nz.net.orcon.kanban.automation.actions.RegexAction.java Source code

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Here is the source code for nz.net.orcon.kanban.automation.actions.RegexAction.java

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/**
 * GRAVITY WORKFLOW AUTOMATION
 * (C) Copyright 2015 Orcon Limited
 * 
 * This file is part of Gravity Workflow Automation.
 *
 * Gravity Workflow Automation is free software: you can redistribute it 
 * and/or modify it under the terms of the GNU General Public License as 
 * published by the Free Software Foundation, either version 3 of the License,
 * or (at your option) any later version.
 *
 * Gravity Workflow Automation is distributed in the hope that it will be 
 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *    
 * You should have received a copy of the GNU General Public License
 * along with Gravity Workflow Automation.  
 * If not, see <http://www.gnu.org/licenses/>. 
 */

package nz.net.orcon.kanban.automation.actions;

import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.codec.binary.Base64;

public class RegexAction {

    public String base64Extract(String text, String expressionString, int match, int group, String options)
            throws IOException {

        if (text == null) {
            text = "";
        }

        if (expressionString == null) {
            throw new IllegalArgumentException(
                    "No Regular Expression has been provided to carry out this operation.");
        }

        byte[] exprArray = Base64.decodeBase64(expressionString);
        String decodedExpression = new String(exprArray);

        return extract(text, decodedExpression, match, group, options);
    }

    public String extract(String text, String expressionString, int match, int group, String options)
            throws IOException {

        if (text == null) {
            text = "";
        }

        if (expressionString == null) {
            throw new IllegalArgumentException(
                    "No Regular Expression has been provided to carry out this operation.");
        }

        int optionsInEffect = 0;
        if (options != null) {
            for (String option : options.toUpperCase().split("\\|")) {
                optionsInEffect |= (option.equals("CANON_EQ")) ? Pattern.CANON_EQ
                        : (option.equals("CASE_INSENSITIVE")) ? Pattern.CASE_INSENSITIVE
                                : (option.equals("COMMENTS")) ? Pattern.COMMENTS
                                        : (option.equals("DOTALL")) ? Pattern.DOTALL
                                                : (option.equals("LITERAL")) ? Pattern.LITERAL
                                                        : (option.equals("MULTILINE")) ? Pattern.MULTILINE
                                                                : (option.equals("UNICODE_CASE"))
                                                                        ? Pattern.UNICODE_CASE
                                                                        : (option.equals("UNIX_LINES"))
                                                                                ? Pattern.UNIX_LINES
                                                                                : 0;
            }
        }

        Pattern expression = Pattern.compile(expressionString, optionsInEffect);
        Matcher matches = expression.matcher(text);

        int matchIndex = 1;
        while (matches.find()) {
            for (int groupIndex = 0; matches.groupCount() + 1 > groupIndex; groupIndex++) {
                if (matchIndex == match && groupIndex == group) {
                    return matches.group(groupIndex);
                }
            }
            matchIndex++;
        }

        return "";
    }
}