/*
 * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.oracle.truffle.sl.nodes.access;

import java.util.*;

import com.oracle.truffle.api.frame.*;
import com.oracle.truffle.api.nodes.*;
import com.oracle.truffle.api.source.*;
import com.oracle.truffle.sl.*;
import com.oracle.truffle.sl.nodes.*;

/**
 * The node for accessing a property of an object. When executed, this node first evaluates the
 * object expression on the left side of the dot operator and then reads the named property.
 */
@NodeInfo(shortName = ".")
public final class SLReadPropertyNode extends SLExpressionNode {

    public static SLReadPropertyNode create(SourceSection src, SLExpressionNode receiverNode, String propertyName) {
        return new SLReadPropertyNode(src, receiverNode, propertyName);
    }

    @Child protected SLExpressionNode receiverNode;
    protected final String propertyName;

    private SLReadPropertyNode(SourceSection src, SLExpressionNode receiverNode, String propertyName) {
        super(src);
        this.receiverNode = receiverNode;
        this.propertyName = propertyName;
    }

    @Override
    public Object executeGeneric(VirtualFrame frame) {
        Object object = receiverNode.executeGeneric(frame);
        if (object instanceof Map) {
            return ((Map<?, ?>) object).get(propertyName);
        } else {
            throw new SLException("unexpected receiver type");
        }
    }
}