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## org.jdom.input
Class SAXBuilder

    java.lang.Object
      |
      +--org.jdom.input.SAXBuilder

public class SAXBuilder
extends java.lang.Object

Builds a JDOM document from files, streams, readers, URLs, or a SAX `InputSource` instance using a SAX parser. The builder uses a third-party SAX parser (chosen by JAXP by default, or you can choose manually) to handle the parsing duties and simply listens to the SAX events to construct a document. Details which SAX does not provide, such as whitespace outside the root element, are not represented in the JDOM document. Information about SAX can be found at http://www.saxproject.org.

Known issues: Relative paths for a `DocType` or `EntityRef` may be converted by the SAX parser into absolute paths.

Version:
  $Revision: 1.89 $, $Date: 2004/09/03 18:24:28 $
Author:
  Jason Hunter, Brett McLaughlin, Dan Schaffer, Philip Nelson, Alex Rosen

Constructor Summary
`SAXBuilder()` Creates a new SAXBuilder which will attempt to first locate a parser via JAXP, then will try to use a set of default SAX Drivers.
`SAXBuilder(boolean validate)` Creates a new SAXBuilder which will attempt to first locate a parser via JAXP, then will try to use a set of default SAX Drivers.
`SAXBuilder(java.lang.String saxDriverClass)` Creates a new SAXBuilder using the specified SAX parser.
`SAXBuilder(java.lang.String saxDriverClass, boolean validate)` Creates a new SAXBuilder using the specified SAX parser.

Method Summary
`Document` | `build(java.io.File file)` This builds a document from the supplied filename.
`Document` | `build(org.xml.sax.InputSource in)` This builds a document from the supplied input source.
`Document` | `build(java.io.InputStream in)` This builds a document from the supplied input stream.
`Document` | `build(java.io.InputStream in, java.lang.String systemId)` This builds a document from the supplied input stream.
`Document` | `build(java.io.Reader characterStream)` This builds a document from the supplied Reader.
`Document` | `build(java.io.Reader characterStream, java.lang.String systemId)` This builds a document from the supplied Reader.
`Document` | `build(java.lang.String systemId)` This builds a document from the supplied URI.
`Document` | `build(java.net.URL url)` This builds a document from the supplied URL.
`protected void` | `configureContentHandler(SAXHandler contentHandler)` This configures the SAXHandler that will be used to build the Document.
`protected void` | `configureParser(org.xml.sax.XMLReader parser, SAXHandler contentHandler)` This configures the XMLReader to be used for reading the XML document.
`protected SAXHandler` | `createContentHandler()` This creates the SAXHandler that will be used to build the Document.
`protected org.xml.sax.XMLReader` | `createParser()` This creates the XMLReader to be used for reading the XML document.
`java.lang.String` | `getDriverClass()` Returns the driver class assigned in the constructor, or null if none.
`org.xml.sax.DTDHandler` | `getDTDHandler()` Returns the `DTDHandler` assigned, or null if none.
`org.xml.sax.EntityResolver` | `getEntityResolver()` Returns the `EntityResolver` assigned, or null if none.
`org.xml.sax.ErrorHandler` | `getErrorHandler()` Returns the `ErrorHandler` assigned, or null if none.
`boolean` | `getExpandEntities()` Returns whether or not entities are being expanded into normal text content.
`JDOMFactory` | `getFactory()` Returns the current `JDOMFactory` in use.
`boolean` | `getIgnoringElementContentWhitespace()` Returns whether element content whitespace is to be ignored during the build.
`boolean` | `getReuseParser()` Returns whether the contained SAX parser instance is reused across multiple parses.
`boolean` | `getValidation()` Returns whether validation is to be performed during the build.
`org.xml.sax.XMLFilter` | `getXMLFilter()` Returns the `XMLFilter` used during parsing, or null if none.
`void` | `setDTDHandler(org.xml.sax.DTDHandler dtdHandler)` This sets custom DTDHandler for the `Builder`.
`void` | `setEntityResolver(org.xml.sax.EntityResolver entityResolver)` This sets custom EntityResolver for the `Builder`.
`void` | `setErrorHandler(org.xml.sax.ErrorHandler errorHandler)` This sets custom ErrorHandler for the `Builder`.
`void` | `setExpandEntities(boolean expand)` This sets whether or not to expand entities for the builder.
`void` | `setFactory(JDOMFactory factory)` This sets a custom JDOMFactory for the builder.
`void` | `setFeature(java.lang.String name, boolean value)` This sets a feature on the SAX parser.
`void` | `setIgnoringElementContentWhitespace(boolean ignoringWhite)` Specifies whether or not the parser should elminate whitespace in element content (sometimes known as "ignorable whitespace") when building the document.
`void` | `setProperty(java.lang.String name, java.lang.Object value)` This sets a property on the SAX parser.
`void` | `setReuseParser(boolean reuseParser)` Specifies whether this builder shall reuse the same SAX parser when performing subsequent parses or allocate a new parser for each parse.
`void` | `setValidation(boolean validate)` This sets validation for the builder.
`void` | `setXMLFilter(org.xml.sax.XMLFilter xmlFilter)` This sets a custom `XMLFilter` for the builder.

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

Constructor Detail

### SAXBuilder

    public SAXBuilder()

  Creates a new SAXBuilder which will attempt to first locate a parser via JAXP, then will try to use a set of default SAX Drivers. The underlying parser will not validate.

### SAXBuilder

    public SAXBuilder(boolean validate)

  Creates a new SAXBuilder which will attempt to first locate a parser via JAXP, then will try to use a set of default SAX Drivers. The underlying parser will validate or not according to the given parameter.
  Parameters:
    `validate` - `boolean` indicating if validation should occur.

### SAXBuilder

    public SAXBuilder(java.lang.String saxDriverClass)

  Creates a new SAXBuilder using the specified SAX parser. The underlying parser will not validate.
  Parameters:
    `saxDriverClass` - `String` name of SAX Driver to use for parsing.

### SAXBuilder

    public SAXBuilder(java.lang.String saxDriverClass,
                      boolean validate)

  Creates a new SAXBuilder using the specified SAX parser. The underlying parser will validate or not according to the given parameter.
  Parameters:
    `saxDriverClass` - `String` name of SAX Driver to use for parsing.
    `validate` - `boolean` indicating if validation should occur.

Method Detail

### getDriverClass

    public java.lang.String getDriverClass()

  Returns the driver class assigned in the constructor, or null if none.
  Returns:
    the driver class assigned in the constructor

### getFactory

    public JDOMFactory getFactory()

  Returns the current `JDOMFactory` in use.
  Returns:
    the factory in use

### setFactory

    public void setFactory(JDOMFactory factory)

  This sets a custom JDOMFactory for the builder. Use this to build the tree with your own subclasses of the JDOM classes.
  Parameters:
    `factory` - `JDOMFactory` to use

### getValidation

    public boolean getValidation()

  Returns whether validation is to be performed during the build.
  Returns:
    whether validation is to be performed during the build

### setValidation

    public void setValidation(boolean validate)

  This sets validation for the builder.
  Parameters:
    `validate` - `boolean` indicating whether validation should occur.

### getErrorHandler

    public org.xml.sax.ErrorHandler getErrorHandler()

  Returns the `ErrorHandler` assigned, or null if none.
  Returns:
    the ErrorHandler assigned, or null if none

### setErrorHandler

    public void setErrorHandler(org.xml.sax.ErrorHandler errorHandler)

  This sets custom ErrorHandler for the `Builder`.
  Parameters:
    `errorHandler` - `ErrorHandler`

### getEntityResolver

    public org.xml.sax.EntityResolver getEntityResolver()

  Returns the `EntityResolver` assigned, or null if none.
  Returns:
    the EntityResolver assigned

### setEntityResolver

    public void setEntityResolver(org.xml.sax.EntityResolver entityResolver)

  This sets custom EntityResolver for the `Builder`.
  Parameters:
    `entityResolver` - `EntityResolver`

### getDTDHandler

    public org.xml.sax.DTDHandler getDTDHandler()

  Returns the `DTDHandler` assigned, or null if none.
  Returns:
    the DTDHandler assigned

### setDTDHandler

    public void setDTDHandler(org.xml.sax.DTDHandler dtdHandler)

  This sets custom DTDHandler for the `Builder`.
  Parameters:
    `dtdHandler` - `DTDHandler`

### getXMLFilter

    public org.xml.sax.XMLFilter getXMLFilter()

  Returns the `XMLFilter` used during parsing, or null if none.
  Returns:
    the XMLFilter used during parsing

### setXMLFilter

    public void setXMLFilter(org.xml.sax.XMLFilter xmlFilter)

  This sets a custom `XMLFilter` for the builder.
  Parameters:
    `xmlFilter` - the filter to use

### getIgnoringElementContentWhitespace

    public boolean getIgnoringElementContentWhitespace()

  Returns whether element content whitespace is to be ignored during the build.
  Returns:
    whether element content whitespace is to be ignored during the build

### setIgnoringElementContentWhitespace

    public void setIgnoringElementContentWhitespace(boolean ignoringWhite)

  Specifies whether or not the parser should elminate whitespace in element content (sometimes known as "ignorable whitespace") when building the document. Only whitespace which is contained within element content that has an element only content model will be eliminated (see XML Rec 3.2.1). For this setting to take effect requires that validation be turned on. The default value of this setting is `false`.
  Parameters:
    `ignoringWhite` - Whether to ignore ignorable whitespace

### getReuseParser

    public boolean getReuseParser()

  Returns whether the contained SAX parser instance is reused across multiple parses. The default is true.
  Returns:
    whether the contained SAX parser instance is reused across multiple parses

### setReuseParser

    public void setReuseParser(boolean reuseParser)

  Specifies whether this builder shall reuse the same SAX parser when performing subsequent parses or allocate a new parser for each parse. The default value of this setting is `true` (parser reuse).

  Note: As SAX parser instances are not thread safe, the parser reuse feature should not be used with SAXBuilder instances shared among threads.

  Parameters:
    `reuseParser` - Whether to reuse the SAX parser.

### setFeature

    public void setFeature(java.lang.String name,
                           boolean value)

  This sets a feature on the SAX parser. See the SAX documentation for

  NOTE: SAXBuilder requires that some particular features of the SAX parser be set up in certain ways for it to work properly. The list of such features may change in the future. Therefore, the use of this method may cause parsing to break, and even if it doesn't break anything today it might break parsing in a future JDOM version, because what JDOM parsers require may change over time. Use with caution.

  Parameters:
    `name` - The feature name, which is a fully-qualified URI.
    `value` - The requested state of the feature (true or false).

### setProperty

    public void setProperty(java.lang.String name,
                            java.lang.Object value)

  This sets a property on the SAX parser. See the SAX documentation for more information.

  NOTE: SAXBuilder requires that some particular properties of the SAX parser be set up in certain ways for it to work properly. The list of such properties may change in the future. Therefore, the use of this method may cause parsing to break, and even if it doesn't break anything today it might break parsing in a future JDOM version, because what JDOM parsers require may change over time. Use with caution.

  Parameters:
    `name` - The property name, which is a fully-qualified URI.
    `value` - The requested value for the property.

### build

    public Document build(org.xml.sax.InputSource in)
                   throws JDOMException,
                          java.io.IOException

  This builds a document from the supplied input source.
  Parameters:
    `in` - `InputSource` to read from
  Returns:
    `Document` resultant Document object
  Throws:
    JDOMException - when errors occur in parsing
    java.io.IOException - when an I/O error prevents a document from being fully parsed

### createContentHandler

    protected SAXHandler createContentHandler()

  This creates the SAXHandler that will be used to build the Document.
  Returns:
    `SAXHandler` - resultant SAXHandler object.

### configureContentHandler

    protected void configureContentHandler(SAXHandler contentHandler)

  This configures the SAXHandler that will be used to build the Document.

  The default implementation simply passes through some configuration settings that were set on the SAXBuilder: setExpandEntities() and setIgnoringElementContentWhitespace().

### createParser

    protected org.xml.sax.XMLReader createParser()
                                          throws JDOMException

  This creates the XMLReader to be used for reading the XML document.

  The default behavior is to (1) use the saxDriverClass, if it has been set, (2) try to obtain a parser from JAXP, if it is available, and (3) if all else fails, use a hard-coded default parser (currently the Xerces parser). Subclasses may override this method to determine the parser to use in a different way.

  Returns:
    `XMLReader` - resultant XMLReader object.

### configureParser

    protected void configureParser(org.xml.sax.XMLReader parser,
                                   SAXHandler contentHandler)
                            throws JDOMException

  This configures the XMLReader to be used for reading the XML document.

  The default implementation sets various options on the given XMLReader, such as validation, DTD resolution, entity handlers, etc., according to the options that were set (e.g. via `setEntityResolver`) and set various SAX properties and features that are required for JDOM internals. These features may change in future releases, so change this behavior at your own risk.

### build

    public Document build(java.io.InputStream in)
                   throws JDOMException,
                          java.io.IOException

  This builds a document from the supplied input stream.

  Parameters:
    `in` - `InputStream` to read from
  Returns:
    `Document` resultant Document object
  Throws:
    JDOMException - when errors occur in parsing
    java.io.IOException - when an I/O error prevents a document from being fully parsed.

### build

    public Document build(java.io.File file)
                   throws JDOMException,
                          java.io.IOException

  This builds a document from the supplied filename.

  Parameters:
    `file` - `File` to read from
  Returns:
    `Document` resultant Document object
  Throws:
    JDOMException - when errors occur in parsing
    java.io.IOException - when an I/O error prevents a document from being fully parsed

### build

    public Document build(java.net.URL url)
                   throws JDOMException,
                          java.io.IOException

  This builds a document from the supplied URL.

  Parameters:
    `url` - `URL` to read from.
  Returns:
    `Document` - resultant Document object.
  Throws:
    JDOMException - when errors occur in parsing
    java.io.IOException - when an I/O error prevents a document from being fully parsed.

### build

    public Document build(java.io.InputStream in,
                          java.lang.String systemId)
                   throws JDOMException,
                          java.io.IOException

  This builds a document from the supplied input stream.

  Parameters:
    `in` - `InputStream` to read from.
    `systemId` - base for resolving relative URIs
  Returns:
    `Document` resultant Document object
  Throws:
    JDOMException - when errors occur in parsing
    java.io.IOException - when an I/O error prevents a document from being fully parsed

### build

    public Document build(java.io.Reader characterStream)
                   throws JDOMException,
                          java.io.IOException

  This builds a document from the supplied Reader. It's the programmer's responsibility to make sure the reader matches the encoding of the file. It's often easier and safer to use an InputStream rather than a Reader, and to let the parser auto-detect the encoding from the XML declaration.

  Parameters:
    `characterStream` - `Reader` to read from
  Returns:
    `Document` resultant Document object
  Throws:
    JDOMException - when errors occur in parsing
    java.io.IOException - when an I/O error prevents a document from being fully parsed

### build

    public Document build(java.io.Reader characterStream,
                          java.lang.String systemId)
                   throws JDOMException,
                          java.io.IOException

  This builds a document from the supplied Reader. It's the programmer's responsibility to make sure the reader matches the encoding of the file. It's often easier and safer to use an InputStream rather than a Reader, and to let the parser auto-detect the encoding from the XML declaration.

  Parameters:
    `characterStream` - `Reader` to read from.
    `systemId` - base for resolving relative URIs
  Returns:
    `Document` resultant Document object
  Throws:
    JDOMException - when errors occur in parsing
    java.io.IOException - when an I/O error prevents a document from being fully parsed

### build

    public Document build(java.lang.String systemId)
                   throws JDOMException,
                          java.io.IOException

  This builds a document from the supplied URI.

  Parameters:
    `systemId` - URI for the input
  Returns:
    `Document` resultant Document object
  Throws:
    JDOMException - when errors occur in parsing
    java.io.IOException - when an I/O error prevents a document from being fully parsed

### getExpandEntities

    public boolean getExpandEntities()

  Returns whether or not entities are being expanded into normal text content.
  Returns:
    whether entities are being expanded

### setExpandEntities

    public void setExpandEntities(boolean expand)

  This sets whether or not to expand entities for the builder. A true means to expand entities as normal content. A false means to leave entities unexpanded as `EntityRef` objects. The default is true.

  When this setting is false, the internal DTD subset is retained; when this setting is true, the internal DTD subset is not retained.

  Note that Xerces (at least up to 1.4.4) has a bug where entities in attribute values will be misreported if this flag is turned off, resulting in entities to appear within element content. When turning entity expansion off either avoid entities in attribute values, or use another parser like Crimson. http://nagoya.apache.org/bugzilla/show_bug.cgi?id=6111

  Parameters:
    `expand` - `boolean` indicating whether entity expansion should occur.

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| JDOM 1.0
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Copyright © 2004 Jason Hunter, Brett McLaughlin. All Rights Reserved.