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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.analysis.actions;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.actions.Artifact.ArtifactExpander;
import com.google.devtools.build.lib.collect.CollectionUtils;
/** A representation of a list of arguments, often a command executed by {@link SpawnAction}. */
public abstract class CommandLine {
public static final CommandLine EMPTY =
new CommandLine() {
@Override
public Iterable<String> arguments() {
return ImmutableList.of();
}
};
/**
* Returns the command line.
*/
public abstract Iterable<String> arguments();
/**
* Returns the evaluated command line with enclosed artifacts expanded by {@code artifactExpander}
* at execution time.
*
* <p>By default, this method just delegates to {@link #arguments()}, without performing any
* artifact expansion. Subclasses should override this method if they contain TreeArtifacts and
* need to expand them for proper argument evaluation.
*/
public Iterable<String> arguments(ArtifactExpander artifactExpander) {
return arguments();
}
/** Returns a {@link CommandLine} backed by a copy of the given list of arguments. */
public static CommandLine of(Iterable<String> arguments) {
final Iterable<String> immutableArguments = CollectionUtils.makeImmutable(arguments);
return new CommandLine() {
@Override
public Iterable<String> arguments() {
return immutableArguments;
}
};
}
/**
* Returns a {@link CommandLine} that is constructed by prepending the {@code executableArgs} to
* {@code commandLine}.
*/
public static CommandLine concat(
final ImmutableList<String> executableArgs, final CommandLine commandLine) {
if (executableArgs.isEmpty()) {
return commandLine;
}
return new CommandLine() {
@Override
public Iterable<String> arguments() {
return Iterables.concat(executableArgs, commandLine.arguments());
}
@Override
public Iterable<String> arguments(ArtifactExpander artifactExpander) {
return Iterables.concat(executableArgs, commandLine.arguments(artifactExpander));
}
};
}
/**
* Returns a {@link CommandLine} that is constructed by appending the {@code args} to {@code
* commandLine}.
*/
public static CommandLine concat(
final CommandLine commandLine, final ImmutableList<String> args) {
if (args.isEmpty()) {
return commandLine;
}
return new CommandLine() {
@Override
public Iterable<String> arguments() {
return Iterables.concat(commandLine.arguments(), args);
}
@Override
public Iterable<String> arguments(ArtifactExpander artifactExpander) {
return Iterables.concat(commandLine.arguments(artifactExpander), args);
}
};
}
/**
* This helps when debugging Blaze code that uses {@link CommandLine}s, as you can see their
* content directly in the variable inspector.
*/
@Override
public String toString() {
return Joiner.on(' ').join(arguments());
}
}
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