I am developing a tag, see tag example below. This tag should produce a json
object using the elements into the value stack.
I need to know how to repeat the execution of the content in this case
<jsongl:jsonproperty/> , also every execution need to push a new item into
the valuestack.
So I develop the tag using Component#start() and Component#end() methods,
the tag work but it isn't iterate the list of elements, and only produce
this output with the last element:
"array3": ["m2"]
correct output:
"array3": ["m1","m2"]
tag example:
<jsongl:jsonarray name="machines" items="%{machine}">
<jsongl:jsonproperty value="%{code}"/>
</jsongl:jsonarray>
source code:
==================
//start
public boolean start(Writer writer) {
LOG.debug("starting");
boolean result = super.start(writer);
try{
if (mItemsPropertySet) {
coerceItemsToIterator();
// An items property has been set - if there's anything in
it, then iterate over the items
if (iterator != null && iterator.hasNext()){
iterateOverItems();
}
} else {
// No collection, so just process the body which should add
items to the array
// Writer passed here is used to prevent any body content
being written to output stream
}
} catch (JspException e){
// Just rethrow if we got a JspException - it's probably from a
nested tag - no new
// info for us to add here.
LOG.error("Just rethrow if we got a JspException - it's probably
from a nested tag");
} catch (Exception e){
LOG.error("Unable to create JSON array");
}
LOG.debug("finish");
return result;
}
// end method
public boolean end(Writer writer, String body) {
LOG.debug("starting");
boolean result = false;
ValueStack stack = getStack();
if (iterator != null) {
stack.pop();
}
if (iterator != null && iterator.hasNext()) {
Object currentItem = iterator.next();
stack.push(currentItem);
LOG.debug("repeat with next element on array body");
return true;
} //else {
try {
LOG.debug("Adding a new Json array object to parent
JsonObject");
// Pop the array jsonEntity off of the stack
this.getEntityStack().pop();
// add the child array object to the parent jsonObject
this.getCurrentEntity().add(jsonEntity.getWrappedObject(),
this.name);
} catch (JSONException e) {
LOG.error("Unable to create JSON array object", e);
// TODO: handle exception
}
// }
// helper method
private void iterateOverItems() throws JspException, IOException {
ValueStack valueStack = getStack();
// Iterator over 'items' collection
while (iterator.hasNext()){
Object currentItem = iterator.next();
valueStack.push(currentItem);
LOG.debug("item: " + currentItem);
}
}
--
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