JDBCSQLXML.SAX2XMLStreamWriter (HSQLDB 2.3.4 API)
Date: 2016-05-15

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## org.hsqldb.jdbc
Class JDBCSQLXML.SAX2XMLStreamWriter

    java.lang.Object
      org.hsqldb.jdbc.JDBCSQLXML.SAX2XMLStreamWriter

All Implemented Interfaces:
  Closeable, ContentHandler

Enclosing class:
  JDBCSQLXML

    public static class JDBCSQLXML.SAX2XMLStreamWriter

extends Object
implements ContentHandler, Closeable

Writes to a `XMLStreamWriter` from SAX events.

Constructor Summary
`JDBCSQLXML.SAX2XMLStreamWriter(XMLStreamWriter writer)` Constructs a new SAX2XMLStreamWriter that writes SAX events to the designated XMLStreamWriter.

Method Summary
`void` | `characters(char[] ch, int start, int length)` Receive notification of character data.
`void` | `close()` Closes this object.
`void` | `comment(char[] ch, int start, int length)`
`void` | `endDocument()` Receive notification of the end of a document.
`void` | `endElement(String namespaceURI, String localName, String qName)` Receive notification of the end of an element.
`void` | `endPrefixMapping(String prefix)` End the scope of a prefix-URI mapping.
`Locator` | `getDocumentLocator()` Retrieves the Locator.
`XMLStreamWriter` | `getWriter()`
`void` | `ignorableWhitespace(char[] ch, int start, int length)` Receive notification of ignorable whitespace in element content.
`boolean` | `isClosed()` Retrieves whether this object is closed.
`void` | `processingInstruction(String target, String data)` Receive notification of a processing instruction.
`void` | `setDocumentLocator(Locator locator)` Receive an object for locating the origin of SAX document events.
`void` | `skippedEntity(String name)` Receive notification of a skipped entity.
`void` | `startDocument()` Receive notification of the beginning of a document.
`void` | `startElement(String namespaceURI, String localName, String qName, Attributes atts)` Receive notification of the beginning of an element.
`void` | `startPrefixMapping(String prefix, String uri)` Begin the scope of a prefix-URI Namespace mapping.

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### JDBCSQLXML.SAX2XMLStreamWriter

    public JDBCSQLXML.SAX2XMLStreamWriter(XMLStreamWriter writer)

  Constructs a new SAX2XMLStreamWriter that writes SAX events to the designated XMLStreamWriter.

  Parameters:
    `writer` - the writer to which to write SAX events

Method Detail

### startDocument

    public void startDocument()
                       throws SAXException

  Receive notification of the beginning of a document.

  The SAX parser will invoke this method only once, before any other event callbacks (except for `setDocumentLocator`).

  Specified by:
    `startDocument` in interface `ContentHandler`
  Throws:
    `SAXException` - any SAX exception, possibly wrapping another exception
  See Also:
    `endDocument()`

### endDocument

    public void endDocument()
                     throws SAXException

  Receive notification of the end of a document.

  There is an apparent contradiction between the documentation for this method and the documentation for `ErrorHandler.fatalError(org.xml.sax.SAXParseException)`. Until this ambiguity is resolved in a future major release, clients should make no assumptions about whether endDocument() will or will not be invoked when the parser has reported a fatalError() or thrown an exception.

  The SAX parser will invoke this method only once, and it will be the last method invoked during the parse. The parser shall not invoke this method until it has either abandoned parsing (because of an unrecoverable error) or reached the end of input.

  Specified by:
    `endDocument` in interface `ContentHandler`
  Throws:
    `SAXException` - any SAX exception, possibly wrapping another exception
  See Also:
    `startDocument()`

### characters

    public void characters(char[] ch,
                           int start,
                           int length)
                    throws SAXException

  Receive notification of character data.

  The Parser will call this method to report each chunk of character data. SAX parsers may return all contiguous character data in a single chunk, or they may split it into several chunks; however, all of the characters in any single event must come from the same external entity so that the Locator provides useful information.

  The application must not attempt to read from the array outside of the specified range.

  Individual characters may consist of more than one Java `char` value. There are two important cases where this happens, because characters can't be represented in just sixteen bits. In one case, characters are represented in a Surrogate Pair, using two special Unicode values. Such characters are in the so-called "Astral Planes", with a code point above U+FFFF. A second case involves composite characters, such as a base character combining with one or more accent characters.

  Your code should not assume that algorithms using `char`-at-a-time idioms will be working in character units; in some cases they will split characters. This is relevant wherever XML permits arbitrary characters, such as attribute values, processing instruction data, and comments as well as in data reported from this method. It's also generally relevant whenever Java code manipulates internationalized text; the issue isn't unique to XML.

  Note that some parsers will report whitespace in element content using the `ignorableWhitespace` method rather than this one (validating parsers must do so).

  Specified by:
    `characters` in interface `ContentHandler`
  Parameters:
    `ch` - the characters from the XML document
    `start` - the start position in the array
    `length` - the number of characters to read from the array
  Throws:
    `SAXException` - any SAX exception, possibly wrapping another exception
  See Also:
    `ignorableWhitespace(char[], int, int)`, `Locator`

### startElement

    public void startElement(String namespaceURI,
                             String localName,
                             String qName,
                             Attributes atts)
                      throws SAXException

  Receive notification of the beginning of an element.

  The Parser will invoke this method at the beginning of every element in the XML document; there will be a corresponding `endElement` event for every startElement event (even when the element is empty). All of the element's content will be reported, in order, before the corresponding endElement event.

  This event allows up to three name components for each element:

  1. the Namespace URI;
  2. the local name; and
  3. the qualified (prefixed) name.

  Any or all of these may be provided, depending on the values of the http://xml.org/sax/features/namespaces and the http://xml.org/sax/features/namespace-prefixes properties:

  - the Namespace URI and local name are required when the namespaces property is true (the default), and are optional when the namespaces property is false (if one is specified, both must be);
  - the qualified name is required when the namespace-prefixes property is true, and is optional when the namespace-prefixes property is false (the default).

  Note that the attribute list provided will contain only attributes with explicit values (specified or defaulted): #IMPLIED attributes will be omitted. The attribute list will contain attributes used for Namespace declarations (xmlns* attributes) only if the `http://xml.org/sax/features/namespace-prefixes` property is true (it is false by default, and support for a true value is optional).

  Like `characters()`, attribute values may have characters that need more than one `char` value.

  Specified by:
    `startElement` in interface `ContentHandler`
  Parameters:
    `namespaceURI` - the Namespace URI, or the empty string if the element has no Namespace URI or if Namespace processing is not being performed
    `localName` - the local name (without prefix), or the empty string if Namespace processing is not being performed
    `qName` - the qualified name (with prefix), or the empty string if qualified names are not available
    `atts` - the attributes attached to the element. If there are no attributes, it shall be an empty Attributes object. The value of this object after startElement returns is undefined
  Throws:
    `SAXException` - any SAX exception, possibly wrapping another exception
  See Also:
    `endElement(java.lang.String, java.lang.String, java.lang.String)`, `Attributes`, `AttributesImpl`

### endElement

    public void endElement(String namespaceURI,
                           String localName,
                           String qName)
                    throws SAXException

  Receive notification of the end of an element.

  The SAX parser will invoke this method at the end of every element in the XML document; there will be a corresponding `startElement` event for every endElement event (even when the element is empty).

  For information on the names, see startElement.

  Specified by:
    `endElement` in interface `ContentHandler`
  Parameters:
    `namespaceURI` - the Namespace URI, or the empty string if the element has no Namespace URI or if Namespace processing is not being performed
    `localName` - the local name (without prefix), or the empty string if Namespace processing is not being performed
    `qName` - the qualified XML name (with prefix), or the empty string if qualified names are not available
  Throws:
    `SAXException` - any SAX exception, possibly wrapping another exception

### startPrefixMapping

    public void startPrefixMapping(String prefix,
                                   String uri)
                            throws SAXException

  Begin the scope of a prefix-URI Namespace mapping.

  The information from this event is not necessary for normal Namespace processing: the SAX XML reader will automatically replace prefixes for element and attribute names when the `http://xml.org/sax/features/namespaces` feature is true (the default).

  There are cases, however, when applications need to use prefixes in character data or in attribute values, where they cannot safely be expanded automatically; the start/endPrefixMapping event supplies the information to the application to expand prefixes in those contexts itself, if necessary.

  Note that start/endPrefixMapping events are not guaranteed to be properly nested relative to each other: all startPrefixMapping events will occur immediately before the corresponding `startElement` event, and all `endPrefixMapping` events will occur immediately after the corresponding `endElement` event, but their order is not otherwise guaranteed.

  There should never be start/endPrefixMapping events for the "xml" prefix, since it is predeclared and immutable.

  Specified by:
    `startPrefixMapping` in interface `ContentHandler`
  Parameters:
    `prefix` - the Namespace prefix being declared. An empty string is used for the default element namespace, which has no prefix.
    `uri` - the Namespace URI the prefix is mapped to
  Throws:
    `SAXException` - the client may throw an exception during processing
  See Also:
    `endPrefixMapping(java.lang.String)`, `startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes)`

### endPrefixMapping

    public void endPrefixMapping(String prefix)
                          throws SAXException

  End the scope of a prefix-URI mapping.

  See `startPrefixMapping` for details. These events will always occur immediately after the corresponding `endElement` event, but the order of `endPrefixMapping` events is not otherwise guaranteed.

  Specified by:
    `endPrefixMapping` in interface `ContentHandler`
  Parameters:
    `prefix` - the prefix that was being mapped. This is the empty string when a default mapping scope ends.
  Throws:
    `SAXException` - the client may throw an exception during processing
  See Also:
    `startPrefixMapping(java.lang.String, java.lang.String)`, `endElement(java.lang.String, java.lang.String, java.lang.String)`

### ignorableWhitespace

    public void ignorableWhitespace(char[] ch,
                                    int start,
                                    int length)
                             throws SAXException

  Receive notification of ignorable whitespace in element content.

  Validating Parsers must use this method to report each chunk of whitespace in element content (see the W3C XML 1.0 recommendation, section 2.10): non-validating parsers may also use this method if they are capable of parsing and using content models.

  SAX parsers may return all contiguous whitespace in a single chunk, or they may split it into several chunks; however, all of the characters in any single event must come from the same external entity, so that the Locator provides useful information.

  The application must not attempt to read from the array outside of the specified range.

  Specified by:
    `ignorableWhitespace` in interface `ContentHandler`
  Parameters:
    `ch` - the characters from the XML document
    `start` - the start position in the array
    `length` - the number of characters to read from the array
  Throws:
    `SAXException` - any SAX exception, possibly wrapping another exception
  See Also:
    `characters(char[], int, int)`

### processingInstruction

    public void processingInstruction(String target,
                                      String data)
                               throws SAXException

  Receive notification of a processing instruction.

  The Parser will invoke this method once for each processing instruction found: note that processing instructions may occur before or after the main document element.

  A SAX parser must never report an XML declaration (XML 1.0, section 2.8) or a text declaration (XML 1.0, section 4.3.1) using this method.

  Like `characters()`, processing instruction data may have characters that need more than one `char` value.

  Specified by:
    `processingInstruction` in interface `ContentHandler`
  Parameters:
    `target` - the processing instruction target
    `data` - the processing instruction data, or null if none was supplied. The data does not include any whitespace separating it from the target
  Throws:
    `SAXException` - any SAX exception, possibly wrapping another exception

### setDocumentLocator

    public void setDocumentLocator(Locator locator)

  Receive an object for locating the origin of SAX document events.

  SAX parsers are strongly encouraged (though not absolutely required) to supply a locator: if it does so, it must supply the locator to the application by invoking this method before invoking any of the other methods in the ContentHandler interface.

  The locator allows the application to determine the end position of any document-related event, even if the parser is not reporting an error. Typically, the application will use this information for reporting its own errors (such as character content that does not match an application's business rules). The information returned by the locator is probably not sufficient for use with a search engine.

  Note that the locator will return correct information only during the invocation SAX event callbacks after `startDocument` returns and before `endDocument` is called. The application should not attempt to use it at any other time.

  Specified by:
    `setDocumentLocator` in interface `ContentHandler`
  Parameters:
    `locator` - an object that can return the location of any SAX document event
  See Also:
    `Locator`

### getDocumentLocator

    public Locator getDocumentLocator()

  Retrieves the Locator.

  Returns:
    the Locator

### skippedEntity

    public void skippedEntity(String name)
                       throws SAXException

  Receive notification of a skipped entity. This is not called for entity references within markup constructs such as element start tags or markup declarations. (The XML recommendation requires reporting skipped external entities. SAX also reports internal entity expansion/non-expansion, except within markup constructs.)

  The Parser will invoke this method each time the entity is skipped. Non-validating processors may skip entities if they have not seen the declarations (because, for example, the entity was declared in an external DTD subset). All processors may skip external entities, depending on the values of the `http://xml.org/sax/features/external-general-entities` and the `http://xml.org/sax/features/external-parameter-entities` properties.

  Specified by:
    `skippedEntity` in interface `ContentHandler`
  Parameters:
    `name` - the name of the skipped entity. If it is a parameter entity, the name will begin with '%', and if it is the external DTD subset, it will be the string "[dtd]"
  Throws:
    `SAXException` - any SAX exception, possibly wrapping another exception

### comment

    public void comment(char[] ch,
                        int start,
                        int length)
                 throws SAXException

  Throws:
    `SAXException`

### getWriter

    public XMLStreamWriter getWriter()

### close

    public void close()
               throws IOException

  Closes this object.

  Specified by:
    `close` in interface `Closeable`
  Throws:
    `IOException`

### isClosed

    public boolean isClosed()

  Retrieves whether this object is closed.

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