mitm.common.postfix.PostfixMainConfigParser.java Source code

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Here is the source code for mitm.common.postfix.PostfixMainConfigParser.java

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/*
 * Copyright (c) 2008-2011, Martijn Brinkers, Djigzo.
 * 
 * This file is part of Djigzo email encryption.
 *
 * Djigzo is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License 
 * version 3, 19 November 2007 as published by the Free Software 
 * Foundation.
 *
 * Djigzo 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public 
 * License along with Djigzo. If not, see <http://www.gnu.org/licenses/>
 *
 * Additional permission under GNU AGPL version 3 section 7
 * 
 * If you modify this Program, or any covered work, by linking or 
 * combining it with aspectjrt.jar, aspectjweaver.jar, tyrex-1.0.3.jar, 
 * freemarker.jar, dom4j.jar, mx4j-jmx.jar, mx4j-tools.jar, 
 * spice-classman-1.0.jar, spice-loggerstore-0.5.jar, spice-salt-0.8.jar, 
 * spice-xmlpolicy-1.0.jar, saaj-api-1.3.jar, saaj-impl-1.3.jar, 
 * wsdl4j-1.6.1.jar (or modified versions of these libraries), 
 * containing parts covered by the terms of Eclipse Public License, 
 * tyrex license, freemarker license, dom4j license, mx4j license,
 * Spice Software License, Common Development and Distribution License
 * (CDDL), Common Public License (CPL) the licensors of this Program grant 
 * you additional permission to convey the resulting work.
 */
package mitm.common.postfix;

import java.io.Reader;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.io.LineIterator;
import org.apache.commons.lang.StringUtils;

public class PostfixMainConfigParser {
    private static final String LF = "\n";

    /*
     * name prefix of non name/value lines
     */
    public static final String OTHER_LINE_NAME = "other_";

    /*
     * Pattern for a continuation line
     */
    private static final Pattern CONTINUATION = Pattern.compile("^\\s+.*");

    /*
     * Pattern for a name value line
     */
    private static final Pattern NAME_VALUE = Pattern.compile("(?s)^(\\S+)\\s*=\\s*(.*)");

    private static List<String> normalize(Reader config) {
        List<String> lines = new LinkedList<String>();

        LineIterator it = new LineIterator(config);

        String line = "";

        try {
            while (it.hasNext()) {
                String nextLine = it.nextLine();

                Matcher matcher = CONTINUATION.matcher(nextLine);

                if (!nextLine.trim().startsWith("#") && matcher.matches()) {
                    /* its a continuation line */
                    line = line + LF + nextLine;
                } else {
                    matcher = NAME_VALUE.matcher(nextLine);

                    if (matcher.matches()) {
                        /* its a name/value line */

                        if (StringUtils.isNotEmpty(line)) {
                            /* store the previous line because it is finished */
                            lines.add(line);
                        }

                        line = nextLine;
                    } else {
                        /* it's some other line like a comment */
                        if (StringUtils.isNotEmpty(line)) {
                            /* store the previous line because it is finished */
                            lines.add(line);
                        }
                        lines.add(nextLine);

                        line = "";
                    }
                }
            }
            if (StringUtils.isNotEmpty(line)) {
                lines.add(line);
            }
        } finally {
            LineIterator.closeQuietly(it);
        }

        return lines;
    }

    public static LinkedHashMap<String, String> parse(Reader config) {
        LinkedHashMap<String, String> values = new LinkedHashMap<String, String>();

        List<String> lines = normalize(config);

        int i = 0;

        for (String line : lines) {
            Matcher matcher = NAME_VALUE.matcher(line);

            if (!line.startsWith("#") && matcher.matches()) {
                String value = matcher.group(2);

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

                values.put(matcher.group(1), value);
            } else {
                values.put(OTHER_LINE_NAME + i++, line);
            }
        }

        return values;
    }
}