The following code does not work because Freemarker seems to cast the value of the expression inside [] to String and then to use it as a key, which is not what is actually expected.
Preparing a template model:
Map<MyEnum, Object> myMap;
myMap.put(MyEnum.FOO, "Foo");
myMap.put(MyEnum.BAR, "Bar");
templateModel.put("myMap", myMap);
my.ftl:
<#list myMap?keys as key>
<#assign value = myMap[key]>
<li>${key} = ${value}</li>
</#list>
In the Freemarker documentation it is described how to access the Enum itself, but I didn't find anything about how to get a value from a hash using Enum as a key.
Thank you.
To paraphrase Freemarker Documentation FAQ on this,
You can't use non-string keys in the myMap[key] expression. You can use methods!
So, you could create a bean that provides a way for you to get to your Java EnumMap, (i.e). Then just instantiate this bean with your mapp, and put the bean in your Model.
class EnumMap
{
HashMap<MyEnum, String> map = new HashMap<MyEnum, String>();
public String getValue(MyEnum e)
{
return map.get(e);
}
..constructor, generics, getters, setters left out.
}
I'm a little bit confused about what general goal your trying to accomplish. If you just need to list out the values of the enum (or perhaps a display value for each one). There is a much easier way to do it.
One way I've seen this problem solved is by putting a display value on the Enum instances.
i.e
enum MyEnum
{ FOO("Foo"),
BAR_EXAMPLE("Bar Example");
private String displayValue;
MyEnum(String displayValue)
{
this.displayValue = displayValue;
}
public String getDisplay()
{
return displayValue;
}
}
This allows you to put the Enum itself into your configuration, and iterate over all instances.
SimpleHash globalModel = new SimpleHash();
TemplateHashModel enumModels = BeansWrapper.getDefaultInstance().getEnumModels();
TemplateHashModel myEnumModel = (TemplateHashModel) enumModels.get("your.fully.qualified.enum.MyEnum");
globalModel.put("MyEnum", myEnumModel);
freemarkerConfiguration.setAllSharedVariables(globalModel);
Then you can iterate over the enum,
<#list MyEnum?values as item>
${item.display}
</#list>
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With