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.

  }




  @Test
  public void testParseSimpleTopologyXmlInHadoopFormat() throws IOException, SAXException, URISyntaxException {
    Digester digester = loader.newDigester();
    String name = "org/apache/hadoop/gateway/topology/xml/simple-topology-ambari-format.conf";
    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( "topology2" ) );

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    assertThat( identityAssertionProvider.getParams().get("name"), is( "user.name" ) );
  }


  @Test
  public void testParseServiceParamsInAmbariFormat() throws IOException, SAXException {
    Digester digester = loader.newDigester();
    String name = "org/apache/hadoop/gateway/topology/xml/service-param-topology-ambari-format.conf";
    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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    return "xml";
  }


  @Override
  public UrlRewriteRulesDescriptor load( Reader reader ) throws IOException {
    Digester digester = loader.newDigester( new ExtendedBaseRules() );
    digester.setValidating( false );
    try {
      UrlRewriteRulesDescriptor rules = digester.parse( reader );
      return rules;
    } catch( SAXException e ) {
      throw new IOException( e );
    }
  }

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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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      this.method = method;
    }


    @Override
    public void begin( String namespace, String name, Attributes attributes ) throws Exception {
      Digester digester = getDigester();
      digester.push( MethodUtils.invokeMethod( digester.peek(), method, NO_PARAMS ) );
    }

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    this( null, VFS.getManager().toFileObject( directory ) );
  }


  private static Topology loadTopology( FileObject file ) throws IOException, SAXException {
    log.loadingTopologyFile( file.getName().getFriendlyURI() );
    Digester digester = digesterLoader.newDigester();
    FileContent content = file.getContent();
    Topology topology = digester.parse( content.getInputStream() );
    topology.setName( FilenameUtils.removeExtension( file.getName().getBaseName() ) );
    topology.setTimestamp( content.getLastModifiedTime() );
    return topology;
  }

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  public void tearDown() throws Exception {
  }


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


    assertThat( topology.getName(), is( "topology" ) );
    assertThat( topology.getTimestamp(), is( file.lastModified() ) );

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    return "xml";
  }


  @Override
  public GatewayDescriptor load( Reader reader ) throws IOException {
    Digester digester = loader.newDigester( new ExtendedBaseRules() );
    digester.setValidating( false );
    try {
      GatewayDescriptor descriptor = digester.parse( reader );
      return descriptor;
    } catch( SAXException e ) {
      throw new IOException( e );
    }
  }

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     */
    @Before
    public void setUp()
    {


        digester = new Digester();
        digester.setRules( createMatchingRulesForTest() );


    }

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