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Karaf Util contains utility classes used in different Karaf modules.
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.karaf.util;

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

/**
 * Contain various methods that are useful for deploying artifacts.
 */
public final class DeployerUtils {

    /** Private constructors to avoid instantiation */
    private DeployerUtils() { }

    private static final String DEFAULT_VERSION = "0.0.0";

    private static final Pattern ARTIFACT_MATCHER = Pattern.compile("(.+)(?:-(\\d+)(?:\\.(\\d+)(?:\\.(\\d+))?)?(?:[^a-zA-Z0-9](.*))?)(?:\\.([^\\.]+))", Pattern.DOTALL);
    private static final Pattern FUZZY_MODIFIDER = Pattern.compile("(?:\\d+[.-])*(.*)", Pattern.DOTALL);

    /**
     * Heuristic to compute the name and version of a file given it's name on disk
     *
     * @param url the name of the file
     * @return the name and version of that file
     */
    public static String[] extractNameVersionType(String url) {
        Matcher m = ARTIFACT_MATCHER.matcher(url);
        if (!m.matches()) {
            return new String[] { url, DEFAULT_VERSION };
        }
        else {
            StringBuffer v = new StringBuffer();
            String d1 = m.group(1);
            String d2 = m.group(2);
            String d3 = m.group(3);
            String d4 = m.group(4);
            String d5 = m.group(5);
            String d6 = m.group(6);
            if (d2 != null) {
                v.append(d2);
                if (d3 != null) {
                    v.append('.');
                    v.append(d3);
                    if (d4 != null) {
                        v.append('.');
                        v.append(d4);
                        if (d5 != null) {
                            v.append(".");
                            cleanupModifier(v, d5);
                        }
                    } else if (d5 != null) {
                        v.append(".0.");
                        cleanupModifier(v, d5);
                    }
                } else if (d5 != null) {
                    v.append(".0.0.");
                    cleanupModifier(v, d5);
                }
            }
            return new String[] { d1, v.toString(), d6 };
        }
    }

    private static void cleanupModifier(StringBuffer result, String modifier) {
        Matcher m = FUZZY_MODIFIDER.matcher(modifier);
        if (m.matches()) {
            modifier = m.group(1);
        }
        for (int i = 0; i < modifier.length(); i++) {
            char c = modifier.charAt(i);
            if ((c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_' || c == '-') {
                result.append(c);
            }
        }
    }


}