@Override
public OutputStream pipe(String command, PrintStream out, PrintStream err) {
CommandInvocation invocation = javaArgs.parse(command, JAVA_OPTIONS.separatorCode(' '));
Matcher identifierMatcher = lambdaIdentifierRegex.matcher(invocation.getUnprocessedInput());
if (identifierMatcher.matches()) {
String lambdaArgIdentifier = identifierMatcher.group("id");
String lambdaBody = identifierMatcher.group("body").trim();
if (lambdaBody.endsWith(";")) {
lambdaBody = lambdaBody.substring(0, lambdaBody.length() - 1);
}
String lineConsumerCode =
"return (java.util.function.Function<String, ?>)"
+ "(("
+ lambdaArgIdentifier.trim()
+ ") -> "
+ lambdaBody
+ ")";
JavaCode functionCode = new JavaCode(code);
functionCode.addLine(lineConsumerCode);
Optional<Callable<?>> callable =
javacService.compileJavaSnippet(functionCode, classLoaderContext, err);
if (callable.isPresent()) {
try {
Function<String, ?> callback = (Function<String, ?>) callable.get().call();
return new LineOutputStream(
line -> {
@Nullable Object output = callback.apply(line);
if (output != null) {
out.println(output);
}
},
out);
} catch (Exception e) {
err.println(e);
}
}
}
throw new RuntimeException(
"When used in a pipeline, the Java snippet must be in the form of a "
+ "lambda of type Function<String, ?> that takes one text line of the input at a time.\n"
+ "Example: ... | java line -> line.contains(\"text\") ? line : null");
}
@Override
public void execute(String line, PrintStream out, PrintStream err) {
Objects.requireNonNull(classLoaderContext, "Did not set ClassLoaderCapabilities");
CommandInvocation invocation = javaArgs.parse(line, JAVA_OPTIONS.separatorCode(' '));
if (invocation.hasOption(RESET_CODE_ARG)) {
code.resetCode();
}
if (invocation.hasOption(RESET_ALL_ARG)) {
code.resetAll();
}
String codeToRun = invocation.getUnprocessedInput();
@Nullable String className;
if (invocation.hasOption(CLASS_ARG) && (className = extractClassName(codeToRun, err)) != null) {
Optional<Class<Object>> javaClass =
javacService.compileJavaClass(classLoaderContext, className, codeToRun, err);
javaClass.ifPresent(out::println);
} else {
breakupJavaLines(codeToRun);
boolean show = invocation.hasOption(SHOW_ARG);
if (show) {
out.println(javacService.getJavaSnippetClass(code));
if (!codeToRun.isEmpty()) {
// add new lines between the code and its result
out.println();
}
}
// run the current code if some input was given, or in any case when no show option
if (!codeToRun.isEmpty() || !show) {
runJava(out, err);
}
}
}