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// Copyright 2014 Google Inc. 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.skyframe;
import com.google.devtools.build.lib.cmdline.PackageIdentifier;
import com.google.devtools.build.lib.syntax.BuildFileAST;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import javax.annotation.Nullable;
/**
* A value that represents an AST file lookup result.
*/
public class ASTFileLookupValue implements SkyValue {
private static final ASTFileLookupValue NO_FILE = new ASTFileLookupValue(null);
@Nullable private final BuildFileAST ast;
private ASTFileLookupValue(@Nullable BuildFileAST ast) {
this.ast = ast;
}
public static ASTFileLookupValue noFile() {
return NO_FILE;
}
public static ASTFileLookupValue withFile(BuildFileAST ast) {
return new ASTFileLookupValue(ast);
}
/**
* Returns the original AST file.
*/
@Nullable public BuildFileAST getAST() {
return ast;
}
static SkyKey key(PackageIdentifier astFileIdentifier) {
return new SkyKey(SkyFunctions.AST_FILE_LOOKUP, astFileIdentifier);
}
static final class ASTLookupInputException extends Exception {
ASTLookupInputException(String msg) {
super(msg);
}
}
}
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