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package org.checkerframework.dataflow.cfg.node;
import com.sun.source.tree.IdentifierTree;
import com.sun.source.tree.Tree;
import com.sun.source.tree.VariableTree;
import java.util.Collection;
import java.util.Collections;
import javax.lang.model.element.Element;
import org.checkerframework.dataflow.util.HashCodeUtils;
import org.checkerframework.javacutil.InternalUtils;
import org.checkerframework.javacutil.TreeUtils;
/**
* A node for a local variable or a parameter:
*
* <pre>
* <em>identifier</em>
* </pre>
*
* We allow local variable uses introduced by the {@link
* org.checkerframework.dataflow.cfg.CFGBuilder} without corresponding AST {@link Tree}s.
*
* @author Stefan Heule
*/
// TODO: don't use for parameters, as they don't have a tree
public class LocalVariableNode extends Node {
protected Tree tree;
protected Node receiver;
public LocalVariableNode(Tree t) {
super(InternalUtils.typeOf(t));
// IdentifierTree for normal uses of the local variable or parameter,
// and VariableTree for the translation of an initializer block
assert t != null;
assert t instanceof IdentifierTree || t instanceof VariableTree;
tree = t;
this.receiver = null;
}
public LocalVariableNode(Tree t, Node receiver) {
this(t);
this.receiver = receiver;
}
public Element getElement() {
Element el;
if (tree instanceof IdentifierTree) {
el = TreeUtils.elementFromUse((IdentifierTree) tree);
} else {
assert tree instanceof VariableTree;
el = TreeUtils.elementFromDeclaration((VariableTree) tree);
}
return el;
}
public Node getReceiver() {
return receiver;
}
public String getName() {
if (tree instanceof IdentifierTree) {
return ((IdentifierTree) tree).getName().toString();
}
return ((VariableTree) tree).getName().toString();
}
@Override
public Tree getTree() {
return tree;
}
@Override
public <R, P> R accept(NodeVisitor<R, P> visitor, P p) {
return visitor.visitLocalVariable(this, p);
}
@Override
public String toString() {
return getName().toString();
}
@Override
public boolean equals(Object obj) {
if (obj == null || !(obj instanceof LocalVariableNode)) {
return false;
}
LocalVariableNode other = (LocalVariableNode) obj;
return getName().equals(other.getName());
}
@Override
public int hashCode() {
return HashCodeUtils.hash(getName());
}
@Override
public Collection<Node> getOperands() {
return Collections.emptyList();
}
}
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