dataflow.src.org.checkerframework.dataflow.cfg.node.SignedRightShiftNode Maven / Gradle / Ivy

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The Checker Framework enhances Java’s type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.dataflow.cfg.node;

import java.util.Collection;
import java.util.LinkedList;

import org.checkerframework.dataflow.util.HashCodeUtils;

import org.checkerframework.javacutil.InternalUtils;

import com.sun.source.tree.Tree;
import com.sun.source.tree.Tree.Kind;

/**
 * A node for bitwise right shift operations with sign extension:
 *
 *  *   expression >> expression
 * 
 *
 * @author Stefan Heule
 * @author Charlie Garrett
 *
 */
public class SignedRightShiftNode extends Node {

    protected Tree tree;
    protected Node left;
    protected Node right;

    public SignedRightShiftNode(Tree tree, Node left, Node right) {
        super(InternalUtils.typeOf(tree));
        assert tree.getKind() == Kind.RIGHT_SHIFT;
        this.tree = tree;
        this.left = left;
        this.right = right;
    }

    public Node getLeftOperand() {
        return left;
    }

    public Node getRightOperand() {
        return right;
    }

    @Override
    public Tree getTree() {
        return tree;
    }

    @Override
    public  R accept(NodeVisitor visitor, P p) {
        return visitor.visitSignedRightShift(this, p);
    }

    @Override
    public String toString() {
        return "(" + getLeftOperand() + " >> " + getRightOperand() + ")";
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null || !(obj instanceof SignedRightShiftNode)) {
            return false;
        }
        SignedRightShiftNode other = (SignedRightShiftNode) obj;
        return getLeftOperand().equals(other.getLeftOperand())
                && getRightOperand().equals(other.getRightOperand());
    }

    @Override
    public int hashCode() {
        return HashCodeUtils.hash(getLeftOperand(), getRightOperand());
    }

    @Override
    public Collection getOperands() {
        LinkedList list = new LinkedList();
        list.add(getLeftOperand());
        list.add(getRightOperand());
        return list;
    }
}