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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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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.sshd.common.config;

import java.io.InputStream;
import java.util.Collections;
import java.util.Iterator;
import java.util.NavigableMap;
import java.util.Properties;
import java.util.TreeMap;

import org.apache.sshd.common.util.GenericUtils;
import org.apache.sshd.common.util.threads.ThreadUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Apache MINA SSHD Project
 */
public final class VersionProperties {
    /**
     * Property used to hold the reported version
     */
    public static final String REPORTED_VERSION = "sshd-version";

    private static final class LazyVersionPropertiesHolder {
        private static final NavigableMap PROPERTIES = Collections.unmodifiableNavigableMap(
                loadVersionProperties(LazyVersionPropertiesHolder.class));

        private LazyVersionPropertiesHolder() {
            throw new UnsupportedOperationException("No instance allowed");
        }

        private static NavigableMap loadVersionProperties(Class anchor) {
            return loadVersionProperties(anchor, ThreadUtils.iterateDefaultClassLoaders(anchor));
        }

        private static NavigableMap loadVersionProperties(
                Class anchor, Iterator loaders) {
            while ((loaders != null) && loaders.hasNext()) {
                ClassLoader cl = loaders.next();
                Properties props;
                try (InputStream input = cl.getResourceAsStream("org/apache/sshd/sshd-version.properties")) {
                    if (input == null) {
                        continue;
                    }

                    props = new Properties();
                    props.load(input);
                } catch (Exception e) {
                    Logger log = LoggerFactory.getLogger(anchor);
                    log.warn("Failed ({}) to load version properties from {}: {}",
                            e.getClass().getSimpleName(), cl, e.getMessage());
                    if (log.isDebugEnabled()) {
                        log.debug("Version property failure details for loader={}", cl, e);
                    }
                    continue;
                }

                NavigableMap result = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
                for (String key : props.stringPropertyNames()) {
                    String propValue = props.getProperty(key);
                    String value = GenericUtils.trimToEmpty(propValue);
                    if (GenericUtils.isEmpty(value)) {
                        continue; // we have no need for empty values
                    }

                    String prev = result.put(key, value);
                    if (prev != null) {
                        Logger log = LoggerFactory.getLogger(anchor);
                        log.warn("Multiple values for key={}: current={}, previous={}", key, value, prev);
                    }
                }

                return result;
            }

            return Collections.emptyNavigableMap();
        }
    }

    private VersionProperties() {
        throw new UnsupportedOperationException("No instance");
    }

    /**
     * @return A case insensitive un-modifiable {@link NavigableMap} of the {@code sshd-version.properties} data
     */
    @SuppressWarnings("synthetic-access")
    public static NavigableMap getVersionProperties() {
        return LazyVersionPropertiesHolder.PROPERTIES;
    }
}