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

import java.util.function.Function;

import javax.ws.rs.QueryParam;

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 {@link QueryParam &#64;QueryParam} injection annotation.
 *
 * @author Paul Sandoz
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
@Singleton
final class QueryParamValueParamProvider extends AbstractValueParamProvider {

    /**
     * Injection constructor.
     *
     * @param mpep multivalued map parameter extractor provider.
     */
    public QueryParamValueParamProvider(Provider<MultivaluedParameterExtractorProvider> mpep) {
        super(mpep, Parameter.Source.QUERY);
    }

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

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

        return new QueryParamValueProvider(e, !parameter.isEncoded());
    }

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

        private final MultivaluedParameterExtractor<?> extractor;
        private final boolean decode;

        QueryParamValueProvider(MultivaluedParameterExtractor<?> extractor, boolean decode) {
            this.extractor = extractor;
            this.decode = decode;
        }

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