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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.rules.java;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.analysis.RuleConfiguredTarget.Mode;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.TransitiveInfoCollection;
import com.google.devtools.build.lib.packages.BuildType;
import com.google.devtools.build.lib.shell.ShellUtils;
import java.util.ArrayList;
import java.util.List;
/**
* Utility methods for use by Java-related parts of Bazel.
*/
// TODO(bazel-team): Merge with JavaUtil.
public abstract class JavaHelper {
private JavaHelper() {}
/**
* Returns the java launcher implementation for the given target, if any.
* A null return value means "use the JDK launcher".
*/
public static TransitiveInfoCollection launcherForTarget(JavaSemantics semantics,
RuleContext ruleContext) {
String launcher = filterLauncherForTarget(semantics, ruleContext);
return (launcher == null) ? null : ruleContext.getPrerequisite(launcher, Mode.TARGET);
}
/**
* Returns the java launcher artifact for the given target, if any.
* A null return value means "use the JDK launcher".
*/
public static Artifact launcherArtifactForTarget(JavaSemantics semantics,
RuleContext ruleContext) {
String launcher = filterLauncherForTarget(semantics, ruleContext);
return (launcher == null) ? null : ruleContext.getPrerequisiteArtifact(launcher, Mode.TARGET);
}
/**
* Control structure abstraction for safely extracting a prereq from the launcher attribute
* or --java_launcher flag.
*/
private static String filterLauncherForTarget(JavaSemantics semantics, RuleContext ruleContext) {
// BUILD rule "launcher" attribute
if (ruleContext.getRule().isAttrDefined("launcher", BuildType.LABEL)
&& ruleContext.attributes().get("launcher", BuildType.LABEL) != null) {
if (ruleContext.attributes().get("launcher", BuildType.LABEL)
.equals(JavaSemantics.JDK_LAUNCHER_LABEL)) {
return null;
}
return "launcher";
}
// Blaze flag --java_launcher
JavaConfiguration javaConfig = ruleContext.getFragment(JavaConfiguration.class);
if (ruleContext.getRule().isAttrDefined(":java_launcher", BuildType.LABEL)
&& ((javaConfig.getJavaLauncherLabel() != null
&& !javaConfig.getJavaLauncherLabel().equals(JavaSemantics.JDK_LAUNCHER_LABEL))
|| semantics.forceUseJavaLauncherTarget(ruleContext))) {
return ":java_launcher";
}
return null;
}
/**
* Javac options require special processing - People use them and expect the
* options to be tokenized.
*/
public static List<String> tokenizeJavaOptions(Iterable<String> inOpts) {
// Ideally, this would be in the options parser. Unfortunately,
// the options parser can't handle a converter that expands
// from a value X into a List<X> and allow-multiple at the
// same time.
List<String> result = new ArrayList<>();
for (String current : inOpts) {
try {
ShellUtils.tokenize(result, current);
} catch (ShellUtils.TokenizationException ex) {
// Tokenization failed; this likely means that the user
// did not want tokenization to happen on his argument.
// (Any tokenization where we should produce an error
// has already been done by the shell that invoked
// blaze). Therefore, pass the argument through to
// the tool, so that we can see the original error.
result.add(current);
}
}
return result;
}
}
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