| // Copyright 2020 The Bazel Authors. All rights reserved. |
| // |
| // 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. |
| package com.google.devtools.build.lib.analysis.actions; |
| |
| import com.google.protobuf.ByteString; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| /** |
| * A deterministic writer writes bytes to an output stream. The same byte stream is written on every |
| * invocation of writeOutputFile(). |
| */ |
| public interface DeterministicWriter { |
| void writeOutputFile(OutputStream out) throws IOException; |
| |
| /** |
| * Returns the contents that would be written, as a {@link ByteString}. Used when the caller wants |
| * a {@link ByteString} in the end, to avoid making unnecessary copies. |
| */ |
| default ByteString getBytes() throws IOException { |
| ByteString.Output out = ByteString.newOutput(); |
| writeOutputFile(out); |
| return out.toByteString(); |
| } |
| } |