Examples of org.apache.commons.chain.Command

org.apache.commons.chain.Command
A {@link Command} encapsulates a unit of processing work to beperformed, whose purpose is to examine and/or modify the state of a transaction that is represented by a {@link Context}. Individual {@link Command}s can be assembled into a {@link Chain}, which allows them to either complete the required processing or delegate further processing to the next {@link Command} in the {@link Chain}.

{@link Command} implementations should be designed in a thread-safemanner, suitable for inclusion in multiple {@link Chain}s that might be processed by different threads simultaneously. In general, this implies that {@link Command} classes should not maintain state information ininstance variables. Instead, state information should be maintained via suitable modifications to the attributes of the {@link Context} that ispassed to the execute() command.

{@link Command} implementations typically retrieve and store stateinformation in the {@link Context} instance that is passed as a parameterto the execute() method, using particular keys into the Map that can be acquired via Context.getAttributes(). To improve interoperability of {@link Command} implementations, a useful design pattern is to expose thekey values used as JavaBeans properties of the {@link Command}implementation class itself. For example, a {@link Command} that requiresan input and an output key might implement the following properties:
```
 private String inputKey = "input"; public String getInputKey() { return (this.inputKey); } public void setInputKey(String inputKey) { this.inputKey = inputKey; } private String outputKey = "output"; public String getOutputKey() { return (this.outputKey); } public void setOutputKey(String outputKey) { this.outputKey = outputKey; } 
```
And the operation of accessing the "input" information in the context would be executed by calling:
```
 String input = (String) context.get(getInputKey()); 
```
instead of hard coding the attribute name. The use of the "Key" suffix on such property names is a useful convention to identify properties being used in this fashion, as opposed to JavaBeans properties that simply configure the internal operation of this {@link Command}.
@author Craig R. McClanahan @version $Revision: 1.5 $ $Date: 2004/02/25 00:01:07 $

                    ClayContext subContext = (ClayContext) clayContext.clone();
                    subContext.setDisplayElement(valueChangeListener);
                    subContext.setParent(child);


                    Catalog catalog = getCatalog();
                    Command command = catalog
                            .getCommand(Globals.ADD_VALUE_CHANGE_LISTENER_COMMAND_NAME);
                    command.execute(subContext);


                }
            } else {
                log.error(getMessages().getMessage(
                        "assign.valueChangeListener.error",

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       clayContext.setFacesContext(facesContext);
       clayContext.setChild(child);
       clayContext.setAttribute(attr);
       clayContext.setDisplayElement(displayElement);
              
       Command command = new PropertyValueCommand();
       boolean isFinal = command.execute(clayContext);
       assertEquals("command finished", true, isFinal);       
       assertEquals("value = 10", child.getValue(), "10");


       
       child = (javax.faces.component.html.HtmlOutputText) 
                               facesContext.getApplication().createComponent("javax.faces.HtmlOutputText"); 
       assertNotNull("javax.faces.HtmlOutputText", child);
       clayContext.setChild(child);
       
       servletContext.setAttribute("goodYear", "1969");
       attr.setBindingType(AttributeBean.BINDING_TYPE_VALUE);
       attr.setValue("#{goodYear}");


       isFinal = command.execute(clayContext);
       assertEquals("command finished", true, isFinal);       
       assertEquals("value = 1969", "1969", child.getValue());
       
       child = (javax.faces.component.html.HtmlOutputText) 
                             facesContext.getApplication().createComponent("javax.faces.HtmlOutputText"); 
       assertNotNull("javax.faces.HtmlOutputText", child);
       clayContext.setChild(child);
       
       servletContext.setAttribute("ping", "pong");
       attr.setBindingType(AttributeBean.BINDING_TYPE_EARLY);
       attr.setValue("#{ping}");


       isFinal = command.execute(clayContext);
       assertEquals("command finished", true, isFinal);       
       assertEquals("value = pong", child.getValue(), "pong");




       child = (javax.faces.component.html.HtmlOutputText) 
                               facesContext.getApplication().createComponent("javax.faces.HtmlOutputText"); 
       assertNotNull("javax.faces.HtmlOutputText", child);
       clayContext.setChild(child);
       
       attr.setBindingType(AttributeBean.BINDING_TYPE_NONE);
       attr.setValue("#{forManfred}");


       isFinal = command.execute(clayContext);
       assertEquals("command finished", true, isFinal);       
       assertEquals("value = #{forManfred}", "#{forManfred}", child.getValue());


        
    }

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           clayContext.setChild(child);
           clayContext.setAttribute(attr);
           clayContext.setDisplayElement(displayElement);
           clayContext.setSymbols(displayElement.getSymbols());
           
           Command command = new PropertyValueCommand();
           boolean isFinal = command.execute(clayContext);
           assertEquals("command finished", true, isFinal);       
           assertEquals("value = 10", "10", child.getValue());


           
           // test a symbol value of an el value
           child = (javax.faces.component.html.HtmlOutputText) 
                        facesContext.getApplication().createComponent("javax.faces.HtmlOutputText"); 
           assertNotNull("javax.faces.HtmlOutputText", child);


           displayElement.addSymbol(createSymbol("@value", "#{value}"));
           attr.setBindingType(AttributeBean.BINDING_TYPE_EARLY);
           servletContext.setAttribute("value", "10");
          
           clayContext.setFacesContext(facesContext);
           clayContext.setChild(child);
           clayContext.setAttribute(attr);
           clayContext.setDisplayElement(displayElement);
           clayContext.setSymbols(displayElement.getSymbols());
           
           isFinal = command.execute(clayContext);
           assertEquals("command finished", true, isFinal);       
           assertEquals("value = 10", "10", child.getValue());


           
           // test a symbol value with a null value symbol replacement
           child = (javax.faces.component.html.HtmlOutputText) 
                 facesContext.getApplication().createComponent("javax.faces.HtmlOutputText"); 
           assertNotNull("javax.faces.HtmlOutputText", child);


           displayElement.addSymbol(createSymbol("@value", null));
           attr.setBindingType(AttributeBean.BINDING_TYPE_EARLY);
          
           clayContext.setFacesContext(facesContext);
           clayContext.setChild(child);
           clayContext.setAttribute(attr);
           clayContext.setDisplayElement(displayElement);
           clayContext.setSymbols(displayElement.getSymbols());
           
           isFinal = command.execute(clayContext);
           assertEquals("command finished", true, isFinal);       
           assertEquals("value = null", null, child.getValue());




           // test a symbol value with an empty String value.  
           // this will evaluate to null since it is a symbol replacement.
           child = (javax.faces.component.html.HtmlOutputText) 
                     facesContext.getApplication().createComponent("javax.faces.HtmlOutputText"); 
           assertNotNull("javax.faces.HtmlOutputText", child);


           displayElement.addSymbol(createSymbol("@value", ""));
           attr.setBindingType(AttributeBean.BINDING_TYPE_EARLY);
          
           clayContext.setFacesContext(facesContext);
           clayContext.setChild(child);
           clayContext.setAttribute(attr);
           clayContext.setDisplayElement(displayElement);
           clayContext.setSymbols(displayElement.getSymbols());
           
           isFinal = command.execute(clayContext);
           assertEquals("command finished", true, isFinal);       
           assertEquals("value = null", null, child.getValue());


           //no symbol replacement for a empty string - should return
           //an empty string.  This allows components like the selectItem
           //to create an empty select list pick.
           attr.setValue("");  //empty string           
           child = (javax.faces.component.html.HtmlOutputText) 
                        facesContext.getApplication().createComponent("javax.faces.HtmlOutputText"); 
           assertNotNull("javax.faces.HtmlOutputText", child);


           clayContext.setFacesContext(facesContext);
           clayContext.setChild(child);
           clayContext.setAttribute(attr);
           clayContext.setDisplayElement(displayElement);
           
           isFinal = command.execute(clayContext);
           assertEquals("command finished", true, isFinal);       
           assertEquals("value = \"\"", "", child.getValue());


           //Case insensitive and reoccurring replacement
           attr.setValue("@TeSt1, @tEst1 never @test2; @test1, @teSt1 till ya @tesT3");  //test multiple symbols           
           child = (javax.faces.component.html.HtmlOutputText) 
                     facesContext.getApplication().createComponent("javax.faces.HtmlOutputText"); 
           assertNotNull("javax.faces.HtmlOutputText", child);


           displayElement.addSymbol(createSymbol("@test1", "rock"));
           displayElement.addSymbol(createSymbol("@test2", "stop"));
           displayElement.addSymbol(createSymbol("@test3", "drop"));


           clayContext.setFacesContext(facesContext);
           clayContext.setChild(child);
           clayContext.setAttribute(attr);
           clayContext.setDisplayElement(displayElement);
           // normally done in the AssignChildrenCommand
           clayContext.setSymbols(displayElement.getSymbols());
           
           isFinal = command.execute(clayContext);
           assertEquals("command finished", true, isFinal);       
           assertEquals("value = \"rock, rock never stop; rock, rock till ya drop\"", 
                   "rock, rock never stop; rock, rock till ya drop", child.getValue());


    }

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        clayContext.setParent(parent);
        clayContext.setDisplayElement(displayElement);
        clayContext.setSymbols(displayElement.getSymbols());
        clayContext.setJspIds(new TreeSet());
                
        Command command = new CreateComponentCommand();
        boolean isFinal = command.execute(clayContext);
        assertEquals("command finished", false, isFinal);
        
        UIComponent child = (UIComponent) clayContext.getChild();
        assertNotNull("child", child);
        
        assertEquals("id = test", "test", child.getId());
        
        
        //null component id symbol replacement
        parent = (UIComponent) 
             facesContext.getApplication().createComponent("javax.faces.NamingContainer"); 
        assertNotNull("javax.faces.NamingContainer", parent);
        parent.setId("parent");
        
        displayElement = new ComponentBean();
        displayElement.setJsfid("inputText");
        displayElement.setComponentType("javax.faces.HtmlOutputText");
        displayElement.setId("@wynn");
        displayElement.addSymbol(createSymbol("@wynn", null));
        
        clayContext = new ClayContext();
        clayContext.setFacesContext(facesContext);
        clayContext.setParent(parent);
        clayContext.setDisplayElement(displayElement);
        clayContext.setSymbols(displayElement.getSymbols());
        clayContext.setJspIds(new TreeSet());
                
        command = new CreateComponentCommand();
        try {
            isFinal = command.execute(clayContext);
            assertTrue("id replacement failed", false);
        } catch (RuntimeException e) {
            assertTrue("null component id", 
                    e.getMessage().startsWith("The component symbol substitution failed for id \"@wynn\""));    
        }
        
        //missing component id symbol replacement
        parent = (UIComponent) 
             facesContext.getApplication().createComponent("javax.faces.NamingContainer"); 
        assertNotNull("javax.faces.NamingContainer", parent);
        parent.setId("parent");
        
        displayElement = new ComponentBean();
        displayElement.setJsfid("inputText");
        displayElement.setComponentType("javax.faces.HtmlOutputText");
        displayElement.setId("@wynn");
        
        clayContext = new ClayContext();
        clayContext.setFacesContext(facesContext);
        clayContext.setParent(parent);
        clayContext.setDisplayElement(displayElement);
        clayContext.setSymbols(displayElement.getSymbols());
        clayContext.setJspIds(new TreeSet());
                
        command = new CreateComponentCommand();
        try {
            isFinal = command.execute(clayContext);
            assertTrue("id replacement failed", false);
        } catch (RuntimeException e) {
            assertTrue("missing component id", 
                    e.getMessage().startsWith("The component symbol substitution failed for id \"@wynn\""));    
        }

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        clayContext.setAttribute(attr);
        clayContext.setDisplayElement(displayElement);
        // normally done in the AssignChildrenCommand
        clayContext.setSymbols(displayElement.getSymbols());
                
        Command command = new PropertyValueCommand();
        boolean isFinal = command.execute(clayContext);
        assertEquals("command finished", true, isFinal);       
        assertEquals("value = 6743", "6743", child.getValue());      


    
        //create a target component
        child = (javax.faces.component.html.HtmlOutputText) 
                           facesContext.getApplication().createComponent("javax.faces.HtmlOutputText"); 
        assertNotNull("javax.faces.HtmlOutputText", child);


        attr.setValue("@{a}@{ab}");  //symbolic attribute 
        displayElement.addSymbol(createSymbol("@{ab}", "43"));
        displayElement.addSymbol(createSymbol("@{a}", "67"));


        clayContext.setChild(child);


        isFinal = command.execute(clayContext);
        assertEquals("command finished", true, isFinal);       
        assertEquals("value = 6743", "6743", child.getValue());      




        
        //create a target component
        child = (javax.faces.component.html.HtmlOutputText) 
                           facesContext.getApplication().createComponent("javax.faces.HtmlOutputText"); 
        assertNotNull("javax.faces.HtmlOutputText", child);


        attr.setValue("@(a)@(ab)");  //symbolic attribute 
        displayElement.addSymbol(createSymbol("@(ab)", "43"));
        displayElement.addSymbol(createSymbol("@(a)", "67"));


        clayContext.setChild(child);


        isFinal = command.execute(clayContext);
        assertEquals("command finished", true, isFinal);       
        assertEquals("value = 6743", "6743", child.getValue());      
        
        
    }

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                    ClayContext subContext = (ClayContext) clayContext.clone();
                    subContext.setDisplayElement(actionListener);
                    subContext.setParent(child);


                    Catalog catalog = getCatalog();
                    Command command = catalog
                            .getCommand(Globals.ADD_ACTION_LISTENER_COMMAND_NAME);
                    command.execute(subContext);


                }
            } else {
                log.error(getMessages().getMessage("assign.action.listener.error",
                        new Object[] { displayElement }));

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            subContext.setChild(null);
            subContext.setChildIndex(childIndex);
            subContext.setJspIds(clayContext.getJspIds());


            Catalog catalog = getCatalog();
            Command command = catalog
                    .getCommand(Globals.ADD_COMPONENT_COMMAND_NAME);
            command.execute(subContext);


            UIComponent child = (UIComponent) subContext.getChild();


            // Increment the index if the new component is not a facet
            if (parent.getChildren().contains(child)) {

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        Iterator ai = displayElement.getAttributeIterator();
        Catalog defaultCatalog = getCatalog();
        Catalog customizationCatalog = getCustomizationCatalog();


        Command defaultCommand = defaultCatalog.getCommand(Globals.SET_ATTRIBUTE_COMMAND_NAME);
        next: while (ai.hasNext()) {
            AttributeBean a = (AttributeBean) ai.next();
            if (a.getValue() == null) {
               continue next;
            }


            Command command = null;
            //look for a command override in the customization catalog first
            if (customizationCatalog != null) {
                command = customizationCatalog.getCommand(a.getName());
            }
            //look for a command override in the defaut catalog
            if (command == null) {
               command = defaultCatalog.getCommand(a.getName());
            }
            //use the default command
            if (command == null) {
               command = defaultCommand;
            }


            clayContext.setAttribute(a);


            try {
                command.execute(clayContext);
            } catch (Exception e) {
                log.error(getMessages().getMessage("assign.property.error",
                        new Object[] { a }), e);
                        throw e;

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                    ClayContext subContext = (ClayContext) clayContext.clone();
                    subContext.setDisplayElement(validator);
                    subContext.setParent(child);


                    Catalog catalog = getCatalog();
                    Command command = catalog
                            .getCommand(Globals.ADD_VALIDATOR_COMMAND_NAME);
                    command.execute(subContext);


                }
            } else {
                log.error(getMessages().getMessage("assign.validator.error",
                        new Object[] { displayElement }));

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                ClayContext subContext = (ClayContext) clayContext.clone();
                subContext.setDisplayElement(displayElement.getConverter());
                subContext.setParent(child);


                Catalog catalog = getCatalog();
                Command command = catalog
                        .getCommand(Globals.ADD_CONVERTER_COMMAND_NAME);
                command.execute(subContext);


            } else {
                log.error(getMessages().getMessage("assign.converter.error",
                        new Object[] { displayElement }));
            }

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