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Java & XML, 2nd Edition getContent( ), and the results in the List evaluated through instanceof against a String, Element, or Comment. The addXXX( ) methods are designed to be chained together, and therefore return the modified Element: Element element = new Element(”root”); element.addChild(new Element(”child”) .addChild(new Element(”grandchild”) .addAttribute(”name”, “value”) .setContent(”Hello World!”)) .addChild(new Element(”anotherChild”)) ); This would result in the following XML document fragment: Hello World! Here’s the API listing: public class Element { public Element(String name); public Element(String name, String uri); public Element(String name, String prefix, String uri); public Element(String name, Namespace ns); public Document getDocument( ); public Element getParent( ); public Element detach( ); public String getName( ); public void setName(String name); public Namespace getNamespace( ); public Namespace getNamespace(String prefix); public void setNamespace(Namespace ns); public String getNamespacePrefix( ); public String getNamespaceURI( ); public String getQualifiedName( ); public void addNamespaceDeclaration(Namespace additionalNS); public void removeNamespaceDeclaration(Namespace additionalNS); public List getAdditionalNamespaces( ); public List getContent( ); public Element setMixedContent(List mixedContent); public Element addContent(CDATA cdata); public Element addContent(Comment comment); public Element addContent(Element element); public Element addContent(EntityRef entityRef); public Element addContent(ProcessingInstruction pi); public Element addContent(String text); public boolean removeContent(CDATA cdata); public boolean removeContent(Comment comment);
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Java & XML, 2nd Edition public class DocType { public DocType(String elementName, String publicID, String systemID); public DocType(String elementName, String systemID); public DocType(String elementName); public Document getDocument( ); public String getElementName( ); public String getPublicID( ); public DocType setPublicID(String publicID); public String getSystemID( ); public DocType setSystemID(String systemID); public Object clone( ); public boolean equals(Object obj); public int hashCode( ); public String toString( ); } A.4.1.5 Document Document models an XML document in Java. Document requires that it be created with a root Element, although that Element can be replaced with setRootElement( ). The getContent( ) method returns all the content of the Document, which includes the root Element and any Comments that may exist at the document level in the XML document. public class Document { public Document(Element rootElement, DocType docType); public Document(Element rootElement); public Document(List content); public Document(List content, DocType docType); public Document addContent(Comment comment); public Document removeContent(Comment comment); public Document addContent(ProcessingInstruction pi); public Document removeContent(ProcessingInstruction pi); public Element getRootElement( ) throws NoSuchElementException; public Document setRootElement(Element rootElement); public DocType getDocType( ); public Document setDocType(DocType docType); public List getContent( ); public void setMixedContent(List content); public Object clone( ); public boolean equals(Object obj); public int hashCode( ); public String toString( ); } A.4.1.6 Element Element is a Java representation of an XML element. It is completely namespace-aware, so all methods take in a single element name as an argument, as well as optional namespace information. The result of calls to getText( ) is always a String, either the textual content of the XML element or an empty String. An Element is considered to have mixed content when it has a combination of textual data and nested elements, as well as optional comments, entities, and processing instructions. This complete List of content can be obtained with
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Java & XML, 2nd Edition public String getValue( ); public void setValue(String value); public Object clone( ); public boolean equals(Object obj); public int hashCode( ); public String toString( ); // Convenience Methods for Data Conversion public String get StringValue(String default Value); public int getIntValue( ) throws DataConversionException; public long getLongValue( ) throws DataConversionException; public float getFloatValue( ) throws DataConversionException; public double getDoubleValue( ) throws DataConversionException; public boolean getBooleanValue( ) throws DataConversionException; } A.4.1.2 CDATA The CDATA class defines behavior for XML CDATA sections. public class CDATA { public CDATA(String text); public String getText( ); public Object clone( ); public boolean equals(Object obj); public int hashCode( ); public String toString( ); } A.4.1.3 Comment Comment is a simple representation of an XML comment, and contains the text within the XML comment. public class Comment { public Comment(String text); public Document getDocument( ); public Element getParent( ); public String getText( ); public void setText(String text); public Object clone( ); public boolean equals(Object obj); public int hashCode( ); public String toString( ); } A.4.1.4 DocType DocType represents a DOCTYPE declaration within an XML document. It includes information about the element name being constrained, as well as the public ID and system ID of the external DTD reference, if one is present.
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Java & XML, 2nd Edition A.3.4 Package: javax.xml.transform.sax This package provides two classes: SAXResult and SAXSource. These are implementations of the Result and Source interfaces, and are used when SAX events should be the input and output of a transformation. Because these are simple implementation classes, their methods are not detailed here; however, their usage is covered in detail in Chapter 9. A.3.5 Package: javax.xml.transform.stream This package provides two classes: StreamResult and StreamSource. These are implementations of the Result and Source interfaces, and are used when I/O streams should be the input and output of a transformation. Because these are simple implementation classes, their methods are not detailed here; however, their usage is covered in detail in Chapter 9. A.4 JDOM 1.0 (Beta 7) JDOM 1.0 (beta 7), detailed in Chapter 7 and Chapter 8, provides a complete view of an XML document within a tree model. Although this model is similar to DOM, it is not as rigid a representation; this allows the content of an Element, for example, to be set directly, instead of setting the value of the child of that Element. Additionally, JDOM provides concrete classes rather than interfaces, allowing instantiation of objects directly rather than through the use of a factory. SAX and DOM are only used in JDOM for the construction of a JDOM Document object from existing XML data, and are detailed in the org.jdom.input package. A.4.1 Package: org.jdom This package contains the core classes for JDOM 1.0C. These consist of XML objects modeled in Java and a set of Exceptions that can be thrown when errors occur.D A.4.1.1 Attribute Attribute defines behavior for an XML attribute, modeled in Java. Methods allow the user to obtain the value of the attribute as well as namespace information about the attribute. An instance can be created with the name of the attribute and its value, or the Namespace and local name, as well as the value, of the attribute. Several convenience methods are also provided for automatic data conversion of the attribute’s value. public class Attribute { public Attribute(String name, String value); public Attribute(String name, String value, Namespace ns); public Element getParent( ); public String getName( ); public Namespace getNamespace( ); public void setNamespace(Namespace ns); public String getQualifiedName( ); public String getNamespacePrefix( ); public String getNamespaceURI( ); Please note that while the JDOM API is fairly stable, it is still in beta. Minor changes may occur after the publication of this book. Please consult http://www.jdom.org/ for the latest JDOM classes. D To avoid complete boredom in this section, I’ve left out all the JDOM exceptions aside from the core one, JDOMException. I’d rather focus on the classes rather than the odd exceptional condition.
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Java & XML, 2nd Edition public class Transformer { public void setErrorListener(ErrorListener errorListener); public ErrorListener getErrorListener( ); public void setURIResolver(URIResolver resolver); public URIResolver getURIResolver( ); public void setOutputProperties(Properties properties); public Properties getOutputProperties( ); public void setOutputProperty(String name, String value); public String getOutputProperty(String name); public void clearParmaters( ); public void setParameter(String name, String value); public Object getParameter(String name); public void transform(Source xmlSource, Result outputTarget); } A.3.2.8 TransformerFactory This is the other “half” of the transformation engine in JAXP. You can specify the stylesheet to use for transformation, and then obtain new instances of a Transformer instance. You can also use this to generate a new Templates object for multiple transformations using the same stylesheet. public class TransformerFactory { public TransformerFactory newInstance( ); public Transformer newTemplates(Source stylesheet); public Transformer newTransformer(Source stylesheet); public Transformer newTransformer( ); public Source getAssociatedStylesheet(Source source, String media, String title, String charset); public ErrorListener getErrorListener( ); public void setErrorListener(ErrorListener errorListener); public URIResolver getURIResolver( ); public void setURIResolver(URIResolver uriResolver); public Object getAttribute(String name); public void setAttribute(String name, String value); public boolean getFeature(String name); } A.3.2.9 URIResolver This is the interface responsible for URI resolution, and is analogous to the SAX EntityResolver interface. public interface URIResolver { public Source resolve(String href, String base); } A.3.3 Package: javax.xml.transform.dom This package provides two classes: DOMResult and DOMSource . These are implementations of the Result and Source interfaces, and are used when DOM trees should be the input and output of a transformation. Because these are simple implementation classes, their methods are not detailed here; however, their usage is covered in detail in Chapter 9.
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Java & XML, 2nd Edition A.3.2.3 Result This interface provides for output of XML transformations. Default implementations of this interface are provided in the JAXP javax.xml.transform.* packages. public interface Result { public static final String PI_DISABLE_OUTPUT_ESCAPING; public static final String PI_ENABLE_OUTPUT_ESCAPING; public String getSystemId( ); public void setSystemId( ); } A.3.2.4 Source This interface provides for input of XML transformations. Default implementations of this interface are provided in the JAXP javax.xml.transform.* packages. public interface Source { public String getSystemId( ); public void setSystemId( ); } A.3.2.5 SourceLocator This interface is analogous to the SAX Locator interface, and details location information about an input to TrAX. Like ErrorListener, it’s most useful in error handling and reporting. public interface SourceLocator { public int getColumnNumber( ); public int getLineNumber( ); public String getPublicId( ); public String getSystemId( ); } A.3.2.6 Templates This interface is provided to perform a means of optimal transformations using the same stylesheet. Its only methods allow for generation of Transformer instances, and viewing its current set of output properties. public interface Tempaltes { public Properties getOutputProperties( ); public Transformer newTransformer( ); } A.3.2.7 Transformer This is the core (abstract) class for providing XML transformation facilities through TrAX and JAXP. In addition to setting the various properties and objects on the interface, you can perform the actual transformation with the transform( ) method.
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Java & XML, 2nd Edition public Object getProperty(String name); public void setProperty(String name, Object value); public boolean isNamespaceAware( ); public boolean isValidating( ); } A.3.1.6 SAXParserFactory This class is the factory used to create instances of the SAXParser class, and allows namespace and validation features to be set for the production of those instances. public abstract class SAXParserFactory { public static SAXParserFactory newInstance( ); public SAXParser newSAXParser( ) throws ParserConfigurationException, SAXException; public void setNamespaceAware(boolean aware); public void setValidating(boolean validating); public void setFeature(String name, boolean value); public boolean isNamespaceAware( ); public boolean isValidating( ); public boolean getFeature(String name); } A.3.2 Package: javax.xml.transform This is the package used in JAXP for transforming XML documents. It allows these transformations to be pluggable and vendor-neutral, provided they use the TrAX (Transformations API for XML) interfaces defined here. A.3.2.1 ErrorListener This interface is analogous to ErrorHandler in SAX, and provides error notification for transformations. Implement it in your own applications using TrAX. public interface ErrorListener { public void warning(TransformerException exception); public void error(TransformerException exception); public void fatalError(TransformerException exception); } A.3.2.2 OutputKeys This class is just a holder for several static constants used in the rest of the TrAX API. public class OutputKeys { public static final String CDATA_SECTION_ELEMENTS; public static final String DOCTYPE_PUBLIC; public static final String DOCTYPE_SYSTEM; public static final String ENCODING; public static final String INDENT; public static final String MEDIA_TYPE; public static final String METHOD; public static final String OMIT_XML_DECLARATION; public static final String STANDALONE; public static final String VERSION; }
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Java & XML, 2nd Edition A.3.1.3 FactoryConfigurationError This defines an Error that is thrown if a factory instance cannot be created. public class FactoryConfigurationException extends Error { public FactoryConfigurationError( ); public FactoryConfigurationError(String msg); public FactoryConfigurationError(Exception e); public FactoryConfigurationError(Exception e, String msg); } A.3.1.4 ParserConfigurationException This defines an Exception that is thrown if a parser is requested but cannot be constructed with the specified validation and namespace-awareness settings. public class ParserConfigurationException extends Exception { public ParserConfigurationException( ); public ParserConfigurationException(String msg); } A.3.1.5 SAXParser This class is the wrapper over an underlying SAX 1.0/2.0 parser implementation class, and allows parsing to occur in a vendor-neutral way. It essentially has a pair of each method: one for SAX 1.0, and one for SAX 2.0. public abstract class SAXParser { public void parse(InputStream stream, HandlerBase base) throws SAXException, IOException, IllegalArgumentException; public void parse(InputStream stream, HandlerBase base, String systemID) throws SAXException, IOException, IllegalArgumentException; public void parse(String uri, HandlerBase base) throws SAXException, IOException, IllegalArgumentException; public void parse(File file, HandlerBase base) throws SAXException, IOException, IllegalArgumentException; public void parse(InputSource source, HandlerBase base) throws SAXException, IOException, IllegalArgumentException; public void parse(InputStream stream, DefaultHandler dh) throws SAXException, IOException, IllegalArgumentException; public void parse(InputStream stream, DefaultHandler dh, String systemID) throws SAXException, IOException, IllegalArgumentException; public void parse(String uri, DefaultHandler dh) throws SAXException, IOException, IllegalArgumentException; public void parse(File file, DefaultHandler dh) throws SAXException, IOException, IllegalArgumentException; public void parse(InputSource source, DefaultHandler dh) throws SAXException, IOException, IllegalArgumentException; public Parser getParser( ) throws SAXException; public XMLReader getXMLReader( ) throws SAXException;
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Java & XML, 2nd Edition A.3.1 Package: javax.xml.parsers This is the single package used in JAXP, and details the classes needed for the JAXP abstraction and pluggability layer over XML parsing. A.3.1.1 DocumentBuilder This class is the wrapper over an underlying parser implementation class. It allows parsing to occur in a vendor-neutral way. public abstract class DocumentBuilder { public Document parse(InputStream stream) throws SAXException, IOException, IllegalArgumentException; public Document parse(InputStream stream, String systemID) throws SAXException, IOException, IllegalArgumentException; public Document parse(String uri) throws SAXException, IOException, IllegalArgumentException; public Document parse(File file) throws SAXException, IOException, IllegalArgumentException; public abstract Document parse(InputSource source) throws SAXException, IOException, IllegalArgumentException; public abstract Document newDocument( ); public abstract boolean isNamespaceAware( ); public abstract boolean isValidating( ); public abstract void setEntityResolver(EntityResolver er); public abstract void setErrorHandler(ErrorHandler eh); public DOMmplementation getDOMImplementation( ); } A.3.1.2 DocumentBuilderFactory This class is the factory used to create instances of the DocumentBuilder class, and allows namespace and validation features to be set for the production of those instances. public abstract class DocumentBuilderFactory { public static DocumentBuilderFactory newInstance( ); public abstract DocumentBuilder newDocumentBuilder( ) throws ParserConfigurationException; public void setAttribute(String name, Object value); public void setCoalescing(boolean coalescing); public void setExpandEntityReferences(boolean expand); public void setIgnoringComments(boolean ignoreComments); public void setIgnoringElementContentWhitespace(boolean ignoreWhitespace); public void setNamespaceAware(boolean aware); public void setValidating(boolean validating); public boolean isCoalescing( ); public boolean isExapandEntityReferences( ); public boolean isIgnoringComments( ); public boolean isIgnoreingElementContentWhitespace( ); public boolean isNamespaceAware( ); public boolean isValidating( ); public Object getAttribute(String name); }
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Java & XML, 2nd Edition A.2.1.15 NodeList This interface is a DOM structure analogous to a Java Vector or List. It is the return value of any method that supports multiple Node implementations as a result. This allows iteration through the items as well as providing the ability to get a Node at a specific index. public interface NodeList { public Node item(int index); public int getLength( ); } A.2.1.16 Notation This interface represents a NOTATION construct in a DTD, used to declare the format of an unparsed entity or for declaration of PIs. This provides access to both the system ID and public ID within the declaration. Both return null if they are not present. public interface Notation extends Node { public String getPublicId( ); public String getSystemId( ); } A.2.1.17 ProcessingInstruction This interface represents an XML processing instruction (PI). It provides methods for getting the target and the data of the PI. Note that there is no means of accessing the “name/value” pairs within the PI individually. The data can also be set for the PI. public interface ProcessingInstruction extends Node { public String getTarget( ); public String getData( ); public void setData(String data) throws DOMException; } A.2.1.18 Text This interface provides a Java representation of an XML element’s textual data. The only method it adds to those defined in CharacterData is one that will split the node into two nodes. The original Text node contains text up to the specified offset, and the method returns a new Text node with the text after the offset. Like other mutability methods, a DOMException is thrown when the node is read-only. public interface Text extends CharacterData { public Text splitText(int offset) throws DOMException; } A.3 JAXP 1.1 JAXP provides an abstraction layer over the process of getting a vendor’s implementation of a SAX or DOM parser, as well as providing transformations in a vendor-neutral way.
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