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JAX-RS Support for Micronaut
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/*
 * 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.jaxrs.runtime.ext.bind;

import io.micronaut.context.BeanContext;
import io.micronaut.context.Qualifier;
import io.micronaut.core.convert.ArgumentConversionContext;
import io.micronaut.core.type.Argument;
import io.micronaut.http.HttpRequest;
import io.micronaut.http.bind.binders.AnnotatedRequestArgumentBinder;
import io.micronaut.http.bind.binders.TypedRequestArgumentBinder;
import io.micronaut.inject.qualifiers.Qualifiers;
import jakarta.inject.Inject;
import jakarta.inject.Singleton;
import jakarta.ws.rs.core.Context;

import java.util.Collection;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;

/**
 * Handles the JAX-RS {@code Context} annotation binding.
 *
 * @param  The type to bind
 * @author graemerocher
 * @since 1.0
 */
@Singleton
public class ContextAnnotationBinder implements AnnotatedRequestArgumentBinder {

    private final BeanContext beanContext;
    private final Map, TypedRequestArgumentBinder> argBinders;

    /**
     * Constructor to create a Context binder using all passed in argument binders.
     *
     * @param beanContext     The bean context
     * @param argumentBinders The argument binders
     * @since 3.3.0
     */
    @Inject
    protected ContextAnnotationBinder(BeanContext beanContext, Collection> argumentBinders) {
        this.beanContext = beanContext;
        this.argBinders = argumentBinders.stream().collect(Collectors.toMap(
            argBinder -> argBinder.argumentType().getType(),
            Function.identity(),
            (dup1, dup2) -> dup1));
    }

    @Override
    public Class getAnnotationType() {
        return Context.class;
    }

    @Override
    public BindingResult bind(ArgumentConversionContext context, HttpRequest source) {
        Argument argument = context.getArgument();
        Class javaType = argument.getType();

        //noinspection unchecked
        TypedRequestArgumentBinder binder = (TypedRequestArgumentBinder) argBinders.get(javaType);
        if (binder != null) {
            return binder.bind(context, source);
        }

        Qualifier qualifier = Qualifiers.forArgument(argument);
        return () -> beanContext.findBean(argument, qualifier);
    }
}