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/*
*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#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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