private void bindParameterFromTemplate(ComponentPageElement component, AttributeToken token) {
String name = token.getName();
ComponentResources resources = component.getComponentResources();
// If already bound (i.e., from the component class, via @Component), then
// ignore the value in the template. This may need improving to just ignore
// the value if it is an unprefixed literal string.
if (resources.isBound(name)) return;
// Meta default of literal for the template.
String defaultBindingPrefix =
determineDefaultBindingPrefix(component, name, BindingConstants.LITERAL);
Binding binding =
findBinding(
loadingElement,
component,
name,
token.getValue(),
defaultBindingPrefix,
token.getLocation());
if (binding != null) {
component.bindParameter(name, binding);
Map<String, Binding> bindingMap = componentIdToBindingMap.get(component.getCompleteId());
bindingMap.put(name, binding);
}
}
private void block(BlockToken token) {
String id = token.getId();
// Don't use the page element factory here becauses we need something that is both Block and
// BodyPageElement and don't want to use casts.
String description =
id == null
? String.format("Anonymous within %s", loadingElement.getCompleteId())
: String.format("%s within %s", id, loadingElement.getCompleteId());
BlockImpl block = new BlockImpl(token.getLocation(), description);
if (id != null) loadingElement.addBlock(id, block);
setupBlock(block);
}
/**
* Creates a new binding, or returns an existing binding (or null) for the "inherit:" binding prefix. Mostly a
* wrapper around {@link BindingSource#newBinding(String, ComponentResources, ComponentResources, String, String,
* Location)
*
* @return the new binding, or an existing binding (if inherited), or null (if inherited, and the containing
* parameter is not bound)
*/
private Binding findBinding(
ComponentPageElement loadingComponent,
ComponentPageElement component,
String name,
String value,
String defaultBindingPrefix,
Location location) {
if (value.startsWith(INHERIT_PREFIX)) {
String loadingParameterName = value.substring(INHERIT_PREFIX.length());
Map<String, Binding> loadingComponentBindingMap =
componentIdToBindingMap.get(loadingComponent.getCompleteId());
// This may return null if the parameter is not bound in the loading component.
Binding existing = loadingComponentBindingMap.get(loadingParameterName);
if (existing == null) return null;
String description =
String.format(
"InheritedBinding[parameter %s %s(inherited from %s of %s)]",
name,
component.getCompleteId(),
loadingParameterName,
loadingComponent.getCompleteId());
// This helps with debugging, and re-orients any thrown exceptions
// to the location of the inherited binding, rather than the container component's
// binding.
return new InheritedBinding(description, existing, location);
}
return pageElementFactory.newBinding(
name,
loadingComponent.getComponentResources(),
component.getComponentResources(),
defaultBindingPrefix,
value,
location);
}
private void parameter(ParameterToken token) {
ComponentPageElement element = activeElementStack.peek();
String name = token.getName();
BlockImpl block =
new BlockImpl(
token.getLocation(), String.format("Parmeter %s of %s", name, element.getCompleteId()));
Binding binding = new LiteralBinding("block parameter " + name, block, token.getLocation());
// TODO: Check that the t:parameter doesn't appear outside of an embedded component.
element.bindParameter(name, binding);
setupBlock(block);
}
private void startComponent(StartComponentToken token) {
String elementName = token.getElementName();
// Initial guess: the type from the token (but this may be null in many cases).
String embeddedType = token.getComponentType();
// This may be null for an anonymous component.
String embeddedId = token.getId();
String embeddedComponentClassName = null;
final EmbeddedComponentModel embeddedModel =
embeddedId == null ? null : loadingComponentModel.getEmbeddedComponentModel(embeddedId);
// We know that if embeddedId is null, embeddedType is not.
if (embeddedId == null) embeddedId = generateEmbeddedId(embeddedType, idAllocator);
if (embeddedModel != null) {
String modelType = embeddedModel.getComponentType();
if (InternalUtils.isNonBlank(modelType) && embeddedType != null)
throw new TapestryException(
ServicesMessages.compTypeConflict(embeddedId, embeddedType, modelType), token, null);
embeddedType = modelType;
embeddedComponentClassName = embeddedModel.getComponentClassName();
}
// We only have the embeddedModel if the embeddedId was specified. If embeddedType was ommitted
// and
if (InternalUtils.isBlank(embeddedType) && embeddedModel == null)
throw new TapestryException(
ServicesMessages.noTypeForEmbeddedComponent(
embeddedId, loadingComponentModel.getComponentClassName()),
token,
null);
final ComponentPageElement newComponent =
pageElementFactory.newComponentElement(
page,
loadingElement,
embeddedId,
embeddedType,
embeddedComponentClassName,
elementName,
token.getLocation());
addMixinsToComponent(newComponent, embeddedModel, token.getMixins());
final Map<String, Binding> newComponentBindings = CollectionFactory.newMap();
componentIdToBindingMap.put(newComponent.getCompleteId(), newComponentBindings);
if (embeddedModel != null)
bindParametersFromModel(embeddedModel, loadingElement, newComponent, newComponentBindings);
addToBody(newComponent);
// Remember to load the template for this new component
componentQueue.push(newComponent);
// Any attribute tokens that immediately follow should be
// used to bind parameters.
addAttributesAsComponentBindings = true;
// Any attributes (including component parameters) that come up belong on this component.
activeElementStack.push(newComponent);
// Set things up so that content inside the component is added to the component's body.
bodyPageElementStack.push(newComponent);
// And clean that up when the end element is reached.
final ComponentModel newComponentModel =
newComponent.getComponentResources().getComponentModel();
// If the component was from an embedded @Component annotation, and it is inheritting informal
// parameters,
// and the component in question supports informal parameters, than get those inheritted
// informal parameters ...
// but later (this helps ensure that <t:parameter> elements that may provide informal parameters
// are
// visible when the informal parameters are copied to the child component).
if (embeddedModel != null
&& embeddedModel.getInheritInformalParameters()
&& newComponentModel.getSupportsInformalParameters()) {
final ComponentPageElement loadingElement = this.loadingElement;
Runnable finalizer =
new Runnable() {
public void run() {
handleInformalParameters(
loadingElement,
embeddedModel,
newComponent,
newComponentModel,
newComponentBindings);
}
};
finalization.add(finalizer);
}
Runnable cleanup =
new Runnable() {
public void run() {
// May need a separate queue for this, to execute at the very end of page loading.
activeElementStack.pop();
bodyPageElementStack.pop();
}
};
// The start tag is not added to the body of the component, so neither should
// the end tag.
configureEnd(true, cleanup);
}