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package org.glassfish.jersey.client.filter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.logging.Logger;
import javax.ws.rs.client.ClientRequestContext;
import javax.ws.rs.client.ClientRequestFilter;
import javax.ws.rs.core.HttpHeaders;
import javax.inject.Inject;
import org.glassfish.jersey.client.ClientConfig;
import org.glassfish.jersey.client.ClientProperties;
import org.glassfish.jersey.client.internal.LocalizationMessages;
import org.glassfish.jersey.internal.inject.InjectionManager;
import org.glassfish.jersey.spi.ContentEncoder;
/**
* Client filter adding support for {@link org.glassfish.jersey.spi.ContentEncoder content encoding}. The filter adds
* list of supported encodings to the Accept-Header values.
* Supported encodings are determined by looking
* up all the {@link org.glassfish.jersey.spi.ContentEncoder} implementations registered in the corresponding
* {@link ClientConfig client configuration}.
* <p>
* If {@link ClientProperties#USE_ENCODING} client property is set, the filter will add Content-Encoding header with
* the value of the property, unless Content-Encoding header has already been set.
* </p>
*
* @author Martin Matula
*/
public final class EncodingFilter implements ClientRequestFilter {
@Inject
private InjectionManager injectionManager;
private volatile List<Object> supportedEncodings = null;
@Override
public void filter(ClientRequestContext request) throws IOException {
if (getSupportedEncodings().isEmpty()) {
return;
}
request.getHeaders().addAll(HttpHeaders.ACCEPT_ENCODING, getSupportedEncodings());
String useEncoding = (String) request.getConfiguration().getProperty(ClientProperties.USE_ENCODING);
if (useEncoding != null) {
if (!getSupportedEncodings().contains(useEncoding)) {
Logger.getLogger(getClass().getName()).warning(LocalizationMessages.USE_ENCODING_IGNORED(
ClientProperties.USE_ENCODING, useEncoding, getSupportedEncodings()));
} else {
if (request.hasEntity()) { // don't add Content-Encoding header for requests with no entity
if (request.getHeaders().getFirst(HttpHeaders.CONTENT_ENCODING) == null) {
request.getHeaders().putSingle(HttpHeaders.CONTENT_ENCODING, useEncoding);
}
}
}
}
}
List<Object> getSupportedEncodings() {
// no need for synchronization - in case of a race condition, the property
// may be set twice, but it does not break anything
if (supportedEncodings == null) {
SortedSet<String> se = new TreeSet<>();
List<ContentEncoder> encoders = injectionManager.getAllInstances(ContentEncoder.class);
for (ContentEncoder encoder : encoders) {
se.addAll(encoder.getSupportedEncodings());
}
supportedEncodings = new ArrayList<>(se);
}
return supportedEncodings;
}
}