com.threewks.thundr.view.negotiating.ViewNegotiatorRegistryImpl.java Source code

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Here is the source code for com.threewks.thundr.view.negotiating.ViewNegotiatorRegistryImpl.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;

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;

import com.atomicleopard.expressive.Expressive;

public class ViewNegotiatorRegistryImpl implements ViewNegotiatorRegistry {
    private Map<String, Negotiator<?>> negotiatorsByContentType = new LinkedHashMap<String, Negotiator<?>>();
    private Negotiator<?> defaultNegotiator = null;

    @Override
    public void addNegotiator(String contentType, Negotiator<?> negotiator) {
        this.negotiatorsByContentType.put(normaliseContentType(contentType), negotiator);
    }

    @Override
    @SuppressWarnings("unchecked")
    public <V> Negotiator<V> getNegotiator(String contentType) {
        return (Negotiator<V>) this.negotiatorsByContentType.get(normaliseContentType(contentType));
    }

    @Override
    public void removeNegotiator(String contentType) {
        this.negotiatorsByContentType.remove(normaliseContentType(contentType));
    }

    @Override
    public List<String> listNegotiatedContentTypes() {
        return Expressive.list(this.negotiatorsByContentType.keySet())
                .sort(Expressive.Comparators.caseInsensitive());
    }

    @Override
    public Negotiator<?> getDefaultNegotiator() {
        return defaultNegotiator;
    }

    @Override
    public void setDefaultNegotiator(Negotiator<?> negotiator) {
        this.defaultNegotiator = negotiator;
    }

    public static String normaliseContentType(String contentType) {
        contentType = StringUtils.lowerCase(StringUtils.trimToEmpty(contentType));
        return contentType;
    }
}