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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.tomcat.util.http.parser;
import java.io.IOException;
import java.io.Reader;
import org.apache.tomcat.util.http.parser.StructuredField.SfBoolean;
import org.apache.tomcat.util.http.parser.StructuredField.SfDictionary;
import org.apache.tomcat.util.http.parser.StructuredField.SfInteger;
import org.apache.tomcat.util.http.parser.StructuredField.SfListMember;
/**
* HTTP priority header parser as per RFC 9218.
*/
public class Priority {
public static final int DEFAULT_URGENCY = 3;
public static final boolean DEFAULT_INCREMENTAL = false;
// Explicitly set the defaults as per RFC 9218
private int urgency = DEFAULT_URGENCY;
private boolean incremental = DEFAULT_INCREMENTAL;
public Priority() {
// Default constructor is NO-OP.
}
public int getUrgency() {
return urgency;
}
public void setUrgency(int urgency) {
this.urgency = urgency;
}
public boolean getIncremental() {
return incremental;
}
public void setIncremental(boolean incremental) {
this.incremental = incremental;
}
/**
* Parsers an HTTP header as a Priority header as defined by RFC 9218.
*
* @param input The header to parse
*
* @return The resulting priority
*
* @throws IOException If an I/O error occurs while reading the input
*/
public static Priority parsePriority(Reader input) throws IOException {
Priority result = new Priority();
SfDictionary dictionary = StructuredField.parseSfDictionary(input);
SfListMember urgencyListMember = dictionary.getDictionaryMember("u");
// If not an integer, ignore it
if (urgencyListMember instanceof SfInteger) {
long urgency = ((SfInteger) urgencyListMember).getVaue().longValue();
// If out of range, ignore it
if (urgency > -1 && urgency < 8) {
result.setUrgency((int) urgency);
}
}
SfListMember incrementalListMember = dictionary.getDictionaryMember("i");
// If not a boolean, ignore it
if (incrementalListMember instanceof SfBoolean) {
result.setIncremental(((SfBoolean) incrementalListMember).getVaue().booleanValue());
}
return result;
}
}
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