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// Copyright 2014 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.actions.cache;
import com.google.common.base.Preconditions;
import com.google.devtools.build.lib.actions.ActionInput;
import com.google.devtools.build.lib.actions.FileArtifactValue;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.protobuf.ByteString;
import java.io.IOException;
import java.io.OutputStream;
/**
* An ActionInput that does not actually exist on the filesystem, but can still be written to an
* OutputStream.
*/
public interface VirtualActionInput extends ActionInput {
/**
* Writes the fake file to an OutputStream. MUST be deterministic, in that multiple calls to write
* the same VirtualActionInput must write identical bytes.
*/
void writeTo(OutputStream out) throws IOException;
/**
* Gets a {@link ByteString} representation of the fake file. Used to avoid copying if the fake
* file is internally represented as a {@link ByteString}.
*/
ByteString getBytes() throws IOException;
/**
* Returns the metadata for this input if available. Null otherwise.
*
* @throws IOException
*/
default FileArtifactValue getMetadata() throws IOException {
return null;
}
/**
* In some cases, we want empty files in the runfiles tree that have no corresponding artifact. We
* use instances of this class to represent those files.
*/
public final class EmptyActionInput implements VirtualActionInput {
private final PathFragment execPath;
public EmptyActionInput(PathFragment execPath) {
this.execPath = Preconditions.checkNotNull(execPath);
}
public EmptyActionInput(String execPath) {
this(PathFragment.create(execPath));
}
@Override
public String getExecPathString() {
return execPath.getPathString();
}
@Override
public PathFragment getExecPath() {
return execPath;
}
@Override
public void writeTo(OutputStream out) throws IOException {
// Write no content - it's an empty file.
}
@Override
public ByteString getBytes() throws IOException {
return ByteString.EMPTY;
}
@Override
public String toString() {
return "EmptyActionInput: " + execPath;
}
}
}
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