Java String Split by Separator fastSplit(final String text, char separator)

Description

fast Split

License

Apache License

Declaration

public static List<String> fastSplit(final String text, char separator) 

Method Source Code

//package com.java2s;
/*/*from   w  w  w  .j av a2s  .  c om*/
* Copyright 2015 Bizosys Technologies Limited
*
* Licensed to the Bizosys Technologies Limited (Bizosys) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The Bizosys licenses this file
* to you 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.List;

public class Main {
    public static List<String> fastSplit(final String text, char separator) {
        return fastSplit(null, text, separator);
    }

    public static List<String> fastSplit(List<String> result, final String text, char separator) {
        if (isEmpty(text))
            return null;

        if (null == result)
            result = new ArrayList<String>();
        int index1 = 0;
        int index2 = text.indexOf(separator);

        if (index2 >= 0) {
            String token = null;
            while (index2 >= 0) {
                token = text.substring(index1, index2);
                result.add(token);
                index1 = index2 + 1;
                index2 = text.indexOf(separator, index1);
                if (index2 < 0)
                    index1--;
            }

            if (index1 < text.length() - 1) {
                result.add(text.substring(index1 + 1));
            }

        } else {
            result.add(text);
        }

        return result;
    }

    public static final void fastSplit(final String[] result, final int[] positions, final String text,
            final char separator) {

        if (text == null)
            return;
        if (text.length() == 0)
            return;

        int index1 = 0;
        int index2 = text.indexOf(separator);

        int pos = -1;
        int resultSeq = 0;
        if (index2 >= 0) {
            String token = null;
            while (index2 >= 0) {
                pos++;
                for (int aPos : positions) {
                    if (pos != aPos)
                        continue;
                    token = text.substring(index1, index2);
                    result[resultSeq++] = token;
                    break;
                }
                index1 = index2 + 1;
                index2 = text.indexOf(separator, index1);
                if (index2 < 0)
                    index1--;
            }

            if (index1 < text.length() - 1) {
                pos++;
                for (int aPos : positions) {
                    if (pos != aPos)
                        continue;
                    result[resultSeq++] = text.substring(index1 + 1);
                    break;
                }
            }

        } else {
            pos++;
            for (int aPos : positions) {
                if (pos != aPos)
                    continue;
                result[resultSeq++] = text;
                break;
            }
        }
    }

    /**
     * Checks if a string is empty
     * @param text String value to check
     * @return true/false.
     */
    public static boolean isEmpty(String text) {
        if (null == text)
            return true;
        if (text.length() == 0)
            return true;
        else
            return false;
    }
}

Related

1. fastSplit(String text, char separator)
2. split(byte[] b, int separator)
3. split(CharSequence seq, char separator)
4. split(final String expression, final char separator)