Examples of org.apache.commons.digester3.Digester

org.apache.commons.digester3.Digester

A Digester processes an XML input stream by matching a series of element nesting patterns to execute Rules that have been added prior to the start of parsing.

See the Digester Developer Guide for more information.

IMPLEMENTATION NOTE - A single Digester instance may only be used within the context of a single thread at a time, and a call to parse() must be completed before another can be initiated even from the same thread.

A Digester instance should not be used for parsing more than one input document. The problem is that the Digester class has quite a few member variables whose values "evolve" as SAX events are received during a parse. When reusing the Digester instance, all these members must be reset back to their initial states before the second parse begins. The "clear()" method makes a stab at resetting these, but it is actually rather a difficult problem. If you are determined to reuse Digester instances, then at the least you should call the clear() method before each parse, and must call it if the Digester parse terminates due to an exception during a parse.

LEGACY IMPLEMENTATION NOTE - When using the legacy XML schema support (instead of using the {@link Schema} class), a bug in Xerces 2.0.2 prevents the support of XML schema. You need Xerces 2.1/2.3 and up tomake this class work with the legacy XML schema support.

This package was inspired by the XmlMapper class that was part of Tomcat 3.0 and 3.1, but is organized somewhat differently.

     */
    @Before
    public void setUp()
    {


        digester = new Digester();


    }

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     * Test rule addition - this boils down to making sure that digester is set properly on rule addition.
     */
    @Test
    public void testAddRule()
    {
        Digester digester = new Digester();
        TestRule rule = new TestRule( "Test" );
        digester.addRule( "/root", rule );


        assertEquals( "Digester is not properly on rule addition.", digester, rule.getDigester() );


    }

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    @Test
    public void testSetNext()
        throws SAXException, IOException
    {
        Digester digester = new Digester();
        digester.setRules( new ExtendedBaseRules() );
        digester.setValidating( false );


        digester.addObjectCreate( "!*/b", BetaBean.class );
        digester.addObjectCreate( "!*/a", AlphaBean.class );
        digester.addObjectCreate( "root", ArrayList.class );
        digester.addSetProperties( "!*" );
        digester.addSetNext( "!*/b/?", "setChild" );
        digester.addSetNext( "!*/a/?", "setChild" );
        digester.addSetNext( "!root/?", "add" );
        ArrayList<?> root = digester.parse( getInputStream( "Test4.xml" ) );


        assertEquals( "Wrong array size", 2, root.size() );
        AlphaBean one = (AlphaBean) root.get( 0 );
        assertTrue( one.getChild() instanceof BetaBean );
        BetaBean two = (BetaBean) one.getChild();

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    @Test
    public void testSetTop()
        throws SAXException, IOException
    {
        Digester digester = new Digester();
        digester.setRules( new ExtendedBaseRules() );
        digester.setValidating( false );


        digester.addObjectCreate( "!*/b", BetaBean.class );
        digester.addObjectCreate( "!*/a", AlphaBean.class );
        digester.addObjectCreate( "root", ArrayList.class );
        digester.addSetProperties( "!*" );
        digester.addSetTop( "!*/b/?", "setParent" );
        digester.addSetTop( "!*/a/?", "setParent" );
        digester.addSetRoot( "!*/a", "add" );
        digester.addSetRoot( "!*/b", "add" );
        ArrayList<?> root = digester.parse( getInputStream( "Test4.xml" ) );


        assertEquals( "Wrong array size", 5, root.size() );


        // note that the array is in popped order (rather than pushed)

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    @Test
    public void testSetCustomProperties()
        throws SAXException, IOException
    {


        Digester digester = new Digester();


        digester.setValidating( false );


        digester.addObjectCreate( "toplevel", ArrayList.class );
        digester.addObjectCreate( "toplevel/one", Address.class );
        digester.addSetNext( "toplevel/one", "add" );
        digester.addObjectCreate( "toplevel/two", Address.class );
        digester.addSetNext( "toplevel/two", "add" );
        digester.addObjectCreate( "toplevel/three", Address.class );
        digester.addSetNext( "toplevel/three", "add" );
        digester.addObjectCreate( "toplevel/four", Address.class );
        digester.addSetNext( "toplevel/four", "add" );
        digester.addSetProperties( "toplevel/one" );
        digester.addSetProperties( "toplevel/two", new String[] { "alt-street", "alt-city", "alt-state" },
                                   new String[] { "street", "city", "state" } );
        digester.addSetProperties( "toplevel/three", new String[] { "aCity", "state" }, new String[] { "city" } );
        digester.addSetProperties( "toplevel/four", "alt-city", "city" );


        ArrayList<?> root = digester.parse( getInputStream( "Test7.xml" ) );


        assertEquals( "Wrong array size", 4, root.size() );


        // note that the array is in popped order (rather than pushed)

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  }


  private class RuleFactory extends Rule {
    @Override
    public void begin( String namespace, String name, Attributes attributes ) throws Exception {
      Digester digester = getDigester();
      UrlRewriteRulesDescriptor rules = digester.peek();
      UrlRewriteRuleDescriptor rule = rules.newRule();
      getDigester().push( rule );
    }

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      getDigester().push( rule );
    }


    @Override
    public void end( String namespace, String name ) throws Exception {
      Digester digester = getDigester();
      UrlRewriteRuleDescriptor rule = digester.pop();
      UrlRewriteRulesDescriptor rules = digester.peek();
      rules.addRule( rule );
    }

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    }
    return topology;
  }


  private static Topology loadTopologyAttempt( File file ) throws IOException, SAXException, URISyntaxException {
    Topology topology;Digester digester = digesterLoader.newDigester();
    TopologyBuilder topologyBuilder = digester.parse( FileUtils.openInputStream( file ) );
    topology = topologyBuilder.build();
    topology.setUri( file.toURI() );
    topology.setName( FilenameUtils.removeExtension( file.getName() ) );
    topology.setTimestamp( file.lastModified() );
    return topology;

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  public void tearDown() throws Exception {
  }


  @Test
  public void testParseSimpleTopologyXmlInKnoxFormat() throws IOException, SAXException, URISyntaxException {
    Digester digester = loader.newDigester();
    String name = "org/apache/hadoop/gateway/topology/xml/simple-topology-knox-format.xml";
    URL url = ClassLoader.getSystemResource( name );
    assertThat( "Failed to find URL for resource " + name, url, notNullValue() );
    File file = new File( url.getFile() );
    TopologyBuilder topologyBuilder = digester.parse( url );
    Topology topology = topologyBuilder.build();
    assertThat( "Failed to parse resource " + name, topology, notNullValue() );
    topology.setTimestamp( file.lastModified() );


    assertThat( topology.getName(), is( "topology" ) );

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    assertThat( provider.getParams().size(), is(5));
  }


  @Test
  public void testParseServiceParamsInKnoxFormat() throws IOException, SAXException {
    Digester digester = loader.newDigester();
    String name = "org/apache/hadoop/gateway/topology/xml/service-param-topology-knox-format.xml";
    URL url = ClassLoader.getSystemResource( name );
    assertThat( "Failed to find URL for resource " + name, url, notNullValue() );
    File file = new File( url.getFile() );
    TopologyBuilder topologyBuilder = digester.parse( url );
    Topology topology = topologyBuilder.build();
    assertThat( "Failed to parse resource " + name, topology, notNullValue() );
    topology.setTimestamp( file.lastModified() );


    assertThat( topology.getName(), is( "test-topology-name" ) );

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