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package org.checkerframework.dataflow.cfg.node;
import java.util.Collection;
import java.util.Collections;
import javax.lang.model.element.VariableElement;
import org.checkerframework.dataflow.util.HashCodeUtils;
import org.checkerframework.javacutil.ElementUtils;
import org.checkerframework.javacutil.InternalUtils;
import org.checkerframework.javacutil.TreeUtils;
import com.sun.source.tree.IdentifierTree;
import com.sun.source.tree.MemberSelectTree;
import com.sun.source.tree.Tree;
/**
* A node for a field access, including a method accesses:
*
* <pre>
* <em>expression</em> . <em>field</em>
* </pre>
*
* @author Stefan Heule
*
*/
public class FieldAccessNode extends Node {
protected Tree tree;
protected VariableElement element;
protected String field;
protected Node receiver;
// TODO: add method to get modifiers (static, access level, ..)
public FieldAccessNode(Tree tree, Node receiver) {
super(InternalUtils.typeOf(tree));
assert TreeUtils.isFieldAccess(tree);
this.tree = tree;
this.receiver = receiver;
this.field = TreeUtils.getFieldName(tree);
if (tree instanceof MemberSelectTree) {
this.element = (VariableElement) TreeUtils.elementFromUse((MemberSelectTree) tree);
} else {
assert tree instanceof IdentifierTree;
this.element = (VariableElement) TreeUtils.elementFromUse((IdentifierTree) tree);
}
}
public FieldAccessNode(Tree tree, VariableElement element, Node receiver) {
super(element.asType());
this.tree = tree;
this.element = element;
this.receiver = receiver;
this.field = element.getSimpleName().toString();
}
public VariableElement getElement() {
return element;
}
public Node getReceiver() {
return receiver;
}
public String getFieldName() {
return field;
}
@Override
public Tree getTree() {
return tree;
}
@Override
public <R, P> R accept(NodeVisitor<R, P> visitor, P p) {
return visitor.visitFieldAccess(this, p);
}
@Override
public String toString() {
return getReceiver() + "." + field;
}
/**
* Is this a static field?
*/
public boolean isStatic() {
return ElementUtils.isStatic(getElement());
}
@Override
public boolean equals(Object obj) {
if (obj == null || !(obj instanceof FieldAccessNode)) {
return false;
}
FieldAccessNode other = (FieldAccessNode) obj;
return getReceiver().equals(other.getReceiver())
&& getFieldName().equals(other.getFieldName());
}
@Override
public int hashCode() {
return HashCodeUtils.hash(getReceiver(), getFieldName());
}
@Override
public Collection<Node> getOperands() {
return Collections.singletonList(receiver);
}
}
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