/*
 * Copyright (c) 2010, 2019 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package org.glassfish.jersey.server.internal.inject;

import java.util.function.Function;

import javax.ws.rs.HeaderParam;

import javax.inject.Provider;
import javax.inject.Singleton;

import org.glassfish.jersey.internal.inject.ExtractorException;
import org.glassfish.jersey.server.ContainerRequest;
import org.glassfish.jersey.server.ParamException;
import org.glassfish.jersey.server.model.Parameter;

Value supplier provider supporting the @HeaderParam injection annotation. 
Author:
Paul Sandoz, Marek Potociar/**
 * Value supplier provider supporting the {@link HeaderParam @HeaderParam} injection annotation.
 *
 * @author Paul Sandoz
 * @author Marek Potociar
 */
@Singleton
final class HeaderParamValueParamProvider extends AbstractValueParamProvider {

    
Injection constructor.
Params:
mpep – multivalued map parameter extractor provider./**
     * Injection constructor.
     *
     * @param mpep multivalued map parameter extractor provider.
     */
    public HeaderParamValueParamProvider(Provider<MultivaluedParameterExtractorProvider> mpep) {
        super(mpep, Parameter.Source.HEADER);
    }

    @Override
    public Function<ContainerRequest, ?> createValueProvider(Parameter parameter) {
        String parameterName = parameter.getSourceName();
        if (parameterName == null || parameterName.length() == 0) {
            // Invalid header parameter name
            return null;
        }

        MultivaluedParameterExtractor e = get(parameter);
        if (e == null) {
            return null;
        }

        return new HeaderParamValueProvider(e);
    }

    private static final class HeaderParamValueProvider implements Function<ContainerRequest, Object> {

        private final MultivaluedParameterExtractor<?> extractor;

        HeaderParamValueProvider(MultivaluedParameterExtractor<?> extractor) {
            this.extractor = extractor;
        }

        @Override
        public Object apply(ContainerRequest containerRequest) {
            try {
                return extractor.extract(containerRequest.getHeaders());
            } catch (ExtractorException e) {
                throw new ParamException.HeaderParamException(e.getCause(),
                        extractor.getName(), extractor.getDefaultValueString());
            }
        }
    }
}