/**
* Check if the resource was changed from previous run. The implementation uses resource content
* digest (hash) to check for change.
*
* @param resource the {@link Resource} to check.
* @return true if the resource was changed.
*/
private boolean isChanged(final Resource resource, final String groupName) {
LOG.debug("Check change for resource {}", resource.getUri());
try {
final String uri = resource.getUri();
// using AtomicBoolean because we need to mutate this variable inside an anonymous class.
final AtomicBoolean changeDetected =
new AtomicBoolean(getResourceChangeDetector().checkChangeForGroup(uri, groupName));
if (!changeDetected.get() && resource.getType() == ResourceType.CSS) {
final Reader reader = new InputStreamReader(locatorFactory.locate(uri));
LOG.debug("Check @import directive from {}", resource);
createCssImportProcessor(changeDetected, groupName)
.process(resource, reader, new StringWriter());
}
return changeDetected.get();
} catch (final IOException e) {
LOG.debug(
"[FAIL] Cannot check {} resource (Exception message: {}). Assuming it is unchanged...",
resource,
e.getMessage());
return false;
}
}
/** {@inheritDoc} */
@Override
protected void doContribution(
final Group group, final ModelAndView modelAndView, final Map<String, Group> additionalGroups)
throws IOException {
String bundle = group.getName();
Map<String, Object> model = modelAndView.getModel();
StringBuilder buffer = new StringBuilder();
if (useCache()) {
buffer.append(script("/bundle/" + bundle + ".js?v=" + version));
} else {
List<Resource> candidates = group.getResources();
List<Resource> resources = new ArrayList<Resource>();
for (Resource resource : candidates) {
if (resource.getType() == ResourceType.JS) {
buffer.append(script(resource.getUri()));
resources.add(resource);
}
}
model.put(resourcesVarName(), resources);
}
// 2. Publish as a model attribute.
model.put(varName(), buffer.toString());
logger.trace("Publishing {}:\n{}", varName(), buffer);
}