
                    match = false;
                }
                start = ++i;
                continue;
            }
            match = true;
            i++;
        }
        if (match) {
            list.add(str.substring(start, i));
        }
        return (String[]) list.toArray(new String[list.size()]);
    }

    public static String[] split(String str, String separatorChars) {
        return split(str, separatorChars, -1);
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static String[] split(String str, String separatorChars, int max) {

        if (str == null) {
            return null;
        }
        int len = str.length();
        if (len == 0) {
            return new String[0];
        }
        List list = new ArrayList();
        int sizePlus1 = 1;
        int i = 0, start = 0;
        boolean match = false;
        if (separatorChars == null) {
            // Null separator means use whitespace
            while (i < len) {
                if (Character.isWhitespace(str.charAt(i))) {
                    if (match) {
                        if (sizePlus1++ == max) {
                            i = len;
                        }
                        list.add(str.substring(start, i));
                        match = false;
                    }
                    start = ++i;
                    continue;
                }
                match = true;
                i++;
            }
        } else if (separatorChars.length() == 1) {
            // Optimise 1 character case
            char sep = separatorChars.charAt(0);
            while (i < len) {
                if (str.charAt(i) == sep) {
                    if (match) {
                        if (sizePlus1++ == max) {
                            i = len;
                        }
                        list.add(str.substring(start, i));
                        match = false;
                    }
                    start = ++i;
                    continue;
                }
                match = true;
                i++;
            }
        } else {
            // standard case
            while (i < len) {
                if (separatorChars.indexOf(str.charAt(i)) >= 0) {
                    if (match) {
                        if (sizePlus1++ == max) {
                            i = len;
                        }
                        list.add(str.substring(start, i));
                        match = false;
                    }
                    start = ++i;
                    continue;
                }
                match = true;
                i++;
            }
        }
        if (match) {
            list.add(str.substring(start, i));
        }
        return (String[]) list.toArray(new String[list.size()]);
    }

    public static String substring(String str, int start) {
        if (str == null) {
            return null;
        }

        // handle negatives, which means last n characters
        if (start < 0) {
            start = str.length() + start; // remember start is negative
        }

        if (start < 0) {
            start = 0;
        }
        if (start > str.length()) {
            return EMPTY;
        }

        return str.substring(start);
    }

    public static String substring(String str, int start, int end) {
        if (str == null) {
            return null;
        }

        // handle negatives
        if (end < 0) {
            end = str.length() + end; // remember end is negative
        }
        if (start < 0) {
            start = str.length() + start; // remember start is negative
        }

        // check length next
        if (end > str.length()) {
            end = str.length();
        }

        // if start is greater than end, return ""
        if (start > end) {
            return EMPTY;
        }

        if (start < 0) {
            start = 0;
        }
        if (end < 0) {
            end = 0;
        }

        return str.substring(start, end);
    }

    public static boolean isWhitespace(String str) {
        if (str == null) {
            return false;
        }
        int sz = str.length();
        for (int i = 0; i < sz; i++) {
            if ((Character.isWhitespace(str.charAt(i)) == false)) {
                return false;
            }
        }
        return true;
    }

    public static int indexOf(String str, char searchChar) {
        if (str == null || str.length() == 0) {
            return -1;
        }
        return str.indexOf(searchChar);
    }

    public static int indexOf(String str, char searchChar, int startPos) {
        if (str == null || str.length() == 0) {
            return -1;
        }
        return str.indexOf(searchChar, startPos);
    }

    public static int indexOf(String str, String searchStr) {
        if (str == null || searchStr == null) {
            return -1;
        }
        return str.indexOf(searchStr);
    }

    public static int indexOf(String str, String searchStr, int startPos) {
        if (str == null || searchStr == null) {
            return -1;
        }

        if (searchStr.length() == 0 && startPos >= str.length()) {
            return str.length();
        }
        return str.indexOf(searchStr, startPos);
    }
}

Related

1. split(String s, String splitStr)
2. split(String s, String splitter)
3. split(String self)
4. split(String signature, boolean skipInitialAngleBracket)
5. split(String source, String seperator)
6. split(String str)
7. split(String str)
8. split(String str)
9. split(String str)