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// Copyright 2015 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.java.bazel;
import static com.google.common.collect.ImmutableList.toImmutableList;
import com.google.common.collect.ImmutableList;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOError;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
/**
* Utility class to provide java-level access to the blessed javac boot class path: {@code
* //tools/defaults:javac_bootclasspath}, as defined by bazel's --javac_bootclasspath flag.
*
* <p>This class is typically used only from a host build tool or in tests. When using this in
* production, the bootclasspath is deployed as separate jar files within the runfiles directory.
*/
public class JavacBootclasspath {
private static final List<File> AS_FILES;
private static final String AS_STRING;
private static String getRunfilesDir() {
String dir = System.getenv("JAVA_RUNFILES");
if (dir == null) {
dir = System.getenv("TEST_SRCDIR");
}
if (dir == null) {
throw new IllegalStateException(
"Neither JAVA_RUNFILES nor TEST_SRCDIR environment variable was defined!");
}
return dir;
}
static {
String[] locations = JavacBootclasspathLocations.BOOTCLASSPATH.split(":");
String runfilesRoot = getRunfilesDir();
List<File> files = new ArrayList<>(locations.length);
StringBuilder str = new StringBuilder();
for (String location : locations) {
File file = new File(runfilesRoot, location);
if (!file.isFile()) {
throw new IOError(
new FileNotFoundException("Can't find boot class path element: " + file.getPath()));
}
files.add(file);
if (str.length() > 0) {
str.append(':');
}
str.append(file.getAbsolutePath());
}
AS_FILES = files;
AS_STRING = str.toString();
}
/**
* Returns the blessed boot class path as a colon-separated string.
*
* <p>Suitable for passing as the value of a {@code -bootclasspath} flag. Valid while the current
* build action or test is executing.
*/
public static String asString() {
return AS_STRING;
}
/**
* Returns the blessed boot class path as a list of {@code File} objects.
*
* <p>Each {@code File} will represent a jar file that will exist while the current build action
* or test is executing.
*/
public static List<File> asFiles() {
return new ArrayList<>(AS_FILES);
}
/** Returns the blessed boot class path as a list of {@code Path}s. */
public static ImmutableList<Path> asPaths() {
return asFiles().stream().map(File::toPath).map(Path::normalize).collect(toImmutableList());
}
}
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