io.micronaut.spring.web.bind.ModelMapRequestArgumentBinder Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of micronaut-spring-web Show documentation

Extensions to integrate Micronaut and Spring

There is a newer version: 5.9.0

/*
 * Copyright 2017-2020 original 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 io.micronaut.spring.web.bind;

import io.micronaut.core.convert.ArgumentConversionContext;
import io.micronaut.core.type.Argument;
import io.micronaut.http.HttpRequest;
import io.micronaut.http.bind.binders.TypedRequestArgumentBinder;
import org.springframework.ui.ModelMap;

import java.util.Optional;

/**
 * Binds the {@link ModelMap} type.
 *
 * @author graemerocher
 * @since 1.0
 */
public class ModelMapRequestArgumentBinder implements TypedRequestArgumentBinder {

    /**
     * The name of the request attribute to use.
     */
    public static final String ATTRIBUTE = "io.micronaut.spring.MODEL_MAP";

    @Override
    public Argument argumentType() {
        return Argument.of(ModelMap.class);
    }

    @Override
    public BindingResult bind(ArgumentConversionContext context, HttpRequest source) {
        final Optional attribute = source.getAttribute(ATTRIBUTE, ModelMap.class);
        if (!attribute.isPresent()) {
            final ModelMap modelMap = new ModelMap();
            source.setAttribute(ATTRIBUTE, modelMap);
            return () -> Optional.of(modelMap);
        }
        return () -> attribute;
    }
}