| /* |
| * ==================================================================== |
| * 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. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| |
| package org.apache.hc.core5.http.message; |
| |
| import java.util.ArrayList; |
| import java.util.BitSet; |
| import java.util.List; |
| |
| import org.apache.hc.core5.annotation.Contract; |
| import org.apache.hc.core5.annotation.ThreadingBehavior; |
| import org.apache.hc.core5.http.HeaderElement; |
| import org.apache.hc.core5.http.NameValuePair; |
| import org.apache.hc.core5.util.Args; |
| import org.apache.hc.core5.util.Tokenizer; |
| |
| /** |
| * Default {@link org.apache.hc.core5.http.message.HeaderValueParser} implementation. |
| * |
| * @since 4.0 |
| */ |
| @Contract(threading = ThreadingBehavior.IMMUTABLE) |
| public class BasicHeaderValueParser implements HeaderValueParser { |
| |
| public final static BasicHeaderValueParser INSTANCE = new BasicHeaderValueParser(); |
| |
| private final static char PARAM_DELIMITER = ';'; |
| private final static char ELEM_DELIMITER = ','; |
| |
| // IMPORTANT! |
| // These private static variables must be treated as immutable and never exposed outside this class |
| private static final BitSet TOKEN_DELIMS = Tokenizer.INIT_BITSET('=', PARAM_DELIMITER, ELEM_DELIMITER); |
| private static final BitSet VALUE_DELIMS = Tokenizer.INIT_BITSET(PARAM_DELIMITER, ELEM_DELIMITER); |
| |
| private final Tokenizer tokenizer; |
| |
| public BasicHeaderValueParser() { |
| this.tokenizer = Tokenizer.INSTANCE; |
| } |
| |
| /** |
| * An empty immutable {@code HeaderElement} array. |
| */ |
| private static final HeaderElement[] EMPTY_HEADER_ELEMENT_ARRAY = new HeaderElement[0]; |
| |
| /** |
| * An empty immutable {@code NameValuePair} array. |
| */ |
| private static final NameValuePair[] EMPTY_NAME_VALUE_ARRAY = new NameValuePair[0]; |
| |
| @Override |
| public HeaderElement[] parseElements(final CharSequence buffer, final ParserCursor cursor) { |
| Args.notNull(buffer, "Char sequence"); |
| Args.notNull(cursor, "Parser cursor"); |
| final List<HeaderElement> elements = new ArrayList<>(); |
| while (!cursor.atEnd()) { |
| final HeaderElement element = parseHeaderElement(buffer, cursor); |
| if (!(element.getName().isEmpty() && element.getValue() == null)) { |
| elements.add(element); |
| } |
| } |
| return elements.toArray(EMPTY_HEADER_ELEMENT_ARRAY); |
| } |
| |
| @Override |
| public HeaderElement parseHeaderElement(final CharSequence buffer, final ParserCursor cursor) { |
| Args.notNull(buffer, "Char sequence"); |
| Args.notNull(cursor, "Parser cursor"); |
| final NameValuePair nvp = parseNameValuePair(buffer, cursor); |
| NameValuePair[] params = null; |
| if (!cursor.atEnd()) { |
| final char ch = buffer.charAt(cursor.getPos() - 1); |
| if (ch != ELEM_DELIMITER) { |
| params = parseParameters(buffer, cursor); |
| } |
| } |
| return new BasicHeaderElement(nvp.getName(), nvp.getValue(), params); |
| } |
| |
| @Override |
| public NameValuePair[] parseParameters(final CharSequence buffer, final ParserCursor cursor) { |
| Args.notNull(buffer, "Char sequence"); |
| Args.notNull(cursor, "Parser cursor"); |
| tokenizer.skipWhiteSpace(buffer, cursor); |
| final List<NameValuePair> params = new ArrayList<>(); |
| while (!cursor.atEnd()) { |
| final NameValuePair param = parseNameValuePair(buffer, cursor); |
| params.add(param); |
| final char ch = buffer.charAt(cursor.getPos() - 1); |
| if (ch == ELEM_DELIMITER) { |
| break; |
| } |
| } |
| return params.toArray(EMPTY_NAME_VALUE_ARRAY); |
| } |
| |
| @Override |
| public NameValuePair parseNameValuePair(final CharSequence buffer, final ParserCursor cursor) { |
| Args.notNull(buffer, "Char sequence"); |
| Args.notNull(cursor, "Parser cursor"); |
| |
| final String name = tokenizer.parseToken(buffer, cursor, TOKEN_DELIMS); |
| if (cursor.atEnd()) { |
| return new BasicNameValuePair(name, null); |
| } |
| final int delim = buffer.charAt(cursor.getPos()); |
| cursor.updatePos(cursor.getPos() + 1); |
| if (delim != '=') { |
| return new BasicNameValuePair(name, null); |
| } |
| final String value = tokenizer.parseValue(buffer, cursor, VALUE_DELIMS); |
| if (!cursor.atEnd()) { |
| cursor.updatePos(cursor.getPos() + 1); |
| } |
| return new BasicNameValuePair(name, value); |
| } |
| |
| } |
| |