| package org.checkerframework.dataflow.cfg.node; |
| |
| import com.sun.source.tree.Tree; |
| import com.sun.source.tree.Tree.Kind; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Objects; |
| import org.checkerframework.checker.nullness.qual.Nullable; |
| import org.checkerframework.javacutil.TreeUtils; |
| |
| /** |
| * A node for the unary 'nullchk' operation (generated by the Java compiler): |
| * |
| * <pre> |
| * <*nullchk*><em>expression</em> |
| * </pre> |
| */ |
| public class NullChkNode extends Node { |
| |
| protected final Tree tree; |
| protected final Node operand; |
| |
| public NullChkNode(Tree tree, Node operand) { |
| super(TreeUtils.typeOf(tree)); |
| assert tree.getKind() == Kind.OTHER; |
| this.tree = tree; |
| this.operand = operand; |
| } |
| |
| public Node getOperand() { |
| return operand; |
| } |
| |
| @Override |
| public Tree getTree() { |
| return tree; |
| } |
| |
| @Override |
| public <R, P> R accept(NodeVisitor<R, P> visitor, P p) { |
| return visitor.visitNullChk(this, p); |
| } |
| |
| @Override |
| public String toString() { |
| return "(+ " + getOperand() + ")"; |
| } |
| |
| @Override |
| public boolean equals(@Nullable Object obj) { |
| if (!(obj instanceof NumericalPlusNode)) { |
| return false; |
| } |
| NumericalPlusNode other = (NumericalPlusNode) obj; |
| return getOperand().equals(other.getOperand()); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(NullChkNode.class, getOperand()); |
| } |
| |
| @Override |
| public Collection<Node> getOperands() { |
| return Collections.singletonList(getOperand()); |
| } |
| } |