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Milton Community Edition: Supports DAV level 1 and is available on Apache2 license

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/*
 *
 * Copyright 2014 McEvoy Software Ltd.
 *
 * Licensed 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 io.milton.http;

import io.milton.http.exceptions.BadRequestException;
import io.milton.http.exceptions.NotAuthorizedException;
import io.milton.resource.Resource;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MultipleResourceFactory implements ResourceFactory {

	private final Logger log = LoggerFactory.getLogger(MultipleResourceFactory.class);
	protected final List factories;
	protected Map mapOfFactoriesByHost;

	public MultipleResourceFactory() {
		factories = new ArrayList<>();
	}

	public MultipleResourceFactory(List factories) {
		this.factories = factories;
	}

	@Override
	public Resource getResource(String host, String url) throws NotAuthorizedException, BadRequestException {
		if (log.isTraceEnabled()) {
			log.trace("getResource: " + url);
		}
		ResourceFactory hostRf = null;
		if (mapOfFactoriesByHost != null) {
			hostRf = mapOfFactoriesByHost.get(host);
		}
		Resource theResource;
		if (hostRf != null) {
			theResource = hostRf.getResource(host, url);
		} else {
			theResource = findFromFactories(host, url);
		}
		if (theResource == null) {
			log.debug("no resource factory supplied a resouce");
		} else {

		}
		return theResource;
	}

	/**
	 * Allows factories to be added after construction
	 *
	 * @param rf
	 */
	public void add(ResourceFactory rf) {
		factories.add(rf);
	}

	public void addAsFirst(ResourceFactory rf) {
		factories.add(0, rf);
	}

	/**
	 * When set will always be used exclusively for any matching hosts
	 *
	 * @return
	 */
	public Map getMapOfFactoriesByHost() {
		return mapOfFactoriesByHost;
	}

	public void setMapOfFactoriesByHost(Map mapOfFactoriesByHost) {
		this.mapOfFactoriesByHost = mapOfFactoriesByHost;
	}

	private Resource findFromFactories(String host, String url) throws NotAuthorizedException, BadRequestException {

		for (ResourceFactory rf : factories) {
			long tm = System.currentTimeMillis();
			try {
				Resource r = rf.getResource(host, url);
				if (r != null) {
					if (log.isTraceEnabled()) {
						log.trace("Found resource: " + r.getClass() + " from factory: " + rf.getClass());
					}
					return r;
				}
			} finally {
				tm = System.currentTimeMillis() - tm;
				if (tm > 1000) {
					log.info("Slow lookup of {}ms in resourcefactory {}", tm, rf);
				}
			}
		}

		return null;
	}
}