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/*
*
* Copyright 2016 gRPC authors.
*
* 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 "GRXImmediateSingleWriter.h"
@implementation GRXImmediateSingleWriter {
id _value;
id<GRXWriteable> _writeable;
}
@synthesize state = _state;
- (instancetype)initWithValue:(id)value {
if (self = [super init]) {
_value = value;
_state = GRXWriterStateNotStarted;
}
return self;
}
+ (GRXWriter *)writerWithValue:(id)value {
return [[self alloc] initWithValue:value];
}
- (void)startWithWriteable:(id<GRXWriteable>)writeable {
_state = GRXWriterStateStarted;
_writeable = writeable;
[writeable writeValue:_value];
[self finish];
}
- (void)finish {
_state = GRXWriterStateFinished;
_value = nil;
id<GRXWriteable> writeable = _writeable;
_writeable = nil;
[writeable writesFinishedWithError:nil];
}
// Overwrite the setter to disallow manual state transition. The getter
// of _state is synthesized.
- (void)setState:(GRXWriterState)newState {
// Manual state transition is not allowed
return;
}
// Overrides [requestWriter(Transformations):map:] for Protocol Buffers
// encoding.
// We need the return value of this map to be a GRXImmediateSingleWriter but
// the original \a map function returns a new Writer of another type. So we
// need to override this function here.
- (GRXWriter *)map:(id (^)(id))map {
// Since _value is available when creating the object, we can simply
// apply the map and store the output.
_value = map(_value);
return self;
}
@end
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