/*
 **** BEGIN LICENSE BLOCK *****
 * Version: EPL 2.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * License Version 2.0 (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-v20.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) 2011 Charles O Nutter <headius@headius.com>
 * 
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 * 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"),
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package org.jruby.internal.runtime.methods;

import java.util.Arrays;
import org.jruby.RubyClass;
import org.jruby.RubyModule;
import org.jruby.runtime.ivars.VariableAccessor;
import org.jruby.internal.runtime.methods.JavaMethod.JavaMethodZero;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.Visibility;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.runtime.ivars.MethodData;

A method type for attribute writers (as created by attr_writer or attr_accessor).
/**
 * A method type for attribute writers (as created by attr_writer or attr_accessor).
 */
public class AttrReaderMethod extends JavaMethodZero {
    private MethodData methodData;
    private VariableAccessor accessor = VariableAccessor.DUMMY_ACCESSOR;

    public AttrReaderMethod(RubyModule implementationClass, Visibility visibility, String variableName) {
        super(implementationClass, visibility, variableName);
    }

    public IRubyObject call(ThreadContext context, IRubyObject self, RubyModule clazz, String name) {
        IRubyObject variable = (IRubyObject) verifyAccessor(self.getMetaClass().getRealClass()).get(self);
        return variable == null ? context.nil : variable;
    }
    
    public String getVariableName() {
        return name;
    }

    private VariableAccessor verifyAccessor(RubyClass cls) {
        VariableAccessor localAccessor = accessor;
        if (localAccessor.getClassId() != cls.id) {
            localAccessor = cls.getVariableAccessorForRead(name);
            accessor = localAccessor;
        }
        return localAccessor;
    }
    
    @Override
    public MethodData getMethodData() {
        if (methodData == null){
            methodData = new MethodData(name, "dummyfile", Arrays.asList(name));
        }
        return methodData;
    }

    // Used by racc extension, needed for backward-compat with 1.7.
    @Deprecated
    public AttrReaderMethod(RubyModule implementationClass, Visibility visibility, CallConfiguration callConfiguration, String variableName) {
        this(implementationClass, visibility, variableName);
    }
}