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

import javax.ws.rs.HeaderParam;

import javax.inject.Inject;
import javax.inject.Singleton;

import org.glassfish.jersey.server.ParamException;
import org.glassfish.jersey.server.model.Parameter;

import org.glassfish.hk2.api.ServiceLocator;

/**
 * Value factory provider supporting the {@link HeaderParam &#64;HeaderParam} injection annotation.
 *
 * @author Paul Sandoz
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
@Singleton
final class HeaderParamValueFactoryProvider extends AbstractValueFactoryProvider {

    /**
     * {@link HeaderParam &#64;HeaderParam} injection resolver.
     */
    @Singleton
    static final class InjectionResolver extends ParamInjectionResolver<HeaderParam> {

        /**
         * Create new {@link HeaderParam &#64;HeaderParam} injection resolver.
         */
        public InjectionResolver() {
            super(HeaderParamValueFactoryProvider.class);
        }
    }

    private static final class HeaderParamValueFactory extends AbstractContainerRequestValueFactory<Object> {

        private MultivaluedParameterExtractor<?> extractor;

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

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

    /**
     * Injection constructor.
     *
     * @param mpep    multivalued map parameter extractor provider.
     * @param locator HK2 service locator.
     */
    @Inject
    public HeaderParamValueFactoryProvider(MultivaluedParameterExtractorProvider mpep, ServiceLocator locator) {
        super(mpep, locator, Parameter.Source.HEADER);
    }

    @Override
    public AbstractContainerRequestValueFactory<?> createValueFactory(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 HeaderParamValueFactory(e);
    }
}
