groovy.util

## Class XmlParser

- java.lang.Object
- - groovy.util.XmlParser

- All Implemented Interfaces:
    ContentHandler

      public class XmlParser
      extends Object
      implements ContentHandler

  A helper class for parsing XML into a tree of Node instances for a simple way of processing XML. This parser does not preserve the XML InfoSet - if that's what you need try using W3C DOM, dom4j, JDOM, XOM etc. This parser ignores comments and processing instructions and converts the XML into a Node for each element in the XML with attributes and child Nodes and Strings. This simple model is sufficient for most simple use cases of processing XML.

  Example usage:

       def xml = '<root><one a1="uno!"/><two>Some text!</two></root>'
       def rootNode = new XmlParser().parseText(xml)
       assert rootNode.name() == 'root'
       assert rootNode.one[0].@a1 == 'uno!'
       assert rootNode.two.text() == 'Some text!'
       rootNode.children().each { assert it.name() in ['one','two'] }

  Author:
    James Strachan, Paul King

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `XmlParser()` Creates a non-validating and non-namespace-aware `XmlParser` which does not allow DOCTYPE declarations in documents.
    `XmlParser(boolean validating, boolean namespaceAware)` Creates a `XmlParser` which does not allow DOCTYPE declarations in documents.
    `XmlParser(boolean validating, boolean namespaceAware, boolean allowDocTypeDeclaration)` Creates a `XmlParser`.
    `XmlParser(SAXParser parser)`
    `XmlParser(XMLReader reader)`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected void` | `addTextToNode()`
    `void` | `characters(char[] buffer, int start, int length)`
    `protected Node` | `createNode(Node parent, Object name, Map attributes)` Creates a new node with the given parent, name, and attributes.
    `void` | `endDocument()`
    `void` | `endElement(String namespaceURI, String localName, String qName)`
    `void` | `endPrefixMapping(String prefix)`
    `Locator` | `getDocumentLocator()`
    `DTDHandler` | `getDTDHandler()`
    `protected Object` | `getElementName(String namespaceURI, String localName, String qName)` Return a name given the namespaceURI, localName and qName.
    `EntityResolver` | `getEntityResolver()`
    `ErrorHandler` | `getErrorHandler()`
    `boolean` | `getFeature(String uri)`
    `Object` | `getProperty(String uri)`
    `protected XMLReader` | `getXMLReader()`
    `void` | `ignorableWhitespace(char[] buffer, int start, int len)`
    `boolean` | `isKeepIgnorableWhitespace()` Returns the current keep ignorable whitespace setting.
    `boolean` | `isNamespaceAware()` Determine if namespace handling is enabled.
    `boolean` | `isTrimWhitespace()` Returns the current trim whitespace setting.
    `Node` | `parse(File file)` Parses the content of the given file as XML turning it into a tree of Nodes.
    `Node` | `parse(InputSource input)` Parse the content of the specified input source into a tree of Nodes.
    `Node` | `parse(InputStream input)` Parse the content of the specified input stream into a tree of Nodes.
    `Node` | `parse(Reader in)` Parse the content of the specified reader into a tree of Nodes.
    `Node` | `parse(String uri)` Parse the content of the specified URI into a tree of Nodes.
    `Node` | `parseText(String text)` A helper method to parse the given text as XML.
    `void` | `processingInstruction(String target, String data)`
    `void` | `setDocumentLocator(Locator locator)`
    `void` | `setDTDHandler(DTDHandler dtdHandler)`
    `void` | `setEntityResolver(EntityResolver entityResolver)`
    `void` | `setErrorHandler(ErrorHandler errorHandler)`
    `void` | `setFeature(String uri, boolean value)`
    `void` | `setKeepIgnorableWhitespace(boolean keepIgnorableWhitespace)` Sets the keep ignorable whitespace setting value.
    `void` | `setNamespaceAware(boolean namespaceAware)` Enable and/or disable namespace handling.
    `void` | `setProperty(String uri, Object value)`
    `void` | `setTrimWhitespace(boolean trimWhitespace)` Sets the trim whitespace setting value.
    `void` | `skippedEntity(String name)`
    `void` | `startDocument()`
    `void` | `startElement(String namespaceURI, String localName, String qName, Attributes list)`
    `void` | `startPrefixMapping(String prefix, String namespaceURI)`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### XmlParser

          public XmlParser()
                    throws ParserConfigurationException,
                           SAXException

      Creates a non-validating and non-namespace-aware `XmlParser` which does not allow DOCTYPE declarations in documents.
      Throws:
        `ParserConfigurationException` - if no parser which satisfies the requested configuration can be created.
        `SAXException` - for SAX errors.

    - #### XmlParser

          public XmlParser(boolean validating,
                   boolean namespaceAware)
                    throws ParserConfigurationException,
                           SAXException

      Creates a `XmlParser` which does not allow DOCTYPE declarations in documents.
      Parameters:
        `validating` - `true` if the parser should validate documents as they are parsed; false otherwise.
        `namespaceAware` - `true` if the parser should provide support for XML namespaces; `false` otherwise.
      Throws:
        `ParserConfigurationException` - if no parser which satisfies the requested configuration can be created.
        `SAXException` - for SAX errors.

    - #### XmlParser

          public XmlParser(boolean validating,
                   boolean namespaceAware,
                   boolean allowDocTypeDeclaration)
                    throws ParserConfigurationException,
                           SAXException

      Creates a `XmlParser`.
      Parameters:
        `validating` - `true` if the parser should validate documents as they are parsed; false otherwise.
        `namespaceAware` - `true` if the parser should provide support for XML namespaces; `false` otherwise.
        `allowDocTypeDeclaration` - `true` if the parser should provide support for DOCTYPE declarations; `false` otherwise.
      Throws:
        `ParserConfigurationException` - if no parser which satisfies the requested configuration can be created.
        `SAXException` - for SAX errors.

    - #### XmlParser

          public XmlParser(XMLReader reader)

    - #### XmlParser

          public XmlParser(SAXParser parser)
                    throws SAXException

      Throws:
        `SAXException`

  - ### Method Detail

    - #### isTrimWhitespace

          public boolean isTrimWhitespace()

      Returns the current trim whitespace setting.
      Returns:
        true if whitespace will be trimmed

    - #### setTrimWhitespace

          public void setTrimWhitespace(boolean trimWhitespace)

      Sets the trim whitespace setting value.
      Parameters:
        `trimWhitespace` - the desired setting value

    - #### isKeepIgnorableWhitespace

          public boolean isKeepIgnorableWhitespace()

      Returns the current keep ignorable whitespace setting.
      Returns:
        true if ignorable whitespace will be kept (default false)

    - #### setKeepIgnorableWhitespace

          public void setKeepIgnorableWhitespace(boolean keepIgnorableWhitespace)

      Sets the keep ignorable whitespace setting value.
      Parameters:
        `keepIgnorableWhitespace` - the desired new value

    - #### parse

          public Node parse(File file)
                     throws IOException,
                            SAXException

      Parses the content of the given file as XML turning it into a tree of Nodes.
      Parameters:
        `file` - the File containing the XML to be parsed
      Returns:
        the root node of the parsed tree of Nodes
      Throws:
        `SAXException` - Any SAX exception, possibly wrapping another exception.
        `IOException` - An IO exception from the parser, possibly from a byte stream or character stream supplied by the application.

    - #### parse

          public Node parse(InputSource input)
                     throws IOException,
                            SAXException

      Parse the content of the specified input source into a tree of Nodes.
      Parameters:
        `input` - the InputSource for the XML to parse
      Returns:
        the root node of the parsed tree of Nodes
      Throws:
        `SAXException` - Any SAX exception, possibly wrapping another exception.
        `IOException` - An IO exception from the parser, possibly from a byte stream or character stream supplied by the application.

    - #### parse

          public Node parse(InputStream input)
                     throws IOException,
                            SAXException

      Parse the content of the specified input stream into a tree of Nodes.

      Note that using this method will not provide the parser with any URI for which to find DTDs etc

      Parameters:
        `input` - an InputStream containing the XML to be parsed
      Returns:
        the root node of the parsed tree of Nodes
      Throws:
        `SAXException` - Any SAX exception, possibly wrapping another exception.
        `IOException` - An IO exception from the parser, possibly from a byte stream or character stream supplied by the application.

    - #### parse

          public Node parse(Reader in)
                     throws IOException,
                            SAXException

      Parse the content of the specified reader into a tree of Nodes.

      Note that using this method will not provide the parser with any URI for which to find DTDs etc

      Parameters:
        `in` - a Reader to read the XML to be parsed
      Returns:
        the root node of the parsed tree of Nodes
      Throws:
        `SAXException` - Any SAX exception, possibly wrapping another exception.
        `IOException` - An IO exception from the parser, possibly from a byte stream or character stream supplied by the application.

    - #### parse

          public Node parse(String uri)
                     throws IOException,
                            SAXException

      Parse the content of the specified URI into a tree of Nodes.
      Parameters:
        `uri` - a String containing a uri pointing to the XML to be parsed
      Returns:
        the root node of the parsed tree of Nodes
      Throws:
        `SAXException` - Any SAX exception, possibly wrapping another exception.
        `IOException` - An IO exception from the parser, possibly from a byte stream or character stream supplied by the application.

    - #### parseText

          public Node parseText(String text)
                         throws IOException,
                                SAXException

      A helper method to parse the given text as XML.
      Parameters:
        `text` - the XML text to parse
      Returns:
        the root node of the parsed tree of Nodes
      Throws:
        `SAXException` - Any SAX exception, possibly wrapping another exception.
        `IOException` - An IO exception from the parser, possibly from a byte stream or character stream supplied by the application.

    - #### isNamespaceAware

          public boolean isNamespaceAware()

      Determine if namespace handling is enabled.
      Returns:
        true if namespace handling is enabled

    - #### setNamespaceAware

          public void setNamespaceAware(boolean namespaceAware)

      Enable and/or disable namespace handling.
      Parameters:
        `namespaceAware` - the new desired value

    - #### getDTDHandler

          public DTDHandler getDTDHandler()

    - #### getEntityResolver

          public EntityResolver getEntityResolver()

    - #### getErrorHandler

          public ErrorHandler getErrorHandler()

    - #### getFeature

          public boolean getFeature(String uri)
                             throws SAXNotRecognizedException,
                                    SAXNotSupportedException

      Throws:
        `SAXNotRecognizedException`
        `SAXNotSupportedException`

    - #### getProperty

          public Object getProperty(String uri)
                             throws SAXNotRecognizedException,
                                    SAXNotSupportedException

      Throws:
        `SAXNotRecognizedException`
        `SAXNotSupportedException`

    - #### setDTDHandler

          public void setDTDHandler(DTDHandler dtdHandler)

    - #### setEntityResolver

          public void setEntityResolver(EntityResolver entityResolver)

    - #### setErrorHandler

          public void setErrorHandler(ErrorHandler errorHandler)

    - #### setFeature

          public void setFeature(String uri,
                        boolean value)
                          throws SAXNotRecognizedException,
                                 SAXNotSupportedException

      Throws:
        `SAXNotRecognizedException`
        `SAXNotSupportedException`

    - #### setProperty

          public void setProperty(String uri,
                         Object value)
                           throws SAXNotRecognizedException,
                                  SAXNotSupportedException

      Throws:
        `SAXNotRecognizedException`
        `SAXNotSupportedException`

    - #### startDocument

          public void startDocument()
                             throws SAXException

      Specified by:
        `startDocument` in interface `ContentHandler`
      Throws:
        `SAXException`

    - #### endDocument

          public void endDocument()
                           throws SAXException

      Specified by:
        `endDocument` in interface `ContentHandler`
      Throws:
        `SAXException`

    - #### startElement

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

      Specified by:
        `startElement` in interface `ContentHandler`
      Throws:
        `SAXException`

    - #### endElement

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

      Specified by:
        `endElement` in interface `ContentHandler`
      Throws:
        `SAXException`

    - #### characters

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

      Specified by:
        `characters` in interface `ContentHandler`
      Throws:
        `SAXException`

    - #### startPrefixMapping

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

      Specified by:
        `startPrefixMapping` in interface `ContentHandler`
      Throws:
        `SAXException`

    - #### endPrefixMapping

          public void endPrefixMapping(String prefix)
                                throws SAXException

      Specified by:
        `endPrefixMapping` in interface `ContentHandler`
      Throws:
        `SAXException`

    - #### ignorableWhitespace

          public void ignorableWhitespace(char[] buffer,
                                 int start,
                                 int len)
                                   throws SAXException

      Specified by:
        `ignorableWhitespace` in interface `ContentHandler`
      Throws:
        `SAXException`

    - #### processingInstruction

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

      Specified by:
        `processingInstruction` in interface `ContentHandler`
      Throws:
        `SAXException`

    - #### getDocumentLocator

          public Locator getDocumentLocator()

    - #### setDocumentLocator

          public void setDocumentLocator(Locator locator)

      Specified by:
        `setDocumentLocator` in interface `ContentHandler`

    - #### skippedEntity

          public void skippedEntity(String name)
                             throws SAXException

      Specified by:
        `skippedEntity` in interface `ContentHandler`
      Throws:
        `SAXException`

    - #### getXMLReader

          protected XMLReader getXMLReader()

    - #### addTextToNode

          protected void addTextToNode()

    - #### createNode

          protected Node createNode(Node parent,
                        Object name,
                        Map attributes)

      Creates a new node with the given parent, name, and attributes. The default implementation returns an instance of `groovy.util.Node`.
      Parameters:
        `parent` - the parent node, or null if the node being created is the root node
        `name` - an Object representing the name of the node (typically an instance of `QName`)
        `attributes` - a Map of attribute names to attribute values
      Returns:
        a new Node instance representing the current node

    - #### getElementName

          protected Object getElementName(String namespaceURI,
                              String localName,
                              String qName)

      Return a name given the namespaceURI, localName and qName.
      Parameters:
        `namespaceURI` - the namespace URI
        `localName` - the local name
        `qName` - the qualified name
      Returns:
        the newly created representation of the name