Examples of org.apache.velocity.context.EvaluateContext

org.apache.velocity.context.EvaluateContext
This is a special, internal-use-only context implementation to be used for the #evaluate directive. We use this context to chain the existing context, preventing any changes from impacting the parent context. By separating this context into a separate class it also allows for the future possibility of changing the context behavior for the #evaluate directive. Note that the context used to store values local to #evaluate() is user defined but defaults to {@link VelocityContext}. @author Will Glass-Husain @version $Id: EvaluateContext.java 898032 2010-01-11 19:51:03Z nbubna $ @since 1.6 @deprecated Will be removed in 2.0

         * to prevent any changes to the current context.
         */


        if (nodeTree != null)
        {
            InternalContextAdapter ica = new EvaluateContext(context, rsvc);


            ica.pushCurrentTemplateName( templateName );


            try
            {
                try
                {
                    nodeTree.init( ica, rsvc );
                }
                catch (TemplateInitException pex)
                {
                    Info info = new Info( templateName, node.getLine(), node.getColumn() );
                    throw  new ParseErrorException( pex.getMessage(), info );
                }


                try 
                {
                    preRender(ica);


                    /*
                     *  now render, and let any exceptions fly
                     */
                    nodeTree.render( ica, writer );
                }
                catch (StopCommand stop)
                {
                    if (!stop.isFor(this))
                    {
                        throw stop;
                    }
                    else if (rsvc.getLog().isDebugEnabled())
                    {
                        rsvc.getLog().debug(stop.getMessage());
                    }
                }
                catch (ParseErrorException pex)
                {
                    // convert any parsing errors to the correct line/col
                    Info info = new Info( templateName, node.getLine(), node.getColumn() );
                    throw  new ParseErrorException( pex.getMessage(), info );
                }
            }
            finally
            {
                ica.popCurrentTemplateName();
                postRender(ica);
            }
            return true;
        }

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        instance.init();


        VelocityContext base = new VelocityContext();
        base.put("outsideVar", "value1");


        EvaluateContext evc = new EvaluateContext(new InternalContextAdapterImpl(base), instance);
        evc.put("newLocalVar", "value2");


        // New variable put doesn't leak
        assertNull(base.get("newLocalVar"));
        assertEquals("value2", evc.get("newLocalVar"));


        // But we can still get to "outsideVar"
        assertEquals("value1", evc.get("outsideVar"));


        // If we decide to try and set outsideVar it won't leak
        evc.put("outsideVar", "value3");
        assertEquals("value3", evc.get("outsideVar"));
        assertEquals("value1", base.get("outsideVar"));
        
        assertEquals(2, evc.getKeys().length);
    }

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        instance.setProperty(RuntimeConstants.EVALUATE_CONTEXT_CLASS, TestContext.class.getName());
        instance.init();


        VelocityContext base = new VelocityContext();
        base.put("outsideVar", "value1");
        EvaluateContext evc = new EvaluateContext(new InternalContextAdapterImpl(base), instance);


        // original entry
        assertEquals(1,evc.getKeys().length);
        
        // original plus local entry
        evc.put("test","result");
        assertEquals(2,evc.getKeys().length);
        
        // local context is case insensitive, so the count remains the same
        evc.put("TEST","result");
        assertEquals(2,evc.getKeys().length);


        assertEquals("result",evc.get("test"));
        assertEquals("result",evc.get("TEst"));
    
        assertNull(evc.get("OUTSIDEVAR"));
    }

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        {
            // initialize with bad class name
            RuntimeInstance instance = new RuntimeInstance();
            instance.setProperty(RuntimeConstants.EVALUATE_CONTEXT_CLASS, "org.apache");
            instance.init();
            EvaluateContext evc = new EvaluateContext(new InternalContextAdapterImpl(base), instance);
            fail ("Expected an exception");
        }
        catch (Exception e) {}
        
        try 
        {
            // initialize with class not implementing Context
            RuntimeInstance instance = new RuntimeInstance();
            instance.setProperty(RuntimeConstants.EVALUATE_CONTEXT_CLASS, org.apache.velocity.test.EvaluateContextTestCase.class.getName());
            instance.init();
            EvaluateContext evc = new EvaluateContext(new InternalContextAdapterImpl(base), instance);
            fail ("Expected an exception");
        }
        catch (Exception e) {}
    }

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        instance.init();


        VelocityContext base = new VelocityContext();
        base.put("outsideVar", "value1");


        EvaluateContext evc = new EvaluateContext(new InternalContextAdapterImpl(base), instance);
        evc.put("newLocalVar", "value2");


        // New variable put doesn't leak
        assertNull(base.get("newLocalVar"));
        assertEquals("value2", evc.get("newLocalVar"));


        // But we can still get to "outsideVar"
        assertEquals("value1", evc.get("outsideVar"));


        // If we decide to try and set outsideVar it won't leak
        evc.put("outsideVar", "value3");
        assertEquals("value3", evc.get("outsideVar"));
        assertEquals("value1", base.get("outsideVar"));
        
        assertEquals(2, evc.getKeys().length);
    }

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        instance.setProperty(RuntimeConstants.EVALUATE_CONTEXT_CLASS, TestContext.class.getName());
        instance.init();


        VelocityContext base = new VelocityContext();
        base.put("outsideVar", "value1");
        EvaluateContext evc = new EvaluateContext(new InternalContextAdapterImpl(base), instance);


        // original entry
        assertEquals(1,evc.getKeys().length);
        
        // original plus local entry
        evc.put("test","result");
        assertEquals(2,evc.getKeys().length);
        
        // local context is case insensitive, so the count remains the same
        evc.put("TEST","result");
        assertEquals(2,evc.getKeys().length);


        assertEquals("result",evc.get("test"));
        assertEquals("result",evc.get("TEst"));
    
        assertNull(evc.get("OUTSIDEVAR"));
    }

View Full Code Here

        {
            // initialize with bad class name
            RuntimeInstance instance = new RuntimeInstance();
            instance.setProperty(RuntimeConstants.EVALUATE_CONTEXT_CLASS, "org.apache");
            instance.init();
            EvaluateContext evc = new EvaluateContext(new InternalContextAdapterImpl(base), instance);
            fail ("Expected an exception");
        }
        catch (Exception e) {}
        
        try 
        {
            // initialize with class not implementing Context
            RuntimeInstance instance = new RuntimeInstance();
            instance.setProperty(RuntimeConstants.EVALUATE_CONTEXT_CLASS, org.apache.velocity.test.EvaluateContextTestCase.class.getName());
            instance.init();
            EvaluateContext evc = new EvaluateContext(new InternalContextAdapterImpl(base), instance);
            fail ("Expected an exception");
        }
        catch (Exception e) {}
    }

View Full Code Here

         * to prevent any changes to the current context.
         */


        if (nodeTree != null)
        {
            InternalContextAdapter ica = new EvaluateContext(context, rsvc);


            ica.pushCurrentTemplateName( templateName );


            try
            {
                try
                {
                    nodeTree.init( ica, rsvc );
                }
                catch (TemplateInitException pex)
                {
                    Info info = new Info( templateName, node.getLine(), node.getColumn() );
                    throw  new ParseErrorException( pex.getMessage(), info );
                }


                try 
                {
                    /*
                     *  now render, and let any exceptions fly
                     */
                    nodeTree.render( ica, writer );
                }
                catch (ParseErrorException pex)
                {
                    // convert any parsing errors to the correct line/col
                    Info info = new Info( templateName, node.getLine(), node.getColumn() );
                    throw  new ParseErrorException( pex.getMessage(), info );
                }
            }
            finally
            {
                ica.popCurrentTemplateName();
            }


            return true;
        }

View Full Code Here

         */


        if (nodeTree != null)
        {
            InternalContextAdapterImpl ica =
                new InternalContextAdapterImpl( new EvaluateContext(context, rsvc) );


            ica.pushCurrentTemplateName( templateName );


            try
            {

View Full Code Here

         * to prevent any changes to the current context.
         */
        
        if (nodeTree != null)
        {
            InternalContextAdapter ica = new EvaluateContext(context, rsvc);


            ica.pushCurrentTemplateName( templateName );


            try
            {
                try
                {
                    nodeTree.init( ica, rsvc );
                }
                catch (TemplateInitException pex)
                {
                    Info info = new Info( templateName, node.getLine(), node.getColumn() );
                    throw  new ParseErrorException( pex.getMessage(), info );
                }


                try 
                {
                    preRender(ica);


                    /*
                     *  now render, and let any exceptions fly
                     */
                    nodeTree.render( ica, writer );
                }
                catch (StopCommand stop)
                {
                    if (!stop.isFor(this))
                    {
                        throw stop;
                    }
                    else if (Logger.isDebugEnabled(this.getClass()))
                    {
                        Logger.debug(this,stop.getMessage());
                    }
                }
                catch (ParseErrorException pex)
                {
                    // convert any parsing errors to the correct line/col
                    Info info = new Info( templateName, node.getLine(), node.getColumn() );
                    throw  new ParseErrorException( pex.getMessage(), info );
                }
            }
            finally
            {
                ica.popCurrentTemplateName();
                postRender(ica);
            }
            return true;
        }

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