| /* |
| * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/message/BasicHeaderElementIterator.java $ |
| * $Revision: 592088 $ |
| * $Date: 2007-11-05 09:03:39 -0800 (Mon, 05 Nov 2007) $ |
| * |
| * ==================================================================== |
| * 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.http.message; |
| |
| import java.util.NoSuchElementException; |
| |
| import org.apache.http.FormattedHeader; |
| import org.apache.http.Header; |
| import org.apache.http.HeaderElement; |
| import org.apache.http.HeaderElementIterator; |
| import org.apache.http.HeaderIterator; |
| import org.apache.http.util.CharArrayBuffer; |
| |
| /** |
| * Basic implementation of a {@link HeaderElementIterator}. |
| * |
| * @version $Revision: 592088 $ |
| * |
| * @author Andrea Selva <selva.andre at gmail.com> |
| * @author Oleg Kalnichevski <oleg at ural.ru> |
| */ |
| public class BasicHeaderElementIterator implements HeaderElementIterator { |
| |
| private final HeaderIterator headerIt; |
| private final HeaderValueParser parser; |
| |
| private HeaderElement currentElement = null; |
| private CharArrayBuffer buffer = null; |
| private ParserCursor cursor = null; |
| |
| /** |
| * Creates a new instance of BasicHeaderElementIterator |
| */ |
| public BasicHeaderElementIterator( |
| final HeaderIterator headerIterator, |
| final HeaderValueParser parser) { |
| if (headerIterator == null) { |
| throw new IllegalArgumentException("Header iterator may not be null"); |
| } |
| if (parser == null) { |
| throw new IllegalArgumentException("Parser may not be null"); |
| } |
| this.headerIt = headerIterator; |
| this.parser = parser; |
| } |
| |
| |
| public BasicHeaderElementIterator(final HeaderIterator headerIterator) { |
| this(headerIterator, BasicHeaderValueParser.DEFAULT); |
| } |
| |
| |
| private void bufferHeaderValue() { |
| this.cursor = null; |
| this.buffer = null; |
| while (this.headerIt.hasNext()) { |
| Header h = this.headerIt.nextHeader(); |
| if (h instanceof FormattedHeader) { |
| this.buffer = ((FormattedHeader) h).getBuffer(); |
| this.cursor = new ParserCursor(0, this.buffer.length()); |
| this.cursor.updatePos(((FormattedHeader) h).getValuePos()); |
| break; |
| } else { |
| String value = h.getValue(); |
| if (value != null) { |
| this.buffer = new CharArrayBuffer(value.length()); |
| this.buffer.append(value); |
| this.cursor = new ParserCursor(0, this.buffer.length()); |
| break; |
| } |
| } |
| } |
| } |
| |
| private void parseNextElement() { |
| // loop while there are headers left to parse |
| while (this.headerIt.hasNext() || this.cursor != null) { |
| if (this.cursor == null || this.cursor.atEnd()) { |
| // get next header value |
| bufferHeaderValue(); |
| } |
| // Anything buffered? |
| if (this.cursor != null) { |
| // loop while there is data in the buffer |
| while (!this.cursor.atEnd()) { |
| HeaderElement e = this.parser.parseHeaderElement(this.buffer, this.cursor); |
| if (!(e.getName().length() == 0 && e.getValue() == null)) { |
| // Found something |
| this.currentElement = e; |
| return; |
| } |
| } |
| // if at the end of the buffer |
| if (this.cursor.atEnd()) { |
| // discard it |
| this.cursor = null; |
| this.buffer = null; |
| } |
| } |
| } |
| } |
| |
| public boolean hasNext() { |
| if (this.currentElement == null) { |
| parseNextElement(); |
| } |
| return this.currentElement != null; |
| } |
| |
| public HeaderElement nextElement() throws NoSuchElementException { |
| if (this.currentElement == null) { |
| parseNextElement(); |
| } |
| |
| if (this.currentElement == null) { |
| throw new NoSuchElementException("No more header elements available"); |
| } |
| |
| HeaderElement element = this.currentElement; |
| this.currentElement = null; |
| return element; |
| } |
| |
| public final Object next() throws NoSuchElementException { |
| return nextElement(); |
| } |
| |
| public void remove() throws UnsupportedOperationException { |
| throw new UnsupportedOperationException("Remove not supported"); |
| } |
| |
| } |