org.eclipse.virgo.bundlor.maven/src/main/java/org/eclipse/virgo/bundlor/maven/plugin/internal/MavenVersionNumberConverter.java

/*******************************************************************************
 * Copyright (c) 2008, 2010 VMware Inc.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   VMware Inc. - initial contribution
 *******************************************************************************/

package org.eclipse.virgo.bundlor.maven.plugin.internal;

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

public final class MavenVersionNumberConverter {

    private static final Pattern VERSION_PATTERN = Pattern.compile("(\\d)(\\.\\d)?(\\.\\d)?([\\.-]{1}.*)?");

    public String convertToOsgi(String mavenVersionNumber) {
        VersionBuilder versionBuilder = new VersionBuilder();

        Matcher matcher = VERSION_PATTERN.matcher(mavenVersionNumber);
        matcher.find();
        versionBuilder.setMajor(matcher.group(1));
        versionBuilder.setMinor(matcher.group(2));
        versionBuilder.setMicro(matcher.group(3));
        versionBuilder.setQualifier(matcher.group(4));

        return versionBuilder.getVersionString();
    }

    private static class VersionBuilder {

        private volatile String major = "0";

        private volatile String minor = "0";

        private volatile String micro = "0";

        private volatile String qualifier = null;

        public void setMajor(String major) {
            if (major != null) {
                this.major = major;
            }
        }

        public void setMinor(String minor) {
            if (minor != null) {
                this.minor = trim(minor);
            }
        }

        public void setMicro(String micro) {
            if (micro != null) {
                this.micro = trim(micro);
            }
        }

        public void setQualifier(String qualifier) {
            if (qualifier != null) {
                this.qualifier = trim(qualifier).replaceAll("\\.", "_");
            }
        }

        public String getVersionString() {
            if (qualifier == null) {
                return String.format("%s.%s.%s", major, minor, micro);
            }
            return String.format("%s.%s.%s.%s", major, minor, micro, qualifier);
        }

        private String trim(String s) {
            return s.substring(1);
        }
    }
}