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 * 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 javax.ws.rs.ProcessingException;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.ParamConverter;

import org.glassfish.jersey.internal.inject.ExtractorException;

Extract value of the parameter using a single parameter value and the underlying param converter. 
Author:
Paul Sandoz, Marek Potociar
Type parameters:
<T> – extracted Java type./**
 * Extract value of the parameter using a single parameter value and the underlying
 * {@link ParamConverter param converter}.
 *
 * @param <T> extracted Java type.
 * @author Paul Sandoz
 * @author Marek Potociar
 */
final class SingleValueExtractor<T> extends AbstractParamValueExtractor<T> implements MultivaluedParameterExtractor<T> {

    
Create new single value extractor.
Params:
converter –          string value reader.
parameterName –      string parameter name.
defaultStringValue – default string value./**
     * Create new single value extractor.
     *
     * @param converter          string value reader.
     * @param parameterName      string parameter name.
     * @param defaultStringValue default string value.
     */
    public SingleValueExtractor(final ParamConverter<T> converter, final String parameterName, final String defaultStringValue) {
        super(converter, parameterName, defaultStringValue);
    }

    
{@inheritDoc}
 This implementation extracts the value of the parameter applying the underlying param converter to the first value found in the list of potential multiple parameter values. Any other values in the multi-value list will be ignored. 
Params:
parameters – map of parameters.
Returns:
extracted single parameter value./**
     * {@inheritDoc}
     * <p/>
     * This implementation extracts the value of the parameter applying the underlying
     * {@link ParamConverter param converter} to the first value found in the list of potential multiple
     * parameter values. Any other values in the multi-value list will be ignored.
     *
     * @param parameters map of parameters.
     * @return extracted single parameter value.
     */
    @Override
    public T extract(final MultivaluedMap<String, String> parameters) {
        final String value = parameters.getFirst(getName());
        try {
            return fromString((value == null && isDefaultValueRegistered()) ? getDefaultValueString() : value);
        } catch (final WebApplicationException | ProcessingException ex) {
            throw ex;
        } catch (final IllegalArgumentException ex) {
            return defaultValue();
        } catch (final Exception ex) {
            throw new ExtractorException(ex);
        }
    }
}