| package org.checkerframework.dataflow.cfg.node; |
| |
| import com.sun.source.tree.CaseTree; |
| import com.sun.source.tree.Tree.Kind; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Objects; |
| import javax.lang.model.type.TypeKind; |
| import javax.lang.model.util.Types; |
| import org.checkerframework.checker.nullness.qual.Nullable; |
| |
| /** |
| * A node for a case in a switch statement. Although a case has no abstract value, it can imply |
| * facts about the abstract values of its operands. |
| * |
| * <pre> |
| * case <em>constant</em>: |
| * </pre> |
| */ |
| public class CaseNode extends Node { |
| |
| /** The tree for this node. */ |
| protected final CaseTree tree; |
| /** The switch expression. */ |
| protected final Node switchExpr; |
| /** The case expression to match the switch expression against. */ |
| protected final Node caseExpr; |
| |
| /** |
| * Create a new CaseNode. |
| * |
| * @param tree the tree for this node |
| * @param switchExpr the switch expression |
| * @param caseExpr the case expression to match the switch expression against |
| * @param types a factory of utility methods for operating on types |
| */ |
| public CaseNode(CaseTree tree, Node switchExpr, Node caseExpr, Types types) { |
| super(types.getNoType(TypeKind.NONE)); |
| assert tree.getKind() == Kind.CASE; |
| this.tree = tree; |
| this.switchExpr = switchExpr; |
| this.caseExpr = caseExpr; |
| } |
| |
| public Node getSwitchOperand() { |
| return switchExpr; |
| } |
| |
| public Node getCaseOperand() { |
| return caseExpr; |
| } |
| |
| @Override |
| public CaseTree getTree() { |
| return tree; |
| } |
| |
| @Override |
| public <R, P> R accept(NodeVisitor<R, P> visitor, P p) { |
| return visitor.visitCase(this, p); |
| } |
| |
| @Override |
| public String toString() { |
| return "case " + getCaseOperand() + ":"; |
| } |
| |
| @Override |
| public boolean equals(@Nullable Object obj) { |
| if (!(obj instanceof CaseNode)) { |
| return false; |
| } |
| CaseNode other = (CaseNode) obj; |
| return getSwitchOperand().equals(other.getSwitchOperand()) |
| && getCaseOperand().equals(other.getCaseOperand()); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(getSwitchOperand(), getCaseOperand()); |
| } |
| |
| @Override |
| public Collection<Node> getOperands() { |
| return Arrays.asList(getSwitchOperand(), getCaseOperand()); |
| } |
| } |