diff options
author | Jorge Canizales <jcanizales@google.com> | 2015-07-16 18:41:21 -0700 |
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committer | Jorge Canizales <jcanizales@google.com> | 2015-07-17 11:49:58 -0700 |
commit | 7b52c98e625ee5fbfb2fd205750124836bb9f46b (patch) | |
tree | 7a0120d4b538db6180d23a52a4afb187d67740a5 /src/objective-c/RxLibrary/GRXForwardingWriter.m | |
parent | e85483b39248b42512571ab7eb92c5fdff6304c3 (diff) |
Separate GRXForwardingWriter, delete the protocol
Diffstat (limited to 'src/objective-c/RxLibrary/GRXForwardingWriter.m')
-rw-r--r-- | src/objective-c/RxLibrary/GRXForwardingWriter.m | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/src/objective-c/RxLibrary/GRXForwardingWriter.m b/src/objective-c/RxLibrary/GRXForwardingWriter.m new file mode 100644 index 0000000000..755f7d7b84 --- /dev/null +++ b/src/objective-c/RxLibrary/GRXForwardingWriter.m @@ -0,0 +1,112 @@ +/* + * + * Copyright 2015, 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 "GRXForwardingWriter.h" + +@interface GRXForwardingWriter () <GRXWriteable> +@end + +@implementation GRXForwardingWriter { + id<GRXWriter> _writer; + id<GRXWriteable> _writeable; +} + +- (instancetype)init { + return [self initWithWriter:nil]; +} + +// Designated initializer +- (instancetype)initWithWriter:(id<GRXWriter>)writer { + if (!writer) { + [NSException raise:NSInvalidArgumentException format:@"writer can't be nil."]; + } + if ((self = [super init])) { + _writer = writer; + } + return self; +} + +// This is used to send a completion or an error to the writeable. It nillifies +// our reference to it in order to guarantee no more messages are sent to it, +// and to release it. +- (void)finishOutputWithError:(NSError *)errorOrNil { + id<GRXWriteable> writeable = _writeable; + _writeable = nil; + [writeable writesFinishedWithError:errorOrNil]; +} + +// This is used to stop the input writer. It nillifies our reference to it +// to release it. +- (void)finishInput { + id<GRXWriter> writer = _writer; + _writer = nil; + writer.state = GRXWriterStateFinished; +} + +#pragma mark GRXWriteable implementation + +- (void)writeValue:(id)value { + [_writeable writeValue:value]; +} + +- (void)writesFinishedWithError:(NSError *)errorOrNil { + _writer = nil; + [self finishOutputWithError:errorOrNil]; +} + +#pragma mark GRXWriter implementation + +- (GRXWriterState)state { + return _writer ? _writer.state : GRXWriterStateFinished; +} + +- (void)setState:(GRXWriterState)state { + if (state == GRXWriterStateFinished) { + _writeable = nil; + [self finishInput]; + } else { + _writer.state = state; + } +} + +- (void)startWithWriteable:(id<GRXWriteable>)writeable { + _writeable = writeable; + [_writer startWithWriteable:self]; +} + +- (void)finishWithError:(NSError *)errorOrNil { + [self finishOutputWithError:errorOrNil]; + [self finishInput]; +} + +@end |