[jira] [Created] (VELOCITY-881) Even handler didn't work when the reference appear in #if statement

["pixiang.lq (JIRA)" <ji...@apache.org>]

pixiang.lq created VELOCITY-881:
-----------------------------------

             Summary: Even handler didn't work when the reference appear in #if statement
                 Key: VELOCITY-881
                 URL: https://issues.apache.org/jira/browse/VELOCITY-881
             Project: Velocity
          Issue Type: Bug
          Components: Engine
    Affects Versions: 1.7
         Environment: it a common case. It nothing to do with a specified environment
            Reporter: pixiang.lq
             Fix For: 2.0


My code like:
----------------------------------------------------------------
public static void main(String[] args) {

        VelocityEngine ve = new VelocityEngine();
        ve.setProperty(Velocity.RESOURCE_LOADER, "class");
        ve.setProperty("class.resource.loader.class",
                "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");
        try {
            ve.init();
            Template tp = ve.getTemplate("my-template.xml");

            Context context = new VelocityContext();

            // add my event handler
            Map map = new HashMap<>();
            map.put("deploy.domain", "offline");
            map.put("deploy_domain", "offline");
            map.put("provider.version", "1.0.0");
            map.put("provider_version", "1.0.0");

            EventCartridge eventCartridge = new EventCartridge();
            eventCartridge.addEventHandler(new MyReferenceInsertionHandler(map));
            eventCartridge.attachToContext(context);

            StringWriter writer = new StringWriter();

            tp.merge(context, writer);
            System.out.println(writer.toString());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
----------------------------------------------------------------

My template file to be converted by velocity like:
----------------------------------------------------------------

#if(${deploy.domain}=='testString')
	<bean class="MY_CLASS1">
		<property name="MY_PROPERTY_NAME1">
			<value>aaa</value>
		</property>
	</bean>
#end 

<bean class="MY_CLASS2">
	<property name="MY_PROPERTY_NAME2">
		<value>${provider.version}</value>
	</property>
</bean>

----------------------------------------------

My got the output in fact:
----------------------------------------------

<bean class="MY_CLASS2">
<property name="MY_PROPERTY_NAME2">
	<value>1.0.0</value>
</property>
</bean>
----------------------------------------------

My expected output:
----------------------------------------------
<bean class="MY_CLASS1">
	<property name="MY_PROPERTY1">
		<value>aaa</value>
	</property>
</bean>

<bean class="MY_CLASS2">
<property name="MY_PROPERTY_NAME2">
	<value>1.0.0</value>
</property>
</bean>
----------------------------------------------

My suggestion to fix this bug:

ASTReference.java
----------------------------------------------
The method before change:
public Object value(InternalContextAdapter context)
        throws MethodInvocationException
    {
        return (computableReference ? execute(null, context) : null);
    }

After change:
public Object value(InternalContextAdapter context)
        throws MethodInvocationException
    {
        Object value = this.computableReference?this.execute((Object)null, context):null;
        if(value == null && !this.escaped) {
            // process the value by EventHandlerUtil
            value = EventHandlerUtil.referenceInsert(this.rsvc, context, this.literal, value);
        }
        return value;
    }
----------------------------------------------




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