Java String to List toList(String str)

Description

to List

License

LGPL

Declaration

public static List<String> toList(String str) 

Method Source Code

//package com.java2s;
//License from project: LGPL 

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

public class Main {
    private static final int INITIAL_STRING_SIZE = 128;
    public static final char DEFAULT_SEPARATOR = ',';
    public static final char DEFAULT_ESCAPE_CHAR = '\\';

    public static List<String> toList(String str) {
        return toList(str, DEFAULT_SEPARATOR, DEFAULT_ESCAPE_CHAR);
    }//from w ww .  j av a2 s.  c  om

    public static List<String> toList(String str, char sep) {
        return toList(str, sep, DEFAULT_ESCAPE_CHAR);
    }

    public static List<String> toList(String str, char sep, char esc) {
        if (sep == esc)
            throw new IllegalArgumentException("separator and escape char are equal");
        if (str == null)
            return null;
        if (str.isEmpty())
            return Collections.emptyList();

        List<String> list = new ArrayList<String>();

        StringBuilder strBuilder = new StringBuilder(INITIAL_STRING_SIZE);
        boolean isEscape = false;
        final int nrChars = str.length();
        for (int j = 0; j < nrChars; ++j) {
            char c = str.charAt(j);
            if (!isEscape) {
                if (c == esc) {
                    if (j + 1 < nrChars) {
                        char cnext = str.charAt(j + 1);
                        if (cnext != sep && cnext != esc)
                            strBuilder.append(c);
                        else
                            isEscape = true;
                    } else {
                        strBuilder.append(c);
                    }
                } else if (c == sep) {
                    list.add(strBuilder.toString().trim());
                    strBuilder.setLength(0);
                } else {
                    strBuilder.append(c);
                }
            } else {
                strBuilder.append(c);
                isEscape = false;
            }
        }
        list.add(strBuilder.toString().trim());

        return list;
    }

    public static String toString(List<?> list) {
        return toString(list, DEFAULT_SEPARATOR, DEFAULT_ESCAPE_CHAR);
    }

    public static String toString(List<?> list, char sep) {
        return toString(list, sep, DEFAULT_ESCAPE_CHAR);
    }

    public static String toString(List<?> list, char sep, char esc) {
        if (sep == esc)
            throw new IllegalArgumentException("separator and escape char are equal");
        if (list == null)
            return null;

        StringBuilder strBuilder = new StringBuilder(INITIAL_STRING_SIZE);
        final int size = list.size();
        for (int i = 0; i < size; ++i) {
            if (i > 0)
                strBuilder.append(sep);
            Object obj = list.get(i);
            if (obj != null) {
                String str = obj.toString();
                if (str != null) {
                    final int nrChars = str.length();
                    for (int j = 0; j < nrChars; ++j) {
                        char c = str.charAt(j);
                        if (c == sep || c == esc)
                            strBuilder.append(esc);
                        strBuilder.append(c);
                    }
                }
            }
        }
        return strBuilder.toString();
    }
}

Related

1. strToList(String value)
2. toList(String list)
3. toList(String s)
4. toList(String s, String delim)
5. toList(String s, String delimiter)
6. toList(String str)
7. toList(String string)
8. toList(String text)
9. toList(String transaction)