ch.ledcom.log4jtools.config.ConfigReader.java Source code

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Here is the source code for ch.ledcom.log4jtools.config.ConfigReader.java

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/**
 *     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 ch.ledcom.log4jtools.config;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;

import org.apache.log4j.Level;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;

import ch.ledcom.log4jtools.filter.CategorizationFilter;

public class ConfigReader {

    public List<CategorizationFilter> loadConfig(InputStream in) throws InvalidFormatException, IOException {
        List<CategorizationFilter> result = new ArrayList<CategorizationFilter>();
        Workbook wb = WorkbookFactory.create(in);
        Sheet sheet = wb.getSheetAt(0);
        int i = 1;
        while (true) {
            Row row = sheet.getRow(i++);

            String description = readCell(row, 0);
            if (description == null) {
                break;
            }
            String loggerName = readCell(row, 1);
            Level level = readCell(row, 2) == null ? (Level) null : Level.toLevel(readCell(row, 2));
            Pattern messagePattern = readPattern(row, 3);
            Pattern throwablePattern = readPattern(row, 4);
            String category = readCell(row, 5);
            String bugTrackerRef = readCell(row, 6);

            CategorizationFilter filter = new CategorizationFilter(description, loggerName, level, messagePattern,
                    throwablePattern, category, bugTrackerRef);
            result.add(filter);
        }
        return result;
    }

    private Pattern readPattern(Row row, int cellnum) {
        String cell = readCell(row, cellnum);
        if (cell == null || cell.equals("")) {
            return null;
        }
        return Pattern.compile(cell, Pattern.DOTALL);
    }

    private String readCell(Row row, int cellnum) {
        if (row == null) {
            return null;
        }
        Cell cell = row.getCell(cellnum);
        return cell == null ? (String) null : cell.getStringCellValue().trim();
    }

}