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Summary: Ctors | Methods | Inherited Methods

# HandlerBase

`public class HandlerBase`
`extends Object` `implements EntityResolver, DTDHandler, DocumentHandler, ErrorHandler`

java.lang.Object
↳ | org.xml.sax.HandlerBase

This class is deprecated.
This class works with the deprecated `DocumentHandler` interface. It has been replaced by the SAX2 `DefaultHandler` class.

Default base class for handlers.

> This module, both source code and documentation, is in the Public Domain, and comes with NO WARRANTY. See http://www.saxproject.org for further information.

This class implements the default behaviour for four SAX1 interfaces: EntityResolver, DTDHandler, DocumentHandler, and ErrorHandler. It is now obsolete, but is included in SAX2 to support legacy SAX1 applications. SAX2 applications should use the `DefaultHandler` class instead.

Application writers can extend this class when they need to implement only part of an interface; parser writers can instantiate this class to provide default handlers when the application has not supplied its own.

Note that the use of this class is optional.

See also:

- `EntityResolver`
- `DTDHandler`
- `DocumentHandler`
- `ErrorHandler`

## Summary

### Public constructors
`HandlerBase()`

### Public methods
`void` | `characters(char[] ch, int start, int length)` Receive notification of character data inside an element.
`void` | `endDocument()` Receive notification of the end of the document.
`void` | `endElement(String name)` Receive notification of the end of an element.
`void` | `error(SAXParseException e)` Receive notification of a recoverable parser error.
`void` | `fatalError(SAXParseException e)` Report a fatal XML parsing error.
`void` | `ignorableWhitespace(char[] ch, int start, int length)` Receive notification of ignorable whitespace in element content.
`void` | `notationDecl(String name, String publicId, String systemId)` Receive notification of a notation declaration.
`void` | `processingInstruction(String target, String data)` Receive notification of a processing instruction.
`InputSource` | `resolveEntity(String publicId, String systemId)` Resolve an external entity.
`void` | `setDocumentLocator(Locator locator)` Receive a Locator object for document events.
`void` | `startDocument()` Receive notification of the beginning of the document.
`void` | `startElement(String name, AttributeList attributes)` Receive notification of the start of an element.
`void` | `unparsedEntityDecl(String name, String publicId, String systemId, String notationName)` Receive notification of an unparsed entity declaration.
`void` | `warning(SAXParseException e)` Receive notification of a parser warning.

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
From interface `org.xml.sax.EntityResolver`
`abstract InputSource` | `resolveEntity(String publicId, String systemId)` Allow the application to resolve external entities.
From interface `org.xml.sax.DTDHandler`
`abstract void` | `notationDecl(String name, String publicId, String systemId)` Receive notification of a notation declaration event.
`abstract void` | `unparsedEntityDecl(String name, String publicId, String systemId, String notationName)` Receive notification of an unparsed entity declaration event.
From interface `org.xml.sax.DocumentHandler`
`abstract void` | `characters(char[] ch, int start, int length)` Receive notification of character data.
`abstract void` | `endDocument()` Receive notification of the end of a document.
`abstract void` | `endElement(String name)` Receive notification of the end of an element.
`abstract void` | `ignorableWhitespace(char[] ch, int start, int length)` Receive notification of ignorable whitespace in element content.
`abstract void` | `processingInstruction(String target, String data)` Receive notification of a processing instruction.
`abstract void` | `setDocumentLocator(Locator locator)` Receive an object for locating the origin of SAX document events.
`abstract void` | `startDocument()` Receive notification of the beginning of a document.
`abstract void` | `startElement(String name, AttributeList atts)` Receive notification of the beginning of an element.
From interface `org.xml.sax.ErrorHandler`
`abstract void` | `error(SAXParseException exception)` Receive notification of a recoverable error.
`abstract void` | `fatalError(SAXParseException exception)` Receive notification of a non-recoverable error.
`abstract void` | `warning(SAXParseException exception)` Receive notification of a warning.

## Public constructors

### HandlerBase

    public HandlerBase ()

## Public methods

### characters

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

Receive notification of character data inside an element.

By default, do nothing. Application writers may override this method to take specific actions for each chunk of character data (such as adding the data to a node or buffer, or printing it to a file).

Parameters
`ch` | `char`: The characters.
`start` | `int`: The start position in the character array.
`length` | `int`: The number of characters to use from the character array.

Throws
`SAXException` | Any SAX exception, possibly wrapping another exception.

See also:

- `DocumentHandler.characters(char[], int, int)`

### endDocument

    public void endDocument ()

Receive notification of the end of the document.

By default, do nothing. Application writers may override this method in a subclass to take specific actions at the beginning of a document (such as finalising a tree or closing an output file).

Throws
`SAXException` | Any SAX exception, possibly wrapping another exception.

See also:

- `DocumentHandler.endDocument()`

### endElement

    public void endElement (String name)

Receive notification of the end of an element.

By default, do nothing. Application writers may override this method in a subclass to take specific actions at the end of each element (such as finalising a tree node or writing output to a file).

Parameters
`name` | `String`: the element name

Throws
`SAXException` | Any SAX exception, possibly wrapping another exception.

See also:

- `DocumentHandler.endElement(String)`

### error

    public void error (SAXParseException e)

Receive notification of a recoverable parser error.

The default implementation does nothing. Application writers may override this method in a subclass to take specific actions for each error, such as inserting the message in a log file or printing it to the console.

Parameters
`e` | `SAXParseException`: The warning information encoded as an exception.

Throws
`SAXException` | Any SAX exception, possibly wrapping another exception.

See also:

- `ErrorHandler.warning(SAXParseException)`
- `SAXParseException`

### fatalError

    public void fatalError (SAXParseException e)

Report a fatal XML parsing error.

The default implementation throws a SAXParseException. Application writers may override this method in a subclass if they need to take specific actions for each fatal error (such as collecting all of the errors into a single report): in any case, the application must stop all regular processing when this method is invoked, since the document is no longer reliable, and the parser may no longer report parsing events.

Parameters
`e` | `SAXParseException`: The error information encoded as an exception.

Throws
`SAXException` | Any SAX exception, possibly wrapping another exception.

See also:

- `ErrorHandler.fatalError(SAXParseException)`
- `SAXParseException`

### ignorableWhitespace

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

Receive notification of ignorable whitespace in element content.

By default, do nothing. Application writers may override this method to take specific actions for each chunk of ignorable whitespace (such as adding data to a node or buffer, or printing it to a file).

Parameters
`ch` | `char`: The whitespace characters.
`start` | `int`: The start position in the character array.
`length` | `int`: The number of characters to use from the character array.

Throws
`SAXException` | Any SAX exception, possibly wrapping another exception.

See also:

- `DocumentHandler.ignorableWhitespace(char[], int, int)`

### notationDecl

    public void notationDecl (String name,
                    String publicId,
                    String systemId)

Receive notification of a notation declaration.

By default, do nothing. Application writers may override this method in a subclass if they wish to keep track of the notations declared in a document.

Parameters
`name` | `String`: The notation name.
`publicId` | `String`: The notation public identifier, or null if not available.
`systemId` | `String`: The notation system identifier.

See also:

- `DTDHandler.notationDecl(String, String, String)`

### processingInstruction

    public void processingInstruction (String target,
                    String data)

Receive notification of a processing instruction.

By default, do nothing. Application writers may override this method in a subclass to take specific actions for each processing instruction, such as setting status variables or invoking other methods.

Parameters
`target` | `String`: The processing instruction target.
`data` | `String`: The processing instruction data, or null if none is supplied.

Throws
`SAXException` | Any SAX exception, possibly wrapping another exception.

See also:

- `DocumentHandler.processingInstruction(String, String)`

### resolveEntity

    public InputSource resolveEntity (String publicId,
                    String systemId)

Resolve an external entity.

Always return null, so that the parser will use the system identifier provided in the XML document. This method implements the SAX default behaviour: application writers can override it in a subclass to do special translations such as catalog lookups or URI redirection.

Parameters
`publicId` | `String`: The public identifier, or null if none is available.
`systemId` | `String`: The system identifier provided in the XML document.

Returns
`InputSource` | The new input source, or null to require the default behaviour.

Throws
`SAXException` | Any SAX exception, possibly wrapping another exception.

See also:

- `EntityResolver.resolveEntity(String, String)`

### setDocumentLocator

    public void setDocumentLocator (Locator locator)

Receive a Locator object for document events.

By default, do nothing. Application writers may override this method in a subclass if they wish to store the locator for use with other document events.

Parameters
`locator` | `Locator`: A locator for all SAX document events.

See also:

- `DocumentHandler.setDocumentLocator(Locator)`
- `Locator`

### startDocument

    public void startDocument ()

Receive notification of the beginning of the document.

By default, do nothing. Application writers may override this method in a subclass to take specific actions at the beginning of a document (such as allocating the root node of a tree or creating an output file).

Throws
`SAXException` | Any SAX exception, possibly wrapping another exception.

See also:

- `DocumentHandler.startDocument()`

### startElement

    public void startElement (String name,
                    AttributeList attributes)

Receive notification of the start of an element.

By default, do nothing. Application writers may override this method in a subclass to take specific actions at the start of each element (such as allocating a new tree node or writing output to a file).

Parameters
`name` | `String`: The element type name.
`attributes` | `AttributeList`: The specified or defaulted attributes.

Throws
`SAXException` | Any SAX exception, possibly wrapping another exception.

See also:

- `DocumentHandler.startElement(String, AttributeList)`

### unparsedEntityDecl

    public void unparsedEntityDecl (String name,
                    String publicId,
                    String systemId,
                    String notationName)

Receive notification of an unparsed entity declaration.

By default, do nothing. Application writers may override this method in a subclass to keep track of the unparsed entities declared in a document.

Parameters
`name` | `String`: The entity name.
`publicId` | `String`: The entity public identifier, or null if not available.
`systemId` | `String`: The entity system identifier.
`notationName` | `String`: The name of the associated notation.

See also:

- `DTDHandler.unparsedEntityDecl(String, String, String, String)`

### warning

    public void warning (SAXParseException e)

Receive notification of a parser warning.

The default implementation does nothing. Application writers may override this method in a subclass to take specific actions for each warning, such as inserting the message in a log file or printing it to the console.

Parameters
`e` | `SAXParseException`: The warning information encoded as an exception.

Throws
`SAXException` | Any SAX exception, possibly wrapping another exception.

See also:

- `ErrorHandler.warning(SAXParseException)`
- `SAXParseException`

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