org.apache.wink.client.internal.handlers.AcceptHeaderHandler Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.wink.client.internal.handlers;
import java.util.Set;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import org.apache.wink.client.ClientRequest;
import org.apache.wink.client.ClientResponse;
import org.apache.wink.client.handlers.ClientHandler;
import org.apache.wink.client.handlers.HandlerContext;
import org.apache.wink.common.internal.i18n.Messages;
import org.apache.wink.common.internal.registry.ProvidersRegistry;
import org.apache.wink.common.internal.runtime.RuntimeContextTLS;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Provides support for setting the Accept header automatically.
*/
public class AcceptHeaderHandler implements ClientHandler {
private static final Logger logger = LoggerFactory.getLogger(AcceptHeaderHandler.class);
public ClientResponse handle(ClientRequest request, HandlerContext context) throws Exception {
MultivaluedMap requestHeaders = request.getHeaders();
if (requestHeaders.getFirst(HttpHeaders.ACCEPT) == null) {
Object responseEntityClassType =
request.getAttributes().get(ClientRequestImpl.RESPONSE_ENTITY_CLASS_TYPE);
if (responseEntityClassType != null) {
Class classType = (Class)responseEntityClassType;
if (!classType.isAssignableFrom(ClientResponse.class)) {
logger.trace("Response entity class is: {}", classType); //$NON-NLS-1$
Set mediaTypes =
request
.getAttribute(ProvidersRegistry.class)
.getMessageBodyReaderMediaTypesLimitByIsReadable(classType,
RuntimeContextTLS
.getRuntimeContext());
logger.trace("Found media types: {}", mediaTypes); //$NON-NLS-1$
StringBuffer acceptHeader = new StringBuffer();
boolean isFirst = true;
for (MediaType mt : mediaTypes) {
if (!isFirst) {
acceptHeader.append(","); //$NON-NLS-1$
}
acceptHeader.append(mt.toString());
isFirst = false;
}
if (acceptHeader.length() > 0) {
String acceptValue = acceptHeader.toString();
requestHeaders.add(HttpHeaders.ACCEPT, acceptValue);
logger.info(Messages.getMessage("clientAcceptHeaderHandlerSetAccept", //$NON-NLS-1$
acceptValue));
}
}
}
}
return context.doChain(request);
}
}