https://github.com/jruby/jruby/jruby-core: JRuby is the effort to recreate the Ruby (https://www.ruby-lang.org) interpreter in Java. (JRuby)
  • headius
  • enebo
  • wmeissner
  • BanzaiMan
  • mkristian 
BEGIN LICENSE BLOCK *****
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package org.jruby.javasupport.ext;

import org.jruby.*;
import org.jruby.anno.JRubyClass;
import org.jruby.anno.JRubyMethod;
import org.jruby.runtime.Helpers;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;

import java.lang.reflect.InvocationTargetException;

import static org.jruby.javasupport.JavaUtil.convertArguments;
import static org.jruby.javasupport.JavaUtil.convertJavaToUsableRubyObject;
import static org.jruby.javasupport.JavaUtil.unwrapJavaObject;


Java::JavaLangReflect package extensions.

Author:kares
/**
 * Java::JavaLangReflect package extensions.
 *
 * @author kares
 */
public abstract class JavaLangReflect {

    public static void define(final Ruby runtime) {
        JavaExtensions.put(runtime, java.lang.reflect.Constructor.class, (proxyClass) -> Constructor.define(runtime, (RubyClass) proxyClass));
        JavaExtensions.put(runtime, java.lang.reflect.Field.class, (proxyClass) -> Field.define(runtime, (RubyClass) proxyClass));
        JavaExtensions.put(runtime, java.lang.reflect.Method.class, (proxyClass) -> Method.define(runtime, (RubyClass) proxyClass));
    }

    @JRubyClass(name = "Java::JavaLangReflect::Constructor")
    public static class Constructor {

        static RubyClass define(final Ruby runtime, final RubyClass proxy) {
            proxy.defineAnnotatedMethods(Constructor.class);
            return proxy;
        }

        @JRubyMethod
        public static IRubyObject return_type(final ThreadContext context, final IRubyObject self) {
            return context.nil;
        }

        @JRubyMethod // alias argument_types parameter_types
        public static IRubyObject argument_types(final ThreadContext context, final IRubyObject self) {
            final java.lang.reflect.Constructor thiz = unwrapJavaObject(self);
            return convertJavaToUsableRubyObject(context.runtime, thiz.getParameterTypes());
        }

        //

        @JRubyMethod
        public static IRubyObject inspect(final ThreadContext context, final IRubyObject self) {
            final java.lang.reflect.AccessibleObject thiz = unwrapJavaObject(self);
            return RubyString.newString(context.runtime, thiz.toString());
        }

        // JavaUtilities::ModifiedShortcuts :

        @JRubyMethod(name = "public?")
        public static IRubyObject public_p(final IRubyObject self) {
            final java.lang.reflect.Constructor thiz = unwrapJavaObject(self);
            return isPublic(self, thiz.getModifiers());
        }

        @JRubyMethod(name = "protected?")
        public static IRubyObject protected_p(final IRubyObject self) {
            final java.lang.reflect.Constructor thiz = unwrapJavaObject(self);
            return isProtected(self, thiz.getModifiers());
        }

        @JRubyMethod(name = "private?")
        public static IRubyObject private_p(final IRubyObject self) {
            final java.lang.reflect.Constructor thiz = unwrapJavaObject(self);
            return isPrivate(self, thiz.getModifiers());
        }

        @JRubyMethod(name = "final?")
        public static IRubyObject final_p(final IRubyObject self) {
            final java.lang.reflect.Constructor thiz = unwrapJavaObject(self);
            return isFinal(self, thiz.getModifiers());
        }

        @JRubyMethod(name = "static?")
        public static IRubyObject static_p(final IRubyObject self) {
            final java.lang.reflect.Constructor thiz = unwrapJavaObject(self);
            return isStatic(self, thiz.getModifiers());
        }

    }

    @JRubyClass(name = "Java::JavaLangReflect::Method")
    public static class Method {

        static RubyClass define(final Ruby runtime, final RubyClass proxy) {
            proxy.defineAnnotatedMethods(Method.class);
            return proxy;
        }

        @JRubyMethod
        public static IRubyObject return_type(final ThreadContext context, final IRubyObject self) {
            final java.lang.reflect.Method thiz = unwrapJavaObject(self);
            return convertJavaToUsableRubyObject(context.runtime, thiz.getReturnType());
        }

        @JRubyMethod // alias argument_types parameter_types
        public static IRubyObject argument_types(final ThreadContext context, final IRubyObject self) {
            final java.lang.reflect.Method thiz = unwrapJavaObject(self);
            return convertJavaToUsableRubyObject(context.runtime, thiz.getParameterTypes());
        }

        @JRubyMethod(rest = true)
        public static IRubyObject invoke_static(final ThreadContext context, final IRubyObject self, final IRubyObject[] args) {
            final java.lang.reflect.Method thiz = unwrapJavaObject(self);
            final Object[] javaArgs = convertArguments(args, thiz.getParameterTypes());
            try {
                return convertJavaToUsableRubyObject(context.runtime, thiz.invoke(null, javaArgs));
            }
            catch (IllegalAccessException|InvocationTargetException e) {
                Helpers.throwException(e); return null;
            }
        }

        //

        @JRubyMethod
        public static IRubyObject inspect(final ThreadContext context, final IRubyObject self) {
            final java.lang.reflect.AccessibleObject thiz = unwrapJavaObject(self);
            return RubyString.newString(context.runtime, thiz.toString());
        }

        @JRubyMethod(name = "abstract?")
        public static IRubyObject abstract_p(final IRubyObject self) {
            final java.lang.reflect.Field thiz = unwrapJavaObject(self);
            return isAbstract(self, thiz.getModifiers());
        }

        // JavaUtilities::ModifiedShortcuts :

        @JRubyMethod(name = "public?")
        public static IRubyObject public_p(final IRubyObject self) {
            final java.lang.reflect.Method thiz = unwrapJavaObject(self);
            return isPublic(self, thiz.getModifiers());
        }

        @JRubyMethod(name = "protected?")
        public static IRubyObject protected_p(final IRubyObject self) {
            final java.lang.reflect.Method thiz = unwrapJavaObject(self);
            return isProtected(self, thiz.getModifiers());
        }

        @JRubyMethod(name = "private?")
        public static IRubyObject private_p(final IRubyObject self) {
            final java.lang.reflect.Method thiz = unwrapJavaObject(self);
            return isPrivate(self, thiz.getModifiers());
        }

        @JRubyMethod(name = "final?")
        public static IRubyObject final_p(final IRubyObject self) {
            final java.lang.reflect.Method thiz = unwrapJavaObject(self);
            return isFinal(self, thiz.getModifiers());
        }

        @JRubyMethod(name = "static?")
        public static IRubyObject static_p(final IRubyObject self) {
            final java.lang.reflect.Method thiz = unwrapJavaObject(self);
            return isStatic(self, thiz.getModifiers());
        }

    }

    @JRubyClass(name = "Java::JavaLangReflect::Field")
    public static class Field {

        static RubyClass define(final Ruby runtime, final RubyClass proxy) {
            proxy.defineAnnotatedMethods(Field.class);
            return proxy;
        }

        @JRubyMethod // alias value_type name
        public static IRubyObject value_type(final ThreadContext context, final IRubyObject self) {
            final java.lang.reflect.Field field = unwrapJavaObject(self);
            return convertJavaToUsableRubyObject(context.runtime, field.getName());
        }

        @JRubyMethod // alias value get
        public static IRubyObject value(final ThreadContext context, final IRubyObject self, final IRubyObject obj) {
            final java.lang.reflect.Field field = unwrapJavaObject(self);
            try {
                return convertJavaToUsableRubyObject(context.runtime, field.get(unwrapJavaObject(obj)));
            }
            catch (IllegalAccessException e) {
                Helpers.throwException(e); return null;
            }
        }

        @JRubyMethod // alias set_value set
        public static IRubyObject set_value(final ThreadContext context, final IRubyObject self, final IRubyObject obj,
            final IRubyObject value) {
            final java.lang.reflect.Field field = unwrapJavaObject(self);
            try {
                final Object val = value.toJava(field.getType());
                field.set(unwrapJavaObject(obj), val);
            }
            catch (IllegalAccessException e) {
                Helpers.throwException(e); return null;
            }
            return context.nil;
        }

        @JRubyMethod
        public static IRubyObject static_value(final ThreadContext context, final IRubyObject self) {
            final java.lang.reflect.Field field = unwrapJavaObject(self);
            try {
                return convertJavaToUsableRubyObject(context.runtime, field.get(null));
            }
            catch (IllegalAccessException e) {
                Helpers.throwException(e); return null;
            }
        }

        @JRubyMethod
        public static IRubyObject set_static_value(final ThreadContext context, final IRubyObject self, final IRubyObject value) {
            final java.lang.reflect.Field field = unwrapJavaObject(self);
            try {
                final Object val = value.toJava(field.getType());
                field.set(null, val);
            }
            catch (IllegalAccessException e) {
                Helpers.throwException(e); return null;
            }
            return context.nil;
        }

        //

        @JRubyMethod
        public static IRubyObject inspect(final ThreadContext context, final IRubyObject self) {
            final java.lang.reflect.AccessibleObject thiz = unwrapJavaObject(self);
            return RubyString.newString(context.runtime, thiz.toString());
        }

        // JavaUtilities::ModifiedShortcuts :

        @JRubyMethod(name = "public?")
        public static IRubyObject public_p(final IRubyObject self) {
            final java.lang.reflect.Field thiz = unwrapJavaObject(self);
            return isPublic(self, thiz.getModifiers());
        }

        @JRubyMethod(name = "protected?")
        public static IRubyObject protected_p(final IRubyObject self) {
            final java.lang.reflect.Field thiz = unwrapJavaObject(self);
            return isProtected(self, thiz.getModifiers());
        }

        @JRubyMethod(name = "private?")
        public static IRubyObject private_p(final IRubyObject self) {
            final java.lang.reflect.Field thiz = unwrapJavaObject(self);
            return isPrivate(self, thiz.getModifiers());
        }

        @JRubyMethod(name = "final?")
        public static IRubyObject final_p(final IRubyObject self) {
            final java.lang.reflect.Field thiz = unwrapJavaObject(self);
            return isFinal(self, thiz.getModifiers());
        }

        @JRubyMethod(name = "static?")
        public static IRubyObject static_p(final IRubyObject self) {
            final java.lang.reflect.Field thiz = unwrapJavaObject(self);
            return isStatic(self, thiz.getModifiers());
        }

    }

    static RubyBoolean isAbstract(final IRubyObject self, final int mod) {
        return self.getRuntime().newBoolean(java.lang.reflect.Modifier.isAbstract(mod));
    }

    static RubyBoolean isPublic(final IRubyObject self, final int mod) {
        return self.getRuntime().newBoolean(java.lang.reflect.Modifier.isPublic(mod));
    }

    static RubyBoolean isProtected(final IRubyObject self, final int mod) {
        return self.getRuntime().newBoolean(java.lang.reflect.Modifier.isProtected(mod));
    }

    static RubyBoolean isPrivate(final IRubyObject self, final int mod) {
        return self.getRuntime().newBoolean(java.lang.reflect.Modifier.isPrivate(mod));
    }

    static RubyBoolean isFinal(final IRubyObject self, final int mod) {
        return self.getRuntime().newBoolean(java.lang.reflect.Modifier.isFinal(mod));
    }

    static RubyBoolean isStatic(final IRubyObject self, final int mod) {
        return self.getRuntime().newBoolean(java.lang.reflect.Modifier.isStatic(mod));
    }

}