org.apache.wink.common.internal.providers.header.AcceptCharsetHeaderDelegate 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.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.AcceptCharset;
import org.apache.wink.common.internal.utils.SoftConcurrentMap;
public class AcceptCharsetHeaderDelegate implements HeaderDelegate {
private static final SoftConcurrentMap cache =
new SoftConcurrentMap();
public AcceptCharset fromString(String value) throws IllegalArgumentException {
AcceptCharset cached = cache.get(value);
if (cached != null) {
return cached;
}
List acceptable = new LinkedList();
List banned = new LinkedList();
boolean anyAllowed = (value == null);
// parse the Accept-Charset header
List vCharsets = parseAcceptCharset(value);
for (AcceptCharset.ValuedCharset qCharset : vCharsets) {
if (anyAllowed) {
if (qCharset.qValue == 0 && !qCharset.isWildcard()) {
banned.add(qCharset.charset);
}
} else {
if (qCharset.qValue == 0) {
break; // gone through all acceptable languages
}
if (qCharset.isWildcard()) {
anyAllowed = true;
} else {
acceptable.add(qCharset.charset);
}
}
}
return cache
.put(value, new AcceptCharset(value, acceptable, banned, anyAllowed, vCharsets));
}
private List parseAcceptCharset(String acceptableCharsetValue) {
List qCharsets = new LinkedList();
if (acceptableCharsetValue == null) {
return qCharsets;
}
for (String charsetRange : acceptableCharsetValue.split(",")) { //$NON-NLS-1$
int semicolonIndex = charsetRange.indexOf(';');
double qValue;
String charsetSpec;
if (semicolonIndex == -1) {
qValue = 1.0d;
charsetSpec = charsetRange;
} else {
charsetSpec = charsetRange.substring(0, semicolonIndex);
int equalsIndex = charsetRange.indexOf('=', semicolonIndex + 1);
String qString =
charsetRange.substring(equalsIndex != -1 ? equalsIndex + 1 : charsetRange
.length());
try {
qValue = Double.parseDouble(qString.trim());
} catch (NumberFormatException nfe) {
// silently ignore incorrect q-specification and assume 1
qValue = 1.0d;
}
}
charsetSpec = charsetSpec.trim();
if (charsetSpec.length() == 0) {
// ignore empty encoding specifications
continue;
} else if (charsetSpec.equals("*")) { //$NON-NLS-1$
qCharsets.add(new AcceptCharset.ValuedCharset(qValue, null));
} else {
qCharsets.add(new AcceptCharset.ValuedCharset(qValue, charsetSpec));
}
}
Collections.sort(qCharsets, Collections.reverseOrder());
return qCharsets;
}
public String toString(AcceptCharset value) {
return value.getAcceptCharsetHeader();
}
}