| /* |
| * |
| * 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 |