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Jersey core server implementation
/*
* 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.core.MultivaluedMap;
/**
* Extract value of the parameter by returning the first string parameter value
* found in the list of string parameter values.
*
* This class can be seen as a special, optimized, case of {@link SingleValueExtractor}.
*
* @author Paul Sandoz
* @author Marek Potociar
*/
final class SingleStringValueExtractor implements MultivaluedParameterExtractor {
private final String paramName;
private final String defaultValue;
/**
* Create new single string value extractor.
*
* @param parameterName string parameter name.
* @param defaultValue default value.
*/
public SingleStringValueExtractor(String parameterName, String defaultValue) {
this.paramName = parameterName;
this.defaultValue = defaultValue;
}
@Override
public String getName() {
return paramName;
}
@Override
public String getDefaultValueString() {
return defaultValue;
}
/**
* {@inheritDoc}
*
* This implementation return s the first String value found in the list of
* potential multiple string parameter values. Any other values in the multi-value
* list will be ignored.
*
* @param parameters map of parameters.
* @return extracted single string parameter value.
*/
@Override
public String extract(MultivaluedMap parameters) {
String value = parameters.getFirst(paramName);
return (value != null) ? value : defaultValue;
}
}