Examples of org.apache.cocoon.components.flow.Interpreter

Package org.apache.cocoon.components.flow

Examples of org.apache.cocoon.components.flow.Interpreter

org.apache.cocoon.components.flow.Interpreter
The interface to the flow scripting languages. This interface is for a component, which implements the appropriate language to be used for describing the flow. A system could have multiple components that implement this interface, each of them for a different scripting language.
A flow script defines what is the page flow in an interactive Web application. Usually the flow is defined in a high level programming language which provides the notion of continuations, which allows for the flow of the application to be described as a simple procedural program, without having to think about the application as a finite state machine which changes its internal state on each HTTP request from the client browser.
However an implementation may choose to use its own representation of an application, which may include XML representations of finite state machines. Note: this API has no provision for such implementations.
The component represented by this interface is called in three situations:
- From the sitemap, to invoke a top level function defined in a * given implementation language of the flow. This is done from the * sitemap using the construction:
```
 <map:call function="..." language="..."/> 
```
  The language attribute can be ignored if the default language is used.
- From the sitemap, to continue a previously started computation. A previously started computation is saved in the form of a continuation inside the flow implementation language.
  This case is similar with the above one, but the function invoked has a special name, specific to each language implementation. See the language implementation for more information on the function name and the arguments it receives.
- From a program in the flow layer. This is done to invoke a pipeline defined in the sitemap, to generate the response of the request.
@author Ovidiu Predescu @since March 11, 2002 @see InterpreterSelector @version CVS $Id: Interpreter.java,v 1.2 2003/03/16 17:49:11 vgritsenko Exp $

        if (flow == null)
            throw new ConfigurationException("This sitemap contains no control flows defined, cannot call at " + node.getLocation() + ". Define a control flow using <map:flow>, with embedded <map:script> elements.");


        // Get the Interpreter instance and set it up in the
        // CallFunctionNode function
        Interpreter interpreter = flow.getInterpreter();
        ((CallFunctionNode)node).setInterpreter(interpreter);
      }
    }

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        // continuation object? Use the default language for now, but it
        // should be fixed ASAP.
        String language = selector.getDefaultLanguage();


        // Obtain the Interpreter instance for this language
        Interpreter interpreter = (Interpreter)selector.select(language);


        // Obtain the redirector
        // Redirector redirector = PipelinesNode.getRedirector(env);


        try {
            interpreter.handleContinuation(contId, params, env /*, redirector*/);
        } finally {
            selector.release((Component)interpreter);
        }


        return true;

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                    + ". Define a control flow using <map:flow>, with embedded <map:script> elements.");
            }


            // Get the Interpreter instance and set it up in the
            // CallFunctionNode function
            Interpreter interpreter = flow.getInterpreter();
            ((CallFunctionNode) node).setInterpreter(interpreter);
        }
    }

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                }


                // Get the actual interpreter
                FlowNode flowNode = (FlowNode)treeBuilder.getRegisteredNode("flow");
                if ( flowNode != null ) {
                    final Interpreter interpreter = flowNode.getInterpreter();
                    newProcessor.setAttribute(Interpreter.ROLE, interpreter);
                }
                
            } finally {
                this.manager.release(treeBuilder);

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     * flow interpreter.
     */
    public void linkNode()
    throws Exception {
        FlowNode flowNode = (FlowNode)this.treeBuilder.getRegisteredNode("flow");
        Interpreter interpreter = flowNode.getInterpreter();


        this.node.registerScriptWithInterpreter(interpreter);
    }

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    public String callFunction(String type, String source, String function, Map params) throws Exception {
        
        redirector.reset();
        
        ServiceSelector selector = null;
        Interpreter interpreter = null;
        SourceResolver resolver = null;


        try {
            selector = (ServiceSelector) this.lookup(Interpreter.ROLE);
            assertNotNull("Test lookup of interpreter selector", selector);


            resolver = (SourceResolver) this.lookup(SourceResolver.ROLE);
            assertNotNull("Test lookup of source resolver", resolver);


            assertNotNull("Test if interpreter name is not null", type);
            interpreter = (Interpreter) selector.select(type);
            assertNotNull("Test lookup of interpreter", interpreter);
            
            ((AbstractInterpreter)interpreter).register(source);
            
            ArrayList parameters = new ArrayList();
            for (Iterator i = params.entrySet().iterator(); i.hasNext();) {
                Map.Entry me = (Map.Entry)i.next();
                String name = (String)me.getKey();
                String value = (String)me.getValue();
                parameters.add(new Interpreter.Argument(name, value));
            }
            interpreter.callFunction(function, parameters, getRedirector());
            
        } catch (ServiceException ce) {
            getLogger().error("Could not retrieve interpeter", ce);
            fail("Could not retrieve interpreter: " + ce.toString());
        } finally {

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    public String callContinuation(String type, String source, String id, Map params) throws Exception {
        
        redirector.reset();
        
        ServiceSelector selector = null;
        Interpreter interpreter = null;
        SourceResolver resolver = null;


        try {
            selector = (ServiceSelector) this.lookup(Interpreter.ROLE);
            assertNotNull("Test lookup of interpreter selector", selector);


            resolver = (SourceResolver) this.lookup(SourceResolver.ROLE);
            assertNotNull("Test lookup of source resolver", resolver);


            assertNotNull("Test if interpreter name is not null", type);
            interpreter = (Interpreter) selector.select(type);
            assertNotNull("Test lookup of interpreter", interpreter);


            ((AbstractInterpreter)interpreter).register(source);
            
            ArrayList parameters = new ArrayList();
            for (Iterator i = params.entrySet().iterator(); i.hasNext();) {
                Map.Entry me = (Map.Entry)i.next();
                String name = (String)me.getKey();
                String value = (String)me.getValue();
                parameters.add(new Interpreter.Argument(name, value));
            }
            interpreter.handleContinuation(id, parameters, getRedirector());


        } catch (ServiceException ce) {
            getLogger().error("Could not retrieve interpreter", ce);
            fail("Could not retrieve interpreter: " + ce.toString());
        } finally {

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   */
  public void linkNode()
    throws Exception
  {
    FlowNode flowNode = (FlowNode)this.treeBuilder.getRegisteredNode("flow");
    Interpreter interpreter = flowNode.getInterpreter();


    this.node.registerScriptWithInterpreter(interpreter);
  }

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    try {
      ComponentSelector selector
        = (ComponentSelector)manager.lookup(Interpreter.ROLE);
      // Obtain the Interpreter instance for this language
      Interpreter interpreter = (Interpreter)selector.select(language);
      if (interpreter instanceof AbstractInterpreter)
        ((AbstractInterpreter)interpreter).register(source);
      // else FIXME: what to do if interpreter doesn't inherit from
      // AbstractInterpreter
    }

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    // continuation object? Use the default language for now, but it
    // should be fixed ASAP.
    String language = selector.getDefaultLanguage();


    // Obtain the Interpreter instance for this language
    Interpreter interpreter = (Interpreter)selector.select(language);


    try {
      interpreter.handleContinuation(contId, env, context);
    }
    finally {
      selector.release((Component)interpreter);
    }

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org.apache.cocoon.components.treeprocessor.sitemap.CallFunctionNode

org.apache.cocoon.components.treeprocessor.sitemap.CallNodeBuilder

org.apache.cocoon.components.treeprocessor.sitemap.ContinueNode

org.apache.cocoon.components.treeprocessor.sitemap.ScriptNode

org.apache.cocoon.components.treeprocessor.sitemap.ScriptNodeBuilder

org.apache.cocoon.components.treeprocessor.TreeProcessor

org.apache.cocoon.SitemapComponentTestCase

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