Examples of org.apache.avalon.framework.context.Context

Package org.apache.avalon.framework.context

Examples of org.apache.avalon.framework.context.Context

org.apache.avalon.framework.context.Context
The context is the interface through which the component and its container communicate.

Note: In the text below there are several requirements that a component may set up for a container. It is understood that a container does not have to satisfy those requirements in order to be Avalon-compliant. If a component says "I require X to run" a container may reply with "I don't have any X, so I'm not running you". The requirements here are the maximum that a component may ask for, not the minimum a container must deliver. However, a container should document what it is and isn't capable of delivering.

Each Container-Component relationship involves defining a contract between the two entities. A Context contract is defined by (1) an optional target class, and (2) a set of context entries.
1. The optional target class is an interface, called T below. It is required that the component should be able to perform the following operation:
```
    public void contextualize( Context context ) throws ContextException { T tContext = (T) context; }
```
  The container may choose any method to supply the component with a context instance cast-able to T.
  
  There is no requirement for T to extend the Context interface.
  
  Warning: A component that specifies this requirement will not be as portable as one that doesn't. Few containers support it. It is therefore discouraged for components to require a castable context.
2. The second part of the context contract defines the set of entries the component can access via the Context.get() method, where an entry consists of the key passed to get() and the expected return type (the class or interface). Optionally, an alias for the key name can be specified. The contract associated with a particular entry is defined in the container documentation.
  
  The class/interface T above may also have associated meta-info that specifies entries, in which case these entries must be supplied by the container in addition to any entries the component itself requires.
  
  See: Context Meta-Info Specification
  
  Standard Avalon context entries, their keys, types and and associated semantics are defined under the framework standard attributes table.
  
  See: Avalon Standard Context Entries Specification
  
  Examples, where the data is specified in a sample XML format:
  
  Example 1: Specification of Canonical Key
  
  When a component specifies:
```
    <entry key="avalon:work" type="java.io.File"/>
```
  It should be able to do:
```
    File workDirectory = (File) context.get( "avalon:work" );
```
  in order to obtain the value.
  
  Example 2: Specification of Canonical Key With Aliasing
  
  When a component specifies:
```
    <entry alias="work" key="avalon:work" type="java.io.File"/>
```
  It should be able to do:
```
    File workDirectory = (File) context.get( "work" ); 
```
@author Avalon Development Team @version CVS $Revision: 1.18 $ $Date: 2004/02/11 14:34:25 $

        Map objectModel = new HashMap();
        FlowHelper.setContextObject(objectModel, flowContextObject);
        objectModel.put(ObjectModelHelper.REQUEST_OBJECT, request);
        Map contextObjectModel = new HashMap();
        contextObjectModel.put(ContextHelper.CONTEXT_OBJECT_MODEL, objectModel);
        Context context = new DefaultContext(contextObjectModel);
        Source sampleSource = new ResourceSource("resource://org/apache/cocoon/forms/datatype/FlowJXPathSelectionListTestCase.source.xml");
        Document sample = this.parser.parse(sampleSource.getInputStream());
        Element datatypeElement = (Element) sample.getElementsByTagNameNS(FormsConstants.DEFINITION_NS, "datatype").item(0);
        Datatype datatype = this.datatypeManager.createDatatype(datatypeElement, false);
        FlowJXPathSelectionList list = new FlowJXPathSelectionList

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        if( ( null != annotation ) && !( "".equals( annotation ) ) )
        {
            m_logger.info( annotation );
        }


        Context context = setupContext( conf.getChild( "context" ) );


        setupManagers( conf.getChild( "components" ),
                       conf.getChild( "roles" ),
                       conf.getChild( "logkit" ),
                       context );

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        }


        final DefaultConfigurationBuilder builder = new DefaultConfigurationBuilder();
        final Configuration conf = builder.build(testconf);


        Context context = this.setupContext(conf.getChild("context"));


        setupManagers(conf.getChild("components"),
                      conf.getChild("roles"),
                      context);
    }

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     * Get the Context object
     */
    public void contextualize( Context context )
        throws ContextException
    {
        Context currentContext = context;
        
        try {
            String projectHome = ForrestConfUtils.getProjectHome();


            if(!projectHome.startsWith(ForrestConfUtils.defaultHome)){

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        request.setAttribute(FlowHelper.CONTEXT_OBJECT, flowContextObject);
        Map objectModel = new HashMap();
        objectModel.put(ObjectModelHelper.REQUEST_OBJECT, request);
        Map contextObjectModel = new HashMap();
        contextObjectModel.put(ContextHelper.CONTEXT_OBJECT_MODEL, objectModel);
        Context context = new DefaultContext(contextObjectModel);
        Source sampleSource = new ResourceSource("resource://org/apache/cocoon/woody/datatype/FlowJXPathSelectionListTestCase.source.xml");
        Document sample = parser.parse(sampleSource.getInputStream());
        Element datatypeElement = (Element) sample.getElementsByTagNameNS(Constants.WD_NS, "datatype").item(0);
        Datatype datatype = datatypeManager.createDatatype(datatypeElement, false);
        FlowJXPathSelectionList list = new FlowJXPathSelectionList

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        Creator testCreator = new TestCreator(1);
        m_manager.addCreatorExtension( testCreator );
        m_manager.addAccessorExtension( testAccessor );


        TestComponent component = new TestComponent();
        Context context = new DefaultContext();
        m_manager.executeCreationExtensions( component, context );
        m_manager.executeAccessExtensions( component, context );
        m_manager.executeReleaseExtensions( component, context );
        m_manager.executeDestructionExtensions( component, context );
    }

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        m_manager.initialize();
    }


    public void testContextManager() throws Exception
    {
        final Context managerContext = m_manager.getContainerManagerContext();
        assertNotNull( managerContext );


        final ServiceManager serviceManager = (ServiceManager) managerContext.get( SERVICE_MANAGER );
        assertNotNull( serviceManager );


        final InstrumentManager instrumentManager =
                (InstrumentManager) serviceManager.lookup( InstrumentManager.ROLE );
        assertNotNull( instrumentManager );

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        this.itsContainer = SitemapHelper.createContainer(
                                               tree,
                                               location,
                                               fam,
                                               (ServletContext)this.context.get(Constants.CONTEXT_ENVIRONMENT_CONTEXT));
        final Context itsContext = (Context)this.itsContainer.getBean(AvalonUtils.CONTEXT_ROLE);
        // The namespace used in the whole sitemap is the one of the root
        // element
        this.itsNamespace = tree.getNamespace();


        // replace properties?

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     * Get the Context object
     */
    public void contextualize( Context context )
        throws ContextException
    {
        Context currentContext = context;
        
        try {
            String projectHome = ForrestConfUtils.getProjectHome();


            if(!projectHome.startsWith(ForrestConfUtils.defaultHome)){

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     * Get the Context object
     */
    public void contextualize( Context context )
        throws ContextException
    {
        Context currentContext = context;
        
        try {
            String projectHome = ForrestConfUtils.getProjectHome();
            if(!projectHome.equals(ForrestConfUtils.defaultHome)){
                DefaultContext newContext = new DefaultContext(context);

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Examples of org.apache.avalon.framework.context.Context

Examples, where the data is specified in a sample XML format:

Example 1: Specification of Canonical Key

Example 2: Specification of Canonical Key With Aliasing

Related Classes of org.apache.avalon.framework.context.Context