org.springframework.data.rest.webmvc.config.ResourceMetadataHandlerMethodArgumentResolver.java Source code

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Here is the source code for org.springframework.data.rest.webmvc.config.ResourceMetadataHandlerMethodArgumentResolver.java

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/*
 * Copyright 2012-2019 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
 *
 *      https://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 org.springframework.data.rest.webmvc.config;

import static org.springframework.util.ClassUtils.*;
import static org.springframework.util.StringUtils.*;

import org.springframework.core.MethodParameter;
import org.springframework.data.repository.support.Repositories;
import org.springframework.data.rest.core.mapping.ResourceMappings;
import org.springframework.data.rest.core.mapping.ResourceMetadata;
import org.springframework.data.rest.webmvc.BaseUri;
import org.springframework.data.rest.webmvc.util.UriUtils;
import org.springframework.util.Assert;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;

/**
 * {@link HandlerMethodArgumentResolver} to create {@link ResourceMetadata} instances.
 *
 * @author Jon Brisbin
 * @author Oliver Gierke
 * @author Jiacheng Yang
 */
public class ResourceMetadataHandlerMethodArgumentResolver implements HandlerMethodArgumentResolver {

    private final Repositories repositories;
    private final ResourceMappings mappings;
    private final BaseUri baseUri;

    /**
     * Creates a new {@link ResourceMetadataHandlerMethodArgumentResolver} for the given {@link Repositories} and
     * {@link ResourceMappings}.
     *
     * @param repositories must not be {@literal null}.
     * @param mappings must not be {@literal null}.
     * @param baseUri must not be {@literal null}.
     */
    public ResourceMetadataHandlerMethodArgumentResolver(Repositories repositories, ResourceMappings mappings,
            BaseUri baseUri) {

        Assert.notNull(repositories, "Repositories must not be null!");
        Assert.notNull(mappings, "ResourceMappings must not be null!");
        Assert.notNull(baseUri, "BaseUri must not be null!");

        this.repositories = repositories;
        this.mappings = mappings;
        this.baseUri = baseUri;
    }

    /*
     * (non-Javadoc)
     * @see org.springframework.web.method.support.HandlerMethodArgumentResolver#supportsParameter(org.springframework.core.MethodParameter)
     */
    @Override
    public boolean supportsParameter(MethodParameter parameter) {
        return isAssignable(parameter.getParameterType(), ResourceMetadata.class);
    }

    /*
     * (non-Javadoc)
     * @see org.springframework.web.method.support.HandlerMethodArgumentResolver#resolveArgument(org.springframework.core.MethodParameter, org.springframework.web.method.support.ModelAndViewContainer, org.springframework.web.context.request.NativeWebRequest, org.springframework.web.bind.support.WebDataBinderFactory)
     */
    @Override
    public ResourceMetadata resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer,
            NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {

        String lookupPath = baseUri.getRepositoryLookupPath(webRequest);
        String repositoryKey = UriUtils.findMappingVariable("repository", parameter.getMethod(), lookupPath);

        if (!hasText(repositoryKey)) {
            return null;
        }

        for (Class<?> domainType : repositories) {
            ResourceMetadata mapping = mappings.getMetadataFor(domainType);
            if (mapping.getPath().matches(repositoryKey) && mapping.isExported()) {
                return mapping;
            }
        }

        throw new IllegalArgumentException(
                String.format("Could not resolve repository metadata for %s.", repositoryKey));
    }
}