// Diffusion Client Library for iOS, tvOS and OS X / macOS - Examples

//

// Copyright (C) 2015 - 2023 DiffusionData Ltd.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

// http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#import "FetchExample.h"

@import Diffusion;

/**

Example of fetch without values.

*/

@implementation FetchExample {

PTDiffusionSession* _session;

}

-(void)startWithURL:(NSURL*)url {

NSLog(@"Connecting...");

[PTDiffusionSession openWithURL:url

completionHandler:^(PTDiffusionSession *session, NSError *error)

{

if (!session) {

NSLog(@"Failed to open session: %@", error);

return;

}

// At this point we now have a connected session.

NSLog(@"Connected.");

// Set ivar to maintain a strong reference to the session.

self->_session = session;

// Send fetch request.

[[session.topics fetchRequest] fetchWithTopicSelectorExpression:@"*Assets//"

completionHandler:

^(PTDiffusionFetchResult* result, NSError* error)

{

if (result) {

for (PTDiffusionFetchTopicResult* topicResult in result.results) {

NSLog(@"Fetch topic result, \"%@\": %@",

topicResult.path,

topicResult.specification);

}

} else {

NSLog(@"Fetch failed with error: %@", error);

}

}];

// perform the same operation as above but use limitDeepbranches.

// A deep branch has a root path that has a

// number of parts equal to the deep_branch_depth parameter.

// The deep_branch_limit specifies the maximum number of results for each deep branch.

PTDiffusionFetchRequest *const request =

[session.topics.fetchRequest limitDeepBranches:3

limit:3];

[request fetchBinaryValuesWithTopicSelectorExpression:@"?.//"

completionHandler:

^(PTDiffusionBinaryFetchResult *const result, NSError *const error)

{

if (result) {

for (PTDiffusionFetchTopicResult* topicResult in result.results) {

NSLog(@"Fetch topic result, \"%@\": %@",

topicResult.path,

topicResult.specification);

}

} else {

NSLog(@"Fetch failed with error: %@", error);

}

}];

}];

}

@end