com.holonplatform.jaxrs.server.internal.RequestUtils Maven / Gradle / Ivy
/*
* Copyright 2016-2017 Axioma srl.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.holonplatform.jaxrs.server.internal;
import java.io.Serializable;
import java.util.List;
import java.util.Optional;
import javax.ws.rs.core.MultivaluedMap;
/**
* Utility class to handle requests.
*
* @since 5.0.0
*/
public class RequestUtils implements Serializable {
private static final long serialVersionUID = -8932866380055499648L;
private RequestUtils() {
}
/**
* Get a URI query parameter value by name
* @param queryParameters URI query parameters
* @param name Parameter name
* @return Parameter value, or null if not found
*/
public static Optional getQueryParameterValue(MultivaluedMap queryParameters, String name) {
if (name != null) {
if (queryParameters != null && queryParameters.containsKey(name)) {
List values = queryParameters.get(name);
if (values != null && !values.isEmpty()) {
if (values.size() == 1) {
return Optional.ofNullable(values.get(0));
} else {
StringBuilder sb = new StringBuilder();
for (String value : values) {
if (sb.length() > 0) {
sb.append(',');
}
sb.append(value);
}
return Optional.of(sb.toString());
}
}
}
}
return Optional.empty();
}
}