Example usage for java.lang.invoke SerializedLambda getCapturedArg

Introduction

In this page you can find the example usage for java.lang.invoke SerializedLambda getCapturedArg.

Prototype

public Object getCapturedArg(int i) 

Source Link

Document

Get a dynamic argument to the lambda capture site.

Usage

From source file:org.lambdamatic.analyzer.LambdaExpressionAnalyzer.java

/**
 * Returns the {@link SerializedLambdaInfo} for the given {@code expression}
 * //from w  w  w  .  j a  va 2s  .c  om
 * @param expression the expression to analyze.
 * @return the corresponding {@link SerializedLambda}
 * @throws AnalyzeException if something wrong happened (a {@link NoSuchMethodException},
 *         {@link IllegalArgumentException} or {@link InvocationTargetException} exception
 *         occurred).
 * 
 * @see http ://docs.oracle.com/javase/8/docs/api/java/lang/invoke/SerializedLambda.html
 * @see http ://stackoverflow.com/questions/21860875/printing-debug-info-on-errors
 *      -with-java-8-lambda-expressions/21879031 #21879031
 */
private static SerializedLambdaInfo getSerializedLambdaInfo(final Object expression) {
    final Class<?> cl = expression.getClass();
    try {
        final Method m = cl.getDeclaredMethod("writeReplace");
        m.setAccessible(true);
        final Object result = m.invoke(expression);
        if (result instanceof SerializedLambda) {
            final SerializedLambda serializedLambda = (SerializedLambda) result;
            LOGGER.debug(" Lambda FunctionalInterface: {}.{} ({})",
                    serializedLambda.getFunctionalInterfaceClass(),
                    serializedLambda.getFunctionalInterfaceMethodName(),
                    serializedLambda.getFunctionalInterfaceMethodSignature());
            LOGGER.debug(" Lambda Implementation: {}.{} ({})", serializedLambda.getImplClass(),
                    serializedLambda.getImplMethodName(), serializedLambda.getImplMethodSignature());
            IntStream.range(0, serializedLambda.getCapturedArgCount())
                    .forEach(i -> LOGGER.debug("  with Captured Arg(" + i + "): '"
                            + serializedLambda.getCapturedArg(i)
                            + ((serializedLambda.getCapturedArg(i) != null)
                                    ? "' (" + serializedLambda.getCapturedArg(i).getClass().getName() + ")"
                                    : "")));
            return new SerializedLambdaInfo(serializedLambda);
        }
    } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
        throw new AnalyzeException("Failed to find the Serialized form for the given Lambda Expression", e);
    }
    return null;
}

---