org.apache.wink.common.internal.providers.header.AcceptEncodingHeaderDelegate Maven / Gradle / Ivy
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package org.apache.wink.common.internal.providers.header;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import javax.ws.rs.ext.RuntimeDelegate.HeaderDelegate;
import org.apache.wink.common.internal.http.AcceptEncoding;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class AcceptEncodingHeaderDelegate implements HeaderDelegate {
final private static Logger logger =
LoggerFactory
.getLogger(AcceptEncodingHeaderDelegate.class);
public AcceptEncoding fromString(String value) throws IllegalArgumentException {
List acceptable = new LinkedList();
List banned = new LinkedList();
boolean anyAllowed = (value == null);
// parse the Accept-Encoding header
List vEncodings = parseAcceptEncoding(value);
for (AcceptEncoding.ValuedEncoding qEncoding : vEncodings) {
logger.trace("Processing {} with qValue {}", qEncoding.encoding, qEncoding.qValue); //$NON-NLS-1$
if (anyAllowed) {
logger.trace("anyAllowed is true"); //$NON-NLS-1$
if (qEncoding.qValue == 0 && !qEncoding.isWildcard()) {
logger.trace("qValue is 0 and qEncoding is not a wildcard so {} is banned", //$NON-NLS-1$
qEncoding.encoding);
banned.add(qEncoding.encoding);
}
} else {
logger.trace("anyAllowed is still false"); //$NON-NLS-1$
if (qEncoding.qValue == 0) {
logger.trace("qValue is 0 so breaking out of loop"); //$NON-NLS-1$
break; // gone through all acceptable languages
}
if (qEncoding.isWildcard()) {
logger.trace("qEncoding is a wildcard so everything afterwards is allowable"); //$NON-NLS-1$
anyAllowed = true;
} else {
logger.trace("qEncoding is not a wildcard so adding to acceptable list"); //$NON-NLS-1$
acceptable.add(qEncoding.encoding);
}
}
}
return new AcceptEncoding(value, acceptable, banned, anyAllowed, vEncodings);
}
private List parseAcceptEncoding(String acceptableEncodingValue) {
logger.trace("parseAcceptEncoding({}) entry", acceptableEncodingValue); //$NON-NLS-1$
List qEncodings =
new LinkedList();
if (acceptableEncodingValue == null) {
logger.trace("parseAcceptEncoding() exit - return empty list"); //$NON-NLS-1$
return qEncodings;
}
for (String encodingRange : acceptableEncodingValue.split(",")) { //$NON-NLS-1$
logger.trace("Parsing encodingRange as {}", encodingRange); //$NON-NLS-1$
int semicolonIndex = encodingRange.indexOf(';');
double qValue;
String encodingSpec;
if (semicolonIndex == -1) {
qValue = 1.0d;
encodingSpec = encodingRange;
} else {
encodingSpec = encodingRange.substring(0, semicolonIndex);
int equalsIndex = encodingRange.indexOf('=', semicolonIndex + 1);
String qString =
encodingRange.substring(equalsIndex != -1 ? equalsIndex + 1 : encodingRange
.length());
try {
qValue = Double.parseDouble(qString.trim());
} catch (NumberFormatException nfe) {
// silently ignore incorrect q-specification and assume 1
qValue = 1.0d;
}
}
logger.trace("encodingSpec before trim is {}", encodingSpec); //$NON-NLS-1$
logger.trace("qValue is {}", qValue); //$NON-NLS-1$
encodingSpec = encodingSpec.trim();
if (encodingSpec.length() == 0) {
// ignore empty encoding specifications
logger.trace("ignoring empty encodingSpec"); //$NON-NLS-1$
continue;
} else if (encodingSpec.equals("*")) { //$NON-NLS-1$
logger.trace("Wildcard spec so adding as wildcard"); //$NON-NLS-1$
qEncodings.add(new AcceptEncoding.ValuedEncoding(qValue, null));
} else {
qEncodings.add(new AcceptEncoding.ValuedEncoding(qValue, encodingSpec));
}
}
Collections.sort(qEncodings, Collections.reverseOrder());
logger.trace("parseAcceptEncoding exit() returning {}", qEncodings); //$NON-NLS-1$
return qEncodings;
}
public String toString(AcceptEncoding value) {
return value.getAcceptEncodingHeader();
}
}