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/*
 ***** BEGIN LICENSE BLOCK *****
 * Version: CPL 1.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Common 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/cpl-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 Benoit Cerrina 
 * Copyright (C) 2002 Jan Arne Petersen 
 * Copyright (C) 2002-2004 Anders Bengtsson 
 * Copyright (C) 2004 Thomas E Enebo 
 * Copyright (C) 2004 Stefan Matthias Aust 
 * 
 * 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 CPL, 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 CPL, the GPL or the LGPL.
 ***** END LICENSE BLOCK *****/
package org.jruby.ast;

import java.util.List;

import org.jruby.Ruby;
import org.jruby.RubyClass;
import org.jruby.RubyClass.VariableAccessor;
import org.jruby.ast.types.INameNode;
import org.jruby.ast.visitor.NodeVisitor;
import org.jruby.lexer.yacc.ISourcePosition;
import org.jruby.runtime.Block;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;

/** 
 * Represents an instance variable assignment.
 */
public class InstAsgnNode extends AssignableNode implements INameNode {
    private String name;
    private VariableAccessor accessor = VariableAccessor.DUMMY_ACCESSOR;

    /**
     * @param name the name of the instance variable
     * @param valueNode the value of the variable
     **/
    public InstAsgnNode(ISourcePosition position, String name, Node valueNode) {
        super(position, valueNode);
        
        this.name = name;
    }

    public NodeType getNodeType() {
        return NodeType.INSTASGNNODE;
    }
    
    /**
     * Accept for the visitor pattern.
     * @param iVisitor the visitor
     **/
    public Object accept(NodeVisitor iVisitor) {
        return iVisitor.visitInstAsgnNode(this);
    }

    /**
     * Gets the name.
     * @return Returns a String
     */
    public String getName() {
        return name;
    }
    
    public List childNodes() {
        return createList(getValueNode());
    }

    public void setName(String name) {
        this.name = name;
    }
    
    @Override
    public IRubyObject interpret(Ruby runtime, ThreadContext context, IRubyObject self, Block aBlock) {
        RubyClass cls = self.getMetaClass().getRealClass();
        IRubyObject value = getValueNode().interpret(runtime, context, self, aBlock);
        verifyAccessor(cls).set(self, value);   
        return value;
    }
    
    @Override
    public IRubyObject assign(Ruby runtime, ThreadContext context, IRubyObject self, IRubyObject value, Block block, boolean checkArity) {
        RubyClass cls = self.getMetaClass().getRealClass();
        verifyAccessor(cls).set(self, value);                
        return runtime.getNil();
    }

    private VariableAccessor verifyAccessor(RubyClass cls) {
        VariableAccessor localAccessor = accessor;
        if (localAccessor.getClassId() != cls.hashCode()) {
            localAccessor = cls.getVariableAccessorForWrite(name);
            accessor = localAccessor;
        }
        return localAccessor;
    }
}