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Spring library of the jsonhome project.
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/*
 * Copyright 2012 Guido Steinacker
 *
 * 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 de.otto.jsonhome.generator;

import de.otto.jsonhome.model.Allow;
import org.springframework.web.bind.annotation.RequestMapping;

import java.lang.reflect.Method;
import java.net.URI;
import java.util.Collections;
import java.util.EnumSet;
import java.util.List;
import java.util.Set;

import static de.otto.jsonhome.model.Allow.GET;
import static java.util.Arrays.asList;
import static java.util.EnumSet.of;
import static org.springframework.core.annotation.AnnotationUtils.findAnnotation;

/**
 * A HintsGenerator that is used to generate Hints for Spring-base applications.
 */
public class SpringHintsGenerator extends HintsGenerator {

    /**
     * Creates a SpringHintsGenerator.
     *
     * @param relationTypeBaseUri the base URI used to create absolute relation-type URIs.
     * @param docRootDir the root classpath directory containing Markdown documents. May be null.
     */
    public SpringHintsGenerator(final URI relationTypeBaseUri, final String docRootDir) {
        super(relationTypeBaseUri, docRootDir);
    }

    /**
     * Analyses the method with a RequestMapping and returns a list of allowed http methods (GET, PUT, etc.).
     *
     * If the RequestMapping does not specify the allowed HTTP methods, "GET" is returned in a singleton list.
     *
     * @return list of allowed HTTP methods.
     * @throws NullPointerException if method is not annotated with @RequestMapping.
     */
    @Override
    protected Set allowedHttpMethodsOf(final Method method) {
        final RequestMapping methodRequestMapping = findAnnotation(method, RequestMapping.class);
        final Set allows = EnumSet.noneOf(Allow.class);
        for (Object o : methodRequestMapping.method()) {
            allows.add(Allow.valueOf(o.toString()));
        }
        if (allows.isEmpty()) {
            return of(GET);
        } else {
            return allows;
        }
    }

    @Override
    protected List producedRepresentationsOf(final Method method) {
        final RequestMapping methodRequestMapping = findAnnotation(method, RequestMapping.class);
        final String[] produces = methodRequestMapping.produces();
        return produces != null ? asList(produces) : Collections.emptyList();

    }

    @Override
    protected List consumedRepresentationsOf(final Method method) {
        final RequestMapping methodRequestMapping = findAnnotation(method, RequestMapping.class);
        final String[] consumes = methodRequestMapping.consumes();
        return consumes != null ? asList(consumes) : Collections.emptyList();

    }
}