org.ng200.openolympus.cerberus.compilers.JavaCompiler.java Source code

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Here is the source code for org.ng200.openolympus.cerberus.compilers.JavaCompiler.java

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/**
 * The MIT License
 * Copyright (c) 2014-2015 Nick Guletskii
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.ng200.openolympus.cerberus.compilers;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.nio.file.Path;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;
import java.util.stream.Collectors;

import org.apache.commons.exec.CommandLine;
import org.apache.commons.exec.DefaultExecutor;
import org.apache.commons.exec.ExecuteWatchdog;
import org.apache.commons.exec.PumpStreamHandler;
import org.ng200.openolympus.FileAccess;
import org.ng200.openolympus.cerberus.exceptions.CompilationException;
import org.ng200.openolympus.cerberus.exceptions.CompilerError;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class JavaCompiler implements Compiler {
    private static final Logger logger = LoggerFactory.getLogger(JavaCompiler.class);
    private List<String> arguments = new ArrayList<>();

    public JavaCompiler() {
    }

    @Override
    public void addArgument(final String argument) {
        this.arguments.add(argument);
    }

    public List<String> getArguments() {
        return arguments;
    }

    public void setArguments(List<String> arguments) {
        this.arguments = arguments;
    }

    @Override
    public void compile(final List<Path> inputFiles, final Path outputFile,
            final Map<String, Object> additionalParameters) throws CompilationException, IOException {

        FileAccess.createDirectories(outputFile);

        final CommandLine commandLine = new CommandLine("javac");
        commandLine.setSubstitutionMap(additionalParameters);

        this.arguments.forEach((arg) -> commandLine.addArgument(arg));

        commandLine.addArgument("-d");
        commandLine.addArgument(outputFile.toAbsolutePath().toString());

        commandLine.addArgument("-nowarn"); // Prohibit warnings because they
        // screw
        // up error detection

        inputFiles.forEach((file) -> commandLine
                .addArguments(MessageFormat.format("\"{0}\"", file.toAbsolutePath().toString()))); // Add
        // input
        // files

        JavaCompiler.logger.info("Running javac with arguments: {}", Arrays.asList(commandLine.getArguments()));

        final DefaultExecutor executor = new DefaultExecutor();
        executor.setExitValues(new int[] { 0, 1 });

        final ByteArrayOutputStream errorStream = new ByteArrayOutputStream();
        executor.setStreamHandler(new PumpStreamHandler(null, errorStream, null));

        executor.setWatchdog(new ExecuteWatchdog(20000));// 20 seconds to
        // compile
        int result;
        try {
            result = executor.execute(commandLine);
        } catch (final IOException e) {
            JavaCompiler.logger.error("Could not execute javac: {}", e);
            throw new CompilationException("Could not execute javac", e);
        }

        switch (result) {
        case 0:
            return;
        case 1:
            try {
                String errorString = errorStream.toString("UTF-8");
                final Pattern pattern = Pattern.compile(
                        "^(" + inputFiles.stream().map(file -> Pattern.quote(file.toAbsolutePath().toString()))
                                .collect(Collectors.joining("|")) + "):",
                        Pattern.MULTILINE);
                errorString = pattern.matcher(errorString).replaceAll("");

                JavaCompiler.logger.debug("Compilation error: {}", errorString);

                throw new CompilerError("javac.wrote.stderr", errorString);
            } catch (final UnsupportedEncodingException e) {
                throw new CompilationException("Unsupported encoding! The compiler should output UTF-8!", e);
            }
        }
    }
}