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package org.checkerframework.dataflow.cfg.node;
import com.sun.source.tree.CaseTree;
import com.sun.source.tree.Tree.Kind;
import java.util.Collection;
import java.util.LinkedList;
import javax.lang.model.type.TypeKind;
import javax.lang.model.util.Types;
import org.checkerframework.dataflow.util.HashCodeUtils;
/**
* 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>
*
* @author Stefan Heule
* @author Charlie Garrett
*/
public class CaseNode extends Node {
protected CaseTree tree;
protected Node switchExpr;
protected Node caseExpr;
public CaseNode(CaseTree tree, Node switchExpr, Node caseExpr, Types types) {
super(types.getNoType(TypeKind.NONE));
assert tree.getKind().equals(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(Object obj) {
if (obj == null || !(obj instanceof CaseNode)) {
return false;
}
CaseNode other = (CaseNode) obj;
return getSwitchOperand().equals(other.getSwitchOperand())
&& getCaseOperand().equals(other.getCaseOperand());
}
@Override
public int hashCode() {
return HashCodeUtils.hash(getSwitchOperand(), getCaseOperand());
}
@Override
public Collection<Node> getOperands() {
LinkedList<Node> list = new LinkedList<Node>();
list.add(getSwitchOperand());
list.add(getCaseOperand());
return list;
}
}
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