/**
* 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.cxf.jaxrs.impl;
import javax.ws.rs.core.EntityTag;
import javax.ws.rs.ext.RuntimeDelegate.HeaderDelegate;
public class EntityTagHeaderProvider implements HeaderDelegate<EntityTag> {
private static final String WEAK_PREFIX = "W/";
public EntityTag fromString(String header) {
if (header == null) {
throw new IllegalArgumentException("ETag value can not be null");
}
if ("*".equals(header)) {
return new EntityTag("*");
}
String tag = null;
boolean weak = false;
int i = header.indexOf(WEAK_PREFIX);
if (i != -1) {
weak = true;
if (i + 2 < header.length()) {
tag = header.substring(i + 2);
} else {
return new EntityTag("", weak);
}
} else {
tag = header;
}
if (tag.length() < 2 || !tag.startsWith("\"") || !tag.endsWith("\"")) {
throw new IllegalArgumentException("Misformatted ETag : " + header);
}
tag = tag.length() == 2 ? "" : tag.substring(1, tag.length() - 1);
return new EntityTag(tag, weak);
}
public String toString(EntityTag tag) {
StringBuilder sb = new StringBuilder();
if (tag.isWeak()) {
sb.append(WEAK_PREFIX);
}
sb.append("\"").append(tag.getValue()).append("\"");
return sb.toString();
}
}