com.threewks.thundr.view.negotiating.strategy.FileExtensionNegotiationStrategy.java Source code

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Here is the source code for com.threewks.thundr.view.negotiating.strategy.FileExtensionNegotiationStrategy.java

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/*
 * This file is a component of thundr, a software library from 3wks.
 * Read more: http://3wks.github.io/thundr/
 * Copyright (C) 2014 3wks, <thundr@3wks.com.au>
 *
 * 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 com.threewks.thundr.view.negotiating.strategy;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang3.StringUtils;

import com.threewks.thundr.view.negotiating.NegotiatingView;
import com.threewks.thundr.view.negotiating.Negotiator;
import com.threewks.thundr.view.negotiating.ViewNegotiatorRegistry;

import jodd.util.MimeTypes;

/**
 * Finds a {@link Negotiator} using the file extension on the request.
 * If no matching negotiator exists, returns null
 */
public class FileExtensionNegotiationStrategy implements NegotiationStrategy {

    @Override
    public Negotiator<?> findNegotiator(HttpServletRequest req, NegotiatingView view,
            ViewNegotiatorRegistry viewNegotiatorRegistry) {
        String requestUri = req.getRequestURI();
        String extension = StringUtils.trimToEmpty(StringUtils.substringAfterLast(requestUri, "."));
        String mimeType = MimeTypes.lookupMimeType(extension);
        return viewNegotiatorRegistry.getNegotiator(mimeType);
    }

}