/*
 * 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.catalina.storeconfig;

import java.io.PrintWriter;

import org.apache.catalina.Loader;
import org.apache.catalina.loader.WebappLoader;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;

/**
 * Store Loader Element.
 */
public class LoaderSF extends StoreFactoryBase {

    private static final Log log = LogFactory.getLog(LoaderSF.class);

    @Override
    public void store(PrintWriter aWriter, int indent, Object aElement) throws Exception {
        StoreDescription elementDesc = getRegistry().findDescription(aElement.getClass());
        if (elementDesc != null) {
            Loader loader = (Loader) aElement;
            if (!isDefaultLoader(loader)) {
                if (log.isTraceEnabled()) {
                    log.trace("store " + elementDesc.getTag() + "( " + aElement + " )");
                }
                getStoreAppender().printIndent(aWriter, indent + 2);
                getStoreAppender().printTag(aWriter, indent + 2, loader, elementDesc);
            }
        } else {
            if (log.isWarnEnabled()) {
                log.warn(sm.getString("factory.storeNoDescriptor", aElement.getClass()));
            }
        }
    }

    /**
     * Is this an instance of the default <code>Loader</code> configuration, with all-default properties?
     *
     * @param loader Loader to be tested
     *
     * @return <code>true</code> if this is an instance of the default loader
     */
    protected boolean isDefaultLoader(Loader loader) {

        if (!(loader instanceof WebappLoader)) {
            return false;
        }
        WebappLoader wloader = (WebappLoader) loader;
        return (!wloader.getDelegate()) &&
                wloader.getLoaderClass().equals("org.apache.catalina.loader.WebappClassLoader");
    }
}
