private void loadLanguageMappings(Properties props) {
Enumeration<?> en = props.propertyNames();
while (en.hasMoreElements()) {
String propName = (String) en.nextElement();
String propVal = props.getProperty(propName);
if (propName.startsWith(".")) {
// This is an extension mapping
if (propName.equals(".")) {
// The default mapping
defaultLanguageImplName = propVal;
} else {
propName = propName.substring(1);
extensionMappings.put(propName, propVal);
}
} else {
// value is made up of an optional module name followed by colon followed by the
// FQCN of the factory
int colonIndex = propVal.lastIndexOf(COLON);
String moduleName;
String factoryName;
if (colonIndex != -1) {
moduleName = propVal.substring(0, colonIndex);
factoryName = propVal.substring(colonIndex + 1);
} else {
throw new IllegalArgumentException(
"Language mapping: " + propVal + " does not specify an implementing module");
}
LanguageImplInfo langImpl = new LanguageImplInfo(moduleName, factoryName);
languageImpls.put(propName, langImpl);
extensionMappings.put(propName, propName); // automatically register the name as a mapping
}
}
}
private void loadLanguageMappings() {
// The only language that Vert.x understands out of the box is Java, so we add the default
// runtime and
// extension mapping for that. This can be overridden in langs.properties
languageImpls.put(
"java",
new LanguageImplInfo(null, "org.vertx.java.platform.impl.java.JavaVerticleFactory"));
extensionMappings.put("java", "java");
extensionMappings.put("class", "java");
defaultLanguageImplName = "java";
// First try loading mappings from the LANG_PROPS_FILE_NAMEs file
// This file is structured as follows:
// It should contain one line for every language implementation that is to be used with Vert.x
// That line should be structured as follows:
// <lang_impl_name>=[module_name:]<factory_name>
// Where:
// <lang_impl_name> is the name you want to give to the language implementation, e.g.
// 'jython'
// module_name is the (optional) name of a module that contains the language
// implementation
// if ommitted it will be assumed the language implementation is included as part of the
// Vert.x installation
// - this is only true for the Java implementation
// if included the module_name should be followed by a colon
// factory_name is the FQCN of a VerticleFactory for the language implementation
// Examples:
// rhino=vertx.lang-rhino-v1.0.0:org.vertx.java.platform.impl.rhino.RhinoVerticleFactory
// java=org.vertx.java.platform.impl.java.JavaVerticleFactory
// The file should also contain one line for every extension mapping - this maps a file
// extension to
// a <lang_impl_name> as specified above
// Examples:
// .js=rhino
// .rb=jruby
// The file can also contain a line representing the default language runtime to be used when
// no extension or
// prefix maps, e.g.
// .=java
try (InputStream is = getClass().getClassLoader().getResourceAsStream(LANG_PROPS_FILE_NAME)) {
if (is != null) {
Properties props = new Properties();
props.load(new BufferedInputStream(is));
loadLanguageMappings(props);
}
} catch (IOException e) {
log.error("Failed to load " + LANG_PROPS_FILE_NAME + " " + e.getMessage());
}
// Then override any with system properties
Properties sysProps = new Properties();
Set<String> propertyNames = System.getProperties().stringPropertyNames();
for (String propertyName : propertyNames) {
if (propertyName.startsWith(LANG_IMPLS_SYS_PROP_ROOT)) {
String lang = propertyName.substring(LANG_IMPLS_SYS_PROP_ROOT.length());
String value = System.getProperty(propertyName);
sysProps.put(lang, value);
}
}
loadLanguageMappings(sysProps);
}