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Java & XML, 2nd Edition A.2.1.14 Node This is the central interface for all DOM objects. It provides a robust set of methods for accessing information about a Node in the DOM tree. It also allows for handling of a Node’s children (if they exist). While most of the methods are self-explanatory, there are several methods worth noting: getAttributes( ) only returns non-null data if the Node is an Element; cloneNode( ) provides for a shallow or deep copy of a Node; normalize( ) moves all text into non-adjacent Text nodes (no two Text nodes are adjacent, and all resolved textual entity references are consolidated into Text nodes); and isSupported( ) provides information about the feature set of the Node. Namespace-aware methods are also provided (getNamespaceURI( ), getPrefix( ), and getLocalName( )). Finally, a set of constants is provided for identifying the type of a Node by comparing the constants against the result of getNodeType( ). public interface Node { public String getNodeName( ); public String getNodeValue( ) throws DOMException; public void setNodeValue(String nodeValue) throws DOMException; public short getNodeType( ); public Node getParentNode( ); public NodeList getChildNodes( ); public Node getFirstChild( ); public Node getLastChild( ); public Node getPreviousSibling( ); public Node getNextSibling( ); public NamedNodeMap getAttributes( ); public Document getOwnerDocument( ); public Node insertBefore(Node newChild, Node refChild) throws DOMException; public Node replaceChild(Node newChild, Node oldChild) throws DOMException; public Node removeChild(Node oldChild) throws DOMException; public Node appendChild(Node newChild) throws DOMException; public boolean hasChildNodes( ); public Node cloneNode(boolean deep); public void normalize( ); public boolean isSupported(String feature, String version); public String getNamespaceURI( ); public String getPrefix( ); public void setPrefix(String prefix) throws DOMException; public String getLocalName( ); public boolean hasAttributes( ); // Node Type Constants public static final short ELEMENT_NODE; public static final short ATTRIBUTE_NODE; public static final short TEXT_NODE; public static final short CDATA_SECTION_NODE; public static final short ENTITY_REFERENCE_NODE; public static final short ENTITY_NODE; public static final short PROCESSING_INSTRUCTION_NODE; public static final short COMMENT_NODE; public static final short DOCUMENT_NODE; public static final short DOCUMENT_TYPE_NODE; public static final short DOCUMENT_FRAGMENT_NODE; public static final short NOTATION_NODE; }
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Java & XML, 2nd Edition public Attr setAttributeNode(Attr newAttr) throws DOMException; public Attr removeAttributeNode(Attr oldAttr) throws DOMException; public NodeList getElementsByTagName(String name); public String getAttributeNS(String namespaceURI, String localName); public void setAttributeNS(String namespaceURI, String qualifiedName, String value) throws DOMException; public void removeAttributeNS(String namespaceURI, String localName) throws DOMException; public Attr getAttributeNodeNS(String namespaceURI, String localName); public Attr setAttributeNodeNS(Attr newAttr) throws DOMException; public NodeList getElementsByTagNameNS(String namespaceURI, String localName); public boolean hasAttribute(String name); public boolean hasAttributeNS(String namespaceURI, String localName); } A.2.1.11 Entity This provides a Java representation of an entity (parsed or unparsed) in an XML document. Access to the system ID and public ID as well as the notation for the entity (from the DTD) is provided through accessor methods. public interface Entity extends Node { public String getPublicId( ); public String getSystemId( ); public String getNotationName( ); } A.2.1.12 EntityReference This interface represents the resulting value from an entity reference once the entity has been resolved. This interface assumes that character and predefined entity references have already occurred when this interface is exposed to the application client. public interface EntityReference extends Node { } A.2.1.13 NamedNodeMap This interface defines a list, much like NodeList, but requires that each Node in the list be a named Node (such as an Element or Attr). Because of this requirement, methods can be provided to access members of the list by their names (with or without namespace support). The list also provides for removal and modification of its members. These methods all throw DOMExceptions when the referenced Node is read-only. public interface NamedNodeMap { public Node getNamedItem(String name); public Node setNamedItem(Node arg) throws DOMException; public Node removeNamedItem(String name) throws DOMException; public Node item(int index); public int getLength( ); public Node getNamedItemNS(String namespaceURI, String localName); public Node setNamedItemNS(Node arg) throws DOMException; public Node removeNamedItemNS(String namespaceURI, String localName) throws DOMException; }
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Java & XML, 2nd Edition public class DOMException extends RuntimeException { public DOMException(short code, String message); // Exception codes public static final short INDEX_SIZE_ERR; public static final short DOMSTRING_SIZE_ERR; public static final short HIERARCHY_REQUEST_ERR; public static final short WRONG_DOCUMENT_ERR; public static final short INVALID_CHARACTER_ERR; public static final short NO_DATA_ALLOWED_ERR; public static final short NO_MODIFICATION_ALLOWED_ERR; public static final short NOT_FOUND_ERR; public static final short NOT_SUPPORTED_ERR; public static final short INUSE_ATTRIBUTE_ERR; public static final short INVALID_STATE_ERR; public static final short SYNTAX_ERR; public static final short INVALID_MODIFICATION_ERR; public static final short NAMESPACE_ERR; public static final short INVALID_ACCESS_ERR; } A.2.1.9 DOMImplementation This interface attempts to provide a standard entry point for accessing vendor- specific DOM implementations, and allowing the creation of a DocumentType and Document within those vendor implementations.B It also provides a method (hasFeature( )) for querying the implementation for a specific feature support, like the DOM Level 2 Traversal or Range modules. public interface DOMImplementation { public boolean hasFeature(String feature, String version); public DocumentType createDocumentType(String qualifiedName, String publicId, String systemId) throws DOMException; public Document createDocument(String namespaceURI, String qualifiedName, DocumentType doctype) throws DOMException; } A.2.1.10 Element This interface provides a Java representation of an XML element. It provides methods to get its name and attributes, as well as to set these values. It also supplies several flavors of access to the XML attributes, including namespace-aware versions of the getXXX( ) and setXXX( ) methods. public interface Element extends Node { public String getTagName( ); public String getAttribute(String name); public void setAttribute(String name, String value) throws DOMException; public void removeAttribute(String name) throws DOMException; public Attr getAttributeNode(String name); B Unfortunately, to obtain an instance of a DOMImplementation, you must have a Document object and use getDOMImplementation( ), or directly load the vendor’s classes. This tends to result in a chicken-and-egg scenario; see Chapter 5 and Chapter 6 for more details.
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Java & XML, 2nd Edition public CDATASection createCDATASection(String data) throws DOMException; public ProcessingInstruction createProcessingInstruction(String target, String data) throws DOMException; public Attr createAttribute(String name) throws DOMException; public EntityReference createEntityReference(String name) throws DOMException; public NodeList getElementsByTagName(String tagname); public Node importNode(Node importedNode, boolean deep) throws DOMException; public Element createElementNS(String namespaceURI, String qualifiedName) throws DOMException; public Attr createAttributeNS(String namespaceURI, String qualifiedName) throws DOMException; public NodeList getElementsByTagNameNS(String namespaceURI, String localName); public Element getElementById(String elementId); } A.2.1.6 DocumentFragment This interface provides for dealing with only a portion of a complete Document object at one time. It is useful for manipulating portions of a DOM tree without having to store the entire tree in memory. public interface DocumentFragment extends Node { } A.2.1.7 DocumentType This interface represents an XML document’s DOCTYPE declaration. The name is the element name immediately following Searching for affordable and reliable webhost to host and run your web applications? Go to our java web server services and you will be pleased.

Java & XML, 2nd Edition public interface CDATASection extends Text { } A.2.1.3 CharacterData This interface is the “super” interface for all textual Node types in DOM (Text, Comment, and indirectly CDATASection). It defines methods for accessing and setting the data within a textual node, as well as a set of methods for dealing with the textual data directly as characters: obtaining the length, appending, inserting, and deleting data, and replacing all or part of the data. All of these methods throw DOMExceptions when the node is read-only. public interface CharacterData extends Node { public String getData( ) throws DOMException; public void setData(String data) throws DOMException; public int getLength( ); public String substringData(int offset, int count) throws DOMException; public void appendData(String arg) throws DOMException; public void insertData(int offset, String arg) throws DOMException; public void deleteData(int offset, int count) throws DOMException; public void replaceData(int offset, int count, String arg) throws DOMException; } A.2.1.4 Comment This interface provides a Java representation for an XML comment. Similar to CDATASection, it adds no methods of its own but does allow a distinction (based on the type of the interface) to distinguish between text and comments in an XML document. public interface Comment extends CharacterData { } A.2.1.5 Document This interface is the DOM representation of a complete XML document. It is also the key for creating new XML elements, attributes, PIs, and other constructs. In addition to allowing retrieval of the DTD declaration (getDocType( )) and root element (getDocumentElement( )), this allows searching through the tree in a pre-order fashion for a specific element (getElementsByTagName( )). Because the DOM model requires that all Node implementations be tied to a DOM Document object, this provides methods for creating the various types of DOM Nodes. Each createXXX( ) method has a complement that supports namespaces through createXXXNS( ). Additionally, Nodes can be imported into this Document through importNode( ); the boolean value indicates if the children of the imported Node should be recursively imported as well. public interface Document extends Node { public DocumentType getDoctype( ); public DOMImplementation getImplementation( ); public Element getDocumentElement( ); public Element createElement(String tagName) throws DOMException; public DocumentFragment createDocumentFragment( ); public Text createTextNode(String data); public Comment createComment(String data);
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Java & XML, 2nd Edition A.1.3.10 XMLReaderFactory This class contains methods that dynamically create an instance of an XMLReader implementation from a specified class name, or if none is supplied, from a system property named “org.xml.sax.driver”. final public class XMLReaderFactory { public static XMLReader createXMLReader( ) throws SAXException; public static XMLReader createXMLReader(String className) throws SAXException; } A.2 DOM Level 2 DOM provides a complete, in-memory representation of an XML document. Developed by the W3C, DOM provides detail about the structure of a document after it has been completely parsed. While DOM Level 3 will specify an API for getting the DOM Document object, there is currently nothing in DOM that defines this behavior. Like SAX, most of the core DOM package is made up of interfaces that define structures within an XML document, and map those structures to the Java language (these same mappings apply to CORBA, JavaScript, and other languages as well). A.2.1 Package: org.w3c.dom This package contains the core interfaces and classes for DOM Level 2. Typically a vendor’s parsing software provides an implementation of those interfaces that are implicitly used by your application software. A.2.1.1 Attr This interface represents an XML attribute (on an element) within Java. It provides access to the name and value of the attribute, and allows the setting of the value (for mutability).A The getSpecified( ) method indicates if the attribute (and its value) was explicitly noted in the XML document, or if a value was not specified but the document’s DTD assigned a default value to the attribute. Finally, the “owning” element can be obtained from this interface. public interface Attr extends Node { public String getName( ); public boolean getSpecified( ); public String getValue( ); public void setValue(String value) throws DOMException; public Element getOwnerElement( ); } A.2.1.2 CDATASection This interface does not define any methods of its own; instead it inherits all of the Text interface’s methods. However, by having its own interface (and thus its own node type), a distinction can be drawn between text within XML CDATA sections and simple text (not in a CDATA section) within an element. A In this and other setXXX( ) methods in DOM, a DOMException results when a modification is attempted on a node that is read-only.
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Java & XML, 2nd Edition A.1.3.7 ParserFactory This class contains methods that dynamically create an instance of a Parser implementation from a specified class name, or if none is supplied, from a system property named “org.xml.sax.driver”. public class ParserFactory { public static Parser makeParser( ) throws ClassNotFoundException, IllegalAccessException, InstantiationException, NullPointerException, ClassCastException; public static Parser makeParser(String className) throws ClassNotFoundException, IllegalAccessException, InstantiationException, ClassCastException; } A.1.3.8 XMLFilterImpl This class provides a default implementation of the org.xml.sax.XMLFilter interface. public class XMLFilterImpl implements XMLFilter, EntityResolver, DTDHandler, ContentHandler, ErrorHandler { public XMLFilterImpl( ); public XMLFilterImpl(XMLReader parent); // Implementation of XMLFilter interface // Implementation of XMLReader interface // Implementation of EntityResolver interface // Implementation of DTDHandler interface // Implementation of ContentHandler interface // Implementation of ErrorHandler interface} A.1.3.9 XMLReaderAdapter This helper class wraps a SAX 2.0 XMLReader implementation and makes it behave like a 1.0 Parser implementation (making namespace support unavailable). The namespaces feature (http://xml.org/sax/features/namespaces) must be supported, or errors in parsing will occur. public class XMLReaderAdapter implements Parser, ContentHandler { public XMLReaderAdapter ( ) throws SAXException; public XMLReaderAdapter (XMLReader xmlReader); // Implementation of Parser interface // Implementation of ContentHandler interface}
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Java & XML, 2nd Edition A.1.3.4 LocatorImpl This class provides a default implementation of the org.xml.sax.Locator interface. It also provides a means of directly setting the line and column numbers. public class LocatorImpl implements Locator { public LocatorImpl( ); public LocatorImpl(Locator locator); // Implementation of Locator interface // Additional methods public void setPublicId(String publicId); public void setSystemId(String systemId); public void setLineNumber(int lineNumber); public void setColumnNumber(int columnNumber); } A.1.3.5 NamespaceSupport This encapsulates namespace behavior, allowing applications to not have to implement the behavior on their own (unless desired for performance reasons). It allows handling of namespace contexts in a stack fashion, and also provides the ability to process XML 1.0 names, retrieving their “namespace-aware” counterparts. public class NamespaceSupport { public NamespaceSuport( ); public void reset( ); public void pushContext( ); public void popContext( ); public boolean declarePrefix(String prefix, String uri); public String [] processName(String qName, String parts[], boolean isAttribute); public String getURI(String prefix); public Enumeration getPrefixes( ); public Enumeration getDeclaredPrefixes( ); } A.1.3.6 ParserAdapter This helper class wraps a SAX 1.0 Parser implementation and makes it behave like a 2.0 XMLReader implementation (making namespace support available). The only callback that does not behave normally is skippedEntity( ) in the ContentHandler interface; it is never invoked. public class ParserAdapter implements XMLReader, DocumentHandler { public ParserAdapter( ) throws SAXException; public ParserAdapter(Parser parser); // Implementation of XMLReader interface // Implementation of DocumentHandler interface}
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Java & XML, 2nd Edition A.1.3.1 AttributeListImpl This class provides a default implementation of the org.xml.sax.AttributeList interface, and is deprecated in SAX 2.0. It allows addition and removal of attributes as well as a clearing of the list. public class AttributeListImpl implements AttributeList { public AttributeListImpl( ); public AttributeListImpl(AttributeList atts); // Implementation of AttributeList interface // Additional methods public void setAttributeList(AttributeList atts); public void addAttribute(String name, String type, String value); public void removeAttribute(String name); public void clear( ); } A.1.3.2 AttributesImpl This class provides a default implementation of the org.xml.sax.Attributes interface. It allows addition and removal of attributes as well as a clearing of the list. public class AttributesImpl implements Attributes { public AttributesImpl( ); public AttributesImpl(Attributes atts); // Implementation of Attributes interface // Additional methodspublic void addAttribute(String uri, String localName, String qName, String type, String value); public void setAttribute(int index, String uri, String localName, String qName, String type, String value); public void clear( ); } A.1.3.3 DefaultHandler This helper class provides empty implementations of all the SAX 2.0 core handler interfaces, and can be extended to allow for quick addition of handlers by only overriding methods with application-defined behavior. This replaces the SAX 1.0 org.xml.sax.HandlerBase class. public class DefaultHandler implements EntityResolver, DTDHandler, ContentHandler, ErrorHandler { // (Empty) Implementation of EntityResolver interface // (Empty) Implementation of DTDHandler interface // (Empty) Implementation of ContentHandler interface // (Empty) Implementation of ErrorHandler interface}
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Java & XML, 2nd Edition public interface DeclHandler { public abstract void elementDecl(String name, String model) throws SAXException; public abstract void attributeDecl(String eName, String aName, String type, String valueDefault, String value) throws SAXException; public abstract void internalEntityDecl(String name, String value) throws SAXException; public abstract void externalEntityDecl(String name, String publicId, String systemId) throws SAXException; } A.1.2.2 LexicalHandler This interface defines callbacks for various events that are at a document level in terms of processing, but do not affect the resulting data within the XML document. For example, the handling of a DTD declaration, comments, and entity references would invoke callbacks in implementations of this interface. Additionally, a callback is defined to signal when a CDATA section is started and ended (although the reported data will always remain the same). public interface LexicalHandler { public abstract void startDTD(String name, String publicId, String systemId) throws SAXException; public abstract void endDTD( ) throws SAXException; public abstract void startEntity(String name) throws SAXException; public abstract void endEntity(String name) throws SAXException; public abstract void startCDATA( ) throws SAXException; public abstract void endCDATA( ) throws SAXException; public abstract void comment(char ch[], int start, int length) throws SAXException; } A.1.3 Package: org.xml.sax.helpers This package provides extensions to the SAX core classes and interfaces. Specifically, additional handlers are defined for less common processing within the SAX parsing process. XMLReader implementations are not required to support these extension handlers. In the classes in this package that are default implementations of core org.xml.sax interfaces, I have left out the repeated methods for brevity. Instead, I’ve simply added a comment indicating what interface’s methods are implemented.
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