SCStmt.java

/* This file is part of the db4o object database http://www.db4o.com

Copyright (C) 2004 - 2011  Versant Corporation http://www.versant.com

db4o is free software; you can redistribute it and/or modify it under
the terms of version 3 of the GNU General Public License as published
by the Free Software Foundation.

db4o 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
for more details.

You should have received a copy of the GNU General Public License along
with this program.  If not, see http://www.gnu.org/licenses/. */
package EDU.purdue.cs.bloat.tree;

/**
 * SCStmt represents a swizzle check on an element in an array.
 */
public class SCStmt extends Stmt {

	Expr array;

	Expr index;

	boolean redundant;

	/**
	 * Constructor.
	 * 
	 * @param a
	 *            The array on which to place the swizzle check.
	 * @param i
	 *            The element in array a to swizzle.
	 */
	public SCStmt(final Expr a, final Expr i) {
		this.array = a;
		this.index = i;
		this.redundant = false;
		array.setParent(this);
		index.setParent(this);
	}

	public Expr array() {
		return array;
	}

	public Expr index() {
		return index;
	}

	/**
	 * @return True, if the swizzle check is redundent.
	 */
	public boolean redundant() {
		return redundant;
	}

	public void set_redundant(final boolean val) {
		this.redundant = val;
	}

	public void visit(final TreeVisitor visitor) {
		visitor.visitSCStmt(this);
	}

	public Object clone() {
		return copyInto(new SCStmt((Expr) array.clone(), (Expr) index.clone()));
	}

	public void visitForceChildren(final TreeVisitor visitor) {
		if (visitor.reverse()) {
			index.visit(visitor);
			array.visit(visitor);
		} else {
			array.visit(visitor);
			index.visit(visitor);
		}
	}

}