wbxmldecoder.java~3~

jwap 协议 udp 可以用于手机通讯

		while (maskedTokenValue != 01) { // END (of parent element)
			byte actualTokenValue = getTokenValue(maskedTokenValue);
			if (isInlineStrToken(maskedTokenValue)) // element has text content
				writeContentAsInlineStr(parent);
			else {
				if (isEntityToken(actualTokenValue)) // element has entity
					writeEntityContent(parent);
				else if (maskedTokenValue == GlobalTokens.OPAQUE)
					// element contains opaque data
					writeOpaqueContent(parent);
				else if (isStringTableReferenceToken(maskedTokenValue)) {
					byte indexInStringTable = wbxmlStream.readByte();
					writeContentFromStrTable(parent, indexInStringTable);
				} else if (actualTokenValue == GlobalTokens.SWITCH_PAGE) {
					byte codepageNo = wbxmlStream.readByte();
					TokenRepository.setCurrentCodepage(codepageNo);
					// TODO specify namespace with xmlns attribute
				} else {
					String elementName =
						tokenRepository.getTagName(actualTokenValue);

					Element childElement =
						xmlDocument.createElement(elementName);
					//childElement.setPrefix(tokenRepository.getCurrentNamespace());
					parent.appendChild(childElement);
					if (hasAttributes(maskedTokenValue))
						setAttributes(childElement);
					if (hasContent(maskedTokenValue)) {
						writeChildElement(childElement);
						maskedTokenValue = wbxmlStream.readByte();
						continue;
					}
				}

			}
			maskedTokenValue = wbxmlStream.readByte();
		}
	}

	private void writeContentFromStrTable(
		Element parent,
		int indexInStringTable) {
		char c = 0x0;
		int endIndex =
			stringTable.toString().indexOf(
				new String(new char[] { c }),
				indexInStringTable);
		String content = stringTable.substring(indexInStringTable, endIndex);
		Text txtContent = xmlDocument.createTextNode(content);
		parent.appendChild(txtContent);
	}

	private boolean hasAttributes(byte tokenValue) {
		return ((tokenValue & attributeBitMask) == attributeBitMask);
	}

	private boolean hasContent(byte tokenValue) {
		return (tokenValue & parentBitMask) == parentBitMask;
	}

	private void setAttributes(Element element) throws IOException {
		byte attrTokenValue = wbxmlStream.readByte();
		String currentAttrName = "";
		while (attrTokenValue != 01) { // END (of attribue list)
			if (isInlineStrToken(attrTokenValue))
				writeAttrValueAsInlineStr(element, currentAttrName);
			else {
				if (isEntityToken(attrTokenValue))
					writeEntityAsAttribute(element, currentAttrName);
				else if (isStringTableReferenceToken(attrTokenValue)) {
					byte indexInStringTable = wbxmlStream.readByte();
					writeAttributeFromStrTable(
						element,
						currentAttrName,
						indexInStringTable);
				} else {
					if (isAttrNameToken(attrTokenValue))
						currentAttrName =
							writeAttribute(element, attrTokenValue);
					else {
						if (isAttrValueToken(attrTokenValue))
							writeAttrValue(
								element,
								currentAttrName,
								attrTokenValue);
					}
				}
			}
			attrTokenValue = wbxmlStream.readByte();
		}

	}

	private String writeAttribute(Element element, byte attrTokenValue) {
		String[] attributeNameAndPrefix =
			tokenRepository.getAttributeNameAndPrefix(attrTokenValue);
		String attributeValue = "";
		String attributeName = attributeNameAndPrefix[0].toString();
		boolean hasPrefix = attributeNameAndPrefix[1] != null;
		if (hasPrefix)
			attributeValue = attributeNameAndPrefix[1].trim();
		Attr attrNode = xmlDocument.createAttribute(attributeName);
		attrNode.setValue(attributeValue);
		element.setAttributeNode(attrNode);
		return attributeName;
	}

	private void writeAttrValue(
		Element element,
		String attrName,
		byte attrTokenValue)
		throws IOException {
		String partialAttrValue = element.getAttribute(attrName);
		String attrValue =
			partialAttrValue
				+ tokenRepository.getAttributeValue(attrTokenValue);
		element.setAttribute(attrName, attrValue);
	}

	private void writeAttributeFromStrTable(
		Element element,
		String attrName,
		byte indexInStringTable) {
		String partialAttrValue = element.getAttribute(attrName);
		char c = 0x0;
		int endIndex =
			stringTable.toString().indexOf(
				new String(new char[] { c }),
				indexInStringTable);
		String attrValue =
			partialAttrValue
				+ stringTable.substring(indexInStringTable, endIndex);
		element.setAttribute(attrName, attrValue);

	}

	private void writeAttrValueAsInlineStr(Element element, String attrName)
		throws IOException {
		byte aChar = wbxmlStream.readByte();
		byte[] content = new byte[1024];
		int count = 0;
		while (aChar != 0x0) {
			content[count++] = aChar;
			aChar = wbxmlStream.readByte();
		}

		String previous_value = element.getAttribute(attrName);
		StringBuffer attrValue =
			new StringBuffer(
				previous_value.equals("null") ? "" : previous_value);
		attrValue =
			attrValue.append(new String(content, 0, count, this.encoding));
		element.setAttribute(attrName, attrValue.toString());
	}

	private void writeEntityAsAttribute(Element element, String attrName)
		throws IOException {
		String previous_value = element.getAttribute(attrName);
		StringBuffer attrValue =
			new StringBuffer(
				previous_value.equals("null") ? "" : previous_value);

		byte aChar = wbxmlStream.readByte();
		while ((aChar & (byte) 0x80) == 0x80) {
			// is aChar's continuation flag(MSB) is on)
			aChar = (byte) (aChar & 0x7f); //extract remaining 7 bits;
			String str1 = Integer.toString(aChar, 2);
			attrValue.append(str1);
			aChar = wbxmlStream.readByte();
		}

		String str2 = Integer.toString(aChar, 2);
		// last byte in multiple byte format
		while (str2.length() < 7)
			str2 = "0" + str2;
		attrValue.append(str2);
		int multipleByteValue = Integer.parseInt(attrValue.toString(), 2);
		element.setAttribute(attrName, "&#" + multipleByteValue + ";");
	}

	private void writeContentAsInlineStr(Element element) throws IOException {
		byte aChar = wbxmlStream.readByte();
		byte[] content = new byte[1024];
		int count = 0;
		while (aChar != 0x0) {
			content[count++] = aChar;
			aChar = wbxmlStream.readByte();
		}
		String attrValue = new String(content, 0, count, this.encoding);
		Text txtContent = xmlDocument.createTextNode(attrValue);
		element.appendChild(txtContent);
	}

	private boolean isEntityToken(byte tokenValue) {
		return tokenValue == GlobalTokens.ENTITY;
		// todo for other global tokens
	}

	private boolean isStringTableReferenceToken(byte tokenValue) {
		return tokenValue == GlobalTokens.STR_T;
	}

	private void writeEntityContent(Element element) throws IOException {
		StringBuffer attrValue = new StringBuffer();
		byte aChar = wbxmlStream.readByte();
		while ((aChar & (byte) 0x80) == 0x80) {
			// is aChar's continuation flag(MSB) is on)
			aChar = (byte) (aChar & 0x7f); //extract remaining 7 bits;
			String str1 = Integer.toString(aChar, 2);
			attrValue.append(str1);
			aChar = wbxmlStream.readByte();
		}

		String str2 = Integer.toString(aChar, 2);
		// last byte in multiple byte format
		while (str2.length() < 7)
			str2 = "0" + str2;
		attrValue.append(str2);
		int multipleByteValue = Integer.parseInt(attrValue.toString(), 2);
		Text txtContent =
			xmlDocument.createTextNode(Integer.toString(multipleByteValue));
		element.appendChild(txtContent);
	}

	private void writeOpaqueContent(Element element) throws IOException {
		//	StringBuffer opaqueData = new StringBuffer();
		byte lengthOfOpaqueData = wbxmlStream.readByte();
		// TODO for multi-byte length
		byte[] opaqueDataBuf = new byte[lengthOfOpaqueData];
		for (int i = 0; i < lengthOfOpaqueData; i++) {
			opaqueDataBuf[i] = wbxmlStream.readByte();

		}
		byte b = wbxmlStream.readByte();
		while (b != 1) {
			b = wbxmlStream.readByte();
		}
		String opaqueDataStr = new String(opaqueDataBuf, this.encoding);
		Text txtContent = xmlDocument.createTextNode("");
		//System.out.println("Opaque____" + opaqueDataStr);
		element.appendChild(txtContent);
	}
	private boolean isInlineStrToken(byte tokenValue) {
		return tokenValue == GlobalTokens.STR_ISTR_I;
	}

	private boolean isAttrNameToken(byte tokenValue) {
		return (tokenValue >= 0); // tokenValue is positive implies MSB is 0
	}

	private boolean isAttrValueToken(byte tokenValue) {
		return (tokenValue < 0);
		// tokenValue is negative that implies MSB is 1
	}

	private byte getTokenValue(byte maskedTokenValue) {
		byte unmaskedTokenValue = (byte) (maskedTokenValue & ((byte) 0x3f));
		// 3f =~ 0011 1111
		return unmaskedTokenValue;
	}

}