read Csv Line - Java File Path IO

Java examples for File Path IO:CSV File

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Description

read Csv Line

Demo Code

/**//from  w w  w. j  av  a  2  s  .co m
 * Copyright 2004-2009 Tobias Gierke <tobias.gierke@code-sourcery.de>
 *
 * 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.java2s;
import java.io.BufferedReader;
import java.io.IOException;

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

public class Main {
    public static final char COLUMN_SEPARATOR = ';';
    public static final char LINE_SEPARATOR = '\n';
    private static final String[] EMPTY_ARRAY = new String[0];

    public static String[] readCsvLine(String line) throws IOException {
        return readCsvLine(line, COLUMN_SEPARATOR, LINE_SEPARATOR);
    }

    public static String[] readCsvLine(BufferedReader reader)
            throws IOException {
        return readCsvLine(reader, COLUMN_SEPARATOR, LINE_SEPARATOR);
    }

    public static String[] readCsvLine(BufferedReader reader,
            char columnSeparator) throws IOException {
        return readCsvLine(reader, columnSeparator, LINE_SEPARATOR);
    }

    public static String[] readCsvLine(BufferedReader reader,
            char columnSeparator, char lineSeparator) throws IOException {
        return readCsvLine(reader.readLine(), columnSeparator,
                lineSeparator);
    }

    public static String[] readCsvLine(String line, char columnSeparator,
            char lineSeparator) throws IOException {

        if (line == null) {
            return EMPTY_ARRAY;
        }

        final int len = line.length();
        if (len == 0) {
            return EMPTY_ARRAY;
        }

        final List<String> result = new ArrayList<String>();

        int lastMark = 0;

        for (int i = 0; i < len; i++) {
            final char c = line.charAt(i);
            if (c == columnSeparator) {
                result.add(line.substring(lastMark, i));
                lastMark = i + 1;
            } else if (c == lineSeparator) {
                result.add(line.substring(lastMark, i));
                lastMark = len;
                break;
            }
        }

        if (lastMark < len) {
            result.add(line.substring(lastMark, len));
        }

        return result.toArray(new String[result.size()]);
    }
}

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