com.google.devtools.build.java.bazel.JavaBuilderConfigGenerator.java Source code

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Here is the source code for com.google.devtools.build.java.bazel.JavaBuilderConfigGenerator.java

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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 com.google.common.base.Joiner;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.rules.java.JavaToolchainData;
import com.google.devtools.build.lib.rules.java.JavaToolchainDataParser;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

/** Utility class to generate {@link JavaBuilderConfig}. */
public class JavaBuilderConfigGenerator {

    private static void die(String message) {
        System.err.println(message);
        System.err.println("\nThis program is expecting the protocol buffer output of a bazel query");
        System.err.println("containing exactly one java_toolchain target. An example of such output");
        System.err.println("can be obtained by:");
        System.err.println(
                "\bazel query --output=proto " + "'kind(java_toolchain, deps(//tools/defaults:java_toolchain))'");
        System.exit(-1);
    }

    public static void main(String[] args) {
        try {
            InputStream stream = System.in;
            if (args.length > 0) {
                stream = new FileInputStream(args[0]);
            }
            ImmutableMap<String, JavaToolchainData> data = JavaToolchainDataParser.parse(stream);
            if (data.size() != 1) {
                die(data.isEmpty() ? "No java_toolchain found!" : "Multiple java_toolchain found!");
            }
            JavaToolchainData first = data.values().asList().get(0);
            String optsString = Joiner.on("\", \"").join(first.getJavacOptions());
            System.out.println("package com.google.devtools.build.java.bazel;");
            System.out.println("public class JavaBuilderJavacOpts {");
            System.out.println("public static final String[] DEFAULT_JAVACOPTS = {\"" + optsString + "\"};");
            System.out.println("}");
        } catch (IOException e) {
            die("Cannot load input file: " + e.getMessage());
        }
    }
}