springfox.documentation.spring.web.plugins.DefaultRequestHandlerCombiner.java Source code

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Here is the source code for springfox.documentation.spring.web.plugins.DefaultRequestHandlerCombiner.java

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/*
 *
 *  Copyright 2017-2018 the original author or authors.
 *
 *  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 springfox.documentation.spring.web.plugins;

import com.google.common.base.Equivalence;
import com.google.common.base.Function;
import com.google.common.collect.LinkedListMultimap;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multimaps;
import springfox.documentation.RequestHandler;
import springfox.documentation.spi.service.RequestHandlerCombiner;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import static com.google.common.collect.Lists.*;
import static springfox.documentation.builders.BuilderDefaults.*;
import static springfox.documentation.spi.service.contexts.Orderings.*;

class DefaultRequestHandlerCombiner implements RequestHandlerCombiner {

    private static final PathAndParametersEquivalence EQUIVALENCE = new PathAndParametersEquivalence();

    public List<RequestHandler> combine(List<RequestHandler> source) {
        List<RequestHandler> combined = new ArrayList<RequestHandler>();
        Multimap<String, RequestHandler> byPath = LinkedListMultimap.create();
        for (RequestHandler each : nullToEmptyList(source)) {
            byPath.put(patternsCondition(each).toString(), each);
        }
        for (String key : byPath.keySet()) {
            combined.addAll(combined(byPath.get(key)));
        }
        return byPatternsCondition().sortedCopy(combined);
    }

    private Collection<? extends RequestHandler> combined(Collection<RequestHandler> requestHandlers) {
        List<RequestHandler> source = newArrayList(requestHandlers);
        if (source.size() == 0 || source.size() == 1) {
            return requestHandlers;
        }
        ListMultimap<Equivalence.Wrapper<RequestHandler>, RequestHandler> groupByEquality = Multimaps.index(source,
                equivalenceAsKey());
        List<RequestHandler> combined = newArrayList();
        for (Equivalence.Wrapper<RequestHandler> path : groupByEquality.keySet()) {
            List<RequestHandler> handlers = groupByEquality.get(path);

            RequestHandler toCombine = path.get();
            if (handlers.size() > 1) {
                for (RequestHandler each : handlers) {
                    toCombine = combine(toCombine, each);
                }
            }
            combined.add(toCombine);
        }
        return combined;
    }

    private Function<RequestHandler, Equivalence.Wrapper<RequestHandler>> equivalenceAsKey() {
        return new Function<RequestHandler, Equivalence.Wrapper<RequestHandler>>() {
            @Override
            public Equivalence.Wrapper<RequestHandler> apply(RequestHandler input) {
                return EQUIVALENCE.wrap(input);
            }
        };
    }

    private RequestHandler combine(RequestHandler first, RequestHandler second) {
        return new CombinedRequestHandler(first, second);
    }
}