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 * Copyright (c) 2010, 2013, 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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,
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 *
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package jdk.nashorn.internal.ir;

import jdk.nashorn.internal.ir.annotations.Immutable;

/**
 * IR base for accessing/indexing nodes.
 *
 * @see AccessNode
 * @see IndexNode
 */
@Immutable
public abstract class BaseNode extends Expression implements FunctionCall {

    /** Base Node. */
    protected final Expression base;

    private final boolean isFunction;

    /**
     * Constructor
     *
     * @param token  token
     * @param finish finish
     * @param base   base node
     * @param isFunction is this a function
     */
    public BaseNode(final long token, final int finish, final Expression base, final boolean isFunction) {
        super(token, base.getStart(), finish);
        this.base            = base;
        this.isFunction      = isFunction;
    }

    /**
     * Copy constructor for immutable nodes
     * @param baseNode node to inherit from
     * @param base base
     * @param isFunction is this a function
     */
    protected BaseNode(final BaseNode baseNode, final Expression base, final boolean isFunction) {
        super(baseNode);
        this.base            = base;
        this.isFunction      = isFunction;
    }

    /**
     * Get the base node for this access
     * @return the base node
     */
    public Expression getBase() {
        return base;
    }

    @Override
    public boolean isFunction() {
        return isFunction;
    }

    /**
     * Mark this node as being the callee operand of a {@link CallNode}.
     * @return a base node identical to this one in all aspects except with its function flag set.
     */
    public abstract BaseNode setIsFunction();

}