/**
* Creates a new attribute service using the given providers and user provided default attribute
* values.
*/
public AttributeService(
Iterable<? extends AttributeProvider> providers, Map<String, ?> userProvidedDefaults) {
ImmutableMap.Builder<String, AttributeProvider> byViewNameBuilder = ImmutableMap.builder();
ImmutableMap.Builder<Class<?>, AttributeProvider> byViewTypeBuilder = ImmutableMap.builder();
ImmutableMap.Builder<Class<?>, AttributeProvider> byAttributesTypeBuilder =
ImmutableMap.builder();
ImmutableList.Builder<FileAttribute<?>> defaultAttributesBuilder = ImmutableList.builder();
for (AttributeProvider provider : providers) {
byViewNameBuilder.put(provider.name(), provider);
byViewTypeBuilder.put(provider.viewType(), provider);
if (provider.attributesType() != null) {
byAttributesTypeBuilder.put(provider.attributesType(), provider);
}
for (Map.Entry<String, ?> entry : provider.defaultValues(userProvidedDefaults).entrySet()) {
defaultAttributesBuilder.add(new SimpleFileAttribute<>(entry.getKey(), entry.getValue()));
}
}
this.providersByName = byViewNameBuilder.build();
this.providersByViewType = byViewTypeBuilder.build();
this.providersByAttributesType = byAttributesTypeBuilder.build();
this.defaultValues = defaultAttributesBuilder.build();
}
private static void addStandardProvider(Map<String, AttributeProvider> result, String view) {
AttributeProvider provider = StandardAttributeProviders.get(view);
if (provider == null) {
if (!result.containsKey(view)) {
throw new IllegalStateException("no provider found for attribute view '" + view + "'");
}
} else {
result.put(provider.name(), provider);
}
}
private static Iterable<AttributeProvider> getProviders(Configuration configuration) {
Map<String, AttributeProvider> result = new HashMap<>();
for (AttributeProvider provider : configuration.attributeProviders) {
result.put(provider.name(), provider);
}
for (String view : configuration.attributeViews) {
addStandardProvider(result, view);
}
addMissingProviders(result);
return Collections.unmodifiableCollection(result.values());
}