org.springframework.web.reactive.result.method.annotation.PathVariableMapMethodArgumentResolver.java Source code

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Here is the source code for org.springframework.web.reactive.result.method.annotation.PathVariableMapMethodArgumentResolver.java

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/*
 * Copyright 2002-2018 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
 *
 *      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.web.reactive.result.method.annotation;

import java.util.Collections;
import java.util.Map;

import org.springframework.core.MethodParameter;
import org.springframework.core.ReactiveAdapterRegistry;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.reactive.BindingContext;
import org.springframework.web.reactive.HandlerMapping;
import org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverSupport;
import org.springframework.web.reactive.result.method.SyncHandlerMethodArgumentResolver;
import org.springframework.web.server.ServerWebExchange;

/**
 * Resolver for {@link Map} method arguments also annotated with
 * {@link PathVariable @PathVariable} where the annotation does not specify a
 * path variable name. The resulting {@link Map} argument is a coyp of all URI
 * template name-value pairs.
 *
 * @author Rossen Stoyanchev
 * @since 5.0
 * @see PathVariableMethodArgumentResolver
 */
public class PathVariableMapMethodArgumentResolver extends HandlerMethodArgumentResolverSupport
        implements SyncHandlerMethodArgumentResolver {

    public PathVariableMapMethodArgumentResolver(ReactiveAdapterRegistry adapterRegistry) {
        super(adapterRegistry);
    }

    @Override
    public boolean supportsParameter(MethodParameter parameter) {
        return checkAnnotatedParamNoReactiveWrapper(parameter, PathVariable.class, this::allVariables);
    }

    private boolean allVariables(PathVariable pathVariable, Class<?> type) {
        return (Map.class.isAssignableFrom(type) && !StringUtils.hasText(pathVariable.value()));
    }

    @Override
    public Object resolveArgumentValue(MethodParameter methodParameter, BindingContext context,
            ServerWebExchange exchange) {

        String name = HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE;
        return exchange.getAttributeOrDefault(name, Collections.emptyMap());
    }

}