Add a common base for Darwin MTR*Path interfaces.

src/darwin/Framework/CHIP/MTRBaseDevice.h

@@ -298,9 +298,26 @@ extern NSString * const MTRArrayValueType;
 
 @end
 
-@interface MTRAttributePath : NSObject <NSCopying>
+/**
+ * A path indicating a specific cluster on a device (i.e. without any
+ * wildcards).
+ */
+MTR_NEWLY_AVAILABLE
+@interface MTRClusterPath : NSObject <NSCopying>
 @property (nonatomic, readonly, copy) NSNumber * endpoint;
 @property (nonatomic, readonly, copy) NSNumber * cluster;
+
++ (instancetype)clusterPathWithEndpointID:(NSNumber *)endpointID clusterID:(NSNumber *)clusterID;
+
+- (instancetype)init NS_UNAVAILABLE;
++ (instancetype)new NS_UNAVAILABLE;
+@end
+
+/**
+ * A path indicating a specific attribute on a device (i.e. without any
+ * wildcards).
+ */
+@interface MTRAttributePath : MTRClusterPath <NSCopying>
 @property (nonatomic, readonly, copy) NSNumber * attribute;
 
 + (instancetype)attributePathWithEndpointID:(NSNumber *)endpointID
@@ -311,9 +328,12 @@ extern NSString * const MTRArrayValueType;
 + (instancetype)new NS_UNAVAILABLE;
 @end
 
-@interface MTREventPath : NSObject
-@property (nonatomic, readonly, copy) NSNumber * endpoint;
-@property (nonatomic, readonly, copy) NSNumber * cluster;
+/**
+ * A path indicating a specific event that can be emitted on a device
+ * (i.e. without any wildcards).  There can be multiple instances of actual
+ * events for a given event path.
+ */
+@interface MTREventPath : MTRClusterPath <NSCopying>
 @property (nonatomic, readonly, copy) NSNumber * event;
 
 + (instancetype)eventPathWithEndpointID:(NSNumber *)endpointID
@@ -324,9 +344,11 @@ extern NSString * const MTRArrayValueType;
 + (instancetype)new NS_UNAVAILABLE;
 @end
 
-@interface MTRCommandPath : NSObject
-@property (nonatomic, readonly, copy) NSNumber * endpoint;
-@property (nonatomic, readonly, copy) NSNumber * cluster;
+/**
+ * A path indicating a specific command on a device (i.e. without any
+ * wildcards).
+ */
+@interface MTRCommandPath : MTRClusterPath <NSCopying>
 @property (nonatomic, readonly, copy) NSNumber * command;
 
 + (instancetype)commandPathWithEndpointID:(NSNumber *)endpointID

src/darwin/Framework/CHIP/MTRBaseDevice.mm

@@ -1558,12 +1558,59 @@ - (void)deregisterReportHandlersWithClientQueue:(dispatch_queue_t)queue completi
 
 @end
 
-@implementation MTRAttributePath
-- (instancetype)initWithPath:(const ConcreteDataAttributePath &)path
+@implementation MTRClusterPath
+- (instancetype)initWithPath:(const ConcreteClusterPath &)path
 {
     if (self = [super init]) {
         _endpoint = @(path.mEndpointId);
         _cluster = @(path.mClusterId);
+    }
+    return self;
+}
+
+- (NSString *)description
+{
+    return [NSString stringWithFormat:@"<MTRClusterPath> endpoint %u cluster %u", (uint16_t) _endpoint.unsignedShortValue,
+                     (uint32_t) _cluster.unsignedLongValue];
+}
+
++ (instancetype)clusterPathWithEndpointID:(NSNumber *)endpointID clusterID:(NSNumber *)clusterID
+{
+    ConcreteClusterPath path(static_cast<chip::EndpointId>([endpointID unsignedShortValue]),
+        static_cast<chip::ClusterId>([clusterID unsignedLongValue]));
+
+    return [[MTRClusterPath alloc] initWithPath:path];
+}
+
+- (BOOL)isEqualToClusterPath:(MTRClusterPath *)clusterPath
+{
+    return [_endpoint isEqualToNumber:clusterPath.endpoint] && [_cluster isEqualToNumber:clusterPath.cluster];
+}
+
+- (BOOL)isEqual:(id)object
+{
+    if (![object isKindOfClass:[self class]]) {
+        return NO;
+    }
+    return [self isEqualToClusterPath:object];
+}
+
+- (NSUInteger)hash
+{
+    return _endpoint.unsignedShortValue ^ _cluster.unsignedLongValue;
+}
+
+- (id)copyWithZone:(NSZone *)zone
+{
+    return [MTRClusterPath clusterPathWithEndpointID:_endpoint clusterID:_cluster];
+}
+
+@end
+
+@implementation MTRAttributePath
+- (instancetype)initWithPath:(const ConcreteDataAttributePath &)path
+{
+    if (self = [super initWithPath:path]) {
         _attribute = @(path.mAttributeId);
     }
     return self;
@@ -1572,7 +1619,7 @@ - (instancetype)initWithPath:(const ConcreteDataAttributePath &)path
 - (NSString *)description
 {
     return [NSString stringWithFormat:@"<MTRAttributePath> endpoint %u cluster %u attribute %u",
-                     (uint16_t) _endpoint.unsignedShortValue, (uint32_t) _cluster.unsignedLongValue,
+                     (uint16_t) self.endpoint.unsignedShortValue, (uint32_t) self.cluster.unsignedLongValue,
                      (uint32_t) _attribute.unsignedLongValue];
 }
 
@@ -1589,8 +1636,7 @@ ConcreteDataAttributePath path(static_cast<chip::EndpointId>([endpointID unsigne
 
 - (BOOL)isEqualToAttributePath:(MTRAttributePath *)attributePath
 {
-    return [_endpoint isEqualToNumber:attributePath.endpoint] && [_cluster isEqualToNumber:attributePath.cluster] &&
-        [_attribute isEqualToNumber:attributePath.attribute];
+    return [self isEqualToClusterPath:attributePath] && [_attribute isEqualToNumber:attributePath.attribute];
 }
 
 - (BOOL)isEqual:(id)object
@@ -1603,12 +1649,12 @@ - (BOOL)isEqual:(id)object
 
 - (NSUInteger)hash
 {
-    return _endpoint.unsignedShortValue ^ _cluster.unsignedLongValue ^ _attribute.unsignedLongValue;
+    return self.endpoint.unsignedShortValue ^ self.cluster.unsignedLongValue ^ _attribute.unsignedLongValue;
 }
 
 - (id)copyWithZone:(NSZone *)zone
 {
-    return [MTRAttributePath attributePathWithEndpointID:_endpoint clusterID:_cluster attributeID:_attribute];
+    return [MTRAttributePath attributePathWithEndpointID:self.endpoint clusterID:self.cluster attributeID:_attribute];
 }
 @end
 
@@ -1624,9 +1670,7 @@ + (instancetype)attributePathWithEndpointId:(NSNumber *)endpointId
 @implementation MTREventPath
 - (instancetype)initWithPath:(const ConcreteEventPath &)path
 {
-    if (self = [super init]) {
-        _endpoint = @(path.mEndpointId);
-        _cluster = @(path.mClusterId);
+    if (self = [super initWithPath:path]) {
         _event = @(path.mEventId);
     }
     return self;
@@ -1642,7 +1686,7 @@ ConcreteEventPath path(static_cast<chip::EndpointId>([endpointID unsignedShortVa
 
 - (id)copyWithZone:(NSZone *)zone
 {
-    return [MTREventPath eventPathWithEndpointID:_endpoint clusterID:_cluster eventID:_event];
+    return [MTREventPath eventPathWithEndpointID:self.endpoint clusterID:self.cluster eventID:_event];
 }
 @end
 
@@ -1656,9 +1700,7 @@ + (instancetype)eventPathWithEndpointId:(NSNumber *)endpointId clusterId:(NSNumb
 @implementation MTRCommandPath
 - (instancetype)initWithPath:(const ConcreteCommandPath &)path
 {
-    if (self = [super init]) {
-        _endpoint = @(path.mEndpointId);
-        _cluster = @(path.mClusterId);
+    if (self = [super initWithPath:path]) {
         _command = @(path.mCommandId);
     }
     return self;
@@ -1674,7 +1716,7 @@ ConcreteCommandPath path(static_cast<chip::EndpointId>([endpointID unsignedShort
 
 - (id)copyWithZone:(NSZone *)zone
 {
-    return [MTRCommandPath commandPathWithEndpointID:_endpoint clusterID:_cluster commandID:_command];
+    return [MTRCommandPath commandPathWithEndpointID:self.endpoint clusterID:self.cluster commandID:_command];
 }
 @end
 

src/darwin/Framework/CHIP/MTRBaseDevice_Internal.h

@@ -71,6 +71,10 @@ NS_ASSUME_NONNULL_BEGIN
 
 @end
 
+@interface MTRClusterPath ()
+- (instancetype)initWithPath:(const chip::app::ConcreteClusterPath &)path;
+@end
+
 @interface MTRAttributePath ()
 - (instancetype)initWithPath:(const chip::app::ConcreteDataAttributePath &)path;
 @end