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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) 2002-2004 Anders Bengtsson <ndrsbngtssn@yahoo.se> Copyright (C) 2002-2004 Jan Arne Petersen <jpetersen@uni-bonn.de> Copyright (C) 2004 Thomas E Enebo <enebo@acm.org> Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de> Copyright (C) 2005 Charles O Nutter <headius@headius.com> 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.internal.runtime;
 
 import java.util.Map;
 import java.util.Set;
 
 import org.jruby.Ruby;

Author(s):
jpetersen
 
 public class GlobalVariables {
     private Ruby runtime;
     
     public GlobalVariables(Ruby runtime) {
         this. = runtime;
     }
 
     public void define(String nameIAccessor accessorGlobalVariable.Scope scope) {
         assert name != null;
         assert accessor != null;
         assert name.startsWith("$");
 
         .put(namenew GlobalVariable(accessorscope));
     }
     
     public void defineReadonly(String nameIAccessor accessorGlobalVariable.Scope scope) {
         assert name != null;
         assert accessor != null;
         assert name.startsWith("$");
 
         .put(namenew GlobalVariable(new ReadonlyAccessor(nameaccessor), scope));
     }
 
     public boolean isDefined(String name) {
         assert name != null;
         assert name.startsWith("$");
         
         GlobalVariable variable = (GlobalVariable).get(name);
         return variable != null && !(variable.getAccessor() instanceof UndefinedAccessor);
     }

    
Creates a new global variable which links to the oldName global variable. WANRING we are already using the 1.7.1 behaviour.
 
     public void alias(String nameString oldName) {
         assert name != null;
         assert oldName != null;
         assert name.startsWith("$");
         assert oldName.startsWith("$");
 
         GlobalVariable oldVariable = createIfNotDefined(oldName);
         GlobalVariable variable = (GlobalVariable).get(name);
 
         if (variable != null && oldVariable != variable && variable.isTracing()) {
             throw new RaiseException(.getRuntimeError(), "can't alias in tracer"false);
         }
 
         .put(nameoldVariable);
    }
    public IRubyObject get(String name) {
	    assert name != null;
	    assert name.startsWith("$");
	    GlobalVariable variable = (GlobalVariable).get(name);
	    if (variable != nullreturn variable.getAccessor().getValue();
	    if (.isVerbose()) {
	        .getWarnings().warning(."global variable `" + name + "' not initialized");
	    }
		return .getNil();
	}
    
    public GlobalVariable getVariable(String name) {
	    assert name != null;
	    assert name.startsWith("$");
	    GlobalVariable variable = (GlobalVariable).get(name);
        if (variable != nullreturn variable;
        
        return createIfNotDefined(name);
    }
    public IRubyObject set(String nameIRubyObject value) {
        assert name != null;
        assert name.startsWith("$");
        GlobalVariable variable = createIfNotDefined(name);
        IRubyObject result = variable.getAccessor().setValue(value);
        variable.trace(value);
        variable.invalidate();
        return result;
    }
    public IRubyObject clear(String name) {
        return set(name.getNil());
    }
    public void setTraceVar(String nameRubyProc proc) {
        assert name != null;
        assert name.startsWith("$");
        
        GlobalVariable variable = createIfNotDefined(name);
        variable.addTrace(proc);
    }
    
    public boolean untraceVar(String nameIRubyObject command) {
        assert name != null;
        assert name.startsWith("$");
        
        if (isDefined(name)) {
            GlobalVariable variable = (GlobalVariable).get(name);
            return variable.removeTrace(command);
        }
        return false;
    }
    
    public void untraceVar(String name) {
        assert name != null;
        assert name.startsWith("$");
        
        if (isDefined(name)) {
            GlobalVariable variable = (GlobalVariable).get(name);
            variable.removeTraces();
        }
    }
    public Set<StringgetNames() {
        return .keySet();
    }
    private GlobalVariable createIfNotDefined(String name) {
        GlobalVariable variable = (GlobalVariable).get(name);
        if (variable == null) {
            variable = GlobalVariable.newUndefined(name);
            .put(namevariable);
        }
        return variable;
    }
    private IRubyObject defaultSeparator;
    public IRubyObject getDefaultSeparator() {
        return ;
    }
    public void setDefaultSeparator(IRubyObject defaultSeparator) {
        this. = defaultSeparator;    
    }
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