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package org.glassfish.jersey.message.internal;
import java.text.ParseException;
import javax.ws.rs.core.EntityTag;
import javax.inject.Singleton;
import org.glassfish.jersey.internal.LocalizationMessages;
import org.glassfish.jersey.message.internal.HttpHeaderReader.Event;
import org.glassfish.jersey.spi.HeaderDelegateProvider;
import static org.glassfish.jersey.message.internal.Utils.throwIllegalArgumentExceptionIfNull;
/**
* {@code ETag} {@link HeaderDelegateProvider header delegate provider}.
*
* @author Marc Hadley
* @author Marek Potociar (marek.potociar at oracle.com)
*/
@Singleton
public class EntityTagProvider implements HeaderDelegateProvider<EntityTag> {
@Override
public boolean supports(Class<?> type) {
return type == EntityTag.class;
}
@Override
public String toString(EntityTag header) {
throwIllegalArgumentExceptionIfNull(header, LocalizationMessages.ENTITY_TAG_IS_NULL());
StringBuilder b = new StringBuilder();
if (header.isWeak()) {
b.append("W/");
}
StringBuilderUtils.appendQuoted(b, header.getValue());
return b.toString();
}
@Override
public EntityTag fromString(String header) {
throwIllegalArgumentExceptionIfNull(header, LocalizationMessages.ENTITY_TAG_IS_NULL());
try {
HttpHeaderReader reader = HttpHeaderReader.newInstance(header);
Event e = reader.next(false);
if (e == Event.QuotedString) {
return new EntityTag(reader.getEventValue());
} else if (e == Event.Token) {
if (reader.getEventValue().equals("W")) {
reader.nextSeparator('/');
return new EntityTag(reader.nextQuotedString(), true);
}
}
} catch (ParseException ex) {
throw new IllegalArgumentException(
"Error parsing entity tag '" + header + "'", ex);
}
throw new IllegalArgumentException(
"Error parsing entity tag '" + header + "'");
}
}