eu.cdevreeze.yaidom.parse

DocumentParserUsingDom

Related Docs: object DocumentParserUsingDom | package parse

final class DocumentParserUsingDom extends AbstractDocumentParser

DOM-based Document parser.

Typical non-trivial creation is as follows, assuming class MyEntityResolver, which extends EntityResolver, and class MyErrorHandler, which extends ErrorHandler:

val dbf = DocumentBuilderFactory.newInstance()
dbf.setNamespaceAware(true)

def createDocumentBuilder(dbf: DocumentBuilderFactory): DocumentBuilder = {
  val db = dbf.newDocumentBuilder()
  db.setEntityResolver(new MyEntityResolver)
  db.setErrorHandler(new MyErrorHandler)
  db
}

val docParser = DocumentParserUsingDom.newInstance(dbf, createDocumentBuilder _)

If we want the DocumentBuilderFactory to be a validating one, using an XML Schema, we could obtain the DocumentBuilderFactory as follows:

val schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI)
val schemaSource = new StreamSource(new File(pathToSchema))
val schema = schemaFactory.newSchema(schemaSource)

val dbf = {
  val result = DocumentBuilderFactory.newInstance()
  result.setNamespaceAware(true)
  result.setSchema(schema)
  result
}

A custom EntityResolver could be used to retrieve DTDs locally, or even to suppress DTD resolution. The latter can be coded as follows (see http://stuartsierra.com/2008/05/08/stop-your-java-sax-parser-from-downloading-dtds), risking some loss of information:

class MyEntityResolver extends EntityResolver {
  override def resolveEntity(publicId: String, systemId: String): InputSource = {
    // This dirty hack may not work on IBM JVMs
    new InputSource(new java.io.StringReader(""))
  }
}

For completeness, a custom ErrorHandler class that simply prints parse exceptions to standard output:

class MyErrorHandler extends ErrorHandler {
  def warning(exc: SAXParseException): Unit = { println(exc) }
  def error(exc: SAXParseException): Unit = { println(exc) }
  def fatalError(exc: SAXParseException): Unit = { println(exc) }
}

If more flexibility is needed in configuring the DocumentParser than offered by this class, consider writing a wrapper DocumentParser which wraps a DocumentParserUsingDom, but adapts the parse method. This would make it possible to adapt the conversion from a DOM Document to yaidom Document, for example.

A DocumentParserUsingDom instance can be re-used multiple times, from the same thread. If the DocumentBuilderFactory is thread-safe, it can even be re-used from multiple threads. Typically a DocumentBuilderFactory cannot be trusted to be thread-safe, however. In a web application, one (safe) way to deal with that is to use one DocumentBuilderFactory instance per request.

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AbstractDocumentParser, DocumentParser, AnyRef, Any
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Instance Constructors

  1. new DocumentParserUsingDom(docBuilderFactory: DocumentBuilderFactory, docBuilderCreator: (DocumentBuilderFactory) ⇒ DocumentBuilder)

Value Members

  1. final def !=(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any

  2. final def ##(): Int

    Definition Classes
    AnyRef → Any

  3. final def ==(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any

  4. final def asInstanceOf[T0]: T0

    Definition Classes
    Any

  5. def clone(): AnyRef

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  6. val docBuilderCreator: (DocumentBuilderFactory) ⇒ DocumentBuilder

  7. val docBuilderFactory: DocumentBuilderFactory

  8. final def eq(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  9. def equals(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any

  10. def finalize(): Unit

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
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    @throws( classOf[java.lang.Throwable] )

  11. final def getClass(): Class[_]

    Definition Classes
    AnyRef → Any

  12. def hashCode(): Int

    Definition Classes
    AnyRef → Any

  13. final def isInstanceOf[T0]: Boolean

    Definition Classes
    Any

  14. final def ne(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef

  15. final def notify(): Unit

    Definition Classes
    AnyRef

  16. final def notifyAll(): Unit

    Definition Classes
    AnyRef

  17. def parse(inputStream: InputStream): Document

    Parses the input stream into a yaidom Document.

    Parses the input stream into a yaidom Document. Closes the input stream afterwards.

    Definition Classes
    DocumentParserUsingDom → DocumentParser

  18. final def parse(file: File): Document

    Parses the content of the given File into a eu.cdevreeze.yaidom.simple.Document.

    Parses the content of the given File into a eu.cdevreeze.yaidom.simple.Document.

    Definition Classes
    AbstractDocumentParser → DocumentParser

  19. final def parse(uri: URI): Document

    Parses the content of the given URI into a eu.cdevreeze.yaidom.simple.Document.

    Parses the content of the given URI into a eu.cdevreeze.yaidom.simple.Document.

    Definition Classes
    AbstractDocumentParser → DocumentParser

  20. final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
    AnyRef

  21. def toString(): String

    Definition Classes
    AnyRef → Any

  22. final def wait(): Unit

    Definition Classes
    AnyRef
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    @throws( ... )

  23. final def wait(arg0: Long, arg1: Int): Unit

    Definition Classes
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    @throws( ... )

  24. final def wait(arg0: Long): Unit

    Definition Classes
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Inherited from AbstractDocumentParser

Inherited from DocumentParser

Inherited from AnyRef

Inherited from Any

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