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Diffstat (limited to 'common/src/main/java/at/gv/egovernment/moa/util/DOMUtils.java')
| -rw-r--r-- | common/src/main/java/at/gv/egovernment/moa/util/DOMUtils.java | 971 |
1 files changed, 0 insertions, 971 deletions
diff --git a/common/src/main/java/at/gv/egovernment/moa/util/DOMUtils.java b/common/src/main/java/at/gv/egovernment/moa/util/DOMUtils.java deleted file mode 100644 index 5be0bb500..000000000 --- a/common/src/main/java/at/gv/egovernment/moa/util/DOMUtils.java +++ /dev/null @@ -1,971 +0,0 @@ -package at.gv.egovernment.moa.util; - -import java.io.ByteArrayInputStream; -import java.io.ByteArrayOutputStream; -import java.io.IOException; -import java.io.InputStream; -import java.util.HashMap; -import java.util.HashSet; -import java.util.Iterator; -import java.util.List; -import java.util.Map; -import java.util.Set; -import java.util.Vector; - -import javax.xml.parsers.DocumentBuilder; -import javax.xml.parsers.DocumentBuilderFactory; -import javax.xml.parsers.ParserConfigurationException; -import javax.xml.transform.OutputKeys; -import javax.xml.transform.Transformer; -import javax.xml.transform.TransformerException; -import javax.xml.transform.TransformerFactory; -import javax.xml.transform.dom.DOMSource; -import javax.xml.transform.stream.StreamResult; - -import org.w3c.dom.Attr; -import org.w3c.dom.Document; -import org.w3c.dom.DocumentFragment; -import org.w3c.dom.Element; -import org.w3c.dom.NamedNodeMap; -import org.w3c.dom.Node; -import org.w3c.dom.NodeList; - -import org.apache.xerces.parsers.DOMParser; -import org.apache.xerces.parsers.SAXParser; -import org.apache.xerces.parsers.XMLGrammarPreparser; -import org.apache.xerces.util.SymbolTable; -import org.apache.xerces.util.XMLGrammarPoolImpl; -import org.apache.xerces.xni.grammars.XMLGrammarDescription; -import org.apache.xerces.xni.grammars.XMLGrammarPool; -import org.apache.xerces.xni.parser.XMLInputSource; -import org.xml.sax.EntityResolver; -import org.xml.sax.ErrorHandler; -import org.xml.sax.InputSource; -import org.xml.sax.SAXException; - - -import at.gv.egovernment.moa.logging.Logger; - -/** - * Various utility functions for handling XML DOM trees. - * - * The parsing methods in this class make use of some features internal to the - * Xerces DOM parser, mainly for performance reasons. As soon as JAXP - * (currently at version 1.2) is better at schema handling, it should be used as - * the parser interface. - * - * @author Patrick Peck - * @version $Id$ - */ -public class DOMUtils { - - /** Feature URI for namespace aware parsing. */ - private static final String NAMESPACES_FEATURE = - "http://xml.org/sax/features/namespaces"; - /** Feature URI for validating parsing. */ - private static final String VALIDATION_FEATURE = - "http://xml.org/sax/features/validation"; - /** Feature URI for schema validating parsing. */ - private static final String SCHEMA_VALIDATION_FEATURE = - "http://apache.org/xml/features/validation/schema"; - /** Feature URI for normalization of element/attribute values. */ - private static final String NORMALIZED_VALUE_FEATURE = - "http://apache.org/xml/features/validation/schema/normalized-value"; - /** Feature URI for parsing ignorable whitespace. */ - private static final String INCLUDE_IGNORABLE_WHITESPACE_FEATURE = - "http://apache.org/xml/features/dom/include-ignorable-whitespace"; - /** Feature URI for creating EntityReference nodes in the DOM tree. */ - private static final String CREATE_ENTITY_REF_NODES_FEATURE = - "http://apache.org/xml/features/dom/create-entity-ref-nodes"; - /** Property URI for providing external schema locations. */ - private static final String EXTERNAL_SCHEMA_LOCATION_PROPERTY = - "http://apache.org/xml/properties/schema/external-schemaLocation"; - /** Property URI for providing the external schema location for elements - * without a namespace. */ - private static final String EXTERNAL_NO_NAMESPACE_SCHEMA_LOCATION_PROPERTY = - "http://apache.org/xml/properties/schema/external-noNamespaceSchemaLocation"; - /** Property URI for the Xerces grammar pool. */ - private static final String GRAMMAR_POOL = - org.apache.xerces.impl.Constants.XERCES_PROPERTY_PREFIX - + org.apache.xerces.impl.Constants.XMLGRAMMAR_POOL_PROPERTY; - /** A prime number for initializing the symbol table. */ - private static final int BIG_PRIME = 2039; - /** Symbol table for the grammar pool. */ - private static SymbolTable symbolTable = new SymbolTable(BIG_PRIME); - /** Xerces schema grammar pool. */ - private static XMLGrammarPool grammarPool = new XMLGrammarPoolImpl(); - /** Set holding the NamespaceURIs of the grammarPool, to prevent multiple - * entries of same grammars to the pool */ - private static Set grammarNamespaces; - - static { - grammarPool.lockPool(); - grammarNamespaces = new HashSet(); - } - - /** - * Preparse a schema and add it to the schema pool. - * The method only adds the schema to the pool if a schema having the same - * <code>systemId</code> (namespace URI) is not already present in the pool. - * - * @param inputStream An <code>InputStream</code> providing the contents of - * the schema. - * @param systemId The systemId (namespace URI) to use for the schema. - * @throws IOException An error occurred reading the schema. - */ - public static void addSchemaToPool(InputStream inputStream, String systemId) - throws IOException { - XMLGrammarPreparser preparser; - - if (!grammarNamespaces.contains(systemId)) { - - grammarNamespaces.add(systemId); - - // unlock the pool so that we can add another grammar - grammarPool.unlockPool(); - - // prepare the preparser - preparser = new XMLGrammarPreparser(symbolTable); - preparser.registerPreparser(XMLGrammarDescription.XML_SCHEMA, null); - preparser.setProperty(GRAMMAR_POOL, grammarPool); - preparser.setFeature(NAMESPACES_FEATURE, true); - preparser.setFeature(VALIDATION_FEATURE, true); - - // add the grammar to the pool - preparser.preparseGrammar( - XMLGrammarDescription.XML_SCHEMA, - new XMLInputSource(null, systemId, null, inputStream, null)); - - // lock the pool again so that schemas are not added automatically - grammarPool.lockPool(); - } - } - - /** - * Parse an XML document from an <code>InputStream</code>. - * - * @param inputStream The <code>InputStream</code> containing the XML - * document. - * @param validating If <code>true</code>, parse validating. - * @param externalSchemaLocations A <code>String</code> containing namespace - * URI to schema location pairs, the same way it is accepted by the <code>xsi: - * schemaLocation</code> attribute. - * @param externalNoNamespaceSchemaLocation The schema location of the - * schema for elements without a namespace, the same way it is accepted by the - * <code>xsi:noNamespaceSchemaLocation</code> attribute. - * @param entityResolver An <code>EntityResolver</code> to resolve external - * entities (schemas and DTDs). If <code>null</code>, it will not be set. - * @param errorHandler An <code>ErrorHandler</code> to decide what to do - * with parsing errors. If <code>null</code>, it will not be set. - * @return The parsed XML document as a DOM tree. - * @throws SAXException An error occurred parsing the document. - * @throws IOException An error occurred reading the document. - * @throws ParserConfigurationException An error occurred configuring the XML - * parser. - */ - public static Document parseDocument( - InputStream inputStream, - boolean validating, - String externalSchemaLocations, - String externalNoNamespaceSchemaLocation, - EntityResolver entityResolver, - ErrorHandler errorHandler) - throws SAXException, IOException, ParserConfigurationException { - - DOMParser parser; - - - - //if Debug is enabled make a copy of inputStream to enable debug output in case of SAXException - byte buffer [] = null; - ByteArrayInputStream baStream = null; - if(true == Logger.isDebugEnabled()) { - int len = inputStream.available(); - buffer = new byte[len]; - inputStream.read(buffer); - baStream = new ByteArrayInputStream(buffer); - } - - // create the DOM parser - if (symbolTable != null) { - parser = new DOMParser(symbolTable, grammarPool); - } else { - parser = new DOMParser(); - } - - // set parser features and properties - try { - parser.setFeature(NAMESPACES_FEATURE, true); - parser.setFeature(VALIDATION_FEATURE, validating); - parser.setFeature(SCHEMA_VALIDATION_FEATURE, validating); - parser.setFeature(NORMALIZED_VALUE_FEATURE, false); - parser.setFeature(INCLUDE_IGNORABLE_WHITESPACE_FEATURE, true); - parser.setFeature(CREATE_ENTITY_REF_NODES_FEATURE, false); - - if (validating) { - if (externalSchemaLocations != null) { - parser.setProperty( - EXTERNAL_SCHEMA_LOCATION_PROPERTY, - externalSchemaLocations); - } - if (externalNoNamespaceSchemaLocation != null) { - parser.setProperty( - EXTERNAL_NO_NAMESPACE_SCHEMA_LOCATION_PROPERTY, - externalNoNamespaceSchemaLocation); - } - } - - // set entity resolver and error handler - if (entityResolver != null) { - parser.setEntityResolver(entityResolver); - } - if (errorHandler != null) { - parser.setErrorHandler(errorHandler); - } - - // parse the document and return it - // if debug is enabled: use copy of strem (baStream) else use orig stream - if(null != baStream) - parser.parse(new InputSource(baStream)); - else - parser.parse(new InputSource(inputStream)); - } catch(SAXException e) { - if(true == Logger.isDebugEnabled() && null != buffer) { - String xmlContent = new String(buffer); - Logger.debug("SAXException in:\n" + xmlContent); - } - throw(e); - } - - return parser.getDocument(); - } - - /** - * Parse an XML document from an <code>InputStream</code>. - * - * It uses a <code>MOAEntityResolver</code> as the <code>EntityResolver</code> - * and a <code>MOAErrorHandler</code> as the <code>ErrorHandler</code>. - * - * @param inputStream The <code>InputStream</code> containing the XML - * document. - * @param validating If <code>true</code>, parse validating. - * @param externalSchemaLocations A <code>String</code> containing namespace - * URI to schema location pairs, the same way it is accepted by the <code>xsi: - * schemaLocation</code> attribute. - * @param externalNoNamespaceSchemaLocation The schema location of the - * schema for elements without a namespace, the same way it is accepted by the - * <code>xsi:noNamespaceSchemaLocation</code> attribute. - * @return The parsed XML document as a DOM tree. - * @throws SAXException An error occurred parsing the document. - * @throws IOException An error occurred reading the document. - * @throws ParserConfigurationException An error occurred configuring the XML - * parser. - */ - public static Document parseDocument( - InputStream inputStream, - boolean validating, - String externalSchemaLocations, - String externalNoNamespaceSchemaLocation) - throws SAXException, IOException, ParserConfigurationException { - - return parseDocument( - inputStream, - validating, - externalSchemaLocations, - externalNoNamespaceSchemaLocation, - new MOAEntityResolver(), - new MOAErrorHandler()); - } - - /** - * Parse an XML document from a <code>String</code>. - * - * It uses a <code>MOAEntityResolver</code> as the <code>EntityResolver</code> - * and a <code>MOAErrorHandler</code> as the <code>ErrorHandler</code>. - * - * @param xmlString The <code>String</code> containing the XML document. - * @param encoding The encoding of the XML document. - * @param validating If <code>true</code>, parse validating. - * @param externalSchemaLocations A <code>String</code> containing namespace - * URI to schema location pairs, the same way it is accepted by the <code>xsi: - * schemaLocation</code> attribute. - * @param externalNoNamespaceSchemaLocation The schema location of the - * schema for elements without a namespace, the same way it is accepted by the - * <code>xsi:noNamespaceSchemaLocation</code> attribute. - * @return The parsed XML document as a DOM tree. - * @throws SAXException An error occurred parsing the document. - * @throws IOException An error occurred reading the document. - * @throws ParserConfigurationException An error occurred configuring the XML - * parser. - */ - public static Document parseDocument( - String xmlString, - String encoding, - boolean validating, - String externalSchemaLocations, - String externalNoNamespaceSchemaLocation) - throws SAXException, IOException, ParserConfigurationException { - - InputStream in = new ByteArrayInputStream(xmlString.getBytes(encoding)); - return parseDocument( - in, - validating, - externalSchemaLocations, - externalNoNamespaceSchemaLocation); - } - - /** - * Parse an UTF-8 encoded XML document from a <code>String</code>. - * - * @param xmlString The <code>String</code> containing the XML document. - * @param validating If <code>true</code>, parse validating. - * @param externalSchemaLocations A <code>String</code> containing namespace - * URI to schema location pairs, the same way it is accepted by the <code>xsi: - * schemaLocation</code> attribute. - * @param externalNoNamespaceSchemaLocation The schema location of the - * schema for elements without a namespace, the same way it is accepted by the - * <code>xsi:noNamespaceSchemaLocation</code> attribute. - * @return The parsed XML document as a DOM tree. - * @throws SAXException An error occurred parsing the document. - * @throws IOException An error occurred reading the document. - * @throws ParserConfigurationException An error occurred configuring the XML - * parser. - */ - public static Document parseDocument( - String xmlString, - boolean validating, - String externalSchemaLocations, - String externalNoNamespaceSchemaLocation) - throws SAXException, IOException, ParserConfigurationException { - - return parseDocument( - xmlString, - "UTF-8", - validating, - externalSchemaLocations, - externalNoNamespaceSchemaLocation); - } - - /** - * A convenience method to parse an XML document validating. - * - * @param inputStream The <code>InputStream</code> containing the XML - * document. - * @return The root element of the parsed XML document. - * @throws SAXException An error occurred parsing the document. - * @throws IOException An error occurred reading the document. - * @throws ParserConfigurationException An error occurred configuring the XML - * parser. - */ - public static Element parseXmlValidating(InputStream inputStream) - throws ParserConfigurationException, SAXException, IOException { - return DOMUtils - .parseDocument(inputStream, true, Constants.ALL_SCHEMA_LOCATIONS, null) - .getDocumentElement(); - } - - /** - * Schema validate a given DOM element. - * - * @param element The element to validate. - * @param externalSchemaLocations A <code>String</code> containing namespace - * URI to schema location pairs, the same way it is accepted by the <code>xsi: - * schemaLocation</code> attribute. - * @param externalNoNamespaceSchemaLocation The schema location of the - * schema for elements without a namespace, the same way it is accepted by the - * <code>xsi:noNamespaceSchemaLocation</code> attribute. - * @return <code>true</code>, if the <code>element</code> validates against - * the schemas declared in it. - * @throws SAXException An error occurred parsing the document. - * @throws IOException An error occurred reading the document from its - * serialized representation. - * @throws ParserConfigurationException An error occurred configuring the XML - * @throws TransformerException An error occurred serializing the element. - */ - public static boolean validateElement( - Element element, - String externalSchemaLocations, - String externalNoNamespaceSchemaLocation) - throws - ParserConfigurationException, - IOException, - SAXException, - TransformerException { - - byte[] docBytes; - SAXParser parser; - - // create the SAX parser - if (symbolTable != null) { - parser = new SAXParser(symbolTable, grammarPool); - } else { - parser = new SAXParser(); - } - - // serialize the document - docBytes = serializeNode(element, "UTF-8"); - - // set up parser features and attributes - parser.setFeature(NAMESPACES_FEATURE, true); - parser.setFeature(VALIDATION_FEATURE, true); - parser.setFeature(SCHEMA_VALIDATION_FEATURE, true); - if (externalSchemaLocations != null) { - parser.setProperty( - EXTERNAL_SCHEMA_LOCATION_PROPERTY, - externalSchemaLocations); - } - if (externalNoNamespaceSchemaLocation != null) { - parser.setProperty( - EXTERNAL_NO_NAMESPACE_SCHEMA_LOCATION_PROPERTY, - "externalNoNamespaceSchemaLocation"); - } - - // set up entity resolver and error handler - parser.setEntityResolver(new MOAEntityResolver()); - parser.setErrorHandler(new MOAErrorHandler()); - - // parse validating - parser.parse(new InputSource(new ByteArrayInputStream(docBytes))); - return true; - } - - /** - * Serialize the given DOM node. - * - * The node will be serialized using the UTF-8 encoding. - * - * @param node The node to serialize. - * @return String The <code>String</code> representation of the given DOM - * node. - * @throws TransformerException An error occurred transforming the - * node to a <code>String</code>. - * @throws IOException An IO error occurred writing the node to a byte array. - */ - public static String serializeNode(Node node) - throws TransformerException, IOException { - return new String(serializeNode(node, "UTF-8", false), "UTF-8"); - } - - - /** - * Serialize the given DOM node. - * - * The node will be serialized using the UTF-8 encoding. - * - * @param node The node to serialize. - * @param omitXmlDeclaration The boolean value for omitting the XML Declaration. - * @return String The <code>String</code> representation of the given DOM - * node. - * @throws TransformerException An error occurred transforming the - * node to a <code>String</code>. - * @throws IOException An IO error occurred writing the node to a byte array. - */ - public static String serializeNode(Node node, boolean omitXmlDeclaration) - throws TransformerException, IOException { - return new String(serializeNode(node, "UTF-8", omitXmlDeclaration), "UTF-8"); - } - - /** - * Serialize the given DOM node. - * - * The node will be serialized using the UTF-8 encoding. - * - * @param node The node to serialize. - * @param omitXmlDeclaration The boolean value for omitting the XML Declaration. - * @param lineSeperator Sets the line seperator String of the parser - * @return String The <code>String</code> representation of the given DOM - * node. - * @throws TransformerException An error occurred transforming the - * node to a <code>String</code>. - * @throws IOException An IO error occurred writing the node to a byte array. - */ - public static String serializeNode(Node node, boolean omitXmlDeclaration, String lineSeperator) - throws TransformerException, IOException { - return new String(serializeNode(node, "UTF-8", omitXmlDeclaration, lineSeperator), "UTF-8"); - } - - /** - * Serialize the given DOM node to a byte array. - * - * @param node The node to serialize. - * @param xmlEncoding The XML encoding to use. - * @return The serialized node, as a byte array. Using a compatible encoding - * this can easily be converted into a <code>String</code>. - * @throws TransformerException An error occurred transforming the node to a - * byte array. - * @throws IOException An IO error occurred writing the node to a byte array. - */ - public static byte[] serializeNode(Node node, String xmlEncoding) - throws TransformerException, IOException { - return serializeNode(node, xmlEncoding, false); - } - - /** - * Serialize the given DOM node to a byte array. - * - * @param node The node to serialize. - * @param xmlEncoding The XML encoding to use. - * @param omitDeclaration The boolean value for omitting the XML Declaration. - * @return The serialized node, as a byte array. Using a compatible encoding - * this can easily be converted into a <code>String</code>. - * @throws TransformerException An error occurred transforming the node to a - * byte array. - * @throws IOException An IO error occurred writing the node to a byte array. - */ - public static byte[] serializeNode(Node node, String xmlEncoding, boolean omitDeclaration) - throws TransformerException, IOException { - return serializeNode(node, xmlEncoding, omitDeclaration, null); - } - - - /** - * Serialize the given DOM node to a byte array. - * - * @param node The node to serialize. - * @param xmlEncoding The XML encoding to use. - * @param omitDeclaration The boolean value for omitting the XML Declaration. - * @param lineSeperator Sets the line seperator String of the parser - * @return The serialized node, as a byte array. Using a compatible encoding - * this can easily be converted into a <code>String</code>. - * @throws TransformerException An error occurred transforming the node to a - * byte array. - * @throws IOException An IO error occurred writing the node to a byte array. - */ - public static byte[] serializeNode(Node node, String xmlEncoding, boolean omitDeclaration, String lineSeperator) - throws TransformerException, IOException { - - TransformerFactory transformerFactory = TransformerFactory.newInstance(); - Transformer transformer = transformerFactory.newTransformer(); - ByteArrayOutputStream bos = new ByteArrayOutputStream(16384); - - transformer.setOutputProperty(OutputKeys.METHOD, "xml"); - transformer.setOutputProperty(OutputKeys.ENCODING, xmlEncoding); - String omit = omitDeclaration ? "yes" : "no"; - transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, omit); - if (null!=lineSeperator) { - transformer.setOutputProperty("{http://xml.apache.org/xalan}line-separator", lineSeperator);//does not work for xalan <= 2.5.1 - } - transformer.transform(new DOMSource(node), new StreamResult(bos)); - - bos.flush(); - bos.close(); - - return bos.toByteArray(); - } - - /** - * Return the text that a node contains. - * - * This routine: - * <ul> - * <li>Ignores comments and processing instructions.</li> - * <li>Concatenates TEXT nodes, CDATA nodes, and the results recursively - * processing EntityRef nodes.</li> - * <li>Ignores any element nodes in the sublist. (Other possible options are - * to recurse into element sublists or throw an exception.)</li> - * </ul> - * - * @param node A DOM node from which to extract text. - * @return A String representing its contents. - */ - public static String getText(Node node) { - if (!node.hasChildNodes()) { - return ""; - } - - StringBuffer result = new StringBuffer(); - NodeList list = node.getChildNodes(); - - for (int i = 0; i < list.getLength(); i++) { - Node subnode = list.item(i); - if (subnode.getNodeType() == Node.TEXT_NODE) { - result.append(subnode.getNodeValue()); - } else if (subnode.getNodeType() == Node.CDATA_SECTION_NODE) { - result.append(subnode.getNodeValue()); - } else if (subnode.getNodeType() == Node.ENTITY_REFERENCE_NODE) { - // Recurse into the subtree for text - // (and ignore comments) - result.append(getText(subnode)); - } - } - return result.toString(); - } - - /** - * Build the namespace prefix to namespace URL mapping in effect for a given - * node. - * - * @param node The context node for which build the map. - * @return The namespace prefix to namespace URL mapping ( - * a <code>String</code> value to <code>String</code> value mapping). - */ - public static Map getNamespaceDeclarations(Node node) { - Map nsDecls = new HashMap(); - int i; - - do { - if (node.hasAttributes()) { - NamedNodeMap attrs = node.getAttributes(); - - for (i = 0; i < attrs.getLength(); i++) { - Attr attr = (Attr) attrs.item(i); - - // add prefix mapping if none exists - if ("xmlns".equals(attr.getPrefix()) - || "xmlns".equals(attr.getName())) { - - String nsPrefix = - attr.getPrefix() != null ? attr.getLocalName() : ""; - - if (nsDecls.get(nsPrefix) == null) { - nsDecls.put(nsPrefix, attr.getValue()); - } - } - } - } - } while ((node = node.getParentNode()) != null); - - return nsDecls; - } - - /** - * Add all namespace declarations declared in the parent(s) of a given - * element and used in the subtree of the given element to the given element. - * - * @param context The element to which to add the namespaces. - */ - public static void localizeNamespaceDeclarations(Element context) { - Node parent = context.getParentNode(); - - if (parent != null) { - Map namespaces = getNamespaceDeclarations(context.getParentNode()); - Set nsUris = collectNamespaceURIs(context); - Iterator iter; - - for (iter = namespaces.entrySet().iterator(); iter.hasNext();) { - Map.Entry e = (Map.Entry) iter.next(); - - if (nsUris.contains(e.getValue())) { - String prefix = (String) e.getKey(); - String nsUri = (String) e.getValue(); - String nsAttrName = "".equals(prefix) ? "xmlns" : "xmlns:" + prefix; - - context.setAttributeNS(Constants.XMLNS_NS_URI, nsAttrName, nsUri); - } - } - } - } - - /** - * Collect all the namespace URIs used in the subtree of a given element. - * - * @param context The element that should be searched for namespace URIs. - * @return All namespace URIs used in the subtree of <code>context</code>, - * including the ones used in <code>context</code> itself. - */ - public static Set collectNamespaceURIs(Element context) { - Set result = new HashSet(); - - collectNamespaceURIsImpl(context, result); - return result; - } - - /** - * A recursive method to do the work of <code>collectNamespaceURIs</code>. - * - * @param context The context element to evaluate. - * @param result The result, passed as a parameter to avoid unnecessary - * instantiations of <code>Set</code>. - */ - private static void collectNamespaceURIsImpl(Element context, Set result) { - NamedNodeMap attrs = context.getAttributes(); - NodeList childNodes = context.getChildNodes(); - String nsUri; - int i; - - // add the namespace of the context element - nsUri = context.getNamespaceURI(); - if (nsUri != null && nsUri != Constants.XMLNS_NS_URI) { - result.add(nsUri); - } - - // add all namespace URIs from attributes - for (i = 0; i < attrs.getLength(); i++) { - nsUri = attrs.item(i).getNamespaceURI(); - if (nsUri != null && nsUri != Constants.XMLNS_NS_URI) { - result.add(nsUri); - } - } - - // add all namespaces from subelements - for (i = 0; i < childNodes.getLength(); i++) { - Node node = childNodes.item(i); - - if (node.getNodeType() == Node.ELEMENT_NODE) { - collectNamespaceURIsImpl((Element) node, result); - } - } - } - - /** - * Check, that each attribute node in the given <code>NodeList</code> has its - * parent in the <code>NodeList</code> as well. - * - * @param nodes The <code>NodeList</code> to check. - * @return <code>true</code>, if each attribute node in <code>nodes</code> - * has its parent in <code>nodes</code> as well. - */ - public static boolean checkAttributeParentsInNodeList(NodeList nodes) { - Set nodeSet = new HashSet(); - int i; - - // put the nodes into the nodeSet - for (i = 0; i < nodes.getLength(); i++) { - nodeSet.add(nodes.item(i)); - } - - // check that each attribute node's parent is in the node list - for (i = 0; i < nodes.getLength(); i++) { - Node n = nodes.item(i); - - if (n.getNodeType() == Node.ATTRIBUTE_NODE) { - Attr attr = (Attr) n; - Element owner = attr.getOwnerElement(); - - if (owner == null) { - if (!isNamespaceDeclaration(attr)) { - return false; - } - } - - if (!nodeSet.contains(owner) && !isNamespaceDeclaration(attr)) { - return false; - } - } - } - - return true; - } - - /** - * Convert an unstructured <code>NodeList</code> into a - * <code>DocumentFragment</code>. - * - * @param nodeList Contains the node list to be converted into a DOM - * DocumentFragment. - * @return the resulting DocumentFragment. The DocumentFragment will be - * backed by a new DOM Document, i.e. all noded of the node list will be - * cloned. - * @throws ParserConfigurationException An error occurred creating the - * DocumentFragment. - * @precondition The nodes in the node list appear in document order - * @precondition for each Attr node in the node list, the owning Element is - * in the node list as well. - * @precondition each Element or Attr node in the node list is namespace - * aware. - */ - public static DocumentFragment nodeList2DocumentFragment(NodeList nodeList) - throws ParserConfigurationException { - - DocumentBuilder builder = - DocumentBuilderFactory.newInstance().newDocumentBuilder(); - Document doc = builder.newDocument(); - DocumentFragment result = doc.createDocumentFragment(); - - if (null == nodeList || nodeList.getLength() == 0) { - return result; - } - - int currPos = 0; - currPos = - nodeList2DocumentFragment(nodeList, currPos, result, null, null) + 1; - - while (currPos < nodeList.getLength()) { - currPos = - nodeList2DocumentFragment(nodeList, currPos, result, null, null) + 1; - } - return result; - } - - /** - * Helper method for the <code>nodeList2DocumentFragment</code>. - * - * @param nodeList The <code>NodeList</code> to convert. - * @param currPos The current position in the <code>nodeList</code>. - * @param result The resulting <code>DocumentFragment</code>. - * @param currOrgElem The current original element. - * @param currClonedElem The current cloned element. - * @return The current position. - */ - private static int nodeList2DocumentFragment( - NodeList nodeList, - int currPos, - DocumentFragment result, - Element currOrgElem, - Element currClonedElem) { - - while (currPos < nodeList.getLength()) { - Node currentNode = nodeList.item(currPos); - switch (currentNode.getNodeType()) { - case Node.COMMENT_NODE : - case Node.PROCESSING_INSTRUCTION_NODE : - case Node.TEXT_NODE : - { - // Append current node either to resulting DocumentFragment or to - // current cloned Element - if (null == currClonedElem) { - result.appendChild( - result.getOwnerDocument().importNode(currentNode, false)); - } else { - // Stop processing if current Node is not a descendant of - // current Element - if (!isAncestor(currOrgElem, currentNode)) { - return --currPos; - } - - currClonedElem.appendChild( - result.getOwnerDocument().importNode(currentNode, false)); - } - break; - } - - case Node.ELEMENT_NODE : - { - Element nextCurrOrgElem = (Element) currentNode; - Element nextCurrClonedElem = - result.getOwnerDocument().createElementNS( - nextCurrOrgElem.getNamespaceURI(), - nextCurrOrgElem.getNodeName()); - - // Append current Node either to resulting DocumentFragment or to - // current cloned Element - if (null == currClonedElem) { - result.appendChild(nextCurrClonedElem); - currOrgElem = nextCurrOrgElem; - currClonedElem = nextCurrClonedElem; - } else { - // Stop processing if current Node is not a descendant of - // current Element - if (!isAncestor(currOrgElem, currentNode)) { - return --currPos; - } - - currClonedElem.appendChild(nextCurrClonedElem); - } - - // Process current Node (of type Element) recursively - currPos = - nodeList2DocumentFragment( - nodeList, - ++currPos, - result, - nextCurrOrgElem, - nextCurrClonedElem); - - break; - } - - case Node.ATTRIBUTE_NODE : - { - Attr currAttr = (Attr) currentNode; - - // GK 20030411: Hack to overcome problems with IAIK IXSIL - if (currAttr.getOwnerElement() == null) - break; - if (currClonedElem == null) - break; - - // currClonedElem must be the owner Element of currAttr if - // preconditions are met - currClonedElem.setAttributeNS( - currAttr.getNamespaceURI(), - currAttr.getNodeName(), - currAttr.getValue()); - break; - } - - default : - { - // All other nodes will be ignored - } - } - - currPos++; - } - - return currPos; - } - - /** - * Check, if the given attribute is a namespace declaration. - * - * @param attr The attribute to check. - * @return <code>true</code>, if the attribute is a namespace declaration, - * <code>false</code> otherwise. - */ - private static boolean isNamespaceDeclaration(Attr attr) { - return Constants.XMLNS_NS_URI.equals(attr.getNamespaceURI()); - } - - /** - * Check, if a given DOM element is an ancestor of a given node. - * - * @param candAnc The DOM element to check for being the ancestor. - * @param cand The node to check for being the child. - * @return <code>true</code>, if <code>candAnc</code> is an (indirect) - * ancestor of <code>cand</code>; <code>false</code> otherwise. - */ - public static boolean isAncestor(Element candAnc, Node cand) { - Node currPar = cand.getParentNode(); - - while (currPar != null) { - if (candAnc == currPar) - return true; - currPar = currPar.getParentNode(); - } - return false; - } - - /** - * Selects the (first) element from a node list and returns it. - * - * @param nl The NodeList to get the element from. - * @return The (first) element included in the node list or <code>null</code> - * if the node list is <code>null</code> or empty or no element is - * included in the list. - */ - public static Element getElementFromNodeList (NodeList nl) { - if ((nl == null) || (nl.getLength() == 0)) { - return null; - } - for (int i=0; i<nl.getLength(); i++) { - Node node = nl.item(i); - if (node.getNodeType() == Node.ELEMENT_NODE) { - return (Element)node; - } - } - return null; - } - - /** - * Returns all child elements of the given element. - * - * @param parent The element to get the child elements from. - * - * @return A list including all child elements of the given element. - * Maybe empty if the parent element has no child elements. - */ - public static List getChildElements (Element parent) { - Vector v = new Vector(); - NodeList nl = parent.getChildNodes(); - int length = nl.getLength(); - for (int i=0; i < length; i++) { - Node node = nl.item(i); - if (node.getNodeType() == Node.ELEMENT_NODE) { - v.add((Element)node); - } - } - return v; - } - -} |