dataflow.src.org.checkerframework.dataflow.cfg.node.ConditionalNotNode 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.Collections;

import org.checkerframework.dataflow.util.HashCodeUtils;

import org.checkerframework.javacutil.InternalUtils;

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

/**
 * A node for a conditional not expression:
 *
 *  *   ! expression
 * 
 *
 * @author Stefan Heule
 * @author Charlie Garrett
 *
 */
public class ConditionalNotNode extends Node {

    protected UnaryTree tree;
    protected Node operand;

    public ConditionalNotNode(UnaryTree tree, Node operand) {
        super(InternalUtils.typeOf(tree));
        assert tree.getKind().equals(Kind.LOGICAL_COMPLEMENT);
        this.tree = tree;
        this.operand = operand;
    }

    public Node getOperand() {
        return operand;
    }

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

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

    @Override
    public String toString() {
        return "(!" + getOperand() + ")";
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null || !(obj instanceof ConditionalNotNode)) {
            return false;
        }
        ConditionalNotNode other = (ConditionalNotNode) obj;
        return getOperand().equals(other.getOperand());
    }

    @Override
    public int hashCode() {
        return HashCodeUtils.hash(getOperand());
    }

    @Override
    public Collection getOperands() {
        return Collections.singletonList(getOperand());
    }
}