Java Reflection Constructor Get getConstructorDescriptor(final Constructor c)

Description

Returns the descriptor corresponding to the given constructor.

License

LGPL

Parameter

Parameter	Description
c	a Constructor Constructor object.

Return

the descriptor of the given constructor. (All credit to ObjectWeb ASM)

Declaration

public static String getConstructorDescriptor(final Constructor<?> c) 

Method Source Code

//package com.java2s;
//License from project: LGPL 

import java.lang.reflect.Constructor;

public class Main {
    /**/*from w  ww .  j  a  va2  s  . c  o  m*/
     * Returns the descriptor corresponding to the given constructor.
     * @param c a {@link Constructor Constructor} object.
     * @return the descriptor of the given constructor.
     * (All credit to ObjectWeb ASM)
     * @author Eric Bruneton  
     * @author Chris Nokleberg
     */
    public static String getConstructorDescriptor(final Constructor<?> c) {
        Class<?>[] parameters = c.getParameterTypes();
        StringBuffer buf = new StringBuffer();
        buf.append('(');
        for (int i = 0; i < parameters.length; ++i) {
            getDescriptor(buf, parameters[i]);
        }
        return buf.append(")V").toString();
    }

    /**
     * Appends the descriptor of the given class to the given string buffer.
     * @param buf the string buffer to which the descriptor must be appended.
     * @param c the class whose descriptor must be computed.
     * (All credit to ObjectWeb ASM)
     * @author Eric Bruneton  
     * @author Chris Nokleberg
     */
    private static void getDescriptor(final StringBuffer buf, final Class<?> c) {
        Class<?> d = c;
        while (true) {
            if (d.isPrimitive()) {
                char car;
                if (d == Integer.TYPE) {
                    car = 'I';
                } else if (d == Void.TYPE) {
                    car = 'V';
                } else if (d == Boolean.TYPE) {
                    car = 'Z';
                } else if (d == Byte.TYPE) {
                    car = 'B';
                } else if (d == Character.TYPE) {
                    car = 'C';
                } else if (d == Short.TYPE) {
                    car = 'S';
                } else if (d == Double.TYPE) {
                    car = 'D';
                } else if (d == Float.TYPE) {
                    car = 'F';
                } else /* if (d == Long.TYPE) */ {
                    car = 'J';
                }
                buf.append(car);
                return;
            } else if (d.isArray()) {
                buf.append('[');
                d = d.getComponentType();
            } else {
                buf.append('L');
                String name = d.getName();
                int len = name.length();
                for (int i = 0; i < len; ++i) {
                    char car = name.charAt(i);
                    buf.append(car == '.' ? '/' : car);
                }
                buf.append(';');
                return;
            }
        }
    }
}

Related

1. getConstructor(String string, Class... types)
2. getConstructor(String type, Class[] paramTypes)
3. getConstructor(String typeString)
4. getConstructorAccessor(Class enumClass, Class[] additionalParameterTypes)
5. getConstructorCalls(Class aClass)
6. getConstructorForArguments( java.lang.reflect.Constructor[] constructors, Object... arguments)
7. getConstructorFromSignature(Class clazz, String cstrSig)
8. getConstructorIfAvailable(Class clazz, Class... paramTypes)
9. getConstructorLabel(java.lang.reflect.Constructor con)