jruby/src/org/jruby/RubyNil.java at parallel_boot · MSNexploder/jruby · GitHub

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/***** BEGIN LICENSE BLOCK *****

* Version: EPL 1.0/GPL 2.0/LGPL 2.1

* The contents of this file are subject to the Eclipse Public

* License Version 1.0 (the "License"); you may not use this file

* except in compliance with the License. You may obtain a copy of

* the License at http://www.eclipse.org/legal/epl-v10.html

* Software distributed under the License is distributed on an "AS

* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or

* implied. See the License for the specific language governing

* rights and limitations under the License.

* Alternatively, the contents of this file may be used under the terms of

* either of the GNU General Public License Version 2 or later (the "GPL"),

* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),

* in which case the provisions of the GPL or the LGPL are applicable instead

* of those above. If you wish to allow use of your version of this file only

* under the terms of either the GPL or the LGPL, and not to allow others to

* use your version of this file under the terms of the EPL, indicate your

* decision by deleting the provisions above and replace them with the notice

* and other provisions required by the GPL or the LGPL. If you do not delete

* the provisions above, a recipient may use your version of this file under

* the terms of any one of the EPL, the GPL or the LGPL.

***** END LICENSE BLOCK *****/

package org.jruby;

import org.jruby.anno.JRubyMethod;

import org.jruby.anno.JRubyClass;

import org.jruby.runtime.ClassIndex;

import org.jruby.runtime.ObjectAllocator;

import org.jruby.runtime.ThreadContext;

import org.jruby.runtime.builtin.IRubyObject;

/**

* @author jpetersen

@JRubyClass(name="NilClass")

public class RubyNil extends RubyObject {

public RubyNil(Ruby runtime) {

super(runtime, runtime.getNilClass(), false);

flags |= NIL_F | FALSE_F;

}

public static final ObjectAllocator NIL_ALLOCATOR = new ObjectAllocator() {

public IRubyObject allocate(Ruby runtime, RubyClass klass) {

return runtime.getNil();

}

};

public static RubyClass createNilClass(Ruby runtime) {

RubyClass nilClass = runtime.defineClass("NilClass", runtime.getObject(), NIL_ALLOCATOR);

runtime.setNilClass(nilClass);

nilClass.index = ClassIndex.NIL;

nilClass.setReifiedClass(RubyNil.class);

nilClass.defineAnnotatedMethods(RubyNil.class);

nilClass.getMetaClass().undefineMethod("new");

// FIXME: This is causing a verification error for some reason

//nilClass.dispatcher = callbackFactory.createDispatcher(nilClass);

return nilClass;

}

@Override

public int getNativeTypeIndex() {

return ClassIndex.NIL;

}

@Override

public boolean isImmediate() {

return true;

}

@Override

public RubyClass getSingletonClass() {

return metaClass;

}

@Override

public Class<?> getJavaClass() {

return void.class;

}

// Methods of the Nil Class (nil_*):

/** nil_to_i

@JRubyMethod(name = "to_i")

public static RubyFixnum to_i(ThreadContext context, IRubyObject recv) {

return RubyFixnum.zero(recv.getRuntime());

}

/**

* nil_to_f

@JRubyMethod(name = "to_f")

public static RubyFloat to_f(ThreadContext context, IRubyObject recv) {

return RubyFloat.newFloat(context.runtime, 0.0D);

}

/** nil_to_s

@JRubyMethod(name = "to_s")

public static RubyString to_s(ThreadContext context, IRubyObject recv) {

return RubyString.newEmptyString(context.runtime);

}

/** nil_to_a

@JRubyMethod(name = "to_a")

public static RubyArray to_a(ThreadContext context, IRubyObject recv) {

return context.runtime.newEmptyArray();

}

@JRubyMethod(name = "to_h")

public static RubyHash to_h(ThreadContext context, IRubyObject recv) {

return RubyHash.newSmallHash(context.runtime);

}

/** nil_inspect

@JRubyMethod(name = "inspect")

public static RubyString inspect(IRubyObject recv) {

Ruby runtime = recv.getRuntime();

if (runtime.is1_9()) {

return RubyString.newUSASCIIString(runtime, "nil");

} else {

return RubyString.newString(runtime, "nil");

}

/** nil_type

@JRubyMethod(name = "type", compat = CompatVersion.RUBY1_8)

public static RubyClass type(IRubyObject recv) {

return recv.getRuntime().getNilClass();

}

/** nil_and

@JRubyMethod(name = "&", required = 1)

public static RubyBoolean op_and(IRubyObject recv, IRubyObject obj) {

return recv.getRuntime().getFalse();

}

/** nil_or

@JRubyMethod(name = "|", required = 1)

public static RubyBoolean op_or(IRubyObject recv, IRubyObject obj) {

return recv.getRuntime().newBoolean(obj.isTrue());

}

/** nil_xor

@JRubyMethod(name = "^", required = 1)

public static RubyBoolean op_xor(IRubyObject recv, IRubyObject obj) {

return recv.getRuntime().newBoolean(obj.isTrue());

}

@JRubyMethod(name = "nil?")

public IRubyObject nil_p() {

return getRuntime().getTrue();

}

@Override

public RubyFixnum id() {

return getRuntime().newFixnum(4);

}

@Override

public IRubyObject taint(ThreadContext context) {

return this;

}

/** nilclass_to_c

@JRubyMethod(name = "to_c", compat = CompatVersion.RUBY1_9)

public static IRubyObject to_c(ThreadContext context, IRubyObject recv) {

return RubyComplex.newComplexCanonicalize(context, RubyFixnum.zero(context.runtime));

}

/** nilclass_to_r

@JRubyMethod(name = "to_r", compat = CompatVersion.RUBY1_9)

public static IRubyObject to_r(ThreadContext context, IRubyObject recv) {

return RubyRational.newRationalCanonicalize(context, RubyFixnum.zero(context.runtime));

}

/** nilclass_rationalize

@JRubyMethod(name = "rationalize", optional = 1, compat = CompatVersion.RUBY1_9)

public static IRubyObject rationalize(ThreadContext context, IRubyObject recv, IRubyObject[] args) {

return to_r(context, recv);

}

@Override

public Object toJava(Class target) {

if (target.isPrimitive()) {

if (target == Boolean.TYPE) {

return Boolean.FALSE;

} else if (target == Byte.TYPE) {

return (byte)0;

} else if (target == Short.TYPE) {

return (short)0;

} else if (target == Character.TYPE) {

return (char)0;

} else if (target == Integer.TYPE) {

return 0;

} else if (target == Long.TYPE) {

return (long)0;

} else if (target == Float.TYPE) {

return (float)0;

} else if (target == Double.TYPE) {

return (double)0;

}

return null;

}

jruby/src/org/jruby/RubyNil.java at parallel_boot · MSNexploder/jruby · GitHub

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