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package org.checkerframework.dataflow.cfg.node;
/*>>>
import org.checkerframework.checker.nullness.qual.Nullable;
*/
import com.sun.source.tree.Tree;
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;
/**
* MarkerNodes are no-op Nodes used for debugging information. They can hold a Tree and a message,
* which will be part of the String representation of the MarkerNode.
*
* <p>An example use case for MarkerNodes is representing switch statements.
*
* @author Stefan Heule
* @author Charlie Garrett
*/
public class MarkerNode extends Node {
protected /*@Nullable*/ Tree tree;
protected String message;
public MarkerNode(/*@Nullable*/ Tree tree, String message, Types types) {
super(types.getNoType(TypeKind.NONE));
this.tree = tree;
this.message = message;
}
public String getMessage() {
return message;
}
@Override
public Tree getTree() {
return tree;
}
@Override
public <R, P> R accept(NodeVisitor<R, P> visitor, P p) {
return visitor.visitMarker(this, p);
}
@Override
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append("marker ");
sb.append("(" + message + ")");
return sb.toString();
}
@Override
public boolean equals(Object obj) {
if (obj == null || !(obj instanceof MarkerNode)) {
return false;
}
MarkerNode other = (MarkerNode) obj;
if (tree == null && other.getTree() != null) {
return false;
}
return getTree().equals(other.getTree()) && getMessage().equals(other.getMessage());
}
@Override
public int hashCode() {
int hash = 0;
if (tree != null) {
hash = HashCodeUtils.hash(tree);
}
return HashCodeUtils.hash(hash, getMessage());
}
@Override
public Collection<Node> getOperands() {
return Collections.emptyList();
}
}
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