org.renjin.gcc.maven.GccBridgeHelper.java Source code

Introduction

Here is the source code for org.renjin.gcc.maven.GccBridgeHelper.java

Source

/**
 * Renjin : JVM-based interpreter for the R language for the statistical analysis
 * Copyright  2010-2016 BeDataDriven Groep B.V. and contributors
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, a copy is available at
 * https://www.gnu.org/licenses/gpl-2.0.txt
 */
package org.renjin.gcc.maven;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.logging.Log;
import org.apache.maven.project.MavenProject;
import org.apache.maven.project.artifact.AttachedArtifact;
import org.renjin.repackaged.guava.collect.Lists;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.nio.file.Files;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;
import java.util.jar.JarOutputStream;

/**
 *
 */
public class GccBridgeHelper {

    private MavenProject project;

    public static void archiveHeaders(Log log, MavenProject project, File... includeDirectories)
            throws MojoExecutionException {

        File outputDir = new File(project.getBuild().getDirectory());
        File archiveFile = new File(outputDir, project.getBuild().getFinalName() + "-headers.jar");

        ensureDirExists(outputDir);

        try (JarOutputStream output = new JarOutputStream(new FileOutputStream(archiveFile))) {
            for (File includeDirectory : includeDirectories) {
                if (includeDirectory.exists()) {
                    log.info("Archiving headers from " + includeDirectory.getAbsolutePath());
                    archiveFiles(output, includeDirectory, "");
                }
            }
        } catch (IOException e) {
            throw new MojoExecutionException("Failed to create headers archive", e);
        }

        Artifact artifact = new AttachedArtifact(project.getArtifact(), "jar", "headers",
                new HeaderArtifactHandler());
        artifact.setFile(archiveFile);
        artifact.setResolved(true);

        project.addAttachedArtifact(artifact);
    }

    private static void archiveFiles(JarOutputStream output, File dir, String prefix) throws IOException {
        File[] includeFiles = dir.listFiles();
        if (includeFiles != null) {
            for (File includeFile : includeFiles) {
                if (includeFile.isDirectory()) {
                    archiveFiles(output, includeFile, prefix + includeFile.getName() + "/");
                } else {
                    JarEntry entry = new JarEntry(prefix + includeFile.getName());
                    output.putNextEntry(entry);
                    Files.copy(includeFile.toPath(), output);
                }
            }
        }
    }

    public static void unpackHeaders(Log log, File dir, List<Artifact> artifacts) throws MojoExecutionException {
        ensureDirExists(dir);

        for (Artifact compileArtifact : artifacts) {
            if ("headers".equals(compileArtifact.getClassifier())) {
                extractHeaders(log, compileArtifact, dir);
            }
        }
    }

    public static void extractHeaders(Log log, Artifact artifact, File unpackedIncludeDir)
            throws MojoExecutionException {
        if (artifact.getFile() == null) {
            throw new MojoExecutionException("Depedency " + artifact.getId() + " has not been resolved.");
        }
        try (JarInputStream in = new JarInputStream(new FileInputStream(artifact.getFile()))) {
            JarEntry entry;
            while ((entry = in.getNextJarEntry()) != null) {
                if (!entry.isDirectory()) {
                    File destFile = new File(unpackedIncludeDir + File.separator + entry.getName());

                    log.debug("Unpacking " + entry.getName() + " to " + destFile);

                    ensureDirExists(destFile.getParentFile());
                    org.renjin.repackaged.guava.io.Files.asByteSink(destFile).writeFrom(in);
                }
            }
        } catch (IOException e) {
            throw new MojoExecutionException("Exception unpacking headers", e);
        }
    }

    public static void ensureDirExists(File unpackDir) throws MojoExecutionException {
        if (!unpackDir.exists()) {
            boolean created = unpackDir.mkdirs();
            if (!created) {
                throw new MojoExecutionException(
                        "Failed to create include directory " + unpackDir.getAbsolutePath());
            }
        }
    }

    public static ClassLoader getLinkClassLoader(MavenProject project, Log log) throws MojoExecutionException {
        try {
            log.debug("GCC-Bridge Link Classpath: ");

            List<URL> classpathURLs = Lists.newArrayList();
            classpathURLs.add(new File(project.getBuild().getOutputDirectory()).toURI().toURL());

            for (Artifact artifact : (List<Artifact>) project.getCompileArtifacts()) {
                log.debug("  " + artifact.getFile());

                classpathURLs.add(artifact.getFile().toURI().toURL());
            }

            ClassLoader parent = GccBridgeHelper.class.getClassLoader();

            return new URLClassLoader(classpathURLs.toArray(new URL[classpathURLs.size()]), parent);

        } catch (MalformedURLException e) {
            throw new MojoExecutionException("Exception resolving classpath", e);
        }
    }
}