parserdf.java

flash xmp sdk,flash官方SDK

				{
					Node currChild = xmlNode.getChildNodes().item(i);
					if (currChild.getNodeType() != Node.TEXT_NODE)
					{
						rdf_ResourcePropertyElement (xmp, xmpParent, xmlNode, isTopLevel);
						return;
					}
				}
				
				rdf_LiteralPropertyElement (xmp, xmpParent, xmlNode, isTopLevel);
			}
			else
			{
				rdf_EmptyPropertyElement (xmp, xmpParent, xmlNode, isTopLevel);
			}
		}		
	}

	
	/**
	 * 7.2.15 resourcePropertyElt
	 *		start-element ( URI == propertyElementURIs, attributes == set ( idAttr? ) )
	 *		ws* nodeElement ws*
	 *		end-element()
	 *
	 * This handles structs using an rdf:Description node, 
	 * arrays using rdf:Bag/Seq/Alt, and typedNodes. It also catches and cleans up qualified 
	 * properties written with rdf:Description and rdf:value.
	 * 
	 * @param xmp the xmp metadata object that is generated
	 * @param xmpParent the parent xmp node
	 * @param xmlNode the currently processed XML node
	 * @param isTopLevel Flag if the node is a top-level node
	 * @throws XMPException thown on parsing errors
	 */
	private static void rdf_ResourcePropertyElement(XMPMetaImpl xmp, XMPNode xmpParent,
			Node xmlNode, boolean isTopLevel) throws XMPException
	{
		if (isTopLevel  &&  "iX:changes".equals(xmlNode.getNodeName()))
		{
			// Strip old "punchcard" chaff which has on the prefix "iX:".
			return;	
		}
		
		XMPNode newCompound = addChildNode(xmp, xmpParent, xmlNode, "", isTopLevel);
		
		// walk through the attributes
		for (int i = 0; i < xmlNode.getAttributes().getLength(); i++)
		{
			Node attribute = xmlNode.getAttributes().item(i);
			if ("xmlns".equals(attribute.getPrefix())  ||
					(attribute.getPrefix() == null  &&  "xmlns".equals(attribute.getNodeName())))
			{
				continue;
			}
			
			String attrLocal = attribute.getLocalName();
			String attrNS = attribute.getNamespaceURI();
			if (XML_LANG.equals(attribute.getNodeName()))
			{
				addQualifierNode (newCompound, XML_LANG, attribute.getNodeValue());
			} 
			else if ("ID".equals(attrLocal)  &&  NS_RDF.equals(attrNS))
			{
				continue;	// Ignore all rdf:ID attributes.
			}
			else
			{
				throw new XMPException(
					"Invalid attribute for resource property element", BADRDF);
			}
		}

		// walk through the children
		
		Node currChild = null;
		boolean found = false;
		int i;
		for (i = 0; i < xmlNode.getChildNodes().getLength(); i++)
		{
			currChild = xmlNode.getChildNodes().item(i);
			if (!isWhitespaceNode(currChild))
			{
				if (currChild.getNodeType() == Node.ELEMENT_NODE  &&  !found)
				{
					boolean isRDF = NS_RDF.equals(currChild.getNamespaceURI());
					String childLocal = currChild.getLocalName();
					
					if (isRDF  &&  "Bag".equals(childLocal))
					{
						newCompound.getOptions().setArray(true);
					}
					else if (isRDF  &&  "Seq".equals(childLocal))
					{
						newCompound.getOptions().setArray(true).setArrayOrdered(true);
					}
					else if (isRDF  &&  "Alt".equals(childLocal))
					{
						newCompound.getOptions().setArray(true).setArrayOrdered(true)
								.setArrayAlternate(true);
					}
					else
					{
						newCompound.getOptions().setStruct(true);
						if (!isRDF  &&  !"Description".equals(childLocal))
						{
							String typeName = currChild.getNamespaceURI();
							if (typeName == null)
							{
								throw new XMPException(
										"All XML elements must be in a namespace", BADXMP);
							}
							typeName += ':' + childLocal;
							addQualifierNode (newCompound, "rdf:type", typeName);
						}
					}
	
					rdf_NodeElement (xmp, newCompound, currChild, false);
					
					if (newCompound.getHasValueChild())
					{
						fixupQualifiedNode (newCompound);
					} 
					else if (newCompound.getOptions().isArrayAlternate())
					{
						XMPNodeUtils.detectAltText(newCompound);
					}				
					
					found = true;
					break;
				}
				else if (found)
				{
					// found second child element
					throw new XMPException(
						"Invalid child of resource property element", BADRDF);
				}
				else
				{
					throw new XMPException(
						"Children of resource property element must be XML elements", BADRDF);
				}
			}
		}
		
		if (!found)
		{
			// didn't found any child elements
			throw new XMPException("Missing child of resource property element", BADRDF);
		}
	}	

	
	/**
	 * 7.2.16 literalPropertyElt
	 *		start-element ( URI == propertyElementURIs, 
	 *				attributes == set ( idAttr?, datatypeAttr?) )
	 *		text()
	 *		end-element()
	 *
	 * Add a leaf node with the text value and qualifiers for the attributes.
	 * @param xmp the xmp metadata object that is generated
	 * @param xmpParent the parent xmp node
	 * @param xmlNode the currently processed XML node
	 * @param isTopLevel Flag if the node is a top-level node
	 * @throws XMPException thown on parsing errors
	 */	
	private static void rdf_LiteralPropertyElement(XMPMetaImpl xmp, XMPNode xmpParent,
			Node xmlNode, boolean isTopLevel) throws XMPException
	{
		XMPNode newChild = addChildNode (xmp, xmpParent, xmlNode, null, isTopLevel);
		
		for (int i = 0; i < xmlNode.getAttributes().getLength(); i++)
		{
			Node attribute = xmlNode.getAttributes().item(i);
			if ("xmlns".equals(attribute.getPrefix())  ||
					(attribute.getPrefix() == null  &&  "xmlns".equals(attribute.getNodeName())))
			{
				continue;
			}
			
			String attrNS = attribute.getNamespaceURI();
			String attrLocal = attribute.getLocalName();
			if (XML_LANG.equals(attribute.getNodeName()))
			{
				addQualifierNode(newChild, XML_LANG, attribute.getNodeValue());
			} 
			else if (NS_RDF.equals(attrNS)  &&
					 ("ID".equals(attrLocal)  ||  "datatype".equals(attrLocal)))
			{
				continue;	// Ignore all rdf:ID and rdf:datatype attributes.
			}
			else
			{
				throw new XMPException(
					"Invalid attribute for literal property element", BADRDF);
			}
		}
		String textValue = "";
		for (int i = 0; i < xmlNode.getChildNodes().getLength(); i++)
		{
			Node child = xmlNode.getChildNodes().item(i);
			if (child.getNodeType() == Node.TEXT_NODE)
			{
				textValue += child.getNodeValue();
			}
			else
			{
				throw new XMPException("Invalid child of literal property element", BADRDF);
			}
		}
		newChild.setValue(textValue);
	}
	
	
	/**
	 * 7.2.17 parseTypeLiteralPropertyElt
	 *		start-element ( URI == propertyElementURIs,
	 *			attributes == set ( idAttr?, parseLiteral ) )
	 *		literal
	 *		end-element()
	 * 
	 * @throws XMPException thown on parsing errors
	 */
	private static void rdf_ParseTypeLiteralPropertyElement() throws XMPException
	{
		throw new XMPException("ParseTypeLiteral property element not allowed", BADXMP);
	}

	
	/**
	 * 7.2.18 parseTypeResourcePropertyElt
	 *		start-element ( URI == propertyElementURIs, 
	 *			attributes == set ( idAttr?, parseResource ) )
	 *		propertyEltList
	 *		end-element()
	 *
	 * Add a new struct node with a qualifier for the possible rdf:ID attribute. 
	 * Then process the XML child nodes to get the struct fields.
	 * 
	 * @param xmp the xmp metadata object that is generated
	 * @param xmpParent the parent xmp node
	 * @param xmlNode the currently processed XML node
	 * @param isTopLevel Flag if the node is a top-level node
	 * @throws XMPException thown on parsing errors
	 */
	private static void rdf_ParseTypeResourcePropertyElement(XMPMetaImpl xmp, XMPNode xmpParent,
			Node xmlNode, boolean isTopLevel) throws XMPException
	{
		XMPNode newStruct = addChildNode (xmp, xmpParent, xmlNode, "", isTopLevel);
		
		newStruct.getOptions().setStruct(true);

		for (int i = 0; i < xmlNode.getAttributes().getLength(); i++)
		{
			Node attribute = xmlNode.getAttributes().item(i);
			if ("xmlns".equals(attribute.getPrefix())  ||
					(attribute.getPrefix() == null  &&  "xmlns".equals(attribute.getNodeName())))
			{
				continue;
			}
			
			String attrLocal = attribute.getLocalName();
			String attrNS = attribute.getNamespaceURI();
			if (XML_LANG.equals(attribute.getNodeName()))
			{
				addQualifierNode (newStruct, XML_LANG, attribute.getNodeValue());
			}
			else if (NS_RDF.equals(attrNS)  &&
					 ("ID".equals(attrLocal)  ||  "parseType".equals(attrLocal)))
			{
				continue;	// The caller ensured the value is "Resource".
							// Ignore all rdf:ID attributes.
			} 
			else
			{
				throw new XMPException("Invalid attribute for ParseTypeResource property element",
						BADRDF);
			}
		}

		rdf_PropertyElementList (xmp, newStruct, xmlNode, false);

		if (newStruct.getHasValueChild())
		{
			fixupQualifiedNode (newStruct);
		}
	}

	
	/**
	 * 7.2.19 parseTypeCollectionPropertyElt
	 *		start-element ( URI == propertyElementURIs, 
	 *			attributes == set ( idAttr?, parseCollection ) )
	 *		nodeElementList
	 *		end-element()
	 *
	 * @throws XMPException thown on parsing errors
	 */
	private static void rdf_ParseTypeCollectionPropertyElement() throws XMPException
	{
		throw new XMPException("ParseTypeCollection property element not allowed", BADXMP);
	}


	/**
	 * 7.2.20 parseTypeOtherPropertyElt
	 *		start-element ( URI == propertyElementURIs, attributes == set ( idAttr?, parseOther ) )
	 *		propertyEltList
	 *		end-element()
	 * 
	 * @throws XMPException thown on parsing errors
	 */
	private static void rdf_ParseTypeOtherPropertyElement() throws XMPException
	{
		throw new XMPException("ParseTypeOther property element not allowed", BADXMP);
	}


	/**
	 * 7.2.21 emptyPropertyElt
	 *		start-element ( URI == propertyElementURIs,
	 *						attributes == set (
	 *							idAttr?, ( resourceAttr | nodeIdAttr )?, propertyAttr* ) )
	 *		end-element()
	 *
	 *	<ns:Prop1/>  <!-- a simple property with an empty value --> 
	 *	<ns:Prop2 rdf:resource="http: *www.adobe.com/"/> <!-- a URI value --> 
	 *	<ns:Prop3 rdf:value="..." ns:Qual="..."/> <!-- a simple qualified property --> 
	 *	<ns:Prop4 ns:Field1="..." ns:Field2="..."/> <!-- a struct with simple fields -->
	 *
	 * An emptyPropertyElt is an element with no contained content, just a possibly empty set of
	 * attributes. An emptyPropertyElt can represent three special cases of simple XMP properties: a
	 * simple property with an empty value (ns:Prop1), a simple property whose value is a URI
	 * (ns:Prop2), or a simple property with simple qualifiers (ns:Prop3). 
	 * An emptyPropertyElt can also represent an XMP struct whose fields are all simple and 
	 * unqualified (ns:Prop4).
	 *
	 * It is an error to use both rdf:value and rdf:resource - that can lead to invalid  RDF in the
	 * verbose form written using a literalPropertyElt.
	 *
	 * The XMP mapping for an emptyPropertyElt is a bit different from generic RDF, partly for 
	 * design reasons and partly for historical reasons. The XMP mapping rules are:
	 * <ol> 
	 *		<li> If there is an rdf:value attribute then this is a simple property
	 *				 with a text value.
	 *		All other attributes are qualifiers.
	 *		<li> If there is an rdf:resource attribute then this is a simple property 
	 *			with a URI value. 
	 *		All other attributes are qualifiers.
	 *		<li> If there are no attributes other than xml:lang, rdf:ID, or rdf:nodeID
	 *				then this is a simple 
	 *		property with an empty value. 
	 *		<li> Otherwise this is a struct, the attributes other than xml:lang, rdf:ID, 
	 *				or rdf:nodeID are fields. 
	 * </ol>
	 * 
	 * @param xmp the xmp metadata object that is generated
	 * @param xmpParent the parent xmp node
	 * @param xmlNode the currently processed XML node
	 * @param isTopLevel Flag if the node is a top-level node
	 * @throws XMPException thown on parsing errors
	 */
	private static void rdf_EmptyPropertyElement(XMPMetaImpl xmp, XMPNode xmpParent, Node xmlNode,
			boolean isTopLevel) throws XMPException
	{
		boolean hasPropertyAttrs = false;
		boolean hasResourceAttr = false;
		boolean hasNodeIDAttr = false;
		boolean hasValueAttr = false;
		
		Node valueNode = null;	// ! Can come from rdf:value or rdf:resource.
		
		if (xmlNode.hasChildNodes())
		{
			throw new XMPException(
					"Nested content not allowed with rdf:resource or property attributes",
					BADRDF);
		}
		
		// First figure out what XMP this maps to and remember the XML node for a simple value.
		for (int i = 0; i < xmlNode.getAttributes().getLength(); i++)
		{
			Node attribute = xmlNode.getAttributes().item(i);
			if ("xmlns".equals(attribute.getPrefix())  ||
					(attribute.getPrefix() == null  &&  "xmlns".equals(attribute.getNodeName())))
			{
				continue;
			}
			
			int attrTerm = getRDFTermKind (attribute);

			switch (attrTerm)
			{
				case RDFTERM_ID :
					// Nothing to do.
					break;

				case RDFTERM_RESOURCE :
					if (hasNodeIDAttr)
					{
						throw new XMPException(
							"Empty property element can't have both rdf:resource and rdf:nodeID",
							BADRDF);
					}
					else if (hasValueAttr)
					{
						throw new XMPException(
								"Empty property element can't have both rdf:value and rdf:resource",
								BADXMP);
					}

					hasResourceAttr = true;
					if (!hasValueAttr) 
					{
						valueNode = attribute;
					}	
					break;

				case RDFTERM_NODE_ID:
				if (hasResourceAttr)
				{
					throw new XMPException(
							"Empty property element can't have both rdf:resource and rdf:nodeID",
							BADRDF);
				}
				hasNodeIDAttr = true;
				break;

			case RDFTERM_OTHER:
				if ("value".equals(attribute.getLocalName())
						&& NS_RDF.equals(attribute.getNamespaceURI()))
				{
					if (hasResourceAttr)
					{
						throw new XMPException(
								"Empty property element can't have both rdf:value and rdf:resource",
								BADXMP);
					}
					hasValueAttr = true;
					valueNode = attribute;
				}
				else if (!XML_LANG.equals(attribute.getNodeName()))
				{
					hasPropertyAttrs = true;
				}
				break;

			default:
				throw new XMPException("Unrecognized attribute of empty property element",