dataflow.src.org.checkerframework.dataflow.cfg.node.ThrowNode 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 javax.lang.model.type.TypeKind;
import javax.lang.model.util.Types;

import org.checkerframework.dataflow.util.HashCodeUtils;

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

/**
 * A node for exception throws:
 *
 *  *   throw expr
 * 
 *
 * @author Stefan Heule
 * @author Charlie Garrett
 *
 */
public class ThrowNode extends Node {

    protected ThrowTree tree;
    protected Node expression;

    public ThrowNode(ThrowTree tree,
            Node expression, Types types) {
        super(types.getNoType(TypeKind.NONE));
        this.tree = tree;
        this.expression = expression;
    }

    public Node getExpression() {
        return expression;
    }

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

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

    @Override
    public String toString() {
        return "throw " + expression;
    }

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

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

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