hotfix/source/openejb-core_4.5.2/src.original/main/java/org/apache/openejb/util/ConfUtils.java

/*
 * 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.openejb.util;

import org.apache.openejb.EnvProps;
import org.apache.openejb.loader.FileUtils;
import org.apache.openejb.loader.IO;
import org.apache.openejb.loader.SystemInstance;

import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;
import java.util.Collections;
import java.util.ArrayList;

/**
 * @version $Rev: 1394819 $ $Date: 2012-10-05 21:19:51 +0000 (Fri, 05 Oct 2012) $
 */
public class ConfUtils {

    public static URL getConfResource(String name) {
        URL resource = getResource(name);

        if (!EnvProps.extractConfigurationFiles()) return resource;

        try {

            File loginConfig = ConfUtils.install(resource, name);

            if (loginConfig != null){
                resource = loginConfig.toURI().toURL();
            }
        } catch (IOException e) {
        }

        return resource;
    }

    public static URL getResource(String name) {
        Enumeration<URL> resources = null;
        try {
            resources = Thread.currentThread().getContextClassLoader().getResources(name);
        } catch (IOException e) {
            // DMB: Not sure why this version of getResource doesn't require checking
            // for IOException, but no matter.  Perhpas it may succeed where the other fails.
            return Thread.currentThread().getContextClassLoader().getResource(name);
        }

        URL resource = select(resources);
        return resource;
    }

    private static URL select(Enumeration<URL> enumeration) {
        if (enumeration == null) return null;
        ArrayList<URL> urls = Collections.list(enumeration);
        if (urls.size() == 0) return null;
        if (urls.size() == 1) return urls.get(0);

        // Sort so that the URL closest to openejb.base is first
        Collections.sort(urls, new UrlComparator(SystemInstance.get().getBase().getDirectory()));

        return urls.get(0);
    }

    public static File install(String source, String name) throws IOException {
        ClassLoader cl = Thread.currentThread().getContextClassLoader();
        URL resource = cl.getResource(source);
        return install(resource, name, false);
    }

    public static File install(URL resource, String name) throws IOException {
        return install(resource, name, false);
    }

    public static File install(URL resource, String name, boolean overwrite) throws IOException {
        if (resource == null) return null;

        SystemInstance system = SystemInstance.get();
        FileUtils base = system.getBase();
        File conf = system.getConf(null);

        if (conf != null && !conf.exists()) return null;

        File file = new File(conf, name);

        if (file.exists() && !overwrite) return file;

        IO.copy(IO.read(resource), file);

        return file;
    }

}