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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. Copyright (C) 2001 Alan Moore <alan_moore@gmx.net> Copyright (C) 2001-2004 Jan Arne Petersen <jpetersen@uni-bonn.de> Copyright (C) 2002-2004 Anders Bengtsson <ndrsbngtssn@yahoo.se> Copyright (C) 2004 Thomas E Enebo <enebo@acm.org> Copyright (C) 2004 Charles O Nutter <headius@headius.com> Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de> 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;
 

Author(s):
jpetersen
 
 @JRubyClass(name="NilClass")
 public class RubyNil extends RubyObject {
 
     private final int hashCode;
 
     public RubyNil(Ruby runtime) {
         super(runtimeruntime.getNilClass(), false);
          |=  | ;
 
             // default to a fixed value
             this. = 34;
         } else {
             // save the object id based hash code;
             this. = System.identityHashCode(this);
         }
     }
     
     public static final ObjectAllocator NIL_ALLOCATOR = new ObjectAllocator() {
         public IRubyObject allocate(Ruby runtimeRubyClass klass) {
             return runtime.getNil();
         }
     };
     
     public static RubyClass createNilClass(Ruby runtime) {
         RubyClass nilClass = runtime.defineClass("NilClass"runtime.getObject(), );
         runtime.setNilClass(nilClass);
         nilClass.index = .;
         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 .;
     }
 
     @Override
     public boolean isImmediate() {
         return true;
     }
 
     @Override
     public RubyClass getSingletonClass() {
         return ;
     }
    
    @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 contextIRubyObject recv) {
        return RubyFixnum.zero(recv.getRuntime());
    }
    
    
nil_to_f
    @JRubyMethod(name = "to_f")
    public static RubyFloat to_f(ThreadContext contextIRubyObject recv) {
        return RubyFloat.newFloat(context.runtime, 0.0D);
    }
    
    
nil_to_s
    @JRubyMethod(name = "to_s")
    public static RubyString to_s(ThreadContext contextIRubyObject recv) {
        return RubyString.newEmptyString(context.runtime);
    }
    
    
nil_to_a
    @JRubyMethod(name = "to_a")
    public static RubyArray to_a(ThreadContext contextIRubyObject recv) {
        return context.runtime.newEmptyArray();
    }
    
    @JRubyMethod(name = "to_h")
    public static RubyHash to_h(ThreadContext contextIRubyObject 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 = .)
    public static RubyClass type(IRubyObject recv) {
        return recv.getRuntime().getNilClass();
    }
    
    
nil_and
    @JRubyMethod(name = "&", required = 1)
    public static RubyBoolean op_and(IRubyObject recvIRubyObject obj) {
        return recv.getRuntime().getFalse();
    }
    
    
nil_or
    @JRubyMethod(name = "|", required = 1)
    public static RubyBoolean op_or(IRubyObject recvIRubyObject obj) {
        return recv.getRuntime().newBoolean(obj.isTrue());
    }
    
    
nil_xor
    @JRubyMethod(name = "^", required = 1)
    public static RubyBoolean op_xor(IRubyObject recvIRubyObject obj) {
        return recv.getRuntime().newBoolean(obj.isTrue());
    }
    @JRubyMethod(name = "nil?")
    public IRubyObject nil_p() {
        return getRuntime().getTrue();
    }
    @JRubyMethod(name = "hash")
    public RubyFixnum hash(ThreadContext context) {
        return context.runtime.newFixnum(hashCode());
    }
    @Override
    public int hashCode() {
        return ;
    }
    @Override
    public RubyFixnum id() {
        return getRuntime().newFixnum(4);
    }
    
    @Override
    public IRubyObject taint(ThreadContext context) {
        return this;
    }

    
nilclass_to_c
    @JRubyMethod(name = "to_c", compat = .)
    public static IRubyObject to_c(ThreadContext contextIRubyObject recv) {
        return RubyComplex.newComplexCanonicalize(context, RubyFixnum.zero(context.runtime));
    }
    
    
nilclass_to_r
    @JRubyMethod(name = "to_r", compat = .)
    public static IRubyObject to_r(ThreadContext contextIRubyObject recv) {
        return RubyRational.newRationalCanonicalize(context, RubyFixnum.zero(context.runtime));
    }

    
nilclass_rationalize
    @JRubyMethod(name = "rationalize", optional = 1, compat = .)
    public static IRubyObject rationalize(ThreadContext contextIRubyObject recvIRubyObject[] args) {
        return to_r(contextrecv);
    }
    @Override
    public Object toJava(Class target) {
        if (target.isPrimitive()) {
            if (target == .) {
                return .;
            } else if (target == .) {
                return (byte)0;
            } else if (target == .) {
                return (short)0;
            } else if (target == .) {
                return (char)0;
            } else if (target == .) {
                return 0;
            } else if (target == .) {
                return (long)0;
            } else if (target == .) {
                return (float)0;
            } else if (target == .) {
                return (double)0;
            }
        }
        return null;
    }
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