com.adobe.aem.demomachine.RegExp.java Source code

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Here is the source code for com.adobe.aem.demomachine.RegExp.java

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/*******************************************************************************
 * Copyright 2016 Adobe Systems Incorporated.
 * 
 * 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.adobe.aem.demomachine;

import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.cli.BasicParser;
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import org.apache.log4j.Logger;

public class RegExp {

    static Logger logger = Logger.getLogger(RegExp.class);

    public static void main(String[] args) throws IOException {

        String fileName = null;
        String regExp = null;
        String position = null;
        String value = "n/a";
        List<String> allMatches = new ArrayList<String>();

        // Command line options for this tool
        Options options = new Options();
        options.addOption("f", true, "Filename");
        options.addOption("r", true, "RegExp");
        options.addOption("p", true, "Position");
        CommandLineParser parser = new BasicParser();
        try {
            CommandLine cmd = parser.parse(options, args);

            if (cmd.hasOption("f")) {
                fileName = cmd.getOptionValue("f");
            }

            if (cmd.hasOption("f")) {
                regExp = cmd.getOptionValue("r");
            }

            if (cmd.hasOption("p")) {
                position = cmd.getOptionValue("p");
            }

            if (fileName == null || regExp == null || position == null) {
                System.out.println("Command line parameters: -f fileName -r regExp -p position");
                System.exit(-1);
            }

        } catch (ParseException ex) {

            logger.error(ex.getMessage());

        }

        String content = readFile(fileName, Charset.defaultCharset());

        if (content != null) {
            Matcher m = Pattern.compile(regExp).matcher(content);
            while (m.find()) {
                String group = m.group();
                int pos = group.indexOf(".zip");
                if (pos > 0) {
                    group = group.substring(0, pos);
                }
                logger.debug("RegExp: " + m.group() + " found returning " + group);
                allMatches.add(group);
            }

            if (allMatches.size() > 0) {

                if (position.equals("first")) {
                    value = allMatches.get(0);
                }

                if (position.equals("last")) {
                    value = allMatches.get(allMatches.size() - 1);
                }
            }
        }

        System.out.println(value);

    }

    static String readFile(String path, Charset encoding) throws IOException {

        byte[] encoded = Files.readAllBytes(Paths.get(path));
        return new String(encoded, encoding);

    }

}