Examples with Type org.knime.base.node.jsnippet.expression.Type used on opensource projects

Example 1 with Type

use of org.knime.base.node.jsnippet.expression.Type in project knime-core by knime.

the class JavaSnippet method resolveBuildPathForJavaType.

/**
 * Get file and jar urls required for compiling with given java type
 */
private static synchronized Set<File> resolveBuildPathForJavaType(final Class<?> javaType) {
    if (javaType.isPrimitive()) {
        return Collections.emptySet();
    }
    final Set<File> javaTypeCache = CLASSPATH_FOR_CLASS_CACHE.get(javaType);
    if (javaTypeCache != null) {
        return javaTypeCache;
    }
    final Set<File> result = new LinkedHashSet<>();
    final Set<URL> urls = new LinkedHashSet<>();
    ClassUtil.streamForClassHierarchy(javaType).filter(c -> c.getClassLoader() instanceof ModuleClassLoader).flatMap(c -> {
        final ModuleClassLoader moduleClassLoader = (ModuleClassLoader) c.getClassLoader();
        return Arrays.stream(moduleClassLoader.getClasspathManager().getHostClasspathEntries());
    }).forEach(entry -> {
        final BundleFile file = entry.getBundleFile();
        try {
            final URL url = file.getBaseFile().toURI().toURL();
            urls.add(url);
        } catch (MalformedURLException e) {
            LOGGER.error("Could not resolve URL for bundle file \"" + file.toString() + "\" while assembling build path for custom java type \"" + javaType.getName() + "\"");
        }
        result.add(file.getBaseFile());
    });
    /* Check whether the java snippet compiler can later find the class with this classpath */
    try (final URLClassLoader classpathClassLoader = new URLClassLoader(urls.toArray(new URL[urls.size()]))) {
        classpathClassLoader.loadClass(javaType.getName());
    } catch (NoClassDefFoundError | ClassNotFoundException e) {
        LOGGER.error("Classpath for \"" + javaType.getName() + "\" could not be assembled.", e);
        // indicate that this type should not be provided in java snippet
        return null;
    } catch (IOException e) {
        // thrown by URLClassLoader.close()
        LOGGER.error("Unable to close classloader used for testing of custom type classpath.", e);
    }
    if (result.contains(null)) {
        throw new IllegalStateException("Couldn't assemble classpath for custom type \"" + javaType + "\", illegal <null> value in list:\n  " + result.stream().map(f -> f == null ? "<NULL>" : f.getAbsolutePath()).collect(Collectors.joining("\n  ")));
    }
    CLASSPATH_FOR_CLASS_CACHE.put(javaType, result);
    return result;
}